[R-390] R-392

[John Bunting]

Andy,

Thanks for the reply, I sure don't want to do any design work on this 
classic.  Just was bugged about that clipped negative waveform.  Won't worry 
about it any longer as I do not have any legitimate need to use that IF 
output jack.

73, John, W4NET
----- Original Message ----- 
From: "James A. (Andy) Moorer" <jamminpower at earthlink.net>


> The cathode follower for the IF output on the R-392 is very poorly 
> designed. The waveform is essentially saturated on one side - it is quite 
> ugly and has lots of harmonics. This waveform is not used internally - it 
> is only for external SSB converters. It does tolerably well for that. 
> Unless you plan to use your IF output for, say, a Sherwood detector, just 
> ignore it. If you have to have a pretty sinusoid, you will have to 
> redesign that stage, probably using transistors instead of the tube. I 
> haven't tried to do this yet, but it looks straightforward (if you have 
> done circuit design before).
>
> James A. (Andy) Moorer
> www.jamminpower.com