UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - SSB adapter, converter to suit Collins R390A receiver.

QQVO6/40 · 11th May 2021, 1:49 pm

Greetings all.
CV-157.
I was in error a little bit. It has 44 valves and not 43 as I had previously quoted.
More tidbits.
It weighs 104 lbs in all of it's nakedness.
Accepts an IF frequency of 450 to 510kc and then down converts that to 100kc to work it's magic.
The heterodyne oscillator operates 100kc above the incoming frequency.
Consumes 250W of mains power.
David is correct in saying that there are a lot of smaller devices around that appeared not long after these large chunks were put into service.
It is not really of much use today as my small rice box will pull ssb signals out of the mud very well and not be a back breaker to get there. The only thing a rice box can't do is to run same frequency diversity. But let's be honest here; who in the amateur radio world runs voice and telex on the two sidebands of the same frequency. I can't think of any.
I did it once with an old friend years ago to see how it would work and it did do very well. He is now a silent key and all of his gear has gone.
I just got it going to say yes I have one and it was fun to play with and now time to move on.
All good.
Cheers all.
Robert.

11th May 2021, 1:49 pm	#17
QQVO6/40 Hexode Join Date: May 2009 Location: Newcastle, Australia Posts: 319	Re: SSB adapter, converter to suit Collins R390A receiver. Greetings all. CV-157. I was in error a little bit. It has 44 valves and not 43 as I had previously quoted. More tidbits. It weighs 104 lbs in all of it's nakedness. Accepts an IF frequency of 450 to 510kc and then down converts that to 100kc to work it's magic. The heterodyne oscillator operates 100kc above the incoming frequency. Consumes 250W of mains power. David is correct in saying that there are a lot of smaller devices around that appeared not long after these large chunks were put into service. It is not really of much use today as my small rice box will pull ssb signals out of the mud very well and not be a back breaker to get there. The only thing a rice box can't do is to run same frequency diversity. But let's be honest here; who in the amateur radio world runs voice and telex on the two sidebands of the same frequency. I can't think of any. I did it once with an old friend years ago to see how it would work and it did do very well. He is now a silent key and all of his gear has gone. I just got it going to say yes I have one and it was fun to play with and now time to move on. All good. Cheers all. Robert.