[R-390] R-390A Improving Capt. Lee Product Detector and SSB AGC

[Larry H]

Hi  All,

The original implementation of Capt. Lee’s Product Detector for the R-390A,
1: bypassed the noise limiter, 2: used a modified front panel BFO on/off
switch to switch the audio, and 3: did not update the AGC for good and easy
SSB reception. This document is focusing on fixing 2 and 3.  It describes
how to install and use the mini relay (found by Jacques Fortin) to switch
the audio for Capt. Lee’s Product Detector. This solution is a lot easier
to install than altering the front panel BFO on/off switch and since
the mod is all contained in the IF deck, it makes substituting IF modules
very easy.  Here's a link to it:

Improving Lee Prod Det and SSB AGC.pdf (r-390a.net)
<https://www.r-390a.net/Improving%20Lee%20Prod%20Det%20and%20SSB%20AGC.pdf>

There's also  a link to it inthe 'repair tutorials' section of the
'references' page on our website.

Regards, Larry