[R-390] Attack Time Of K5OP Audio Derived AGC

[Dallas Lankford]

This evening I measured the attack time of the K5OP audio derived AGC.  =
It was about what I expected.  With the LINE GAIN set at 7, and SLOW =
AGC, the attack time was about 1.5 milliseconds.  A slight amount of =
"overshoot" (strictly speaking, undershoot) was observed.  I can't hear =
it either in the lab, or when receiving actual SSB, so it is not worth =
getting excited about.  A resistor (value to be determined) in the AGC =
line would probably fix it, and I may do that eventually.  As the LINE =
GAIN is decreased (not recommended), the attack time increases.  At LINE =
GAIN 3 the attack time is about 5 milliseconds, and as I said before, =
some pops and clicks are observed on initial syllables.  I should add =
that the LINE GAIN pots in my R-390A's (and, in fact, all pots) have =
been replaced with new AP Type J pots (formerly Allen Bradley, but now =
Clarostat).  If you have an R-390A with a well worn LINE GAIN pot, there =
is no telling how the K5OP mod will work in your R-390A.    

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