I have no experience with the R7 but some experience with AGC loops in
general. It is VERY difficult to design a good AGC and many radios get it
wrong. For example, designing it for the user's eyes (vs ears) means
paying too much attention to the S-meter indication. Using the loop
feedback
Have had issues with the R7 AGC in fast mode in that the AGC would go
into a low frequency oscillation excited by noise. Looking at the AGC
line showed a triangular waveform. This caused distortion on AM and SSB
signals. This problem went away when the RF gain control was turned
Wow, nice detective work Paul! I've had correspondence with John too, but it
was mostly about the AGC alignment and the subject of the fast AGC never came
up. I would agree with the assessment that it is useless, the poppy-ness on
noise alone is just to annoying to put up with, and manual
Thanks Paul for sharing this!
I found the fast AGC on the R7 useless, too. I will try the proposed mod
on my R7.
@Jim, would you say that the service manual describes the right methode
for aligning the AGC?
I have had my doubts about it in the past, mostly because 'fast' would
always create
On Sat, 11 May 2013 22:52:57 +0200, Dieter Horst wrote:
@Jim, would you say that the service manual describes the right methode
for aligning the AGC?
I have had my doubts about it in the past, mostly because 'fast' would
always create trouble.
Yes. In my discussions with John, he told me that
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