Article: 102535 of rec.radio.amateur.boatanchors From: "Craig" Subject: extra cooling for SB-230 Date: Sun, 25 Jun 2006 04:15:08 -0400 Message-ID: <550c2$449e4608$4831d174$7067@FUSE.NET> Hello, I recently acquired an old Heathkit SB-230 at a local hamfest and in the interest of keeping that old (and EXPENSIVE!) tube alive for as long as possible would like to add a bit of extra cooling. Would resting a muffin fan on top of the cabinet be preferable to blowing air across the heatsink? Also, if on the housing, would sucking the air out of the cabinet be superior to blowing in? (I'm assuming the former as this is what works best with my computer). I might even do both....plenty of muffin fans lauing about not pulling their weight! hi hi Craig KB8FGC Article: 102536 of rec.radio.amateur.boatanchors Date: Sun, 25 Jun 2006 20:19:11 +1000 From: Lionel Sharp Subject: Re: Help Please to identify this old ex WD "Receiver" References: <1150914118.701837.235300@i40g2000cwc.googlegroups.com> <1151225280.056729.97000@p79g2000cwp.googlegroups.com> Message-ID: <449e631d$0$22360$afc38c87@news.optusnet.com.au> Might be a radar receiver of some sort with those 6 IF stages. Should be able to check them out with a grid dip oscillator to see what frequency they are on. 30MHZ??? My data books shows the VR136 equivalents as a CV1136 or CV380. Civilian equivalents are the EF54 or RL7 which are a sharp cut off pentode used as a UHF Amplifier. Base is European 9 pin lock-in type. 73 Lionel VK4NS ron_ayling wrote: > Hi Chris > My mistake the other valve is a VR136 not VR138 the unit is a bit > tarnished, strange that transmitting valve is there? I can't believe > its a transmitter, or transmits in any way, there is no change over and > the controls and connections are real simplicity, it looks like a > straightforward simple HF receiver? Anyway thanks for the info, I guess > by the lack of replies its an unusual one :( > cheers > from Ron... > > > Chris Suslowicz wrote: > >>"ron_ayling" wrote: >> >> >>>Hi, I've recently purchased what looks like an old Ex WD unit, with no >>>identity plates, and I'd really like to identify it, I'm sure its a >>>receiver though it could be a converter of some description, quite >>>large front panel 280 by 170mm 300mm deep, centre left of the front >>>panel are three controls marked Aerial RF and Oscillator, each having a >>>little window that clicks round 0 to 9, to the right is a paxolin >>>panel with test points marked V1 to V10, bottom of panel sockets left >>>to right marked RF input, Output, Power Input, Gain control, inside the >>>three front panel controls connect to what looks like a front end box >>>which held two valves marked VR138 and VR137, there are then six IF >>>cans with a single coil inside and six valve holders alongside marked >>>VR65... >> >>With those valves, it's ex-RAF, probably late WW2 to 1950s vintage. >> >>VR137 is an EC52 low power VHF transmitting triode on B9G base. >>VR138 is unlisted in anything I have to hand, unfortunately. >>VR65 is an SP61 pentode (100MHz max frequency) on Maxda Octal base. >> >>The EC52 is capable of 7 watts and 300MHz, so it's a transceiver >>or transponder of some sort, I'd guess. (Possibly IFF?) >> >>Hope this is some help, >> >>Chris. > > Article: 102537 of rec.radio.amateur.boatanchors From: chris+news@suslowicz.org (Chris Suslowicz) Subject: Re: Help Please to identify this old ex WD "Receiver" Date: Sun, 25 Jun 2006 12:37:28 +0100 Message-ID: References: <1150914118.701837.235300@i40g2000cwc.googlegroups.com> <1151225280.056729.97000@p79g2000cwp.googlegroups.com> In article <1151225280.056729.97000@p79g2000cwp.googlegroups.com>, "ron_ayling" wrote: >Hi Chris >My mistake the other valve is a VR136 not VR138 the unit is a bit >tarnished, strange that transmitting valve is there? I can't believe >its a transmitter, or transmits in any way, there is no change over and >the controls and connections are real simplicity, it looks like a >straightforward simple HF receiver? Anyway thanks for the info, I guess >by the lack of replies its an unusual one :( VR136 is another B9G base, and is an EF54, again with a maximum operating frequency of 300MHz. I'll have to dig out my Yeeha! password and have a look at the photo. One thought: if it's steel-cased it's probably ground based kit, as most of the airborne stuff was aluminium to save weight. Chris. -- If Usenet did not exist, nobody in their right mind would invent it. Article: 102538 of rec.radio.amateur.boatanchors From: "Brian Hill" Subject: FS SP-600 parts Message-ID: <0axng.11$3d.4@fe03.lga> Date: Sun, 25 Jun 2006 09:34:35 -0500 I have a bunch of SP-600 parts for sale. Email me your needs -- Regards B.H. Souther, MN USA Radios- R-5000, NRD525,SP-600,SX-28,Eton E1 Brian's Radio Universe http://webpages.charter.net/brianhill/500.htm Remove your HAT to reply directly brianehillHAT@charter.net Article: 102539 of rec.radio.amateur.boatanchors From: "Brian Reay" Subject: B2 spy set o n Ebay Message-ID: Date: Sun, 25 Jun 2006 15:23:09 GMT http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6638912642&ru=http%3A%2F%2Fsearch.ebay.co.uk%3A80%2Fsearch%2Fsearch.dll%3Ffrom%3DR40%26satitle%3D6638912642%26fvi%3D1 Seems VERY under bid and from a silent key sale. Seems wrong the widow should be ripped off when it goes for only £1000 -- 73 Brian, G8OSN www.g8osn.org.uk Article: 102540 of rec.radio.amateur.boatanchors From: " Ron in Radio Heaven" References: Subject: Re: B2 spy set o n Ebay Message-ID: Date: Sun, 25 Jun 2006 15:39:23 GMT > > Seems VERY under bid and from a silent key sale. Seems wrong the widow > should be ripped off when it goes for only £1000 > I don't see how you could think the widow is being "ripped off". It's an auction and will sell for the highest bid. If they wanted more they should have shopped it around and tried to find someone that would premium for it instead of putting it up for auction. 73, Ron -- Radio Collection Web Page, http://www.radioheaven.homestead.com WANTED! http://radioheaven.homestead.com/grknob.html Hard to find 2 pin mic connectors for BA rigs. http://radioheaven.homestead.com/2pinmicplug.html Article: 102541 of rec.radio.amateur.boatanchors From: "Brian Hill" References: Subject: Re: B2 spy set o n Ebay Message-ID: Date: Sun, 25 Jun 2006 10:50:06 -0500 " Ron in Radio Heaven" wrote in message news:L6yng.9222$R26.1247@tornado.southeast.rr.com... > >> >> Seems VERY under bid and from a silent key sale. Seems wrong the widow >> should be ripped off when it goes for only £1000 >> > > I don't see how you could think the widow is being "ripped off". > It's an auction and will sell for the highest bid. > If they wanted more they should have shopped it around and tried > to find someone that would premium for it instead of putting it > up for auction. > > > 73, Ron > > -- > > Radio Collection Web Page, > http://www.radioheaven.homestead.com > WANTED! > http://radioheaven.homestead.com/grknob.html > Hard to find 2 pin mic connectors for BA rigs. > http://radioheaven.homestead.com/2pinmicplug.html > > > He posted this on the 19th too. -- Regards B.H. Souther, MN USA Radios- R-5000, NRD525,SP-600,SX-28,Eton E1 Brian's Radio Universe http://webpages.charter.net/brianhill/500.htm Brian's Basement http://webpages.charter.net/brianhill/6.htm Remove your HAT to reply directly brianehillHAT@charter.net Article: 102542 of rec.radio.amateur.boatanchors From: "Theo" References: <1151250264.516413.162020@c74g2000cwc.googlegroups.com> Subject: Re: B2 spy set o n Ebay Message-ID: <0lyng.9604$SO4.2869@newsfe3-win.ntli.net> Date: Sun, 25 Jun 2006 15:54:36 GMT Delightful_little_lady? Looks more like a bulldog sucking a wasp! Article: 102543 of rec.radio.amateur.boatanchors From: "Ron Toller" References: <550c2$449e4608$4831d174$7067@FUSE.NET> Subject: Re: extra cooling for SB-230 Message-ID: Date: Sun, 25 Jun 2006 15:55:15 GMT Don't use this amp in a contest, even with a muffing fan, I could smell the wax oozing from the power transformer. Switched to a SB-220. Good durable amp if proper care is taken. N4US "Craig" wrote in message news:550c2$449e4608$4831d174$7067@FUSE.NET... > Hello, I recently acquired an old Heathkit SB-230 at a local hamfest and > in the interest of keeping that old (and EXPENSIVE!) tube alive for as > long as possible would like to add a bit of extra cooling. Would resting > a muffin fan on top of the cabinet be preferable to blowing air across the > heatsink? Also, if on the housing, would sucking the air out of the > cabinet be superior to blowing in? (I'm assuming the former as this is > what works best with my computer). I might even do both....plenty of > muffin fans lauing about not pulling their weight! hi hi > Craig KB8FGC > > > Article: 102544 of rec.radio.amateur.boatanchors From: "Lurker" Subject: Re: B2 spy set o n Ebay Date: Sun, 25 Jun 2006 17:10:28 +0100 Message-ID: References: " Ron in Radio Heaven" wrote in message news:L6yng.9222$R26.1247@tornado.southeast.rr.com... > >> >> Seems VERY under bid and from a silent key sale. Seems wrong the widow >> should be ripped off when it goes for only £1000 >> > > I don't see how you could think the widow is being "ripped off". > It's an auction and will sell for the highest bid. > If they wanted more they should have shopped it around and tried > to find someone that would premium for it instead of putting it > up for auction. > Closed auction, one bid and underbid. Looks like someone is trying to do the dirty on the family to me............I bet the widow doesn't know the true value. Article: 102545 of rec.radio.amateur.boatanchors From: "Ken Ward" References: Subject: Re: B2 spy set o n Ebay Message-ID: Date: Sun, 25 Jun 2006 16:22:37 GMT "Brian Reay" wrote in message news:xTxng.9104$SO4.5804@newsfe3-win.ntli.net... > http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6638912642&ru=http%3A%2F%2Fsearch.ebay.co.uk%3A80%2Fsearch%2Fsearch.dll%3Ffrom%3DR40%26satitle%3D6638912642%26fvi%3D1 > > Seems VERY under bid and from a silent key sale. Seems wrong the widow > should be ripped off when it goes for only £1000 How can anyone be "Ripped Off" if it reaches the reserve price? If it is worth more, then it should be sold elsewhere. KW Article: 102546 of rec.radio.amateur.boatanchors From: "We Are Devo!" Subject: Re: B2 spy set o n Ebay References: Message-ID: Date: 25 Jun 2006 17:21:37 GMT On 25/06/2006 at 16:23:09 M3OSN Brian Reay wrote: > Seems VERY under bid and from a silent key sale. Seems wrong the > widow should be ripped off when it goes for only £1000 Can you _prove_ that? -- "The computer can't tell you the emotional story. It can give you the exact mathematical design, but what's missing is the eyebrows." - Frank Zappa Article: 102547 of rec.radio.amateur.boatanchors From: "Jim Barnard" Subject: Hallicrafters SX-101A Restoration Question Date: Sun, 25 Jun 2006 14:13:56 -0400 Message-ID: I am in the processing of restoring a Hallicrafters SX-101A model MKIIIA. The big black dial bezel on this radio has a smooth flat black finish. I all the pictures that I have examined on the Internet, the bezel has a black wrinkled finish. In disassembling the bezel from the front panel, it looks like this was original because none of green painted on "screw seals" appeared disturbed. Is this correct for this model or has someone done a masterful refinishing job at some point in the past? Thanks for any suggestions/comments. Jim Article: 102548 of rec.radio.amateur.boatanchors From: Steve Subject: Re: B2 spy set o n Ebay References: Message-ID: Date: Sun, 25 Jun 2006 18:49:55 GMT Brian Reay wrote: > > Seems VERY under bid and from a silent key sale. Seems wrong the widow > should be ripped off when it goes for only £1000 > Well, I have no idea what these things are worth. So Brian, maybe you could give me an idea? £1k seems a lot of money in any case, unless they are really that collectable. Why didn't you put in a higher bid and either enjoy it or sell it on? Steve Article: 102549 of rec.radio.amateur.boatanchors From: "Jim Barnard" Subject: Re: Hallicrafters SX-101A Restoration Question Date: Sun, 25 Jun 2006 15:09:50 -0400 Message-ID: References: Sorry, the Hallicrafters is the model SX-101 MK3, not a SX-101A Jim "Jim Barnard" wrote in message news:e7mjp1$p74$1@news04.infoave.net... >I am in the processing of restoring a Hallicrafters SX-101A model MKIIIA. > > The big black dial bezel on this radio has a smooth flat black finish. I > all the pictures that I have examined on the Internet, the bezel has a > black wrinkled finish. In disassembling the bezel from the front panel, it > looks like this was original because none of green painted on "screw > seals" appeared disturbed. > > Is this correct for this model or has someone done a masterful refinishing > job at some point in the past? > > Thanks for any suggestions/comments. > > Jim > Article: 102550 of rec.radio.amateur.boatanchors From: chris+news@suslowicz.org (Chris Suslowicz) Subject: Re: Help Please to identify this old ex WD "Receiver" Date: Sun, 25 Jun 2006 20:38:47 +0100 Message-ID: References: <1150914118.701837.235300@i40g2000cwc.googlegroups.com> <1151225280.056729.97000@p79g2000cwp.googlegroups.com> <1151257102.646928.136570@b68g2000cwa.googlegroups.com> In article <1151257102.646928.136570@b68g2000cwa.googlegroups.com>, "ron_ayling" wrote: >Hi Chris >Thats a good point! its very heavy all steel construction so as you say >probably Land based, I have tried to GDO the front end coils, and get a >good dip on the RF and Osc coils around 38 mhz, The antenna coil I >can't find a dip although the coils look very similar in all three >stages, So what would a fairly high gain fairly fixed freq receiver be >doing on a military airfield during WW2 with a VR138 in it? Radar receiver? The early stuff worked in the 20 - 50 MHz range, and they might have used a fairly chunky valve as the RF input stage to protect things from the substantial transmit pulses. Alternatively it may just be the LO because it was a convenient triode that would work at the desired frequencies (and the VR136 is the RF preamp). >By the way I noticed there is also a valve diode base in the front end >similar to an EA50 type I would think and another at the end of the IF >chain AVC and detector? Dual AVC? If the IF strip is single coil, it's probably wideband for pulse use... another clue to radar applications! Best, Chris. -- "With its diet of keycaps, mouse-balls and Ethernet terminators, the Aardvax can be a potentially serious pest in computer installations" -- Tanuki in a.s.r Article: 102551 of rec.radio.amateur.boatanchors From: chris+news@suslowicz.org (Chris Suslowicz) Subject: Re: extra cooling for SB-230 Date: Sun, 25 Jun 2006 20:38:46 +0100 Message-ID: References: <550c2$449e4608$4831d174$7067@FUSE.NET> In article , "Ron Toller" wrote: >Don't use this amp in a contest, even with a muffing fan, To quote Dean A. Grennell: "That sounds vaguely obscene, and if there's one thing I can't stand, it's vagueness" g,d&rlh. Chris. -- "With its diet of keycaps, mouse-balls and Ethernet terminators, the Aardvax can be a potentially serious pest in computer installations" -- Tanuki in a.s.r Article: 102552 of rec.radio.amateur.boatanchors From: "Jean Darley G1DLL" References: Subject: Re: B2 spy set o n Ebay Message-ID: Date: Sun, 25 Jun 2006 22:14:11 GMT "Brian Reay" wrote in message news:xTxng.9104$SO4.5804@newsfe3-win.ntli.net... > http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6638912642&ru=http%3A%2F%2Fsearch.ebay.co.uk%3A80%2Fsearch%2Fsearch.dll%3Ffrom%3DR40%26satitle%3D6638912642%26fvi%3D1 > > Seems VERY under bid and from a silent key sale. Seems wrong the widow > should be ripped off when it goes for only £1000 > > -- > 73 > Brian, G8OSN > www.g8osn.org.uk > Facts about the Spy set auction on Ebay for a Silent Key sale by Delightful_Little_Lady who set up the auction. All the radio kit from the silent key was purchased by The Bredhurst Receiving and Transmitting Society (BRATS) of which I am a member out of club funds for £500.00 to immediately allow the family to pay for expences that were due. The BRATS were to be paid back their £500.00 and any profit that the members made above £500.00 by selling the equipment would be paid to the family. If this figure was not achieved The BRATS did not expect their money back. The BRATS were given 2 agendas by the family of the silent key. One was to sell the equipment to raise enough money to at least pay for his funeral. The couple were so distraught that my husband arranged the cheapest funeral he could for them. The second agenda was a plea from the family to get rid of the large amount of equipment from their premises AS SOON AS POSSIBLE. We are talking one garage load and one large room of equipment that had been collected by the amateur over 40 odd years. Quite a task in anyone's books. The Radio Club (The Bredhurst Radio & Transmitting Society), of which I and my husband are members appointed my husband Charles G4VSZ to take over the advertisements of the equipment to 9 local Radio Clubs in the area. This he did by setting up a Website to offer the equipment that was the most valuable. The B2 was the most valuable piece of equipment belonging to the silent key. This was offered on the website and anyone could have telephoned us on our number, which is in the telephone book, emailed him to offer a firm bid on this item. NO ONE came forward from any of the clubs we contacted with a bid. However, quite a few people said put it on Ebay. I reluctantly offered to put it under my Ebay name as I have over 1000 positive feedbacks. I say reluctantly because it meant a lot of work for me and as usual people were coming up with plenty of suggestions but no solutions. Charles and I also said that if it did not sell we would put our money where our mouth is and give £1,000.00 for the set. I was then able to start the auction at £1,000.00. I made the auction a private auction to stop timewasters putting in bids in the last minutes and then not paying. I had 8 people who asked to join my bidders list and of those 3 made bids. The radio has now sold for £1,776 to a London bidder who I will keep anonymous as per the auction description. I am paying the fees of this sale on Ebay myself. The family can more than pay for the funeral and are delighted and overwhelmed by what the Bredhurst Receiving & Transmitting Society (BRATS) have done for them. If, like usual, there is no comment from the perpetrator of this thread when faced with the truth about something. I will take it that my Ebay name has been vindicated on this newsgroup. Sorry is not a word in his vocabulary so he usually goes silent instead. If, however, he is attention seeking again, and in his usual mood for twisting the truth to suit himself, I can assure this will be my only posting on the subject, as none of my family want anything to do with this man, especially giving him fuel for his massive ego. Jean Darley G1DLL Delightful_Little_Lady on Ebay. Article: 102553 of rec.radio.amateur.boatanchors From: Gizmo Subject: Heathkit SB-1000 amplifier kit. Unbuilt. Message-ID: Date: Sun, 25 Jun 2006 23:03:18 GMT I have acquired a Heathkit SB-1000 amplifier unbuilt kit. Before I decide to build it or sell it, would like to find out what it would be worth in an unbuilt state. The main box had been opened and the manual removed for reading., the other inner boxes have not been opened or anything else removed. It also came with the QSK kit which was an option from Heathkit (it was factory assmebled). Please contact me off list.Thanks for reading. ..............dennis ve6ac Article: 102554 of rec.radio.amateur.boatanchors From: "mikeFNB" References: Subject: Re: B2 spy set o n Ebay Message-ID: Date: Sun, 25 Jun 2006 23:59:12 GMT on behalf of everyone on this newsgroup may i apologise for the actions certain persons i hope everyone will join me in saying thankyou on behalf of the radio community a job well done and one that should be commended it is sad you had to waste your time to justify yourself here mike g7bnf "Jean Darley G1DLL" wrote in message news:TUDng.480198$tc.272933@fe2.news.blueyonder.co.uk... > > "Brian Reay" wrote in message > news:xTxng.9104$SO4.5804@newsfe3-win.ntli.net... >> http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6638912642&ru=http%3A%2F%2Fsearch.ebay.co.uk%3A80%2Fsearch%2Fsearch.dll%3Ffrom%3DR40%26satitle%3D6638912642%26fvi%3D1 >> >> Seems VERY under bid and from a silent key sale. Seems wrong the widow >> should be ripped off when it goes for only £1000 >> >> -- >> 73 >> Brian, G8OSN >> www.g8osn.org.uk >> > Facts about the Spy set auction on Ebay for a Silent Key sale by > Delightful_Little_Lady who set up the auction. > > > > All the radio kit from the silent key was purchased by The Bredhurst > Receiving and Transmitting Society (BRATS) of which I am a member out of > club funds for £500.00 to immediately allow the family to pay for expences > that were due. The BRATS were to be paid back their £500.00 and any profit > that the members made above £500.00 by selling the equipment would be paid > to the family. If this figure was not achieved The BRATS did not expect > their money back. > > > > The BRATS were given 2 agendas by the family of the silent key. > > One was to sell the equipment to raise enough money to at least pay for > his funeral. The couple were so distraught that my husband arranged the > cheapest funeral he could for them. > > The second agenda was a plea from the family to get rid of the large > amount of equipment from their premises AS SOON AS POSSIBLE. We are > talking one garage load and one large room of equipment that had been > collected by the amateur over 40 odd years. Quite a task in anyone's > books. > > > > The Radio Club (The Bredhurst Radio & Transmitting Society), of which I > and my husband are members appointed my husband Charles G4VSZ to take over > the advertisements of the equipment to 9 local Radio Clubs in the area. > This he did by setting up a Website to offer the equipment that was the > most valuable. The B2 was the most valuable piece of equipment belonging > to the silent key. This was offered on the website and anyone could have > telephoned us on our number, which is in the telephone book, emailed him > to offer a firm bid on this item. NO ONE came forward from any of the > clubs we contacted with a bid. However, quite a few people said put it on > Ebay. > > > > I reluctantly offered to put it under my Ebay name as I have over 1000 > positive feedbacks. I say reluctantly because it meant a lot of work for > me and as usual people were coming up with plenty of suggestions but no > solutions. Charles and I also said that if it did not sell we would put > our money where our mouth is and give £1,000.00 for the set. I was then > able to start the auction at £1,000.00. > > > > I made the auction a private auction to stop timewasters putting in bids > in the last minutes and then not paying. I had 8 people who asked to join > my bidders list and of those 3 made bids. The radio has now sold for > £1,776 to a London bidder who I will keep anonymous as per the auction > description. I am paying the fees of this sale on Ebay myself. > > > > The family can more than pay for the funeral and are delighted and > overwhelmed by what the Bredhurst Receiving & Transmitting Society (BRATS) > have done for them. > > > > If, like usual, there is no comment from the perpetrator of this thread > when faced with the truth about something. I will take it that my Ebay > name has been vindicated on this newsgroup. Sorry is not a word in his > vocabulary so he usually goes silent instead. If, however, he is attention > seeking again, and in his usual mood for twisting the truth to suit > himself, I can assure this will be my only posting on the subject, as none > of my family want anything to do with this man, especially giving him fuel > for his massive ego. Jean Darley G1DLL Delightful_Little_Lady on Ebay. > > Article: 102555 of rec.radio.amateur.boatanchors From: "We Are Devo!" Subject: Re: B2 spy set o n Ebay References: Message-ID: Date: 26 Jun 2006 00:09:19 GMT On 26/06/2006 at 00:59:12 mikeFNB wrote: > on behalf of everyone on this newsgroup > may i apologise for the actions certain persons LOL, I like it "certain persons", very good x2 :) -- "The computer can't tell you the emotional story. It can give you the exact mathematical design, but what's missing is the eyebrows." - Frank Zappa Article: 102556 of rec.radio.amateur.boatanchors From: "Brian Hill" Subject: FS Equip & Books Message-ID: <6qHng.1914$TP1.1385@fe05.lga> Date: Sun, 25 Jun 2006 21:14:25 -0500 Radio Physics Course - Ghirardi 2nd 1942 972pg Some wear Binding good $8 Elec Essentials of Radio Slurzburg Osterheld 1944 529pg Minor wear $10 B&K Mod 1822 Freq Counter $39 8lbs http://webpages.charter.net/brianhill/bk.jpg HP 606A Freq Gen The filter caps are loose and hanging on there wires but looks good Overall Untested. The band turret turns smothly and all controls are free. Face is nice and all knobs are there. It should be an easy restore and I think it'll be fine. $65 about 50lb http://webpages.charter.net/brianhill/hp.jpg Prices do not include shipping. shipping is from 55992 -- Regards B.H. Souther, MN USA Radios- R-5000, NRD525,SP-600,SX-28,Eton E1 Brian's Radio Universe http://webpages.charter.net/brianhill/500.htm Brian's Basement http://webpages.charter.net/brianhill/6.htm Remove your HAT to reply directly brianehillHAT@charter.net Article: 102557 of rec.radio.amateur.boatanchors From: "Smokey" Subject: 2nd try...3946 KC XTAL to swap Date: Sun, 25 Jun 2006 21:23:24 -0500 Message-ID: <129uh4rmbvc14ec@corp.supernews.com> Ok, Ok...I guess no one has a 3 5 4 6 +/- 1 KC crystal they wish to swap, so maybe there is someone out there with ANY FT-243 or Z-9 crystal that falls in the lower 100 KC of 80 or 40 meters they'd like to trade for a brand new 3946 kc crystal? My preferences are 3542 to 3560 or 7030 to 7055 kc . The 3946 crystal is brand, spankin' new and in a Z-9 case with 0.092 pins so it'll work anywhere an FT-243 does. It's a Petersen Radio crystal. Tanks! Smokey telegrapher@hotmail.com Article: 102558 of rec.radio.amateur.boatanchors From: "Brian Reay" References: Subject: Re: B2 spy set o n Ebay Message-ID: Date: Mon, 26 Jun 2006 06:09:39 GMT "Jean Darley G1DLL" wrote in message news:TUDng.480198$tc.272933@fe2.news.blueyonder.co.uk... > > If, like usual, there is no comment from the perpetrator of this thread > when faced with the truth about something. I will take it that my Ebay > name has been vindicated on this newsgroup. Sorry is not a word in his > vocabulary so he usually goes silent instead. Jean, I've nothing to apologise for. I stirred up interest in the auction, contacted VMARS (check the EMails in circulation) so the true item was known (much more that the original offer), and it appears that a far more sensible bid has been made. I hope the family are happy and I wish the new owner of the B2 set well, whoever he is. As for the rest, I think is terrible that you seek to use the death of a well liked local amateur to ferment a one sided row that has resulted in one of the BRATS with a police caution for harassment. I will not comment further here, out of respect for Peter and his family Brian Article: 102559 of rec.radio.amateur.boatanchors From: kludge@panix.com (Scott Dorsey) Subject: Re: 2nd try...3946 KC XTAL to swap Date: 26 Jun 2006 10:56:23 -0400 Message-ID: References: <129uh4rmbvc14ec@corp.supernews.com> Smokey wrote: >Ok, Ok...I guess no one has a 3 5 4 6 +/- 1 KC crystal they wish to swap, so >maybe there is someone out there with ANY FT-243 or Z-9 crystal that falls >in the lower 100 KC of 80 or 40 meters they'd like to trade for a brand new >3946 kc crystal? My preferences are 3542 to 3560 or 7030 to 7055 kc . The >3946 crystal is brand, spankin' new and in a Z-9 case with 0.092 pins so >it'll work anywhere an FT-243 does. It's a Petersen Radio crystal. Tanks! Call ICM and order one for fifteen bucks or so. It's not that big a deal to get crystals made. The alternative is that you can skew the crystal you have to a higher frequency... it's harder to move it lower than to move it higher, though. But grinding it down with Ajax cleanser is not that hard a thing to do, especially today when you can just stick it in a little Pierce oscillator with a frequency counter and see where it's moved to in a second. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." Article: 102560 of rec.radio.amateur.boatanchors From: "Smokey" Subject: Re: 2nd try...3946 KC XTAL to swap Date: Mon, 26 Jun 2006 10:36:31 -0500 Message-ID: <129vvk1e102i75@corp.supernews.com> References: <129uh4rmbvc14ec@corp.supernews.com> Jeez...I can get crystals; why are you guys so defensive?. I'm simply looking for someone whose got one to swap that is interested in one I don't need. By the way...if you are paying $15 to $25 for crystals you are not shopping very wisely. I'll worry about my crystal issues/ I don't need lectures. "Chuck Harris" wrote in message news:Mr-dnbFTc_PcwgLZnZ2dnUVZ_rGdnZ2d@rcn.net... > Smokey wrote: > > Ok, Ok...I guess no one has a 3 5 4 6 +/- 1 KC crystal they wish to swap, so > > maybe there is someone out there with ANY FT-243 or Z-9 crystal that falls > > in the lower 100 KC of 80 or 40 meters they'd like to trade for a brand new > > 3946 kc crystal? My preferences are 3542 to 3560 or 7030 to 7055 kc . The > > 3946 crystal is brand, spankin' new and in a Z-9 case with 0.092 pins so > > it'll work anywhere an FT-243 does. It's a Petersen Radio crystal. Tanks! > > > > Smokey > > telegrapher@hotmail.com > > Hi Smokey, > > What do you suppose the odds are that someone who is running rock bound on > 80m, is going to need the exact rock you have, and have the exact rock you > need? Especially given that yours is in the middle of the phone section? > > I checked through my FT243's, and unfortunately, they have been thoroughly > picked over for 80 an 40m rocks. > > Give JAN a call. I am sure that they still have gobs of FT243's in their > scrap bin. It couldn't possibly cost more than $25 to get one custom > ground to meet your needs. > > -Chuck Harris Article: 102561 of rec.radio.amateur.boatanchors From: "The Magnum" References: <1151250264.516413.162020@c74g2000cwc.googlegroups.com> Subject: Re: B2 spy set o n Ebay Date: Mon, 26 Jun 2006 18:07:36 +0100 Message-ID: <44a0148b$0$8848$834e42db@reader.greatnowhere.com> "Dave X" wrote in message news:1151250264.516413.162020@c74g2000cwc.googlegroups.com... You're always boasting about.. // Blah.. blah... blah... blah // ** Shut up Gareth Alun Evans, you are indeed, a pathetic jealous fool.** I for one have never heard Brian "Boasting" about money. Are you bitter because you have reached a point in your life yourself where you know you aren't going any further, are unemployed/unemployable and live either in a rented flat or council house you will never own and will never be able to have cash to spend on a whim? Was I correct in my assumption that to make ends meet , you rummage in the bins of your neighbours to find "copper wire"? Is it because you never amounted to much and when you shove off this mortal coil, no one will really miss you? Boo hoo, poor Gareth...a pathetic figure of a man... Graham -- -.-. -... / .-. .- -.. .. --- Radio is only a Hobby. Don't let it rule your life... 73/51 - Graham, 26-Golf Charlie-19 (www.open-channel.co.uk) Article: 102562 of rec.radio.amateur.boatanchors From: "The Magnum" References: Subject: Re: B2 spy set o n Ebay Date: Mon, 26 Jun 2006 18:12:58 +0100 Message-ID: <44a015cc$0$8846$834e42db@reader.greatnowhere.com> "We Are Devo!" wrote in message news:xn0enwi43a49r8001@news.zen.co.uk... > On 25/06/2006 at 16:23:09 M3OSN Brian Reay wrote: > > > Seems VERY under bid and from a silent key sale. Seems wrong the > > widow should be ripped off when it goes for only £1000 > > Can you _prove_ that? It says the auction end price was £1,776. It may be under priced or it may be the market price.. I don't know, so was someone genuine blocked from making a bid? Armed with that information they may have a valid point... otherwise how come they never bid on it themselves if it was so valuable.. or did they? Graham -- -.-. -... / .-. .- -.. .. --- Radio is only a Hobby. Don't let it rule your life... 73/51 - Graham, 26-Golf Charlie-19 (www.open-channel.co.uk) Article: 102563 of rec.radio.amateur.boatanchors From: "We Are Devo!" Subject: Re: B2 spy set o n Ebay References: <44a015cc$0$8846$834e42db@reader.greatnowhere.com> Message-ID: Date: 26 Jun 2006 17:18:18 GMT On 26/06/2006 at 18:12:58 The Magnum wrote: > It says the auction end price was £1,776. Which means the widow was not ripped off! Or was there another agenda from M3OSN, as now we know the seller and he have previous, dontcha just love a mystery? ;-) nnn -- "The computer can't tell you the emotional story. It can give you the exact mathematical design, but what's missing is the eyebrows." - Frank Zappa Article: 102564 of rec.radio.amateur.boatanchors Message-ID: <44A01868.13332BF8@tpg.com.au> Date: Tue, 27 Jun 2006 03:24:56 +1000 From: aalaan@tpg.com.au Subject: AR 88 Wanted. A nice example of this fabulous RCA wartime receiver. Would really like the version with the S-meter but maybe that's too optimistic! Will make do with the D or the LF! Reply on here. I am in Australia, so will not have to use a C5 to move it! Article: 102565 of rec.radio.amateur.boatanchors From: anon Subject: Re: Help Please to identify this old ex WD "Receiver" Date: Mon, 26 Jun 2006 18:38:06 +0100 Message-ID: References: <1150914118.701837.235300@i40g2000cwc.googlegroups.com> In article , chris+news@suslowicz.org (Chris Suslowicz) in rec.radio.amateur.boatanchors writ: > >"ron_ayling" wrote: > >>Hi, I've recently purchased what looks like an old Ex WD unit, with no >>identity plates, and I'd really like to identify it, I'm sure its a >>receiver though it could be a converter of some description, quite >>large front panel 280 by 170mm 300mm deep, centre left of the front >>panel are three controls marked Aerial RF and Oscillator, each having a >>little window that clicks round 0 to 9, to the right is a paxolin >>panel with test points marked V1 to V10, bottom of panel sockets left >>to right marked RF input, Output, Power Input, Gain control, inside the >>three front panel controls connect to what looks like a front end box >>which held two valves marked VR138 and VR137, there are then six IF >>cans with a single coil inside and six valve holders alongside marked >>VR65... > >With those valves, it's ex-RAF, probably late WW2 to 1950s vintage. > >VR137 is an EC52 low power VHF transmitting triode on B9G base. >VR138 is unlisted in anything I have to hand, unfortunately. >VR65 is an SP61 pentode (100MHz max frequency) on Maxda Octal base. > >The EC52 is capable of 7 watts and 300MHz, so it's a transceiver >or transponder of some sort, I'd guess. (Possibly IFF?) > Dunno, can't remember ever seeing one of those as a power amp. Usually they were the local oscillator for VHF kit. I don't recognise the stuff as described, but the Gee nav receiver had a similar valve line-up if my memory is right. The main chassis was the R1355, with 6? SP61 IF amps, and the RF26/7 plugins were EF54 RF, EF54 Mixer, EC52 LO. Suggest a repackaged Gee rx to the OP. Tuned 20-70 Mc/s, IF 7Mc/s, again trusting my memory. R1355 wasn't much use for anything, save that the RF26/7 units were stripped down for the very well made 2 gang and single gang 75pf tuning caps, and the Muirhead epicyclic drive. Many amateurs bought one of the RF2?-25 plugins for a lifetime's supply of 30 pf beehive trimmers, I'll be leaving half a dozen beehives to my heirs. j. Article: 102566 of rec.radio.amateur.boatanchors From: "The Magnum" References: <44a015cc$0$8846$834e42db@reader.greatnowhere.com> Subject: Re: B2 spy set o n Ebay Date: Mon, 26 Jun 2006 18:48:48 +0100 Message-ID: <44a01e32$0$8845$834e42db@reader.greatnowhere.com> "We Are Devo!" wrote in message news:xn0enxwlk18jplj004@news.zen.co.uk... > On 26/06/2006 at 18:12:58 The Magnum wrote: > > > It says the auction end price was £1,776. > > Which means the widow was not ripped off! > Or was there another agenda from M3OSN, as now we know the seller and > he have previous, dontcha just love a mystery? ;-) > > nnn Yes, there is something most definitely on the boil. Somehow though I find myself lacking in interest to pursue it ;o) Graham -- -.-. -... / .-. .- -.. .. --- Radio is only a Hobby. Don't let it rule your life... 73/51 - Graham, 26-Golf Charlie-19 (www.open-channel.co.uk) Article: 102567 of rec.radio.amateur.boatanchors From: "We Are Devo!" Subject: Re: B2 spy set o n Ebay References: <44a015cc$0$8846$834e42db@reader.greatnowhere.com> <44a01e32$0$8845$834e42db@reader.greatnowhere.com> Message-ID: Date: 26 Jun 2006 18:43:29 GMT On 26/06/2006 at 18:48:48 The Magnum wrote: > Yes, there is something most definitely on the boil. Somehow though I > find myself lacking in interest to pursue it ;o) Likewise Graham, I just watch the usual suspects ;o) -- "The computer can't tell you the emotional story. It can give you the exact mathematical design, but what's missing is the eyebrows." - Frank Zappa Article: 102568 of rec.radio.amateur.boatanchors From: ritchi50@optonline.net Subject: National NC-183D HELP Message-ID: <45q0a2drthqgp9p5ga77losrequ95lr4gg@4ax.com> Date: Mon, 26 Jun 2006 19:07:42 -0400 Hi I just got a National NC-183D Receiver It was sitting for a few years. I turned it on and it seems the RF gain is low. As you turn up the RF gain nothing is heard til you get up to to the number 8 on dial. So no receive until you turn dial up to 8 and I turn it up to 10, I hear signals on AM SSB fine. But need to get the RF gain higher so signals come in stronger. The glass tubes seem to be on. Can it be the tubes or something else? It seems to receive all bands but 40 Meters. Thanks for reading Rich NJ Article: 102569 of rec.radio.amateur.boatanchors From: "Charles" Subject: Speaking of XTALS Message-ID: <3N0og.25871$gv2.1067@bignews3.bellsouth.net> Date: Mon, 26 Jun 2006 21:32:49 -0500 Just got a Heath Sixer. I built on way back when (in the olden days). I need a 8.400 mc FT243 Crystal. I will swap your one for my two. 7.045 and 7.050 Let me know. Charles Article: 102570 of rec.radio.amateur.boatanchors Subject: Re: Speaking of XTALS From: k5dh@raytheon.com (-=H=-) References: <3N0og.25871$gv2.1067@bignews3.bellsouth.net> Message-ID: Date: Tue, 27 Jun 2006 12:19:54 GMT Charles, There's an 8.400 mc crystal on eBay right now: http://cgi.ebay.com/8400KC-CRYSTAL-FOR-6-METERS_W0QQitemZ9741742906QQihZ008QQca tegoryZ4671QQrdZ1QQcmdZViewItem Item number is 9741742906 in case that link messes up. 73, Dean K5DH In article <3N0og.25871$gv2.1067@bignews3.bellsouth.net>, k4qzo@bellsouth.net says... > >Just got a Heath Sixer. I built on way back when (in the olden days). I >need >a 8.400 mc FT243 Crystal. I will swap your one for my two. 7.045 and 7.0 >50 >Let me know. Charles > > Article: 102571 of rec.radio.amateur.boatanchors From: "YT" References: <1151388140.351668.270670@m73g2000cwd.googlegroups.com> Subject: Re: KENWOOD SOFTWARE / MOST RADIOS Message-ID: Date: Tue, 27 Jun 2006 13:45:56 GMT Ebay removes your auctions because you are a pirate and don't know how to use the caps lock... Jay611j@yahoo.com , hmmm you ARE the same piece of shit that has been copying the BAMA manuals and selling them on Ebay. How much more of a loser could you possibly be? Why don't you get a real job like selling drugs or your plasma. Even collecting aluminum on the side of a road would be more respectable than what you have been doing. You are scum. "Jay" wrote in message news:1151388140.351668.270670@m73g2000cwd.googlegroups.com... >I HAVE 10 COPIED "BURNED" CDS OF A TON OF KENWOOD PROGRAMS, WILL > PROGRAM MOST HANDHELDS AND MOBILES. IF YOU HAVE EBAY, LET ME KNOW AND I > WILL SET UP AN AUCTION. MY EBAY ID IS: EEE_LIGHTS EBAY KEEPS REMOVING > THEM SO ITS FIRST COME FIRST SERVE. $25 PER CD. THANKS GUYS! > Article: 102572 of rec.radio.amateur.boatanchors From: Barry OGrady Subject: Re: B2 spy set o n Ebay Date: Wed, 28 Jun 2006 00:03:16 +1000 Message-ID: References: On 26 Jun 2006 00:09:19 GMT, "We Are Devo!" wrote: >On 26/06/2006 at 00:59:12 mikeFNB wrote: > >> on behalf of everyone on this newsgroup >> may i apologise for the actions certain persons > >LOL, I like it "certain persons", very good x2 :) He didn't apologise for his top posting or lack of punctuation. Barry ===== Home page http://members.iinet.net.au/~barry.og Article: 102573 of rec.radio.amateur.boatanchors From: "Charlie Hugg" Subject: FS Drake SL-300 CW Filter for the TR7/R7 Message-ID: Date: Tue, 27 Jun 2006 10:56:23 -0500 FS New in the Box Drake SL-300 Filter. This is the 300hz CW Filter for the Drake TR7 or R-7. Also included is the Instruction Sheet. Price is $50 plus shipping. Thanks, Charlie Hugg, K5MBX Article: 102574 of rec.radio.amateur.boatanchors From: Straydog Subject: Re: SB-230 tuning Date: Tue, 27 Jun 2006 16:36:12 -0400 Message-ID: References: <1151423927.624377.232040@u72g2000cwu.googlegroups.com> On Tue, 27 Jun 2006, caheaton@netzero.net wrote: > First, my thank you's are in order to all who have answered my posts > concerning this amplifier...I have not yet fired it up, but I'm getting > there! (Taking it easy and following the good advice I've received). > Anyway, I've browsed the Heathkit manual and their instructions for > tuning the amp seem rather complicated....they tend to focus on tuning > for output and very specific plate and grid currents. Would it be safe > for me to instead use the following procedure (which is likely to get > me to the same point, but is easier to remember....it's the technique > we used t for the old club amplifier): > > 1) Turn on amplifier (of course) and allow it to warm up. > 2) Set exciter for 80 watts output on cw (amp is supposed to take 100 > watts, but I want to be on the safe side). > 3) Set pulsed tuner aid so that I am running about a 25% duty cycle > (average power into amp will be 80 watts peak, but only 20 watts > average). I might even forget the pulser, and just use pure CW and start at 20 watts of pure CW until you get the feel of "amp on" vs. "amp off" and the effect of tuning. > 4) Set amp tune and plate controls to suggested starting points. > 5) Switch amp out of bypass. > 6) Tune amp "Load" for max power out, adjust "Tune" to dip plate > current, check grid and plate currents. I would recommend setting the loading control far CCW to start (i.e. low), and tune the plate for maximum RF output. You may or may not see much of a "dip" in plate current as you go through resonance (depending on what "class" the amp is really running in), but you should see RF output go >from zero to something high. > 7) Increase pulsed exciter power gradually while repeating step 6. > 7) Repeat step 7 until desired power out is achieved (keeping in mind > that I need to stay well within allowed grid and plate currents). Another issue you left out but you need to watch is what the SWR is between the amplifier and its load. Quite a few of us (including me) use an antenna tuner between our rigs and the transmission line. You almost don't care what the SWR is between the tuner and the antenna, but on the coax between the rig and the antenna tuner, you better be low (i.e. SWR 2:1 or lower, depending on the rig) instead of high (i.e. 3:1 or more) because that reflected power will end up being dissipated in the tube/heatsink. And, another thing: once I was a little off resonance on my SB-230 and after transmitting for 1-2 minutes, the overtemp relay kicked in and put the amp into bypass until the heatsink cooled off (this will take a few more minutes, maybe less if you put a small fan on it) at which time the bypass kicked off and I had power again (leave all the switches on). So, you have to watch your plate resonance. If you raise loading, always recheck plate resonance. > > In a nutshell, that's how I remember tuning our club amp (although it > was near 20 years ago when I last tuned one.) Does this sound about > right? It seems much faster than the steps outlined by Heathkit and > safer too...also, would there be any problems with my signal if I keep > the exciter power fairly low...say at around 50 to 80 watts rather than > the 100 watts specified? Not a bad idea until you get a feel for how the amplifier behaves in tuning, how your lights dim on voice peaks, whether your circuit breakers/fuses blow when you talk up the amp (have a flashlight handy at night?), etc. (Granted, my output power will be lower, but > that is fine...especially while I'm still just testing the amp and if > any RFI will be generated by the amp.) > Thanks a bunch! > Craig KB8FGC > > Article: 102575 of rec.radio.amateur.boatanchors From: "K5VSE" Subject: Plate meter for Drake L5-B Message-ID: Date: Wed, 28 Jun 2006 01:15:55 GMT Desperately need a plate meter for my Drake L4-B that followed me home a few months ago. Can still tune it with grid current and W4 watt meter, as I've been around this racket for over 50 years. Thanks for any help you guys can offer K5VSE/Mike -- Formerly WB6VSE, Senior Tech. Amateur Division SBE/Linear Systems, Watsonville, CA Pupule384 On 3922 Nightly WEB Site: http://members.tripod.com/~sjsharks/index.html Restoring and using Drake: Radios, TR-4, TR-4C, ,RV-4C, Drake Twins: "C" line, L4-B, and Henry 2KD-5 APA 220, USS Okanogan, LSD31, USS Point Defiance All email scanned with Norton 2006 "In God We Trust" Article: 102576 of rec.radio.amateur.boatanchors From: Roger Subject: Re: Hallicrafters SX-101A Restoration Question Message-ID: <7kv3a215s4pvb0q3obnsacjl4rslfe66le@4ax.com> References: Date: Wed, 28 Jun 2006 00:02:03 -0400 On Sun, 25 Jun 2006 14:13:56 -0400, "Jim Barnard" wrote: >I am in the processing of restoring a Hallicrafters SX-101A model MKIIIA. > >The big black dial bezel on this radio has a smooth flat black finish. I all >the pictures that I have examined on the Internet, the bezel has a black >wrinkled finish. In disassembling the bezel from the front panel, it looks >like this was original because none of green painted on "screw seals" >appeared disturbed. > >Is this correct for this model or has someone done a masterful refinishing >job at some point in the past? > Early models of the 101 including the straight 101 had a flat black bezel. Only the later models had the crinkle finish. I'd have to go out and look but as I recall the 101A and the MKIII have a number of differences including the bezel finish, frequency coverage, and main tuning knob. Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com >Thanks for any suggestions/comments. > >Jim > Article: 102577 of rec.radio.amateur.boatanchors From: "August Johnson" Subject: Re: Repairing a BC-348 - An update and a few more questions.... Date: Wed, 28 Jun 2006 04:39:30 -0700 Message-ID: <12a4qjhsi3omo05@corp.supernews.com> References: <2cidnQ7So4AfdTzZnZ2dnUVZ_oKdnZ2d@velocitywest.com> Hi Dean, http://www.kg7bz.net/Manuals/BC-348/TO%2012R2-3BC-112.pdf Covers the K, L and R versions. 73, August Johnson KG7BZ "-=H=-" wrote in message news:fOmdnSc1PqmVcDzZnZ2dnUVZ_vKdnZ2d@centurytel.net... > Pete, > > I have an all-original BC-348-R that I picked up at a recent > hamfest. It's complete and in nice shape, but it's missing > the dynamotor. I need to locate one because once I have the > set restored and working, it's going aboard our Museum's B-17 > Flying Fortress (which means it has to run on 28 VDC). Any > leads will be appreciated. I'm also in need of a BC-348-R > manual. Apparently the "R" model is different from all of > the previous models, although I don't have a clue how. > > 73, > Dean K5DH Article: 102578 of rec.radio.amateur.boatanchors Subject: Re: Repairing a BC-348 - An update and a few more questions.... From: k5dh@raytheon.com (-=H=-) References: <2cidnQ7So4AfdTzZnZ2dnUVZ_oKdnZ2d@velocitywest.com> <12a4qjhsi3omo05@corp.supernews.com> Message-ID: Date: Wed, 28 Jun 2006 12:29:17 GMT Hi August, Wow! Thanks for making the manual available! I downloaded a copy to my computer just now. I'll burn it to a CD later. Thanks and 73! Dean K5DH In article <12a4qjhsi3omo05@corp.supernews.com>, ajohn_son@ubvri.net says... > >Hi Dean, > >http://www.kg7bz.net/Manuals/BC-348/TO%2012R2-3BC-112.pdf > >Covers the K, L and R versions. > >73, >August Johnson KG7BZ > >"-=H=-" wrote in message >news:fOmdnSc1PqmVcDzZnZ2dnUVZ_vKdnZ2d@centurytel.net... >> Pete, >> >> I have an all-original BC-348-R that I picked up at a recent >> hamfest. It's complete and in nice shape, but it's missing >> the dynamotor. I need to locate one because once I have the >> set restored and working, it's going aboard our Museum's B-17 >> Flying Fortress (which means it has to run on 28 VDC). Any >> leads will be appreciated. I'm also in need of a BC-348-R >> manual. Apparently the "R" model is different from all of >> the previous models, although I don't have a clue how. >> >> 73, >> Dean K5DH > > Article: 102579 of rec.radio.amateur.boatanchors From: "W4LM" Subject: Re: SB-230 tuning Date: Wed, 28 Jun 2006 09:01:46 -0400 Message-ID: References: <1151423927.624377.232040@u72g2000cwu.googlegroups.com> Craig, If it were me I would follow the Heath Kit instructions. I built that amplifier in 1976, still have it. I have run it at 500 ma for many years with it still putting out max power. I have had to replace the power supply filter capacitors, other than than been a good 600 watts output amplifier. While it might take a little longer to tune up, once you know what the setting should be for a given frequency, you then can preset those and save yourself alot of time. Larry/W4LM wrote in message news:1151423927.624377.232040@u72g2000cwu.googlegroups.com... > First, my thank you's are in order to all who have answered my posts > concerning this amplifier...I have not yet fired it up, but I'm getting > there! (Taking it easy and following the good advice I've received). > Anyway, I've browsed the Heathkit manual and their instructions for > tuning the amp seem rather complicated....they tend to focus on tuning > for output and very specific plate and grid currents. Would it be safe > for me to instead use the following procedure (which is likely to get > me to the same point, but is easier to remember....it's the technique > we used t for the old club amplifier): > > 1) Turn on amplifier (of course) and allow it to warm up. > 2) Set exciter for 80 watts output on cw (amp is supposed to take 100 > watts, but I want to be on the safe side). > 3) Set pulsed tuner aid so that I am running about a 25% duty cycle > (average power into amp will be 80 watts peak, but only 20 watts > average). > 4) Set amp tune and plate controls to suggested starting points. > 5) Switch amp out of bypass. > 6) Tune amp "Load" for max power out, adjust "Tune" to dip plate > current, check grid and plate currents. > 7) Increase pulsed exciter power gradually while repeating step 6. > 7) Repeat step 7 until desired power out is achieved (keeping in mind > that I need to stay well within allowed grid and plate currents). > > > In a nutshell, that's how I remember tuning our club amp (although it > was near 20 years ago when I last tuned one.) Does this sound about > right? It seems much faster than the steps outlined by Heathkit and > safer too...also, would there be any problems with my signal if I keep > the exciter power fairly low...say at around 50 to 80 watts rather than > the 100 watts specified? (Granted, my output power will be lower, but > that is fine...especially while I'm still just testing the amp and if > any RFI will be generated by the amp.) > Thanks a bunch! > Craig KB8FGC > Article: 102580 of rec.radio.amateur.boatanchors From: Straydog Subject: Re: SB-230 tuning Date: Wed, 28 Jun 2006 11:17:25 -0400 Message-ID: References: <1151423927.624377.232040@u72g2000cwu.googlegroups.com> I'd like to add one item to Dave's post below for caheaton's benefit: If you don't have a 50-52 ohm dummy load (pure resistance, dry or oil, whatever, but with capability to handle 100-200 watts of dissipation for at least as long as you will be spinning those knobs), please get one. And, learn how that amplifier tunes up going into a known, low SWR dummy load (your SWR meter is between the transceiver and the amp). Your antenna tunner (which is between the amp and the antenna feedline) shoud be tuned up for low SWR _BEFORE_ you turn on the amp. After you know the SWR is low, then turn on the amp and drive it with, say, that 20 watts of carrier, or with the microphone gain turned down. Once you are statisfied that the SWR is low with/without the amp in the circuit, then you can crank up either the carrier (alone) for touch-up tuning, or crank up the audio gain (and watch the room lights flicker, etc). And, I'll go along with the recommendation below to do the tune up pretty fast. ===== no change to below, included for reference and context ===== On Wed, 28 Jun 2006, Dave Edwards wrote: > Craig...At one time I had 4 SB230's > Now I have one on hf, and one converted to 6 meters. > Either tune by the book, or tune for maximum output....either way, just do > it fast. > The only big mistake to your steps I can see is not to start at 80 > watts....that is close to full drive. > I would say to start at around 20 watts. > Make SURE the SWR that the amp sees is reasonable. ...less than 1.8:1 or > so....If you have a tuner in that path, make sure it can handle the > power....nothing MFJ!!! > > Key down your rig while watching the amps' RF output and spin the plate knob > quickly each way to find a 'kick' or peak in output. At 20 watts drive, I'd > expect 150 or so watts out. Stop transmitting, and wait 5 or 10 seconds. Now > is the part that you only learn from experiance....it'd be nice if you were > doing it with a TS520's 6146 final....instead of an unobtanium > 8873....But.... > you need to transmit, and tune the load control while simultaneously > juggling the plate control. All the while looking at the wattmeter for more > output. At some point, rotating the load and peaking with the plate will > NOT end up in more output. That is where you stop. > Now you can increase power from the rig to whatever you want...but the load > and plate will have to be 'touched up' again with the increased drive. > Pulsers are kind of a waste. Someone who has used an amp for a while should > be able to tune it up in 2 or 3 three second transmissions. If you are > playing with knobs while key down for 15 to 20 seconds, you shouldn't own an > amp!! > ...Dave > > > wrote in message > news:1151423927.624377.232040@u72g2000cwu.googlegroups.com... >> First, my thank you's are in order to all who have answered my posts >> concerning this amplifier...I have not yet fired it up, but I'm getting >> there! (Taking it easy and following the good advice I've received). >> Anyway, I've browsed the Heathkit manual and their instructions for >> tuning the amp seem rather complicated....they tend to focus on tuning >> for output and very specific plate and grid currents. Would it be safe >> for me to instead use the following procedure (which is likely to get >> me to the same point, but is easier to remember....it's the technique >> we used t for the old club amplifier): >> >> 1) Turn on amplifier (of course) and allow it to warm up. >> 2) Set exciter for 80 watts output on cw (amp is supposed to take 100 >> watts, but I want to be on the safe side). >> 3) Set pulsed tuner aid so that I am running about a 25% duty cycle >> (average power into amp will be 80 watts peak, but only 20 watts >> average). >> 4) Set amp tune and plate controls to suggested starting points. >> 5) Switch amp out of bypass. >> 6) Tune amp "Load" for max power out, adjust "Tune" to dip plate >> current, check grid and plate currents. >> 7) Increase pulsed exciter power gradually while repeating step 6. >> 7) Repeat step 7 until desired power out is achieved (keeping in mind >> that I need to stay well within allowed grid and plate currents). >> >> >> In a nutshell, that's how I remember tuning our club amp (although it >> was near 20 years ago when I last tuned one.) Does this sound about >> right? It seems much faster than the steps outlined by Heathkit and >> safer too...also, would there be any problems with my signal if I keep >> the exciter power fairly low...say at around 50 to 80 watts rather than >> the 100 watts specified? (Granted, my output power will be lower, but >> that is fine...especially while I'm still just testing the amp and if >> any RFI will be generated by the amp.) >> Thanks a bunch! >> Craig KB8FGC >> > > > Article: 102581 of rec.radio.amateur.boatanchors From: Straydog Subject: Re: SB-230 tuning Date: Wed, 28 Jun 2006 11:25:54 -0400 Message-ID: References: <1151423927.624377.232040@u72g2000cwu.googlegroups.com> On Wed, 28 Jun 2006, Roger D Johnson wrote: > Straydog wrote: >> > > >> because that reflected power will end up being dissipated in the >> tube/heatsink. > > Another "Old Wives Tale"! Tubes are only "matched" to the point where > the desired output is obtained. All depends on your definition of matched. Reflected power will see the amp as a > mismatch and will again be reflected back towards the antenna. I think that is only partly true. Yes, there will be reflectd power going back out to the antenna, but there was an article in QST back a number of years ago. Yes, the mismatch also results in higher plate dissipation, too. I will correct myself about reflected power being disipated in tube, but the mismatch will increase the plate dissipation. The other issue is being off plate resonance. I had my SB-230 trip the overtemp relay when I moved frequency and did not retune the final. You also need to allow for loss in the transmission line. Not all of what gets reflected at the mismatches ends up at the other end of the transmission line. SWR (i.e. reflected power generated at the antenna/feedline) would not be a problem if the transmission line were long and lossy. > 73, Roger > > -- > Remove tilde (~) to reply > > Remember the USS Liberty (AGTR-5) > http://ussliberty.org/ > Article: 102582 of rec.radio.amateur.boatanchors From: "Smokey" Subject: Re: National NC-183D HELP Date: Wed, 28 Jun 2006 11:37:07 -0500 Message-ID: <12a5c32t1s2pb13@corp.supernews.com> References: <45q0a2drthqgp9p5ga77losrequ95lr4gg@4ax.com> Check your RF gain control. Sounds like you might be using an audio taper pot where a linear taper pot is required. If you've got the correct taper maybe the pot has gone out of its design curve. I have experienced this on a couple of vintage receivers. I had one that responded just like yours...no gain till "8" or "9" then lots of gain. I also had one going the other way, near full volume by "2" or "3" then little increase. Replacing with a fresh proper taper pot corrected both. Another pot anomaly is where the increases normally as your rotate the pot then you hear a little "pop" and the volume goes high or low. Pot problem that (often) contact cleaner will not fix. It's mechanical and often dependent on the taper that was designed or has developed over the years due to wear, age, dirt etc etc. Good luck. Smokey -- Important note: When replying to my e-mail please delete the words, "nospam" >from my e-mail address. wrote in message news:45q0a2drthqgp9p5ga77losrequ95lr4gg@4ax.com... > Hi > I just got a National NC-183D Receiver > It was sitting for a few years. > I turned it on and it seems the RF gain is low. > As you turn up the RF gain nothing is heard til you > get up to to the number 8 on dial. > So no receive until you turn dial up to 8 and I turn it up to 10, > I hear signals on AM SSB fine. But need to get the RF gain higher > so signals come in stronger. > The glass tubes seem to be on. > Can it be the tubes or something else? > It seems to receive all bands but 40 Meters. > Thanks for reading > Rich NJ Article: 102583 of rec.radio.amateur.boatanchors From: "Jimmie D" References: <120i0qb41ith58e@corp.supernews.com> Subject: Re: Younger Sister Caught In BathTub With Hidden Cam... 4295 [1/2] Message-ID: Date: Wed, 28 Jun 2006 14:36:44 -0400 "Ralph Mowery" wrote in message news:NH8Of.6206$F56.949@newsread3.news.atl.earthlink.net... > > "Butch Magee" wrote in message > news:120i0qb41ith58e@corp.supernews.com... >> Ron H wrote: >> > I certainly hope everyone in this list is smart enough to NEVER open a > file >> > with the .scr extension! >> > >> > >> > Carry On! >> > K3PID >> > Ron H. >> > >> > >> I don't mind my ignorance showing,...what is an .scr ext? >> >> KF5DE > > The .scr is usually the screen saver program extentions. They are > exicutable programs just like the .exe programs. They can take over the > computer and do almost anything. Good way to pass on a virus or worm or > anything if the programmer does not want to really use them as a screen > saver. > > My daughter opened one on her computer, All the text looked like Klingon after that. Had to reload Windows to fix it but that didnt end the problem. After the reload and I thought all was fixed I discovered all the shortcuts to internet sites took me to the same place, an extremely graphic gay porn site. Good thing my daughter was in school at the time and even more fortunate that I decided to click around on some of her internet shortcuts. The first thing she does when she gets in from school is get on the internet. Article: 102584 of rec.radio.amateur.boatanchors From: thierry_._stora_@_cegetel_._net Subject: Re: Repairing a BC-348 - An update and a few more questions.... Date: Wed, 28 Jun 2006 22:38:39 +0200 Message-ID: References: <2cidnQ7So4AfdTzZnZ2dnUVZ_oKdnZ2d@velocitywest.com> Dean, >... but it's missing >the dynamotor. I need to locate one because once I have the >set restored and working, it's going aboard our Museum's B-17 >Flying Fortress (which means it has to run on 28 VDC). Any >leads will be appreciated. have a look at the following URL, they advertise DM21s at a reasonable price: http://www.armyradio.com/arsc/customer/home.php?cat=86 Regards, Thierry Stora http://www.chapelon.net Article: 102585 of rec.radio.amateur.boatanchors From: thierry_._stora_@_cegetel_._net Subject: Re: Repairing a BC-348 - An update and a few more questions.... Date: Wed, 28 Jun 2006 22:52:28 +0200 Message-ID: References: <2cidnQ7So4AfdTzZnZ2dnUVZ_oKdnZ2d@velocitywest.com> oups, apologies for the mistake, everyone knows that the DM21 runs on 12-14 volts ... Sorry! On Wed, 28 Jun 2006 22:38:39 +0200, thierry_._stora_@_cegetel_._net wrote: >Dean, > >>... but it's missing >>the dynamotor. I need to locate one because once I have the >>set restored and working, it's going aboard our Museum's B-17 >>Flying Fortress (which means it has to run on 28 VDC). Any >>leads will be appreciated. > >have a look at the following URL, they advertise DM21s at a reasonable >price: > >http://www.armyradio.com/arsc/customer/home.php?cat=86 > >Regards, >Thierry Stora > >http://www.chapelon.net Thierry Stora http://www.chapelon.net Article: 102587 of rec.radio.amateur.boatanchors From: et472@FreeNet.Carleton.CA (Michael Black) Subject: Re: Voip in Amateur Radio,Voip Updated Howto, Date: 29 Jun 2006 02:14:51 GMT Message-ID: References: <1151542273.745779.240290@i40g2000cwc.googlegroups.com> Don Bowey (dbowey@comcast.net) writes: > On 6/28/06 5:51 PM, in article > 1151542273.745779.240290@i40g2000cwc.googlegroups.com, "bandbroad@gmail.com" > wrote: > >> Voip in Amateur Radio,Voip Updated Howto, >> Voice Over IP is a new communication means that let you telephone with >> Internet at almost null cost.How this is possible, what is the >> standard, what systems are used, how cost.. >> >> http://flying-rugs.com/voip/VoIP-HOWTO.html >> > > In my opinion VOIP and amateur radio shouldn't be mentioned in the same > post. > > VOIP is a simple process of sending priority voice packets over the > internet, almost the same as just as any data packet is sent. It has > nothing to do with ham radio unless you want to use it for a patch. > > Don > Back in the sixties, CQ ran an article about DX'ing by telephone, actually I think there was a followup, including a photo of a DXpedition using a remote phone. I can't remember if it was explaining the joys of this, or a warning that it was a conspiracy from the telephone company. Of course, the article or articles ran in an April issue, and of course it was an April Fool's Day article. Michael VE2BVW Article: 102588 of rec.radio.amateur.boatanchors From: "Craig" References: <1151423927.624377.232040@u72g2000cwu.googlegroups.com> <_oudnYuH6-vwHj_ZnZ2dnUVZ_qadnZ2d@comcast.com> Subject: Re: SB-230 tuning Date: Wed, 28 Jun 2006 23:12:16 -0400 Message-ID: <7af95$44a34504$4831d174$21567@FUSE.NET> Thanks again to the group for all the advice. Yes, I had planned on making sure the antenna was tuned before hitting it with the amp (guess I should have mentioned that). The tuner I bought should take the power okay...recently purchased a used (but in great shape) Nye Viking MB-II. I also have a Heathkit Cantenna dummy load (with oil) I purchased at the same Hamfest, so I should be all set in that department. I've also run a dedicated circit for the amp (240 volts) and while I was at it ran a dedicated 120 volt circuit for the rest of my shack's equipment....so at least the amp shouldn't be dimming the lights! :-) Thanks again and please keep up the discussion....I'm absorbing all of this collected wisdom and will blend it to form my own procedure....hopefully none of this will be for naught! 73, Craig KB8FGC Article: 102589 of rec.radio.amateur.boatanchors Subject: Re: Repairing a BC-348 - An update and a few more questions.... From: k9uwaREMOVE@THISarrl.netSTUFF (John Goller, k9uwa) References: <2cidnQ7So4AfdTzZnZ2dnUVZ_oKdnZ2d@velocitywest.com> <1151541536.562361.319940@75g2000cwc.googlegroups.com> Message-ID: Date: Thu, 29 Jun 2006 14:13:57 GMT In article <1151541536.562361.319940@75g2000cwc.googlegroups.com>, analogdino@rogers.com says... > > >soon as I can get a "round tuit", a most necessary servicing device, >you will agree! >Cheers, >Roger > I got rid of my Round Tuit a few years ago ... too many projects were getting done and no time to goof off left! It was one that State Farm used to pass out to customers... John k9uwa Article: 102590 of rec.radio.amateur.boatanchors From: "Steve N." Subject: Re: Repairing a BC-348 - An update and a few more questions.... Date: Thu, 29 Jun 2006 13:42:06 -0500 Message-ID: References: <2cidnQ7So4AfdTzZnZ2dnUVZ_oKdnZ2d@velocitywest.com> <1151541536.562361.319940@75g2000cwc.googlegroups.com> "John Goller, k9uwa" wrote in message news:FeRog.54705$1i1.3855@attbi_s72... > In article <1151541536.562361.319940@75g2000cwc.googlegroups.com>, > analogdino@rogers.com says... > > ... > I got rid of my Round Tuit a few years ago ... too many projects > were getting done and no time to goof off left! ... > John k9uwa > Holy cryminy! Is that the problem? I have two of those little buggers. A wood one and a rubber one. No wonder I got no time. 73, Steve, K9DCI Article: 102591 of rec.radio.amateur.boatanchors Message-ID: <44A42F64.348072E2@shaw.ca> From: Irv Finkleman Subject: Re: Voip in Amateur Radio,Voip Updated Howto, References: <1151542273.745779.240290@i40g2000cwc.googlegroups.com> Date: Thu, 29 Jun 2006 19:51:36 GMT Don Bowey wrote: > > On 6/28/06 5:51 PM, in article > 1151542273.745779.240290@i40g2000cwc.googlegroups.com, "bandbroad@gmail.com" > wrote: > > > Voip in Amateur Radio.... > > In my opinion VOIP and amateur radio shouldn't be mentioned in the same > post. > > VOIP is a simple process of sending priority voice packets over the > internet, almost the same as just as any data packet is sent. It has > nothing to do with ham radio unless you want to use it for a patch. > > Don Can you get QSL's for VOIP contacts? :-) Irv VE6BP -- -------------------------------------- Diagnosed Type II Diabetes March 5 2001 Beating it with diet and exercise! 297/215/210 (to be revised lower) 58"/43"(!)/44" (already lower too!) -------------------------------------- Visit my HomePage at http://members.shaw.ca/finkirv/index.html Visit my Baby Sofia website at http://members.shaw.ca/finkirv4/index.htm Visit my OLDTIMERS website at http://members.shaw.ca/finkirv5/index.htm -------------------- Irv Finkleman, Grampa/Ex-Navy/Old Fart/Ham Radio VE6BP Calgary, Alberta, Canada Article: 102592 of rec.radio.amateur.boatanchors From: Straydog Subject: Re: SB-230 tuning Date: Thu, 29 Jun 2006 19:10:18 -0400 Message-ID: References: <1151423927.624377.232040@u72g2000cwu.googlegroups.com> email and post... see below On Wed, 28 Jun 2006, Craig wrote: > Thanks again to the group for all the advice. Yes, I had planned on making > sure the antenna was tuned before hitting it with the amp (guess I should > have mentioned that). The tuner I bought should take the power > okay...recently purchased a used (but in great shape) Nye Viking MB-II. I > also have a Heathkit Cantenna dummy load (with oil) I purchased at the same > Hamfest, so I should be all set in that department. I've also run a > dedicated circit for the amp (240 volts) and while I was at it ran a > dedicated 120 volt circuit for the rest of my shack's equipment....so at > least the amp shouldn't be dimming the lights! :-) > Thanks again and please keep up the discussion....I'm absorbing all of this > collected wisdom and will blend it to form my own procedure....hopefully > none of this will be for naught! > 73, Craig KB8FGC > > > I'd like to add a few comments and retract one statement I made in an earlier post (and explain why I'm doing that). The retraction: I said something to the effect that (substantial) reflected power is not good for the amplifier because it will cause dissipation of extra heat in the tube and the tank circuit. I'd like to correct myself by saying I'm not sure if that is true or not (one guy said it was an "old wive's tale", and then I thought about it for a while and decided to add this comment that I am writing now. Walter Maxwell wrote a series (at least seven installments) of articles back in QST in 1974 or so (I have all seven, but it was indicated that there would be more installments). These were all very very very technical articles dealing with SWR by a very very very sharp guy. I re-read almost all of these articles last night to brush up on the problem of SWR. And, I remember most of his points and I accept almost all of his explanations. Its impossible, in a few sentences here, to summarize this very complex and widely misunderstood and un-understood topic (going by my own re-review and what was said in the articles). However, someday you might want to delve more deeply into an area that _may_ be better understood by the "experts" (i.e. the electrical engineers who go into the mathematics, equations, definitions of characteristics that are generally way beyond us amateur amateurs). I will mention the following which is my own "tentative" "understanding" (which I admit is incomplete). 1. Maxwell mentioned several other publications which agreed with his interpretations and several other publications by other guys who were also very very very sharp guys who held a viewpoint different from Maxwells. Hence, there remains in my mind questions about what is really going on in transmission lines. 2. Once I had an SB-200 amplifier (in the same power class as the 230, but with two 572-Bs instead of your 8873) and I had the peculiar situation where the SWR was 3:1 (no tuner), and the amplifier was showing proper plate voltage and current and the plates of the tubes were glowing red hot (not good). I was not in a position to analyze this situation except to note that there were a lot of conducting metal near the antenna and that may have made the SWR higher than it should have been AND caused the tube plates to overheat (no damage was done to the tubes since output was still OK). 3. There is a notion that RF going out a transmission line and encountering a mismatched antenna will be partly absorbed by the antenna and partly reflected back towards the transmitter/amplifier. Most people are afraid of that reflected power. Maxwell, and other genius-whips, say that when that reflected power comes back and hits the matching network between the amp/xmtr, all of it gets re-reflected back to the antenna (I saw nothing in the text that says part of it gets reflected and anther part gets absorbed by the amp/xmtr, so that implies that he says it all gets re-reflected back out to the antenna. So, what is bad for efficiency in transfering RF from the amp/xmtr to the antenna is transmission line loss which absorbs (attenuates, db/100 ft) RF on the way to the antenna, and attenuates again the reflected power, and attenuates again the re-reflected power going back to the antenna. Presumably there are an endless re-re-re-etc-reflections every time the RF goes out the end of the coax and into either a tuning network (at the amp/xmtr) or the junctino entering the mismatched antenna. So, if you use a low loss (=low attenuation) coax, then it doesn't matter what your SWR is. One observation I've made that is consistent with Maxwell's prediction is that if I de-tune my antenna tuner from its lowest reflected power level, then _both_ forward and reflected power go up (this is not inconsistent with Maxwell's prediction that RF coming back from the antenna is re-reflected back towards the antenna, thus making the forward power go up because it includes not only transmitter output but the re-reflected power that goes in the same direction (back out to the antenna). One observation that is not consistent (unless someone here wants to help me better understand this) is that most of the new (solid-state) rigs coming out have some kind of "SWR" fold-back protection that causes output power to become reduced when SWR goes higher than some threshold. A few cases of powering into wrong antennas has caused some of my gear to shut down. In one case, using my old Icom 707, detuning my antenna tuner from SWR 1.1 or nearby caused my Icom power output (as measured on BOTH the Icom output meter [whatever it really measures, the manual does not say] and the forward power needle on the double needle SWR meter on the antenna tuner) to cut back, automatically , when SWR goes over 2:1 and hits 1/3 of whatever maximum is when SWR hits 3:1. The manufacturers put this protection into these circuits for a reason. Maxwell's article was written before solid-state broadband, fixed 50 ohm output impedances were established in all these new rigs. I think at one time I did put an SWR meter between the amplifier and the tuner, and another SWR meter in the feedline between the tuner and the antenna and demonstrated to myself that I could adjust the tuner for low SWR between the tuner and the amplifier but the SWR in the feedline between the tuner and the antenna was unchanged. This is consistent with Maxwell's predictions. And, you might "think" about all this as you play with your rig. For a lot of us, we, after all, want to play with our rigs more than we want to actually understand them (technically), and after all, it _is_ a hobby. Getting back to running your rig (xmtr and amp), I'd say that the practical advice is to have your antenna tuner adjusted for preferably lower--as low as you can get--reflected power on that coax between the xmtr/amp and the tuner. Maxwell would say tune the amp for currents and voltages appropriate to the tube's manufacturer specs AND for max power radiated (you would need a field strenght meter [a small antenna, sensitive meter, and diode--it does not have to be complicated], but then you can go overboard on all of this stuff). Finally, I don't recall you mentioning if you have had much experience tuning antenna tuners. The instructions are often incomplete and you sometimes can't just turn one knob for minimum reflected power and then the other knob for its minimum reflected power and then stop. What you have to do is go back to that first knob and move it, one way or the other, a little bit (raising the reflected power a bit), then go back to the second knob and see if the new dip in reflected power is higher or lower than the first time you adjusted the second knob. If the dip is higher, then you are going the wrong way with the re-adjustment of the first knob (so go back and re-adjust it the other way), and then adjustment of the second knob should get the reflected power down farther. Sometimes on some of my antennas, this adjustment "cycle" is quick and easy, and other times on other antennas it takes a lot of critical adjustment and many cycles back and forth. Its interesting in Maxwell's articles, that in the last installment that he wrote that I have (#7 in the series), he finally gets around to having a typical xmtr/amp->transmatch (tuner)->feedline->antenna and talks about getting the SWR down as low as possible even though he is "fighting" this in all of the other articles. I think he is at least mostly right about all of the surprising things he shows us we all misunderstand (I know I did) about SWR before I read the series of articles. However, I also sympathise with the notion that we do want to play at our hobbies rather than make "school" or "work" out of them, so I'll wish you good luck and don't overworry about hurting that amplifier. You may blow the tube someday and that will cost a bunch to replace, but play with it first and enjoy and learn how all the knobs work and get comfortable with how it all tunes up and what you get out of it in the process. Art, W4PON Article: 102593 of rec.radio.amateur.boatanchors From: "Denton" Subject: Re: FS Nye Viking MB-2 antenna coupler (tuner) Date: Thu, 29 Jun 2006 16:16:20 -0700 Message-ID: <12a8nq78q4u3bc5@corp.supernews.com> References: <1254uk1nj4fq0f4@corp.supernews.com> Decided not to sell... "Denton" wrote in message news:1254uk1nj4fq0f4@corp.supernews.com... >I have for sale a nye viking mb-3 antenna coupler, this is a pre nye viking >mb-va unit in good condition. No balun,internal antenna switching or >manual. Very big and heavy, construction is designed for probably well over >legal limit continous duty. Simply too big for my station. Will send pixs >on request. ship from Pendleton Or $300.00...well worth the price! > > Article: 102594 of rec.radio.amateur.boatanchors From: M.M. Subject: Raytheon 6SN7's Message-ID: Date: Thu, 29 Jun 2006 23:24:48 GMT I have a few raytheon 6SN7-GTB that are in matched quad packaging that were removed from various church organs. What are they used for and what are they worth? And guitar amos use these? Thanks ...M.M. Article: 102595 of rec.radio.amateur.boatanchors From: Straydog Subject: Re: SB-230 tuning Date: Thu, 29 Jun 2006 21:36:21 -0400 Message-ID: References: <1151423927.624377.232040@u72g2000cwu.googlegroups.com> On Thu, 29 Jun 2006, Chuck Harris wrote: > straydog wrote: > A bunch of stuff about Art Maxwell... His name is Walter Maxwell and I did use his name correctly. I also wrote a number of sentences about my experiences and I related all this to Craig's questions. >> Art, W4PON >> > > > Art, consider it this way, if you have high SWR, you are driving > a load that is the wrong impedance for your transmitter. If you read Walter Maxwell's articles, you would see that by his explanations the sentence you just wrote is wrong. Suppose > we were talking about an audio amplifier that was designed to drive > an 8 ohm speaker. I have measured the DC resistance of many 8 ohn speakers and they always show less than one ohm of DC resistance. If we drove a 1 ohm speaker, would you not expect > the audio amplifier to be over loaded? Would you care to specify what you are driving that "1 ohm speaker" with? DC, AC (complex waveform, sine waveform, square waveform)? Duty cycle? How much voltage? Would you care to specify whether that speaker is heavily coupled to the atmosphere or lightly coupled? If the speaker were in outer space, what "X ohms" would you expect it to be? Perhaps a little hot around > the collar? If we drove a 1000 ohm speaker, the amplifier would have > trouble generating enough voltage to get any significant power out to > the load. > > Art Maxwell I don't know any Art Maxwell, but the author that I talked about was Walter Maxwell. wanted to drive a low VSWR load because he was using > coaxial cable, and as the VSWR increases, the cable sees higher > voltages and currents inside of it than it will see at a 1:1 VSWR. Walter Maxwell included a substantial amount of historical information regarding the fact that amateurs used open wire feeders for decades before coax came out and that all these guys didn't know anything about SWR but when SWR was discovered, it was also discovered that all of these guys were very effectively communicating under conditions of very high SWR and the reason it didn't mean anything is tht open wire feeders have very low losses, generally even much lower than good coax. I have seen attenuation figures in the older editions of the Radio Handbook. Its true. > These higher voltages and currents will cause cable heating, and > a loss of power to the antenna. I once ran a 100 watt output 440 mhz brick amplifier to a 440 mhz beam with 1.2-1.1 SWR through a 50 foot length of RG-8/U on FM and the cable, during the course of a 30 minute two way QSO became a good 20 degrees warmer. > If one was using a high impedance ladder line type of transmission line, > it wouldn't much matter what the VSWR was, but not so for coax. According to Walter Maxwell, it does not have to be high impedance ladder/open wire. And, what does matter is that the transmission line, regardless of its characteristic impedance, be low loss. I think he is right. > -Chuck Harris > Article: 102596 of rec.radio.amateur.boatanchors From: kludge@panix.com (Scott Dorsey) Subject: Re: Raytheon 6SN7's Date: 30 Jun 2006 08:59:55 -0400 Message-ID: References: M.M. wrote: >I have a few raytheon 6SN7-GTB that are in matched quad packaging that >were removed from various church organs. What are they used for and >what are they worth? And guitar amos use these? Thanks ...M.M. They are common twin-triodes that appear in a lot of audio gear, including church organs. The Raytheon units tended to have more heater-to-cathode leakage problems than the other American types, but definitely have less than the modern Russian ones. Since the Russians currently make an excellent 6SN7, I think the market for old pulls is somewhat limited. But throw them up on Ebay and see if anyone bites. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." Article: 102597 of rec.radio.amateur.boatanchors From: "Charlie Hugg" Subject: FA Collins R-390/R-390A Parts and Radios Plus More Message-ID: Date: Fri, 30 Jun 2006 08:20:47 -0500 Please see my auctions for an Awesome Restored Amelco R-390A and most all parts to build a Collins R-390 Receiver, pluse much more vintage gear: http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZhugQ2daQ2dbug Thanks, Charlie Hugg, K5MBX See my Signal/One, Collins & Drake Photo Galleries and my Hallicrafters Virtual Museum at http://hug-a-bug.com Article: 102598 of rec.radio.amateur.boatanchors From: "Antonio Vernucci" References: Subject: Re: Raytheon 6SN7's Date: Fri, 30 Jun 2006 19:14:44 +0200 Message-ID: <44a55c06$0$5085$4fafbaef@reader2.news.tin.it> > I have a few raytheon 6SN7-GTB that are in matched quad packaging that > were removed from various church organs. What are they used for and > what are they worth? And guitar amos use these? Thanks ...M.M. Octal tubes of that age typically range 3 to 5 $ when new. But you are = lucky as the 6SN7 is one of the tube which falls in the "audio" = category. That is the category of the hi-fi aficioados who believe that = tube audio amplifiers are better than the solid state one, and are = prepared to pay quite a lot for them. That is the reason why US-made = 6SN7s are typically sold 15 to 20$ when new. I would advice to advertise your tubes on e-bay in the section dedicated = to hi-fi aficionados, not in the electronics one. The used audio tubes price could be close to that of new tubes, as those = people do not understand the difference too well. Insist on the fast = that the used ones are better than the new ones, as they have been = thoroughly tested. Stress a lot that they are matched, and that they are US made, not = coming from eastern countries.=20 Also, try to find some distinguishing feature of your tubes, like "dark = grey plates" or "brown socket" or "very bright label" etc. Moreover, state that the Raytheon 6SN7s are well known to produce the = warmest sound of all 6SN7s in the world.=20 Sell then in pairs, not in quartets. So doing, you may end up to 50$ a pair if you are lucky. Good luck Tony I0JX Article: 102599 of rec.radio.amateur.boatanchors Subject: Re: SB-230 tuning From: "JB" <1963@cybertime.net> Date: Fri, 30 Jun 2006 11:42:06 -0700 Message-ID: References: <1151423927.624377.232040@u72g2000cwu.googlegroups.com> <9aSdnX1pofc8Ej_ZnZ2dnUVZ_tGdnZ2d@adelphia.com> Reflected Power usually gets dissipated in the coax, but may result in unusual currents and voltages in the Plate output circuit and may not allow a proper load. Whatever your Amp or proceedure, Pi-network outputs require maximum loading. It results in maximum output = maximum efficiency = minimum harmonics and distortion. Even a minor loading misajustment results in a big rise in harmonics and distortion. Your Club tuneup routine is an excellent proceedure since you would be providing sufficient drive at peaks and If a peak reading meter were handy, very meaningful. CW at the 80-100 watts would also be useful but there is little need to lean on it for more than a couple of seconds while looking at meters and tweeking a knob. Always keep an eye on grid currents as they are the most fragile they will be metered if it matters in your Amp (or protected somehow). Once tuned to maximum output in this fashion, you can reduce drive, confident that the final stage is fully loaded. Do this with a 50 ohm Dummy load so that you will know what this is supposed to look like as it is easier to do a little tweeking on the air versus tune-up from scratch into an impossible load. "Straydog" wrote in message news:Pine.NEB.4.63.0606281119240.25558@panix3.panix.com... > > > On Wed, 28 Jun 2006, Roger D Johnson wrote: > > > Straydog wrote: > >> > > > > > >> because that reflected power will end up being dissipated in the > >> tube/heatsink. > > > > Another "Old Wives Tale"! Tubes are only "matched" to the point where > > the desired output is obtained. > > All depends on your definition of matched. > > Reflected power will see the amp as a > > mismatch and will again be reflected back towards the antenna. > > I think that is only partly true. Yes, there will be reflectd power going > back out to the antenna, but there was an article in QST back a number of > years ago. Yes, the mismatch also results in higher plate dissipation, > too. I will correct myself about reflected power being disipated in tube, > but the mismatch will increase the plate dissipation. The other issue is > being off plate resonance. I had my SB-230 trip the overtemp relay when I > moved frequency and did not retune the final. > > You also need to allow for loss in the transmission line. Not all of what > gets reflected at the mismatches ends up at the other end of the > transmission line. SWR (i.e. reflected power generated at the > antenna/feedline) would not be a problem if the transmission line > were long and lossy. > > > 73, Roger > > > > -- > > Remove tilde (~) to reply > > > > Remember the USS Liberty (AGTR-5) > > http://ussliberty.org/ > > Article: 102600 of rec.radio.amateur.boatanchors From: Straydog Subject: Re: SB-230 tuning Date: Fri, 30 Jun 2006 18:02:39 -0400 Message-ID: References: <1151423927.624377.232040@u72g2000cwu.googlegroups.com> On Fri, 30 Jun 2006, Roger D Johnson wrote: > JB wrote: >> Reflected Power usually gets dissipated in the coax, but may result in >> unusual currents and voltages in the Plate output circuit and may not allow >> a proper load. > > Why would reflected power be any more dissipated than forward power? I would ask the same question. Or, if you had 100 watts going forward from the transmiter end of the coax on a 100 feet of 3 db loss/100 foot coax, then there is only 50 watts at the end of the coax. If half of that gets reflected (i.e. 25 watts coming back) from ant-coax mismatch, then it suffers another 3 db loss by the time it gets back to the entry point on the coax (or, 12.5 watts +/-). At the transmitter end, Roger and I are having substantial discussions by private email. > 73, Roger > > -- > Remove tilde (~) to reply > > Remember the USS Liberty (AGTR-5) > http://ussliberty.org/ >