Rob,
Thanks for sharing your insights on this.
What I think you are saying is that AGC attack distortion is a ¡°feature¡± of some of the designs in the receivers by Collins and Drake, and that this distortion increases as the decay time is reduced (which is what I am seeing). Also, the time constants used for the fast decays are off from what you recommend.
I don¡¯t operate CW so the distortion I am seeing with the M and F settings is not an operational issue for me. However, the engineer in me wants to fix the AGC if something is broken and it is not operating as designed. What I have concluded from your comments is that this is not the case.
What I failed to mention is that I have installed your NE602 product detector. I didn¡¯t mention it because I didn¡¯t suspect it could be a contributor to an AGC problem. So, did this detector mod eliminate the AGC attack distortion, or only reduce it.
As an aside, before I built and installed your NE602 product detector I tried a 1496 mixer circuit that I had laying around from a previous project. The conversion gain was so much lower than the original design that it was not a viable option.
--
Bill N0CU
