[Elecraft] Receiver Gain

[Mike Harris]

Hi,

> Mike, I have gotten my feet a little wet in this area by replacing R5 with
> a 50K pot. R5 determines the gain of the AGC mixer amp and thus the
> magnitude of AGC voltage developed as a function of signal level.
>
> R1, on the other hand, sets the operating bias for the amp and thus
> determines at what signal level the AGC compression (determined by R5)
sets
> in.

Interesting the R5 idea.  Unless I'm missed it somewhere I've never seen any
data on the audio level change against RF signal increase from some
threshold.  It used to be a common spec. item in the old days.

A variable in place of R5 would possibly allow optimisation of this
parameter.

Regards,

Mike VP8NO (IOTA SA-002)
GQRP 10148
K2/100 #1400