Article: 101773 of rec.radio.amateur.boatanchors From: thierry_._stora_@_cegetel_._net Subject: Re: scr522-bc624 Date: Mon, 13 Feb 2006 23:13:45 +0100 Message-ID: References: <43ef2dfa$0$29179$8fcfb975@news.wanadoo.fr> wrote: >hello everyone,I need the schematic of the receiver part >of the scr522 ,I have found one schematic on the internet but it is >almost impossible to read.Thanks very much ,73 f1gqb Hi Alain, just send the schematic you need @ your email address. Far from pefect scan in two parts, the original is large. Hope it will help, with scissors and adhesive tape I think it can. Feddback welcome, other request of this schematic also. Schéma envoyé directement à votre adresse mail.... Etc! Thierry Stora http://www.chapelon.net Article: 101774 of rec.radio.amateur.boatanchors From: "Killemall" Subject: Nothing to do with tube radios Message-ID: Date: Tue, 14 Feb 2006 01:40:30 GMT http://video.google.com/videoplay?docid=8442014088728649932&q=koran Article: 101775 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: <1139866471.320620.216650@f14g2000cwb.googlegroups.com> Subject: Re: FT-243 Frequency Codes Message-ID: Date: Mon, 13 Feb 2006 20:50:07 -0500 "KE9EX" wrote in message news:1139866471.320620.216650@f14g2000cwb.googlegroups.com... > I read here or somewhere about how to translate the numbers stamped on > a FT-243 Crystal > to be able to tell the Crystal's Frequency. I have some with these > numbers stamped on them, > and want to be certain of the frequency, since the ink with the exact > Frequency has long since faded. TNX ex 73, Mike > If you don't get an answer--the FT-243 rocks are fundamental cuts. It would be easy to build an untuned Colpitts oscillator, and use a counter to determine the crystal frequency. A simple c-mos IC oscillator would probably also work. Pete Article: 101776 of rec.radio.amateur.boatanchors From: WD=?ISO-8859-1?B?2A==?=HCO Subject: Re: FT-243 Frequency Codes Date: Mon, 13 Feb 2006 20:38:37 -0600 Message-ID: References: <1139866471.320620.216650@f14g2000cwb.googlegroups.com> ANOTHER WAY IS TO USE AN MFJ ANTENNA ANALYZER - JUST USE ALLIGATOR CLIPS TO HOOK THE XTALS PINS TO THE SO-239 ON THE ANALYZER - TUNE ACCROSS - THE RESONANT FREQ WILL SHOW AS A 1:1 ON THE ANALYZER METER - JUST READ THE FREQ OFF THE LCD. - or - USE ANY XTAL TRANSMITTER BY PULLING OUT THE BUFFER/DRIVER TUBE AND TAKING A FREQ COUNTER OR SW RECEIVER NEAR THE OSCILLATOR TUBE AND KEY THE TRANSMITTER. WDØHCO - Biz > If you don't get an answer--the FT-243 rocks are fundamental cuts. It > would be easy to build an untuned Colpitts oscillator, and use a counter > to determine the crystal frequency. A simple c-mos IC oscillator would > probably also work. > > Pete > > Article: 101777 of rec.radio.amateur.boatanchors From: WD=?ISO-8859-1?B?2A==?=HCO Subject: OK YOU BRAINIACS - NEED HELP Date: Mon, 13 Feb 2006 20:52:16 -0600 Message-ID: OK I NEED HELP - REALLY I DO ... I AM PLAYING WITH A MICROWAVE OVEN - WOULD LIKE TO REDUCE THE POWER OUTPUT OF THE MAGENTRON - AS IT IS - IT IS SETUP FOR 600 WATTS PULSED ERP - THAT IS SHE PEAKS AT 600 WATTS 60 TIMES A SECOND - ANODE VOLTAGE IS 4500 VAC THROUGH A 125 VAC STEP UP TRANSFORMER. I WANT TO KEEP THIS VOLTAGE BUT WANT TO REDUCE THE CURRENT TO REDUCE POWER. BEST WAY I THINK IS TO REDUCE CURRENT ON THE PRIMARY 120 VAC SIDE OF THE TRANSFORMER. CAN'T REDUCE VOLTAGE OF 4500 VAC BECAUSE MAGNETRON FAILS TO OSCILLATE AND DRAWS A LARGE PLATE CURRENT. ANY IDEAS ? ALREADY TRIED A VARIAC ON THE PRIMARY - IT REDUCED VOLTAGE BUT DID NOT REDUCE POWER UNTIL THE MAGNETRON STOP OSCILLATING COMPLETELY. ANY HELP WOULD BE APPRECIATED - BIZ WDØHCO Article: 101778 of rec.radio.amateur.boatanchors From: Edward Knobloch Subject: Re: FT-243 Frequency Codes References: <1139866471.320620.216650@f14g2000cwb.googlegroups.com> Message-ID: Date: Tue, 14 Feb 2006 03:40:10 GMT KE9EX wrote: > I read here or somewhere about how to translate the numbers stamped on > a FT-243 Crystal > to be able to tell the Crystal's Frequency. I have some with these > numbers stamped on them, > and want to be certain of the frequency, since the ink with the exact > Frequency has long since faded. TNX ex 73, Mike > Hi, I wouldn't trust the crystal holder channel number to determine the operating frequency. It was very common after the war to reuse holders with different crystal blanks. I've got a few here with paper labels giving the actual crystal frequency, which has nothing to do with the channel number embossed on the crystal holder. Many surplus crystals were reground and mounted in the old holders, here is a web site showing the technique used: http://www.subdevo.com:82/n4jvp/crystal%20grinding/CrystalGrinding.htm 73, Ed Knobloch Article: 101779 of rec.radio.amateur.boatanchors From: "Dr.Death" Subject: Re: FS: Coax, Connectors & Adapters Date: Tue, 14 Feb 2006 01:26:59 -0600 Message-ID: <11v31i41d7n3o2f@corp.supernews.com> References: "Scott in Baltimore" wrote in message news:WoednUD-LKy5wGzeRVn-gA@comcast.com... spam snipped to prevent clogged arteries.... > > Can I get some eggs, toast and coffee with that? You don't actually eat that do you? We dumped that on the britts back in WW2. Caused more casualties than the Nazi's. LOL Article: 101780 of rec.radio.amateur.boatanchors Date: Tue, 14 Feb 2006 11:14:36 +0100 From: nierveze Subject: Re: scr522-bc624 References: <43ef2dfa$0$29179$8fcfb975@news.wanadoo.fr> <1139897761.047335.216290@g47g2000cwa.googlegroups.com> Message-ID: <43f1ad72$0$19702$8fcfb975@news.wanadoo.fr> Litzendraht wrote: > thierry_._stora_@_cegetel_._net wrote: > >>Hi Alain, >> >>just send the schematic you need @ your email address. >> >>Far from pefect scan in two parts, the original is large. Hope it will >>help, with scissors and adhesive tape I think it can. Feddback >>welcome, other request of this schematic also. >> >>Schéma envoyé directement à votre adresse mail.... Etc! >> >>Thierry Stora >> >>http://www.chapelon.net > > > > > Thank you Thierry for sending the schematic to Alain. I wish Alain well > in his radio astronomy ventures with 60 year old radio equipment. > > John > Hello every one ,thanks for your precious help, thanks Thierry for the schematics well arrived at home and well printed ,time will be long now the bc624 come from Honolulu....yesterday I went to my garage and got the bc 625 (transmitter) I already have ,it is in nice condition.The reason I plan to use the bc624 in radio-astronomy is simple :it is a radio-set I found on ebay at a reasonable price (shipping included ) (before ,I had looked at hamfests in France ,and did not find receivers in vhf old enought-1960 was the oldest),I am a long time om ,and doing radio-astronomy on the sun since 20 years with 'good' receivers,this project is to test with the receivers of the time of the discovery of radio-astronomy,nostalgia ... For those interested there is a book 'The early years of radio-astronomy' at Cambride university press ,that describes the material used at that time it is very interesting . In fact Reber at the beginning around 1939 used a 31 feet parabola and a trf amplifier with 4* 955 acorn tubes amplifier,and a 953 acorn diode ....the bc624 is of the nearly same time but as a superhet will be more sensitive ,the 9003 input tube is the successor of the 955 acorn in an another 'box'. This is for some explanations of all the questions. Of course if a scr522 fan club is done ,count on me with the bc625 and bc 624. Thanks again all of you 73 alain f1gqb Article: 101781 of rec.radio.amateur.boatanchors Date: Tue, 14 Feb 2006 21:43:15 +1000 From: Lionel Sharp Subject: Re: scr522-bc624 References: <43ef2dfa$0$29179$8fcfb975@news.wanadoo.fr> <1139792333.579925.213840@g44g2000cwa.googlegroups.com> <43f04cd0$0$21304$8fcfb975@news.wanadoo.fr> <43f069ce$0$15127$afc38c87@news.optusnet.com.au> <1139898979.068534.11560@z14g2000cwz.googlegroups.com> Message-ID: <43f1c253$0$19770$afc38c87@news.optusnet.com.au> Litzendraht wrote: > Lionel Sharp wrote: > >>Ah memories - I used an SCR522 Rx & Tx on 2 metres way way back. They >>were a great piece of gear and used by lots of hams. >> >>Before you apply power to the receiver (or transmitter) check out the >>.006mf mica HT bypass capacitors. Some of the sets used Micamold >>capacitors which are dark brown in colour and are in fact paper not >>mica. They used to break down with monotonous regularity. >> >>Best to replace the lot (15 or so)in the receiver (and Tx). Some >>SCR522's had good mica capacitors and if I remember they were light >>brown in colour. >> >>There were a couple of versions of the receiver that I know of. One >>version had a squelch relay whilst the other version had electronic squelch. >> >>I do have a manual but to copy the circuit it would be in 3 pieces and I >>dont know how the small print would come out.Also have the wiring diagram. >> >>There is a relative simple modification to make the RX tunable and not >>crystal controled >> >>You should be able to get a circuit locally if you hunt around, if not >>let me know and will try sending you a copy. > > > > > Lionel, > > Why don't we create an SCR 522 fan club? I eventually replaced the > 832 PA with an 829B and ran about 70 watts, modulated with a pair of > 1625's on two metres AM. Golly, those were my "wonder years". I was > still a kid in high school. I still have some 522 stuff about, but no > complete units. I do recall that all the equipment tags have the RAF > insignia. > > John > G'Day John I am sure that many of those who used the SCR522 in the past have passed on. When I used my SCR522 on 2 metres there was no TV and consequently no TVI. I think that TV changed all that. Even had one that was converted to 6 metres (the TX not RX). There was a rather large mains power supply, the RA62 produced in the USA for the military. The RAAF (Royal Australian Air Force) also had mains power supply made under contract and they are heeeavy. The RAF and RAAF designations was the TR5043. I believe it was descended from the RAF TR1143 VHF set which was used very successfully in the early days of WW2 for fighter control. When the Americans saw the successful use of VHF they took a TR1143 back to the USA and "Copied" it and produced it as the SCR522. Only ever saw one TR1143 in a surplus shop. I think that the TR1143 would be very rare nowadays. Someone will correct me if I am wrong about this. 73 Lionel L Sharp, VK4NS Article: 101782 of rec.radio.amateur.boatanchors Message-ID: <43F1D472.4D08E6C4@shaw.ca> From: Irv Finkleman Subject: Kenwood Ts-820s Relay Replacement Date: Tue, 14 Feb 2006 13:00:17 GMT I'm trying to locate a replacement for the relay which switches the IF and other circuitry between transmit and receive (not the antenna relay). Can anyone help me with a source please? Thanks in advance for any assistance. 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: 101783 of rec.radio.amateur.boatanchors From: "Clif Holland" References: <43F1D472.4D08E6C4@shaw.ca> Subject: Re: Kenwood Ts-820s Relay Replacement Message-ID: <0WlIf.21468$0H1.8781@trnddc04> Date: Tue, 14 Feb 2006 14:36:44 GMT Go to http://www.kenselectronics.com/lists/relays.htm and down toward the bottom he has listed a direct replacement. I haven't tried it but was given the info by someone who had and was satisfied. -- Clif Holland KA5IPF www.avvid.com "Irv Finkleman" wrote in message news:43F1D472.4D08E6C4@shaw.ca... > I'm trying to locate a replacement for the relay which switches the > IF and other circuitry between transmit and receive (not the > antenna relay). Can anyone help me with a source please? > > Thanks in advance for any assistance. > > 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: 101784 of rec.radio.amateur.boatanchors From: kludge@panix.com (Scott Dorsey) Subject: Re: FT-243 Frequency Codes Date: 14 Feb 2006 10:17:46 -0500 Message-ID: References: <1139866471.320620.216650@f14g2000cwb.googlegroups.com> KE9EX wrote: >I read here or somewhere about how to translate the numbers stamped on >a FT-243 Crystal >to be able to tell the Crystal's Frequency. I have some with these >numbers stamped on them, >and want to be certain of the frequency, since the ink with the exact >Frequency has long since faded. TNX ex 73, Mike I don't know offhand, BUT I know one of the Hints and Kinks books has a Pierce crystal oscillator circuit intended as a crystal tester. One FET, a couple resistors, and you take the output to a counter. Now you know what any crystal is, even one that some ham has polished down to a higher frequency. I have seen quite a few hamfest crystals that have been modified since they were surplussed. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." Article: 101785 of rec.radio.amateur.boatanchors From: kludge@panix.com (Scott Dorsey) Subject: Re: OK YOU BRAINIACS - NEED HELP Date: 14 Feb 2006 10:20:37 -0500 Message-ID: References: WD=?ISO-8859-1?B?2A==?=HCO wrote: >OK I NEED HELP - REALLY I DO ... > >I AM PLAYING WITH A MICROWAVE OVEN - > >WOULD LIKE TO REDUCE THE POWER OUTPUT OF THE MAGENTRON - > >AS IT IS - IT IS SETUP FOR 600 WATTS PULSED ERP - THAT IS SHE PEAKS AT 600 >WATTS 60 TIMES A SECOND - > >ANODE VOLTAGE IS 4500 VAC THROUGH A 125 VAC STEP UP TRANSFORMER. > >I WANT TO KEEP THIS VOLTAGE BUT WANT TO REDUCE THE CURRENT TO REDUCE POWER. You can't do that. From the supply side, the magnetron is basically a big diode. There is no grid. All you can do is adjust the voltage across it, and the current will follow. >ANY IDEAS ? ALREADY TRIED A VARIAC ON THE PRIMARY - IT REDUCED VOLTAGE BUT >DID NOT REDUCE POWER UNTIL THE MAGNETRON STOP OSCILLATING COMPLETELY. Right. It's not really intended to operate over a very wide range. There _is_ an article from Radio-Electronics in the mid-nineties on those things... they give some methods to modify them and to get them operating well out of their normal regime. Detuning it may be the easiest way to reduce the output level. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." Article: 101786 of rec.radio.amateur.boatanchors From: kludge@panix.com (Scott Dorsey) Subject: Re: scr522-bc624 Date: 14 Feb 2006 10:21:51 -0500 Message-ID: References: <43ef2dfa$0$29179$8fcfb975@news.wanadoo.fr> <1139897761.047335.216290@g47g2000cwa.googlegroups.com> Litzendraht wrote: > >Thank you Thierry for sending the schematic to Alain. I wish Alain well >in his radio astronomy ventures with 60 year old radio equipment. I have them all the time. Can't somebody DO something about Jupiter and the sun? They're always causing interference for me. Can't the FCC get them shut down or something? --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." Article: 101787 of rec.radio.amateur.boatanchors Subject: Re: OK YOU BRAINIACS - NEED HELP From: "JB" <1963@cybertime.net> Date: Tue, 14 Feb 2006 09:42:11 -0800 Message-ID: References: REDUCE THE POWER BY REDUCING THE DUTY CYCLE BY VARYING THE ON-OFF TIMES. YOU SHOULD NOT BE PLAYING WITH MICROWAVE OVENS IF YOU DONT UNDERSTAND PULSE OPERATION. WHEN YOU DROPPED THE VOLTAGE, YOU ACTUALLY HURT EFFICIENCY. IF YOU HAVE LIMITATIONS ON THE MAINS SUPPLY, GO WITH A SMALLER MAGNETRON. I.E. CHECK THE LABELS BEFORE YOU BUY. MOST CONSUMER MODELS PULL BETWEEN 8-15 AMPS DURING THE ON CYCLE. i SAW A CLAMP ON AC AMMETER FOR 20 BUCKS RECENTLY. TRY BEFORE YOU BUY. JIM, ac6tk Technical Consultant http://tekstuff.freespaces.com "Scott Dorsey" wrote in message news:dsssg5$9jv$1@panix2.panix.com... > WD=?ISO-8859-1?B?2A==?=HCO wrote: > >OK I NEED HELP - REALLY I DO ... > > > >I AM PLAYING WITH A MICROWAVE OVEN - > > > >WOULD LIKE TO REDUCE THE POWER OUTPUT OF THE MAGENTRON - > > > >AS IT IS - IT IS SETUP FOR 600 WATTS PULSED ERP - THAT IS SHE PEAKS AT 600 > >WATTS 60 TIMES A SECOND - > > > >ANODE VOLTAGE IS 4500 VAC THROUGH A 125 VAC STEP UP TRANSFORMER. > > > >I WANT TO KEEP THIS VOLTAGE BUT WANT TO REDUCE THE CURRENT TO REDUCE POWER. > > You can't do that. From the supply side, the magnetron is basically a big > diode. There is no grid. All you can do is adjust the voltage across it, > and the current will follow. > > >ANY IDEAS ? ALREADY TRIED A VARIAC ON THE PRIMARY - IT REDUCED VOLTAGE BUT > >DID NOT REDUCE POWER UNTIL THE MAGNETRON STOP OSCILLATING COMPLETELY. > > Right. It's not really intended to operate over a very wide range. > > There _is_ an article from Radio-Electronics in the mid-nineties on > those things... they give some methods to modify them and to get them > operating well out of their normal regime. Detuning it may be the > easiest way to reduce the output level. > --scott > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." Article: 101788 of rec.radio.amateur.boatanchors Date: Wed, 15 Feb 2006 06:54:04 +1000 From: Lionel Sharp Subject: Re: scr522-bc624 References: <43ef2dfa$0$29179$8fcfb975@news.wanadoo.fr> <1139792333.579925.213840@g44g2000cwa.googlegroups.com> <43f04cd0$0$21304$8fcfb975@news.wanadoo.fr> <43f069ce$0$15127$afc38c87@news.optusnet.com.au> <1139898979.068534.11560@z14g2000cwz.googlegroups.com> <43f1c253$0$19770$afc38c87@news.optusnet.com.au> Message-ID: <43f2436c$0$6297$afc38c87@news.optusnet.com.au> Chuck Harris wrote: > Lionel Sharp wrote: > >> I believe it was descended from the RAF TR1143 VHF set which was used >> very successfully in the early days of WW2 for fighter control. When >> the Americans saw the successful use of VHF they took a TR1143 back to >> the USA and "Copied" it and produced it as the SCR522. > > > You make it sound like we (the US) were doing something evil, by lending > you our manufacturing capability, and helping you with the war effort. > > -Chuck G'day Chuck No that was not the intention. Perhaps you can suggest another word that is more to your liking Lionel L Sharp, VK4NS Article: 101789 of rec.radio.amateur.boatanchors From: "Charlie Hugg" Subject: Electric Radio Mags for sale Message-ID: Date: Tue, 14 Feb 2006 15:38:41 -0600 I have the first 15 years of Electric Radio from 1989 thru 2003 for sale for $200. There are a few issues missing, but most years are complete. Some copies from 2004 and 2005 are included along with 4 duplicate copies from 91, 93, and 03. Thanks, Charlie Hugg, K5MBX -- ________________________________ See my Signal/One, Collins & Drake Photo Galleries and my Hallicrafters Virtual Museum at http://hug-a-bug.com Article: 101790 of rec.radio.amateur.boatanchors Date: Wed, 15 Feb 2006 15:03:22 +1000 From: Lionel Sharp Subject: Re: scr522-bc624 References: <43ef2dfa$0$29179$8fcfb975@news.wanadoo.fr> <1139792333.579925.213840@g44g2000cwa.googlegroups.com> <43f04cd0$0$21304$8fcfb975@news.wanadoo.fr> <43f069ce$0$15127$afc38c87@news.optusnet.com.au> <1139898979.068534.11560@z14g2000cwz.googlegroups.com> <43f1c253$0$19770$afc38c87@news.optusnet.com.au> <1139969962.790879.138270@g44g2000cwa.googlegroups.com> Message-ID: <43f2b61a$0$19770$afc38c87@news.optusnet.com.au> Chuck Harris wrote: > Litzendraht wrote: > >> Chuck Harris wrote: >> >>> You make it sound like we (the US) were doing something evil, by lending >>> you our manufacturing capability, and helping you with the war effort. >> >> >> >> Chuck, >> I think it might have been more a case of "immitation is the best >> form of flattery". I wasn't old enough to remember, but us Yanks were >> probably using all HF radio in our fighters and bombers. But once we >> got involved in the war effort, the success of the RAF and others with >> VHF radio must have told us that we needed similiar equipment. We could >> have certainly started from ground zero with our own designs, but >> reliable aircraft communications was a vital factor at the time, and >> VHF, being still a new form of transmission in those days, would have >> taken months and months on the drawing boards and lab and field testing >> to come up with a viable, operational unit. >> >> I can see where it could have been quite desireable to take a known >> working design, put our Yankee spin on it and get it into production. >> We and the Allies had a big job ahead of us over there and time was of >> essence. And yes,we were lending and loaning supplies, equipment, >> manufacturing, (and fighting men as well), as a part of a team effort >> to resolve a terrific world threat. >> >> John > > > Hi John, > > Everything I read says the SCR-522 was a redesign of the British TR-1123, > that was done to make it possible to mass produce it with US tooling. > > Certainly the US used the TR-1123 design as a quick way of getting a > working > VHF design into the war as quickly as possible. It was several years > before > the much more capable ARC-1 came out. > > My only objection was the way the OP stated that it was copy. It had the > familiar taste of US bashing. If I read the OP's intentions incorrectly, > and it sounds like I probably did, I am sorry. > > -Chuck G'day Chuck. There was no intention of US bashing or of there being something evil in my story. John (see above) stated the situation better than I and I agree with his sentiments. Lionel L Sharp, VK4NS Article: 101791 of rec.radio.amateur.boatanchors From: "Reg Edwards" Subject: New Program : OP_ANGLE Date: Wed, 15 Feb 2006 19:31:21 +0000 (UTC) Message-ID: New Program - OP_ANGLE.exe This program assists with understanding, choosing and setting the operating angles of Class-B and Class-C RF power amplifiers. The operating angle underlies all performance characteristics. Although RF operating conditions for tubes can be set up using manufacturers' data sheets, the program refers to use of a tube's Operating Characteristic Curves. Download program OP_ANGLE in a few seconds from website below. Not zipped up. Run immediately. File size = 39 kilobytes. ---- ........................................................... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp ........................................................... Article: 101792 of rec.radio.amateur.boatanchors From: "Charlie Hugg" Subject: Wanted WARC Kit for Mosley CL-33M BEAM Message-ID: Date: Wed, 15 Feb 2006 13:51:43 -0600 I am looking for the CL-33-M-WARC Kit to convert a Mosley CL-33-M to a CL-33-M WARC so that I can work the WARC Bands on my Mosley Beam. The Kit must be complete and in good shape and shippable to 79602. Please e-mail your price and the condition of the kit. Thanks, Charlie Hugg, K5MBX -- ________________________________ See my Signal/One, Collins & Drake Photo Galleries and my Hallicrafters Virtual Museum at http://hug-a-bug.com Article: 101793 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: Subject: Re: OK YOU BRAINIACS - NEED HELP Message-ID: <3UQIf.64002$bF.21387@dukeread07> Date: Wed, 15 Feb 2006 20:50:44 -0500 Guys, How do the "new" inverter technology microwave ovens operate? Pete Article: 101794 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: <1140060227.813342.197860@o13g2000cwo.googlegroups.com> Subject: Re: Heathkit HR-20 Operating Voltages Message-ID: Date: Wed, 15 Feb 2006 22:29:07 -0500 "sargent" wrote in message news:1140060227.813342.197860@o13g2000cwo.googlegroups.com... > I purchased a very nice Heathkit HR-20 receiver at a hamfest last > weekend. To my dismay, this receiver, unlike every other Heathkit I > have encountered, does not have the power plug labeled as to required > operating voltages. I have an HP-20, which I imagine will run it. > > Can anyone tell me by pin number what are the power requirements? > > Thanks. > Not to sound like a smart *ss, but you should get the manual for the set. Have you tried BAMA to see if the manual is listed for free download? Pete Article: 101795 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: Subject: Re: FS: Coax, Connectors & Adapters Message-ID: Date: Wed, 15 Feb 2006 22:29:43 -0500 "Scott in Baltimore" wrote in message news:WoednUD-LKy5wGzeRVn-gA@comcast.com... > SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM > SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM > SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM > SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM > SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM > SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM > SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM > SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM > > Can I get some eggs, toast and coffee with that? Monty Python fan??? Article: 101796 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: <1140060227.813342.197860@o13g2000cwo.googlegroups.com> Subject: Re: Heathkit HR-20 Operating Voltages Message-ID: Date: Wed, 15 Feb 2006 22:34:35 -0500 " Uncle Peter" wrote in message news:jkSIf.64014$bF.47245@dukeread07... > http://bama.edebris.com/manuals/heath/hr20/ Here is the link. Good luck with the rig. Pete Article: 101797 of rec.radio.amateur.boatanchors From: Edward Greeley Subject: 6GW8/ECL86 test setup Message-ID: Date: Thu, 16 Feb 2006 05:52:54 GMT Wonder if anyone out there in Tubesville has the settings for a TV-7 to check both sections of the subject tube. My 1962 TV-7 settings manual doesn't have it. Thanks for any info... Article: 101798 of rec.radio.amateur.boatanchors Subject: Re: 6GW8/ECL86 test setup From: "Jerry McCarty" References: Message-ID: Date: Thu, 16 Feb 2006 12:25:30 GMT On 16-Feb-2006, Edward Greeley wrote: > Wonder if anyone out there in Tubesville has the settings for a TV-7 to > check both sections of the subject tube. My 1962 TV-7 settings manual > doesn't have it. Thanks for any info... Nolan Lee has the settings on his site: http://www.acadiacom.net/nlee/tv-7_index.html Tell the ol' redneck I said hey Article: 101799 of rec.radio.amateur.boatanchors From: "al goss" Subject: FS/FT: Hallic. S-20R Message-ID: <2l3Jf.309$kg.160@news02.roc.ny> Date: Thu, 16 Feb 2006 18:17:34 GMT Dropped by UPS......can be repaired, I have no further interest old rcvr's or older much of anything. I sold & and shipped it... they dropped and unit was returned to me. I have pix. Cabinet warp about 1/4" needs warp straightening. Front panel paint & else-where pretty dang good for age. Might trade for older CW-AM tx 50-75w or prefer $90. shipped. Will easily cost 15-20 to ship. Poor health dictates no further interest old stuff. AL k2erg@arrl.net Article: 101800 of rec.radio.amateur.boatanchors From: ritchi50@optonline.net Subject: WTB: Hallicrafters Model SX-88 Message-ID: <26m9v197ephf22j2h98t2jfc4n3l7ipojj@4ax.com> Date: Thu, 16 Feb 2006 14:55:53 -0500 WTB: Hallicrafters Model SX-88 Reply with condition and price. Rich NJ Article: 101801 of rec.radio.amateur.boatanchors From: jim <3carroll@optonline.net> Subject: Re: FS: Coax, Connectors & Adapters References: Message-ID: Date: Thu, 16 Feb 2006 20:18:28 -0500 Uncle Peter wrote: > "Scott in Baltimore" wrote in message > news:WoednUD-LKy5wGzeRVn-gA@comcast.com... > >>SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >> >>Can I get some eggs, toast and coffee with that? > > > Monty Python fan??? > > whats the penguin doing on the tele? Article: 101802 of rec.radio.amateur.boatanchors From: " Ron in Radio Heaven" References: <11v31i41d7n3o2f@corp.supernews.com> Subject: Re: FS: Coax, Connectors & Adapters Message-ID: Date: Fri, 17 Feb 2006 01:56:45 GMT > > > > Can I get some eggs, toast and coffee with that? I like mine fried, with mustard on white bread. Ron Article: 101803 of rec.radio.amateur.boatanchors From: Ken Taylor Subject: Re: FS: Coax, Connectors & Adapters References: Message-ID: Date: Fri, 17 Feb 2006 15:04:16 +1300 jim wrote: > Uncle Peter wrote: > >> "Scott in Baltimore" wrote in message >> news:WoednUD-LKy5wGzeRVn-gA@comcast.com... >> >>> SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>> SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>> SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>> SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>> SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>> SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>> SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>> SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM >>> >>> Can I get some eggs, toast and coffee with that? >> >> >> >> Monty Python fan??? >> >> > whats the penguin doing on the tele? Standing. Oh, intercourse the penguin! Ken Article: 101805 of rec.radio.amateur.boatanchors From: - exray - Subject: Re: FS: Coax, Connectors & Adapters Date: Fri, 17 Feb 2006 00:08:49 -0400 Message-ID: <11vaj2gek0pagac@corp.supernews.com> References: <11v31i41d7n3o2f@corp.supernews.com> Ron in Radio Heaven wrote: >>>Can I get some eggs, toast and coffee with that? > > > I like mine fried, with mustard on white bread. > > Ron > > > Most people don't know how to fry Spam. Cook's Tip...treat it like bacon, not like meat. Article: 101806 of rec.radio.amateur.boatanchors Message-ID: <43F54E12.4030004@earthlink.net> From: Edward Greeley Subject: Re: 6GW8/ECL86 test setup References: Date: Fri, 17 Feb 2006 04:14:38 GMT Thanks for the pointer, Jerry. That's a resource I didn't know about. Regards, Ed Jerry McCarty wrote: > On 16-Feb-2006, Edward Greeley wrote: > > >>Wonder if anyone out there in Tubesville has the settings for a TV-7 to >>check both sections of the subject tube. My 1962 TV-7 settings manual >>doesn't have it. Thanks for any info... > > > Nolan Lee has the settings on his site: > http://www.acadiacom.net/nlee/tv-7_index.html > > Tell the ol' redneck I said hey Article: 101807 of rec.radio.amateur.boatanchors From: "U-Know-Who" References: <11v31i41d7n3o2f@corp.supernews.com> <11vaj2gek0pagac@corp.supernews.com> Subject: Re: FS: Coax, Connectors & Adapters Message-ID: Date: Fri, 17 Feb 2006 04:24:22 GMT "- exray -" wrote in message news:11vaj2gek0pagac@corp.supernews.com... > Ron in Radio Heaven wrote: > >>>>Can I get some eggs, toast and coffee with that? >> >> >> I like mine fried, with mustard on white bread. >> >> Ron >> >> >> > Most people don't know how to fry Spam. Cook's Tip...treat it like bacon, > not like meat. Agreed! It tastes much like bacon when you fry it. Works well for a camping trip! Article: 101808 of rec.radio.amateur.boatanchors Date: Fri, 17 Feb 2006 11:30:27 +0100 From: nierveze Subject: Re: SCR 522--BC 624 References: <43ef2dfa$0$29179$8fcfb975@news.wanadoo.fr> <1139897761.047335.216290@g47g2000cwa.googlegroups.com> <43f1ad72$0$19702$8fcfb975@news.wanadoo.fr> <1140121009.217494.135560@z14g2000cwz.googlegroups.com> Message-ID: <43f5a5a8$0$21270$8fcfb975@news.wanadoo.fr> Litzendraht wrote: > nierveze wrote: > >>the 9003 input tube is the successor of the 955 acorn in an another 'box'. > > > > Alain, > I was pleased that you mentioned the 9003 being the successor of an > acorn tube. I started to mention that when I said I replaced the 9003's > with 6AK5's. There was a series of 7 pin minatures that replicated some > of the acorns. > > I think the 9003 was actually the replacement for a 954 pentode acorn > and the 9002 (also used in the BC 624) replaced a 955 triode. > > My B&W grid dip meter that I've had for a hundred years uses a 955 > oscillator. And I did some tinkering in those early days with portable > 2 metre equipment with 957 battery triodes. One small transmitter I > built used a single 957 ultra-audion oscillator and I modulated it with > a Shure magnetic microphone in series with the grid resistor ground > return. Pretty simple circuit. It sounded great on the BC 624! > > What type of antenna array do you plan to use? Do you know the > frequency range that was used in the early experiments that you > mentioned? > > John > Hello John first of all to share my happiness ,my bc624 is at home ,it took just a week to come from Honolulu to France .This fact itself is marvelous!!!It is in perfect good condition.It is marvelous to see 60 years old radio-set in such a nice condition ,it is nearly complete ,only the front panel mechanic to select channels ,has been removed .As a begining I plan to use simple 2m yagi ,I have three of then 'tailored' on 150 mhz that is an official band of radio-astronomy (shared with other services ).In the beginning of radio-astronomy after several test on microwave (around 3ghz) ,G.Reber finally used 169mhz ,a frequency that is still in use in radio-astronomy in several observatories .Here I have been using that frequency with modified vhf radio-reciver (just cut one turn out of the input coils ,and tune again ,and tv antennas are ok)alas now there is lot of qrm by vhf relais ,it is a local problem .I'll keep you informed . You are right about the tubes ,I also have a gdo of that kind ,and several acorn tubes .Thanks ,good bye 73 alain f1gqb Article: 101809 of rec.radio.amateur.boatanchors From: Ken Subject: Frequency Meter BC-153 Signal Corps Message-ID: Date: Fri, 17 Feb 2006 08:03:27 -0500 Not much luck on abpr, so I'll try it here. Got this on ebay just for the fun of it, pics on binary under whatzitfor. It's a Signal Corps Frequency Meter type BC-153, 75 to 1500kc. It consists of a large tuning cap and three coils that are switched in series to get three different bands, 75-225kc, 200-700kc and 600-1600kc. These form a tank circuit with a meter in series with the tuning cap and coil. It also has an adjustable buzzer feeding the top of the tank, and a battery for the buzzer. I figure you set the buzzer going and pick up the freq you want with the tuning. Someone has put a dc voltmeter in place of the original one, probably was an ac ammeter, which shows the internal tank current, a power indicator probably? There are no external connections except to add more inductance for a lower resonance. My guess is, this tank circuit radiated the resonant frequency to be picked up by a receiver, like a sig gen. Any guesses out there, and what type meter might have been used? I think this might be early 30's. Any info available? Ken Article: 101810 of rec.radio.amateur.boatanchors Message-ID: <43F5E185.C52597B@earthlink.net> From: "Michael A. Terrell" Subject: Re: scr522-bc624 References: <43ef2dfa$0$29179$8fcfb975@news.wanadoo.fr> <1139897761.047335.216290@g47g2000cwa.googlegroups.com> Date: Fri, 17 Feb 2006 14:46:40 GMT Scott Dorsey wrote: > > Litzendraht wrote: > > > >Thank you Thierry for sending the schematic to Alain. I wish Alain well > >in his radio astronomy ventures with 60 year old radio equipment. > > I have them all the time. Can't somebody DO something about Jupiter > and the sun? They're always causing interference for me. Can't the > FCC get them shut down or something? > --scott > > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." Yeah! Where is "Marvin the Martian" when you need him? I guess that he is still looking for a Illudium Q-36 Explosive Space Modulator. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida Article: 101811 of rec.radio.amateur.boatanchors Message-ID: <43F5E1F6.B6BF1262@earthlink.net> From: "Michael A. Terrell" Subject: CKB-74028 Hetrodyne Frequency Meter Date: Fri, 17 Feb 2006 14:48:32 GMT Is anyone interested in a pair of these? They appear to be complete, and one has a shock mount. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida Article: 101812 of rec.radio.amateur.boatanchors Message-ID: <43F5E380.AAAEA9D6@earthlink.net> From: "Michael A. Terrell" Subject: Re: FS: Coax, Connectors & Adapters References: <11v31i41d7n3o2f@corp.supernews.com> Date: Fri, 17 Feb 2006 14:55:06 GMT "Dr.Death" wrote: > > "Scott in Baltimore" wrote in message > news:WoednUD-LKy5wGzeRVn-gA@comcast.com... > spam snipped to prevent clogged arteries.... > > > > Can I get some eggs, toast and coffee with that? > > You don't actually eat that do you? We dumped that on the britts back in > WW2. Caused more casualties than the Nazi's. LOL It sure came in handy the last couple years right after the hurricanes ripped down power poles and electric lines here in Marion County, Florida. No electricity, roads closed and no stores open so you ate cold canned goods. i have a dozen cans already for this year's hurricane season, along with a couple large jars of peanut butter and several boxes of crackers. It was weeks before the stores had fresh fruit and vegetables, or much of anything else. :( -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida Article: 101813 of rec.radio.amateur.boatanchors From: spamatody@spam.spam.spam Subject: Re: FS/FT: Hallic. S-20R Date: Fri, 17 Feb 2006 09:06:26 -0600 Message-ID: References: <2l3Jf.309$kg.160@news02.roc.ny> On Thu, 16 Feb 2006 18:17:34 GMT, "al goss" wrote: I have no further interest old rcvr's >or older much of anything. but... >Might trade for older CW-AM tx 50-75w Article: 101814 of rec.radio.amateur.boatanchors From: Bill Janssen Subject: Re: Frequency Meter BC-153 Signal Corps References: Message-ID: Date: Fri, 17 Feb 2006 16:17:50 GMT K3HVG wrote: > Its an absorbtion/field strength meter for LF beacons and similar > transmitters. It does not radiate, per se. > > Ken wrote: > >> Not much luck on abpr, so I'll try it here. Got this on ebay just for >> the fun of it, pics on binary under whatzitfor. It's a Signal Corps >> Frequency Meter type BC-153, 75 to 1500kc. > > Also known as a Wave Meter. With a buzzer it is a low power "spark" transmitter. Bill K7NOM Article: 101815 of rec.radio.amateur.boatanchors From: Ken Subject: Re: Frequency Meter BC-153 Signal Corps References: Message-ID: Date: Fri, 17 Feb 2006 11:37:35 -0500 So it can either generate or receive it's resonant freq? What value current meter would have been used in the tank, I assume it's ac? Ken Bill Janssen wrote: > K3HVG wrote: > >> Its an absorbtion/field strength meter for LF beacons and similar >> transmitters. It does not radiate, per se. >> >> Ken wrote: >> >>> Not much luck on abpr, so I'll try it here. Got this on ebay just for >>> the fun of it, pics on binary under whatzitfor. It's a Signal Corps >>> Frequency Meter type BC-153, 75 to 1500kc. >> >> >> > Also known as a Wave Meter. With a buzzer it is a low power "spark" > transmitter. > > Bill K7NOM Article: 101816 of rec.radio.amateur.boatanchors From: Edward Greeley Subject: WTB: Plate & Fil. Transformer for small receiver Message-ID: Date: Fri, 17 Feb 2006 22:26:40 GMT Looking for the following tranny at less than the "E-Place" price: Primary 110-120 VAC; HV Secondary 480 to 600 VCT @ 65 ma minimum; Filament Secondary 6.3 V @ 2.5 A minimum. Don't need a 5 V Secondary but can use a transformer that has one of course. Prefer open or enclosed upright mount but can use half-shell horizontal mount type if necessary. This would be for an elderly, 5 tube Körting (German) radio. What'cha got? Thanks, Ed Greeley Mobile, AL Article: 101817 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: <2xuJf.6120$n67.911@edtnps89> Subject: Re: Heathkit tube tester mod.tt-1 Message-ID: <9avJf.147$2c4.11@dukeread11> Date: Fri, 17 Feb 2006 20:57:25 -0500 "R" wrote in message news:2xuJf.6120$n67.911@edtnps89... > I have for sale a tube tester from Heathkit model TT-1.The outside case need > a little tlc.The tester itself is in a mint condition with not a > scratch...comes with all the books.If interested,feel free to contact > me...have a great day....Rick > Is it for sale, or are you fishing for the best price you can get? Why not just post what you want for it? Pete Article: 101818 of rec.radio.amateur.boatanchors From: "Paul P" References: Subject: Re: Modern Xtal Calibrator? Message-ID: Date: Sun, 19 Feb 2006 00:31:44 GMT No you were not. I thought I had seen it too. Try these links: http://www.arrl.org/search/?q=marker+generator has the result: http://www.arrl.org/notes/hbk-templates/markgen.pdf This lead might help you. PP "Denis Sharon" wrote in message news:puedndV9lLsVMmrenZ2dnUVZ_tmdnZ2d@comcast.com... > I'm fairly certain that I recently saw an advertisement in QST for a > modern technology crystal calibrator (marker generator) intended for use > with boatanchors. As I recall, it had numerous outputs and looked well > thought out. Trouble is, I can't find it now. Was I dreaming? > > Regards, > > Denis Sharon W1AOK > > > ------------------------------------ > > Article: 101819 of rec.radio.amateur.boatanchors From: ritchi50@optonline.net Subject: WTB: Nation NC-183D Reciever Message-ID: Date: Sat, 18 Feb 2006 19:37:07 -0500 WTB: Nation NC-183D Reciever Please leave condition and price through email. ritchi50@optonline.net Article: 101820 of rec.radio.amateur.boatanchors From: ritchi50@optonline.net Subject: WTB: National NC-183D Reciever Message-ID: Date: Sat, 18 Feb 2006 19:43:47 -0500 WTB: National NC-183D Reciever Please leave condition and price through email. ritchi50@optonline.net Article: 101821 of rec.radio.amateur.boatanchors From: "Paul P" Subject: May be OT - Mechanical Collins filters Message-ID: <2cPJf.3132$lR2.2088@trndny01> Date: Sun, 19 Feb 2006 00:44:46 GMT I am new to Ham but a multi-decade experienced technician. BUT What is a "Mechanical" Collins filter? I know what they are used for but why are they called Mechanical? I get an image of a tiny squirrel running in a cage..... Thanks, Paul. Article: 101822 of rec.radio.amateur.boatanchors From: "Paul P" References: Subject: Re: Drake TR-3 9.000 MHz crystal? Message-ID: <%oPJf.3134$lR2.3107@trndny01> Date: Sun, 19 Feb 2006 00:58:35 GMT "Steve Reinhardt" wrote in message news:bNOGf.28$UW2.8@fe03.lga... > My searches on the Yahoogroups and elsewhere have left me short of a > complete answer. International Crystal declined my request for quote. ECS > has a serial tuned 9 MHz crystal with 30ppm stability, but I'm not sure I > can pull it in a 20pf parallel circuit. > > Anybody got another hint? > > 73's > Steve > W1KF How about these guys? Crystal here: http://www.icmfg.com/crystal_hc50u.html Prices here: https://www.icmfg.com/order_crystals.html Found at: http://www.arrl.org/ads/adlinks.html I am fighting a Hammarlund HX50 dead and aging crystals and a drake TR-4 10m (all three bands) crystal (or something) problems. I'd be interested to hear of your experiences/solutions. Paul kb3lzp Article: 101823 of rec.radio.amateur.boatanchors From: "Mike Andrews" Subject: Re: May be OT - Mechanical Collins filters Date: Sun, 19 Feb 2006 01:03:50 +0000 (UTC) Message-ID: References: <2cPJf.3132$lR2.2088@trndny01> Paul P wrote: > I am new to Ham but a multi-decade experienced technician. BUT What is a > "Mechanical" Collins filter? I know what they are used for but why are they > called Mechanical? > I get an image of a tiny squirrel running in a cage..... It's not quite like that. But they do have moving parts, though not quite as you imagine them. Put a transducer on one end of a can to convert signal into mechanical motion. Have it drive a thin, stiff rod along the axis of the rod. Along the rod, at regular intervals, solder or weld the edges of a few (maybe as many as 5 or 6) discs of metal, so that the discs are all concentric. Now solder or weld another thin, stiff rod to all the discs, 180 degrees away from the first, and put its free end into another transducer at the other end of the can; the second transducer converts mechanical motion back into signal. The center frequency and bandwidth are determined by mechanical properties of the discs. Collins developed these as small, sharp filters with steep skirts, relatively-good passband ripple, and tolerable loss. See for information on more modern mechanical filters as well as the old "drumhead" filters I describe above. A Google search on "collins mechanical filter" will produce a plethora of useful hits, too. 73, de -- Mike Andrews, W5EGO mikea@mikea.ath.cx Tired old sysadmin Article: 101824 of rec.radio.amateur.boatanchors From: "Paul P" References: <2cPJf.3132$lR2.2088@trndny01> Subject: Re: May be OT - Mechanical Collins filters Message-ID: Date: Sun, 19 Feb 2006 02:32:47 GMT "Mike Andrews" wrote in message news:dt8g5m$q48$1@puck.litech.org... > Paul P wrote: >> I am new to Ham but a multi-decade experienced technician. BUT What is a >> "Mechanical" Collins filter? I know what they are used for but why are >> they >> called Mechanical? > >> I get an image of a tiny squirrel running in a cage..... > > It's not quite like that. > > But they do have moving parts, though not quite as you imagine them. > > Put a transducer on one end of a can to convert signal into mechanical > motion. Have it drive a thin, stiff rod along the axis of the rod. > Along the rod, at regular intervals, solder or weld the edges of a few > (maybe as many as 5 or 6) discs of metal, so that the discs are all > concentric. Now solder or weld another thin, stiff rod to all the > discs, 180 degrees away from the first, and put its free end into > another transducer at the other end of the can; the second transducer > converts mechanical motion back into signal. The center frequency and > bandwidth are determined by mechanical properties of the discs. > > Collins developed these as small, sharp filters with steep skirts, > relatively-good passband ripple, and tolerable loss. > > See > > for information on more modern mechanical filters as well as the old > "drumhead" filters I describe above. > > A Google search on "collins mechanical filter" will produce a plethora > of useful hits, too. > > 73, de > > -- > Mike Andrews, W5EGO > mikea@mikea.ath.cx > Tired old sysadmin Mike, That makes totally sense. I never imagined a filter made up like that. But it makes total sense when you see it. Now I am really curious. Duh. I should have Googled it. Thanks, Paul kb3lzp www.ppinyot.com Article: 101825 of rec.radio.amateur.boatanchors From: "David Thompson" Subject: WTB VFO and SSB./CW Slicer Message-ID: Date: Sun, 19 Feb 2006 05:11:59 GMT I had to sell many of my boatanchors over the past three years. Now I want to find two specific items. A stable VFO with at keast 60 to 80 RMS volts out to drive a SB-10 to a couple of watts. 80 to 10 meters. A CW/SSB slicer for my HQ-129X (455 kcs IF). Please e-mail me directly at thompson@mindspring.com with price and condition