[R-390] Duuuhhh (K5OP Audio Derived AGC)

[Dallas Lankford]

First, let me say how much I appreciate the stimulation questions I have =
been asked about the K5OP Audio Derived AGC mod.  Sorry about the =
mistakes, and I hope you will be patient with any of my =
misunderstandings.

Anyway, I was asked, several times I think, if the K5OP mod would work =
with an unmodified R-390A.  I said "probably not," thinking the question =
was about the SLOW AGC.  But I forgot all about the MED and FAST.  For =
all I know it will work just fine with them.  I would do my old 2 diode =
AGC mod, though, (and remove R547, or unsolder one end of R547) because =
it is so simple to do, and it provides longer release times for FAST and =
MED (which is desirable).

Removal of R547 may cause the SLOW AGC to "hang" for a while and only =
slowly drop back to normal.  I'm not sure on this, though.  It has been =
too long since I studied the R-390A AGC variations.

I have an unmodified IF deck that I will try with the K5OP Audio Derived =
AGC and report on that later.

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