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#1
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AM operation of KWM?
I saw an auction for a Sampson Modulator which looks to be a way to apply full plate modulated audio to the output section of a Collins transmitter or transceiver. it has the "11 pin octal" socket which is used, aside from relays, only two places I know of, the Collins S-Line ham equipment and Hammond organ speaker cabs. First, is that what this is? Second, since the KWM-2 has no AM position, how is the BFO disabled for AM rx operation? The audio would be unpleasant even if intelligible if AM were listened to in a SSB mode. My guess is that this was actually intended for illicit 11 meter use but would be usable on any band. |
#2
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Actually, receiving am with a bfo is fine. You are just copying 1/2 of the
sideband. The Drake 1A came out when am was still popular and no am detector or switch. Called exhalted carrier or something like that. I think there were a number of rigs that use the 11 pin plug. The Johnson products, including the Ranger and Pacemaker and Valiant, if I recall correctly. But, do not shoot me, please, if I am wrong. My wife points out my faults often. 73, Colin K7FM |
#3
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"Bret Ludwig" wrote in message oups.com... I saw an auction for a Sampson Modulator which looks to be a way to apply full plate modulated audio to the output section of a Collins transmitter or transceiver. it has the "11 pin octal" socket which is used, aside from relays, only two places I know of, the Collins S-Line ham equipment and Hammond organ speaker cabs. First, is that what this is? Second, since the KWM-2 has no AM position, how is the BFO disabled for AM rx operation? The audio would be unpleasant even if intelligible if AM were listened to in a SSB mode. My guess is that this was actually intended for illicit 11 meter use but would be usable on any band. 11 pin Octal socket was used on a LOT of equipment in the 50/60s. Your right tho....sounds like some sort of CB junk to me. I used Collins S-lines and KWM2s for years. Never ever heard of a outboard "AM Modulator". Why anyone would want to do that is beyond me. Dan/W4NTI |
#4
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Behold, Dan/W4NTI scribed on tube chassis:
"Bret Ludwig" wrote in message oups.com... I saw an auction for a Sampson Modulator which looks to be a way to apply full plate modulated audio to the output section of a Collins transmitter or transceiver. it has the "11 pin octal" socket which is used, aside from relays, only two places I know of, the Collins S-Line ham equipment and Hammond organ speaker cabs. First, is that what this is? Second, since the KWM-2 has no AM position, how is the BFO disabled for AM rx operation? The audio would be unpleasant even if intelligible if AM were listened to in a SSB mode. My guess is that this was actually intended for illicit 11 meter use but would be usable on any band. 11 pin Octal socket was used on a LOT of equipment in the 50/60s. Your right tho....sounds like some sort of CB junk to me. I used Collins S-lines and KWM2s for years. Never ever heard of a outboard "AM Modulator". Why anyone would want to do that is beyond me. Dan/W4NTI Looking at my 1963 ARRL Radio Amateur's Handbook, outboard modulators were the "in" thing back then. -- Gregg "t3h g33k" http://geek.scorpiorising.ca *Ratings are for transistors, tubes have guidelines* |
#5
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Gregg wrote:
11 pin Octal socket was used on a LOT of equipment in the 50/60s. Your right tho....sounds like some sort of CB junk to me. I used Collins S-lines and KWM2s for years. Never ever heard of a outboard "AM Modulator". Why anyone would want to do that is beyond me. Dan/W4NTI Looking at my 1963 ARRL Radio Amateur's Handbook, outboard modulators were the "in" thing back then. Not on SSB rigs. -Bill |
#6
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-ex- wrote: Gregg wrote: snip Dan/W4NTI Looking at my 1963 ARRL Radio Amateur's Handbook, outboard modulators were the "in" thing back then. Not on SSB rigs. -Bill That's the point. If you HAD a KWM and wanted to work AM, apparently this was the thing. |
#7
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Bret Ludwig wrote:
-ex- wrote: Gregg wrote: snip Dan/W4NTI Looking at my 1963 ARRL Radio Amateur's Handbook, outboard modulators were the "in" thing back then. Not on SSB rigs. -Bill That's the point. If you HAD a KWM and wanted to work AM, apparently this was the thing. Uh...I was referring to the 1963 Handbook comment. -Bill |
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