Article: 93523 of rec.radio.amateur.homebrew From: "Mike Andrews" Subject: Re: IF question Date: Fri, 1 Jul 2005 14:30:11 +0000 (UTC) Message-ID: References: <1120227004.611121.212400@g43g2000cwa.googlegroups.com> pdrunen@aol.com wrote: > Hi Group, > Radios like my FT-757 and FT-101 have an IF output. If I take this > output to a spectrum analyizer and the SA center frequency is set the > same as the IF frequency, will I have a spectrum monitor which will > display over the complete bandwidth? > If so, is the BW of an IF generally large enought to view the complete > band? You'll see the IF bandwidth if the SA is set that wide or wider; otherwise, you'll just see the SA bandwidth. Most receiver IF bandwidths aren't particularly wide; some are, but they're designed for it. The receiver specs may (and, IIRC, typically do) show IF bandwidth. -- On a Tee-shirt: "I am a bomb technician. If you see me running, try to keep up. " Article: 93524 of rec.radio.amateur.homebrew From: MAc Subject: Re: PIC SWR meter - help!!!!!!!!!! Date: Fri, 01 Jul 2005 17:20:57 +0200 Message-ID: References: <1120210351.445890.104610@g43g2000cwa.googlegroups.com> Leszek, który numer qst?. Powinienem mieć w archiwach MAc sp9mrn Article: 93525 of rec.radio.amateur.homebrew From: Win Subject: SB-200 QSK Mod Date: Fri, 01 Jul 2005 14:22:31 -0500 Message-ID: <9t5bc1l3bjued6ds6trn6bensdpuvgabse@4ax.com> I am interesting in a good layout for this mod. Any food ideas out there? Win, w0lz Article: 93526 of rec.radio.amateur.homebrew From: Win Subject: Re: SB-200 QSK Mod Date: Fri, 01 Jul 2005 14:27:43 -0500 Message-ID: References: <9t5bc1l3bjued6ds6trn6bensdpuvgabse@4ax.com> Make that "good ideas". Thats what I get working without glasses. Win, w0lz On Fri, 01 Jul 2005 14:22:31 -0500, Win wrote: >I am interesting in a good layout for this mod. Any food ideas out >there? > >Win, w0lz Article: 93527 of rec.radio.amateur.homebrew From: "DOUGLAS SNOWDEN" Subject: SB-200 transformer(new) $75 + shipping Message-ID: Date: Fri, 01 Jul 2005 23:38:28 GMT This is an export transformer, meaning it is set up for 100 volts or so primary voltage. I was planning on using the HV section on 115volts for a single tube 3-500Z amp but have not gotten around to it. Wires have not been soldered - brand new. Doug, N4IJ Article: 93528 of rec.radio.amateur.homebrew From: Mike M. Subject: Re: Yaesu FT-8800R Message-ID: References: Date: Sat, 02 Jul 2005 07:09:35 GMT On Thu, 30 Jun 2005 22:32:24 GMT, "Clinton" wrotF: >Does anyone have a schematic for the FT-8800R computer interface cable? > >Thanks >VE7KNL >--- >Remove _nospam_ to reply via email. > > There are a couple here, the FT-8800R and FT8900 use the same cable. You'll have to join the group to access the files section. http://groups.yahoo.com/group/FT-8900/files/ Article: 93529 of rec.radio.amateur.homebrew From: "Clinton" References: Subject: Re: Yaesu FT-8800R Message-ID: Date: Sat, 02 Jul 2005 11:54:21 GMT Already done and got the info I was looking for. Thanks. --- Remove _nospam_ to reply via email. "Mike M." wrote in message news:t8fcc1dbketd6j87ohlpklk4t9v32oag2j@4ax.com... > On Thu, 30 Jun 2005 22:32:24 GMT, "Clinton" > wrotF: > >>Does anyone have a schematic for the FT-8800R computer interface cable? >> >>Thanks >>VE7KNL >>--- >>Remove _nospam_ to reply via email. >> >> > > There are a couple here, the FT-8800R and FT8900 use the same cable. > You'll have to join the group to access the files section. > > http://groups.yahoo.com/group/FT-8900/files/ > Article: 93530 of rec.radio.amateur.homebrew From: "Heytubeguy" Subject: FA:TUBES:811, 572B,5U4,12BH7..+MO Message-ID: Date: Sat, 02 Jul 2005 12:43:51 GMT Have 811A, 572B, 5U4 rectifiers + a few others and more coming after the 4th; see at: http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy Tnx and Happy Birthday America, heytubeguy Article: 93531 of rec.radio.amateur.homebrew From: Win Subject: Re: SB-200 QSK Mod Date: Sat, 02 Jul 2005 08:16:07 -0500 Message-ID: <4e4dc1t7iirohnb57g00g7g7rpp78fca9q@4ax.com> References: <9t5bc1l3bjued6ds6trn6bensdpuvgabse@4ax.com> On Fri, 1 Jul 2005 22:59:00 -0500, "gb" wrote: >"Win" wrote in message >news:9t5bc1l3bjued6ds6trn6bensdpuvgabse@4ax.com... >>I am interesting in a good layout for this mod. Any food ideas out >> there? >> >> Win, w0lz > >Win - > >Well, first you need some good RF relays for QSK. >You can use vacuum relays (Kilovac or Jennings) - MaxGain; Surplus Sales or >Fair Radio Sales >http://www.mgs4u.com/relay.htm >http://www.surplussales.com/Relays/REVacRel-1.html > >and/or a fast RF reed relay like the Matsushita 1mS device. >http://www.somis.org/ > >w9gb > Thanks, Greg. Actually I picked up the relays and other parts from Richard (somis.org). Now I am just thinking about where I will put the circuits. I am thinking about putting most behind the meters over the filiment transformer, and those associated with the relays under the chassis where the old relay will be removed. I was just looking for ideas from those who had layed this out before me in this amp. Read your QRZ bio. Me, too, 40 meters CW........... Thanks Win,/w0lz Article: 93532 of rec.radio.amateur.homebrew From: "K9YA" Subject: FREE Subscription to Ham Radio e-Zine - K9YA Telegraph Message-ID: Date: Sat, 02 Jul 2005 16:48:45 GMT Check out the latest issue of the K9YA Telegraph: Fishing for QSOs By Philip Cala-Lazar, K9PL My Lucky Dayton Trip By Steve Wolfcale, N9WAT Ham Radio and Scouting By Art Steinke, WB9JKY, trustee, W9BSA They Could Have and Should Have By Rod Newkirk, VA3ZBB/W9BRD Liverpool's Skyline to Flash Morse Code Messages Morse Tips & Quips Subscribe for FREE at http://www.k9ya.org Article: 93533 of rec.radio.amateur.homebrew From: Win Subject: Re: SB-200 QSK Mod Date: Sat, 02 Jul 2005 13:47:04 -0500 Message-ID: <1rmdc1tt7mmc07j8fi3egdcofa3rrboatg@4ax.com> References: <9t5bc1l3bjued6ds6trn6bensdpuvgabse@4ax.com> <4e4dc1t7iirohnb57g00g7g7rpp78fca9q@4ax.com> Richard did an article in QSt many years ago on QSK for the SB-200. But, as I am sure you know, Ameritron is well represented at the ARRL. Somehow that articke is no longer in the archive. >Well 40 meter CW is where I started over 30 years ago .. >when the Novice band was 7.15 to 7.20 !! Can't wait till the broadcasters >will move -- will be a first class early evening DX band (sans static!) > >I did see a couple of Internet web pages with the conversion -- but those >web pages are now gone - I'll keep an eye open. I think Richard did do a >conversion on an earlier SB-200 ... you may also want to look at the >Ameritron/MFJ QSK-5 PIN diode internal board approach (for ideas how or how >not to do it). >http://www.ameritron.com/man/pdf/QSK-5PC.pdf > >w9gb Richard did an article in QST many years ago on QSK for the SB-200. But, as I am sure you know, Ameritron is now well represented at the ARRL. Somehow that articke is no longer in the archive. I guess articles on modifications to old amplifiers does not sell new amplifiers. Anyway, I think I have it figured out. Both of the connections to the cathode bias swicth will be on the HV power supply board. I will just place my circuit in proximity to that board. I will place the relays where the old RF relay was. Should you come across anything, I would like to see it, though. In the early 60s I was rock bound to a DX-60 on a 40 meter dipole. The receiver was an SX-101. I remember having a cigar box of rocks, and tuning up and down the band after every call. It was a big thing when I got my first, not so stable, VFO. But, looking back, those were great days. I don't get the kinds of QSOs today I did back then. Thanks again Win, w0lz > Article: 93534 of rec.radio.amateur.homebrew From: "clfe" References: <1120327711.623121.41760@g49g2000cwa.googlegroups.com> Subject: Re: recharable soldering iron Message-ID: Date: Sat, 2 Jul 2005 16:34:25 -1200 "m005kennedy" wrote in message news:1120327711.623121.41760@g49g2000cwa.googlegroups.com... >I usually do a small amout of soldering at once. I was thinking of > getting a recharable soldering iron just for the convience factor. I > was hoping to get a brand and supplier recomendation. I've seen them > for around $60. I would think they would be fine for QRP type > construction. > > Mike > KB1IUI > I have two of them, picked them both up at a hamfest for $5 each. Though they needed batteries and a tip, they - to me - were a steal. All included, I got both for less than the price of one - new. I use mine extensively at times and got them for times when I'm trying to do repair work when no immediate electric source OR as is my luck, a damned storm comes and knocks out the power. At least with the Cordless, I can keep on working. Most of my work involves only a DMM and Soldering equipment, anything else can wait til power is available. I was able to get "very" small tips for the really fine soldering I do at times, saved me lots of grief. These are Iso-Tip brand. Very easy to maintain too. Not much to go wrong with them. Tip and batteries - two major parts, aside from the transformer in the charging base. Even if ya have to buy one brand new, go for it....... "I" feel you'll make a good choice. Before I close out - I "do" hope you're referring to the "hot" kind, not the cold!!!!! The cold are JUNK. clf Article: 93535 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: recharable soldering iron Date: Sat, 02 Jul 2005 15:13:51 -0700 Message-ID: <11ce4d1ftdfska1@corp.supernews.com> References: <1120327711.623121.41760@g49g2000cwa.googlegroups.com> Years ago, Wahl (the hair clipper company) made one that was small, lightweight, quite well made, and one that should suit your purpose very well. You might check to see if they still make it. I wanted a portable iron for outdoor soldering but it didn't have enough moxie for outdoor antenna work. A butane iron is much better for that purpose. Roy Lewallen, W7EL m005kennedy wrote: > I usually do a small amout of soldering at once. I was thinking of > getting a recharable soldering iron just for the convience factor. I > was hoping to get a brand and supplier recomendation. I've seen them > for around $60. I would think they would be fine for QRP type > construction. > > Mike > KB1IUI > Article: 93536 of rec.radio.amateur.homebrew From: StarzAndStripes92999999@earthlink.net (Starz and Stripes) Subject: How do you measure impedance a broadband transformer? Message-ID: <42c73578.200999@news.verizon.net> Date: Sun, 03 Jul 2005 00:50:56 GMT How do you measure the impedance of a broadband transformer for a RF transistor amplifier? I'm referring to the input and output broadband tranformers just before and after the transistor finals. Article: 93537 of rec.radio.amateur.homebrew Date: Sat, 02 Jul 2005 21:13:55 -0400 From: -ex- Subject: Re: recharable soldering iron References: <1120327711.623121.41760@g49g2000cwa.googlegroups.com> Message-ID: <3b625$42c73bd6$4232bd90$21751@COQUI.NET> Highland Ham wrote: > However for surface mount components you need a micro tip. For this type of > work I use an electric cordless iron powered by 2 pcs 1.2V NiCad batteries. > But after a number of joints the batteries must be charged by placing the > complete iron in a stand . The unit I use is called ISOTIP ,made in USA by > Wahl Clipper Corporation. > The iron was purchased in 1980 and used regularly ,however the charger is > very primative (just a transformer with an embedded diode in the secondary > low voltage winding), resulting in relatively short battery life . I now > use the iron with a homebrew charger permitting 2 selectable charge rates > being 300 and 10 mA , the first used while using the iron , the 10 mA rate > when idle (trickle charging). Now the batteries hold their charge well and > the iron is ready for use at all times . Battery replacement however is > awkward . > > Frank GM0CSZ / KN6WH That sounds like the one I had in the 80's. It soldered well enough but didn't have enough gas in the battery tank to do any very serious work. If it were to be used regularly Frank's comments about a trickle charger are worth noting. -Bill Article: 93538 of rec.radio.amateur.homebrew Message-ID: <42C76BE8.59F865DA@earthlink.net> From: "Michael A. Terrell" Subject: Re: recharable soldering iron References: <1120327711.623121.41760@g49g2000cwa.googlegroups.com> Date: Sun, 03 Jul 2005 04:40:14 GMT clfe wrote: > > "m005kennedy" wrote in message > news:1120327711.623121.41760@g49g2000cwa.googlegroups.com... > >I usually do a small amout of soldering at once. I was thinking of > > getting a recharable soldering iron just for the convience factor. I > > was hoping to get a brand and supplier recomendation. I've seen them > > for around $60. I would think they would be fine for QRP type > > construction. > > > > Mike > > KB1IUI > > > > I have two of them, picked them both up at a hamfest for $5 each. Though > they needed batteries and a tip, they - to me - were a steal. > All included, I got both for less than the price of one - new. I use mine > extensively at times and got them for times when I'm trying to do repair > work when no immediate electric source OR as is my luck, a damned storm > comes and knocks out the power. At least with the Cordless, I can keep on > working. Most of my work involves only a DMM and Soldering equipment, > anything else can wait til power is available. I was able to get "very" > small tips for the really fine soldering I do at times, saved me lots of > grief. These are Iso-Tip brand. Very easy to maintain too. Not much to go > wrong with them. Tip and batteries - two major parts, aside from the > transformer in the charging base. > > Even if ya have to buy one brand new, go for it....... "I" feel you'll make > a good choice. Before I close out - I "do" hope you're referring to the > "hot" kind, not the cold!!!!! The cold are JUNK. > > clf Add a 1N4000 (or similar small power) diode in series with the lamp to extend the life. I was replacing the bulb every couple weeks, till I did this. -- Former professional electron wrangler. Michael A. Terrell Central Florida Article: 93539 of rec.radio.amateur.homebrew Message-ID: <42C76D2B.C827CD4B@earthlink.net> From: "Michael A. Terrell" Subject: Re: recharable soldering iron References: <1120327711.623121.41760@g49g2000cwa.googlegroups.com> <3b625$42c73bd6$4232bd90$21751@COQUI.NET> Date: Sun, 03 Jul 2005 04:45:38 GMT -ex- wrote: > > That sounds like the one I had in the 80's. It soldered well enough but > didn't have enough gas in the battery tank to do any very serious work. > If it were to be used regularly Frank's comments about a trickle > charger are worth noting. > > -Bill I had the Wahl orange, eight hour charge version. I added a switch to the primary of the transformer to turn it off at night. It rarely ran down in normal, day to day use, and I worked at least 40 hours a week with it and a couple other irons on my bench. PS: The first version was gray and took 16 to 24 hours to charge. The orange model came next, followed by the red, one hour charge model. Of course, it came out the week after I bought the orange one. :( -- Former professional electron wrangler. Michael A. Terrell Central Florida Article: 93540 of rec.radio.amateur.homebrew Date: Sun, 03 Jul 2005 01:01:32 -0400 From: -ex- Subject: Re: recharable soldering iron References: <1120327711.623121.41760@g49g2000cwa.googlegroups.com> <3b625$42c73bd6$4232bd90$21751@COQUI.NET> <42C76D2B.C827CD4B@earthlink.net> Message-ID: <5ae6b$42c7712d$4232bda0$7572@COQUI.NET> Michael A. Terrell wrote: > > I had the Wahl orange, eight hour charge version. I added a switch > to the primary of the transformer to turn it off at night. It rarely > ran down in normal, day to day use, and I worked at least 40 hours a > week with it and a couple other irons on my bench. You should have kept that one. -Bill Article: 93541 of rec.radio.amateur.homebrew Message-ID: <42C78156.3773CABA@earthlink.net> From: "Michael A. Terrell" Subject: Re: recharable soldering iron References: <1120327711.623121.41760@g49g2000cwa.googlegroups.com> <3b625$42c73bd6$4232bd90$21751@COQUI.NET> <42C76D2B.C827CD4B@earthlink.net> <5ae6b$42c7712d$4232bda0$7572@COQUI.NET> Date: Sun, 03 Jul 2005 06:11:43 GMT -ex- wrote: > > Michael A. Terrell wrote: > > > > > I had the Wahl orange, eight hour charge version. I added a switch > > to the primary of the transformer to turn it off at night. It rarely > > ran down in normal, day to day use, and I worked at least 40 hours a > > week with it and a couple other irons on my bench. > > You should have kept that one. > > -Bill I did, for about 12 years. Finally, the transformer went bad, and the third battery pack shorted out. It was starting to develop cracks in the iron's body, so I reluctantly salvaged the only good parts, the diode and the bulb. -- Former professional electron wrangler. Michael A. Terrell Central Florida Article: 93542 of rec.radio.amateur.homebrew From: "clfe" References: <1120327711.623121.41760@g49g2000cwa.googlegroups.com> <42C76BE8.59F865DA@earthlink.net> Subject: Re: recharable soldering iron Message-ID: Date: Sun, 3 Jul 2005 03:33:09 -1200 "Michael A. Terrell" wrote in message news:42C76BE8.59F865DA@earthlink.net... > clfe wrote: >> >> "m005kennedy" wrote in message >> news:1120327711.623121.41760@g49g2000cwa.googlegroups.com... >> >I usually do a small amout of soldering at once. I was thinking of >> > getting a recharable soldering iron just for the convience factor. I >> > was hoping to get a brand and supplier recomendation. I've seen them >> > for around $60. I would think they would be fine for QRP type >> > construction. >> > >> > Mike >> > KB1IUI >> > >> >> I have two of them, picked them both up at a hamfest for $5 each. Though >> they needed batteries and a tip, they - to me - were a steal. >> All included, I got both for less than the price of one - new. I use mine >> extensively at times and got them for times when I'm trying to do repair >> work when no immediate electric source OR as is my luck, a damned storm >> comes and knocks out the power. At least with the Cordless, I can keep on >> working. Most of my work involves only a DMM and Soldering equipment, >> anything else can wait til power is available. I was able to get "very" >> small tips for the really fine soldering I do at times, saved me lots of >> grief. These are Iso-Tip brand. Very easy to maintain too. Not much to go >> wrong with them. Tip and batteries - two major parts, aside from the >> transformer in the charging base. >> >> Even if ya have to buy one brand new, go for it....... "I" feel you'll >> make >> a good choice. Before I close out - I "do" hope you're referring to the >> "hot" kind, not the cold!!!!! The cold are JUNK. >> >> clf > > > Add a 1N4000 (or similar small power) diode in series with the lamp > to extend the life. I was replacing the bulb every couple weeks, till I > did this. > > -- > Former professional electron wrangler. > > Michael A. Terrell > Central Florida Hmmmm... thanks for the tip, but as yet, I've not had this issue. But, no sense waiting for it to happen. I'll do that. Thanks again, clfe Article: 93543 of rec.radio.amateur.homebrew From: "Heytubeguy" Subject: FA:TUBES Added: 6SN7GTB, 6V6Y, 5691 Message-ID: Date: Mon, 04 Jul 2005 00:20:41 GMT A few more tubes types added include 6SN7GTB, 6V6Y, 5691; see at: http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy Tnx for looking, Happy Birthday America, heytubeguy Article: 93544 of rec.radio.amateur.homebrew From: "David J Windisch" References: <1120327711.623121.41760@g49g2000cwa.googlegroups.com> Subject: Re: Rechargeable soldering irons (Wahl) Message-ID: Date: Mon, 04 Jul 2005 10:23:09 GMT Hi, all concerned: I have 3 old, well-used Wahl rechargeables and charger-holders: 2 black "slow charge" units, and one orange "fast charge" unit. I used the beejeebers out of them in my spare-time-electronic-repairs-shop days. New Wahl tips, batteriesamerica.com replacement solder-tab nimh C-cells, and some charger mods to work around the evils mentioned below, would rejuvenate them nicely. Best offer gets the lot, and pls include $6 for shipping in your offer. Tks for reading. 73, Dave, N3HE SNIP >> the complete iron in a stand . The unit I use is called ISOTIP ,made in >> USA by Wahl Clipper Corporation. >> The iron was purchased in 1980 and used regularly ,however the charger is >> very primative (just a transformer with an embedded diode in the >> secondary low voltage winding), resulting in relatively short battery >> life . I now use the iron with a homebrew charger permitting 2 >> selectable charge rates being 300 and 10 mA , the first used while using >> the iron , the 10 mA rate when idle (trickle charging). Now the batteries >> hold their charge well and the iron is ready for use at all times . >> Battery replacement however is awkward . >> Frank GM0CSZ / KN6WH >> > Wahl Corporation's HQ is about 100 miles due west of my QTH (outside of > Chicago). > http://www.iso-tip.com/html/soldering_irons.htm > > They sell both the Iso-Tip cordless as well as an EZ Change model > Here are the web pages: > http://www.iso-tip.com/html/cordless_irons.htm > http://www.iso-tip.com/html/iso_tip_accessories.htm > http://www.iso-tip.com/html/ez_change.htm > > They also sell a line of butane irons > http://www.iso-tip.com/html/butane_irons.htm > SNIP Article: 93545 of rec.radio.amateur.homebrew From: Steve Subject: Re: WTB "The VHF/UHF DX Book Edited by Ian White, G3SEK" References: <1120119724.168589.257130@f14g2000cwb.googlegroups.com> <17atAqTWI+wCFAnF@ifwtech.co.uk> Message-ID: Date: Mon, 04 Jul 2005 17:31:54 GMT Ian White GM3SEK wrote: > MarkAren wrote: > >> Hi All, >> >> Anyone got a copy in good condition for sale ? >> >> Ian, got a spare copy ? >> > > Sorry, not any more. Good luck! > > Ian, It is a brilliant book. My "dog-eared" copy is now falling to pieces through overuse;-( I suppose that times have changed and a reprint is now out of the question. Would you, or any of the contributors, object to somebody putting it up on the internet, i.e. as PDF files in the same way as the Classic EIMAC "Care and feeding of power grid tubes" is? Best wishes and thanks for "The Book"! Steve G8IZY Article: 93546 of rec.radio.amateur.homebrew From: Tim Wescott Subject: Re: Unknown Component Date: Mon, 04 Jul 2005 11:28:42 -0700 Message-ID: <11civugrsqdb09a@corp.supernews.com> References: Win wrote: > Pulled a high speed vacuum relay, Jennings RJ1A, out the other day > that I was saving for a QSK mod to my old amp. There is component > across the windings of this relay that I can not identify. It is > soldered, or silver soldered, to the winding terminals. It is about > 3/16 square, yellow, and has the following markings: JAVX 8652 AA M390 > 14/01 1553. > > Here is a slightly out of focus picture. > http://home.alltel.net/winlyn/RJ1A.jpg > > Anyone????? > > Win, W0LZ It's a rectangular ceramic cap, _possibly_ 39pF ('cause of the "M390" marking). Those things have military catalog numbers and don't necessarily include the actual value printed on the cap, which is a pain if you have a mixed bag of them, or if you have one on a board and want to know it's value. -- ------------------------------------------- Tim Wescott Wescott Design Services http://www.wescottdesign.com Article: 93547 of rec.radio.amateur.homebrew From: Win Subject: Re: Unknown Component Date: Mon, 04 Jul 2005 15:43:14 -0500 Message-ID: References: <11civugrsqdb09a@corp.supernews.com> On Mon, 04 Jul 2005 11:28:42 -0700, Tim Wescott wrote: >Win wrote: > >> Pulled a high speed vacuum relay, Jennings RJ1A, out the other day >> that I was saving for a QSK mod to my old amp. There is component >> across the windings of this relay that I can not identify. It is >> soldered, or silver soldered, to the winding terminals. It is about >> 3/16 square, yellow, and has the following markings: JAVX 8652 AA M390 >> 14/01 1553. >> >> Here is a slightly out of focus picture. >> http://home.alltel.net/winlyn/RJ1A.jpg >> >> Anyone????? >> >> Win, W0LZ > >It's a rectangular ceramic cap, _possibly_ 39pF ('cause of the "M390" >marking). Those things have military catalog numbers and don't >necessarily include the actual value printed on the cap, which is a pain >if you have a mixed bag of them, or if you have one on a board and want >to know it's value. Thanks, Tim. I think you are correct. Rich Measures, KG6K, said it could be an MOV, which is a capacitive device.. What eve it is, exactly, I think I am going to leave it in the circuit. I can't see it hurting anything. win, w0lz Article: 93548 of rec.radio.amateur.homebrew From: "Pete KE9OA" References: <11civugrsqdb09a@corp.supernews.com> Subject: Re: Unknown Component Message-ID: Date: Tue, 05 Jul 2005 07:06:52 GMT It is a cap. I've got plenty of those things from thr Collins surplus sales. Pete "Win" wrote in message news:jf7jc1trub7va6qe5hq110oaqev5q6n4rt@4ax.com... > On Mon, 04 Jul 2005 11:28:42 -0700, Tim Wescott > wrote: > >>Win wrote: >> >>> Pulled a high speed vacuum relay, Jennings RJ1A, out the other day >>> that I was saving for a QSK mod to my old amp. There is component >>> across the windings of this relay that I can not identify. It is >>> soldered, or silver soldered, to the winding terminals. It is about >>> 3/16 square, yellow, and has the following markings: JAVX 8652 AA M390 >>> 14/01 1553. >>> >>> Here is a slightly out of focus picture. >>> http://home.alltel.net/winlyn/RJ1A.jpg >>> >>> Anyone????? >>> >>> Win, W0LZ >> >>It's a rectangular ceramic cap, _possibly_ 39pF ('cause of the "M390" >>marking). Those things have military catalog numbers and don't >>necessarily include the actual value printed on the cap, which is a pain >>if you have a mixed bag of them, or if you have one on a board and want >>to know it's value. > > Thanks, Tim. I think you are correct. Rich Measures, KG6K, said it > could be an MOV, which is a capacitive device.. What eve it is, > exactly, I think I am going to leave it in the circuit. I can't see > it hurting anything. > > win, w0lz > Article: 93549 of rec.radio.amateur.homebrew Message-ID: <42CABA5A.35002C15@earthlink.net> From: "Michael A. Terrell" Subject: Re: Looking for Specialty Crystal Filter, Please Help References: <1120577431.428234.246660@g14g2000cwa.googlegroups.com> Date: Tue, 05 Jul 2005 16:50:52 GMT ZenSafari wrote: > > I am currently looking for a crystal filter in the CF range of 70 to > 100MHz. I know that these are rare and are not standard for FM radio, > citizen's band, etc, but it would be most helpful for me to find one. > Ideally, the filter should have a passpand of +/-3.75kHz about the CF > (3dB). I've checked numerous manuf. who make these type of crystal > filters (FOX, ILSI, Raltron, MCF, etc) but most of their products are > vapor ware and have never been fabricated. Do any of you have a > suggestion of where I might find a filter that meets this spec? My goal > is to avoid another IF stage in my hardware...this is why I require the > narrow bandwidth at the high CF. Even if you have a suggestion of where > I might find a 70 to 100 MHz CF filter with a wider bandwidth I would > appreciate it very much. > > Thanks for the help. The only off the shelf 70 MHz CF filters I've seen were used in Satellite TV or Telemetry receivers. Microdyne built their own IF filters For narrow frequencies like this, with switching to select one of up to 12 internal bandwidths, and a few models allowed 12 external filters, as well. The SAW filters for Satellite receivers is generally +/- 10 MHz, so those won't help you. Its too bad, because there are old C-band and early KU band junkers almost everywhere. -- http://home.earthlink.net/~computersforvets/ Michael A. Terrell Central Florida Article: 93550 of rec.radio.amateur.homebrew From: fmmck@aol.com (Fred McKenzie) Subject: Re: Looking for Specialty Crystal Filter, Please Help Date: Tue, 05 Jul 2005 14:57:04 -0400 Message-ID: References: <1120577431.428234.246660@g14g2000cwa.googlegroups.com> In article <1120577431.428234.246660@g14g2000cwa.googlegroups.com>, "ZenSafari" wrote: > I am currently looking for a crystal filter in the CF range of 70 to > 100MHz. I know that these are rare and are not standard for FM radio, > citizen's band, etc, but it would be most helpful for me to find one. > Ideally, the filter should have a passpand of +/-3.75kHz about the CF > (3dB). I've checked numerous manuf. who make these type of crystal > filters (FOX, ILSI, Raltron, MCF, etc) but most of their products are > vapor ware and have never been fabricated. Do any of you have a > suggestion of where I might find a filter that meets this spec? My goal > is to avoid another IF stage in my hardware Chris- I recall such a product from about 25 years ago, but for the 155-165 MHz range and somewhat wider bandwidth. It was from: PTI - Piezo Technology, Inc. http://www.piezotech.com/ 2525 Shader Road Orlando, FL 32804 USA Phone: 407-298-2000 Fax: 407-293-2979 It might be worth contacting them, in case they still make the filters, and can make them for your frequencies and bandwidth. 73, Fred, K4DII Article: 93551 of rec.radio.amateur.homebrew From: "Harold E. Johnson" References: <1120577431.428234.246660@g14g2000cwa.googlegroups.com> <42CABA5A.35002C15@earthlink.net> Subject: Re: Looking for Specialty Crystal Filter, Please Help Message-ID: <0MAye.134925$xm3.81103@attbi_s21> Date: Tue, 05 Jul 2005 18:59:08 GMT > ZenSafari wrote: > > > > I am currently looking for a crystal filter in the CF range of 70 to > > 100MHz. I know that these are rare and are not standard for FM radio, > > citizen's band, etc, but it would be most helpful for me to find one. > > Ideally, the filter should have a passpand of +/-3.75kHz about the CF > > (3dB). I've checked numerous manuf. who make these type of crystal > > filters (FOX, ILSI, Raltron, MCF, etc) but most of their products are > > vapor ware and have never been fabricated. Do any of you have a > > suggestion of where I might find a filter that meets this spec? My goal > > is to avoid another IF stage in my hardware...this is why I require the > > narrow bandwidth at the high CF. Even if you have a suggestion of where > > I might find a 70 to 100 MHz CF filter with a wider bandwidth I would > > appreciate it very much. I have a couple of the Ten Tec filters that were used in their Paragon transceiver. 70 MHz center frequency, don't remember the bandwidth but could measure one. Or you could check with Ten Tec and if it fits your requirements, they're available. W4ZCB Article: 93552 of rec.radio.amateur.homebrew From: "xpyttl" References: <1120577431.428234.246660@g14g2000cwa.googlegroups.com> <1120597023.483821.119790@g49g2000cwa.googlegroups.com> Subject: Re: Looking for Specialty Crystal Filter, Please Help Message-ID: Date: Wed, 6 Jul 2005 06:48:59 -0400 "ZenSafari" wrote in message news:1120597023.483821.119790@g49g2000cwa.googlegroups.com... > Thank you all for your replies. These leads are extremely helpful to > me. I will look into some of these options and get back to you. I think we would all be interested in what you discover. My own reaction is that you're not going to find something that narrow at that IF, but if you do, it might be useful in other contexts. .. Article: 93553 of rec.radio.amateur.homebrew From: "AAA RF Products" Subject: New Coax Connector & Adapter Catalog Now Available Message-ID: Date: Wed, 6 Jul 2005 06:36:25 -0700 Please email or call for your free copy of our latest coax connector, adapter, cable assembly & bulk coaxial cable catalog. No minimum order No handling fees. web: www.aaarfproducts.com email: sales@aaarfproducts.com call: 949 481 3154 fax: 949 388 5448 mail: AAA RF Products, 949 Calle Amanecer, San Clemente, CA 92673 USA Article: 93554 of rec.radio.amateur.homebrew From: "Ham Radio" Subject: Ham radio beginner? Message-ID: Date: Wed, 06 Jul 2005 16:03:05 GMT If you want to get into ham radio and don't know how to start, check out: http://www.hamradiostarter.com You will find everything you need to get your license and get started in ham radio. Article: 93555 of rec.radio.amateur.homebrew From: "JB" Subject: Re: Polarity of 2SC1970 and 2SC1971 Date: Wed, 6 Jul 2005 11:24:31 -0700 Message-ID: References: <1120597181.354388.75450@g47g2000cwa.googlegroups.com> Scary! I have noticed some with tabs isolated and some not. Gotta check the spec sheets. NTE replacements worked fine in TS2000 and are probably re-marked OEMs. Analog VOM would help. "Highland Ham" wrote in message news:TfqdnZBhmrm9nlbfRVnysg@pipex.net... > > Two RF transistors, 2SC1970 and 2SC1971 are supposed to have BEC > > pinouts according to data sheets. However, it seems that such > > transistors with BCE pinout also exist; resistors in one circuit caught > > on-fire when I plugged a 2SC1971 into a BEC socket (based on data > > sheets, I assumed the transistor had BEC pinout). After replacing the > > resistors and bending the leads of the transistor, the circuit worked > > properly. Yes, the socket was wired correctly for BEC pinout. Has > > anyone ever come across the BCE pinout versions of 2SC1970 and/or > > 2SC1971? > ================================== > According to Tower's International Transistor Selector , both 2SC1970 (Ic > max=0.5A) and 2SC1971 (Ic max =1A) are NPN RF power transistors in a TO220 > package > Pinout 2SC1970 is BCE > Pinout 2SC1971 is BEC > > The above pinouts are confirmed by the (PDF format) datasheets which I found > by doing a Google. > > Frank GM0CSZ / KN6WH > > Article: 93556 of rec.radio.amateur.homebrew From: "Bill Smith" References: <42BBFBB7.20706@nrao.edu> Subject: Re: How big has Somerset, PA hamfest been in the past? Date: Wed, 6 Jul 2005 16:07:14 -0400 Message-ID: <42cc39e2$0$52206$ec3e2dad@news.usenetmonster.com> "straydog" wrote in message news:Pine.NEB.4.62.0506261856170.28426@sdf.lonestar.org... > > > On Fri, 24 Jun 2005, Galen Watts wrote: > >> Date: Fri, 24 Jun 2005 08:25:27 -0400 >> From: Galen Watts >> To: straydog >> Newsgroups: rec.radio.swap, rec.radio.amateur.boatanchors, >> rec.radio.amateur.equipment, rec.radio.amateur.homebrew >> Subject: Re: How big has Somerset, PA hamfest been in the past? >> >> straydog wrote: >>> >>> I think July 17, is the next Somerset PA hamfest and I've been thinking >>> about going. Its a long drive from here (southern Delaware) and I was >>> wondering how big and how good it has been in the past. Anyone got any >>> recollections from the past? >>> >>> Art, w4pon >> >> They have pictures of last year's fest at >> http://www.k3smt.org/hf2004/ >> >> -W8LNA >> > > Thanks for the info... > > I had a look. > > W4PON > > Hello Art, This is only our second annual hamfest. Last year it was held in August, a day after the hurricane came thru. Our turnout was only about 300. Feedback so far this year says we should have between 500-750. Good odds for winning a door prize or the main drawing. Worst case, we're only 6 miles from the 9/11 Flight 93 Crash Site / Memorial. That in itself would make the trip worth it. The Somerset Somerfest is also running from Friday thru Sunday. Food, Music, Fun... I should work for the Chamber of Commerce...HiHi Hope to see you here. Bill kb3gun http://www.k3smt.org Article: 93557 of rec.radio.amateur.homebrew From: "Roger Conroy" Subject: Re: Ham radio beginner? Date: Wed, 6 Jul 2005 23:04:49 +0200 Message-ID: References: "Ham Radio" wrote in message news:ZgTye.9708$H41.660@tornado.rdc-kc.rr.com... > If you want to get into ham radio and don't know how to start, check out: > > http://www.hamradiostarter.com > > You will find everything you need to get your license and get started in > ham > radio. > > Why pay $10 for information you can get for free from many other sources? Article: 93558 of rec.radio.amateur.homebrew From: "Reg Edwards" Subject: New program. Two SWR meters Date: Wed, 6 Jul 2005 23:17:09 +0000 (UTC) Message-ID: This program models the behaviour of a transmission line plus antenna. The line impedance can have any Zo. The antenna feedpoint impedance can be any value of R+jX. Line length can be any fraction and number of wavelengths. Line overall attenuation can be any value of dBs. There is an SWR meter located at each end of the line. The meters also indicate the reflection coefficients at the locations. Meter Zo can be set equal to line Zo or to the standard 50 ohms. Line input impedance can be observed to change versus line length in wave-lengths, line attenuation and antenna impedance. The transforming action of the line can be demonstrated. The smaller SWR and reflection coefficient at the transmitter end of the line can be seen. The exact increase in loss due to standing waves on the line is calculated. The program can be used in practical applications and also for educational purposes. It is hoped it may prevent the outbreaks in violence which frequently occur in newsgroups about the meanings of SWR and the notions of reflected power. Download program SWRARGUE from website below in a few seconds. File size = 41 Kbytes. Run immediately. No unzipping inconvenience. ---- ........................................................... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp ........................................................... Article: 93559 of rec.radio.amateur.homebrew Date: Thu, 07 Jul 2005 10:59:21 +0200 From: PaoloC Subject: A DRM converter for Icom RTX Message-ID: <42cceeaa_2@x-privat.org> Hi. I have successfully built a 12kHz downconverter for Icom (T)RXes that use a 2nd -and last- IF at 9MHz. The adapter can be used to receive DRM HF broadcasts with commercial HAM rigs/RXs and plugs on the optional filter socket (no soldering required). Some devices that can mount optional 9MHz filters are: IC-706/MKii/MKiiG, IC-725/726/728/729, IC-735, IC-R70/71/75 receivers. A first test with a balcony homebrew antenna (http://spazioinwind.libero.it/ik1zyw/temp/IMG_0030.JPG) and an IC706MKiiG allowed me to receive bitXpress banner on 15.896 MHz and listen to Deutsche Welle on 6MHz broadcast band. I used "dream" software on Windows. The same downconverter can also be used with SDRadio (http://www.sdradio.org/, without sideband rejection) in order to accomplish narrowband filtering, or SSB/CW/FM demodulation for some receivers (such as IC-725/728 that require an optional unit for FM reception). I will soon carry on further reception tests as well as side-by-side comparison with 455-12 DRM converters on other receivers. If there is enough interest I will publish a complete description of this downconverter, including the design involved. - unless I receive an offer to buy the whole project :-) - Greetings, Paolo IK1ZYW QRPp-I #707 + www.paolocravero.tk + I QRP #476 SpamAssassin-based email antispam/antivirus solutions Italian/English-to/from-Croatian translations