[Elecraft] Re: Increasing Receiver Gain

[James Hammons]

     I tried a 47k pot in place of R1 and found that as you go to
lower values the agc will soon cease to function as it should.  If you
have enough gain so you can clearly hear the receiver noise, with the
antenna disconnected, AF pot max, in both pre on and off positions,
you have more than enough gain. This is a worst case situation the
noise with an antenna connected will always be more than this,  If you
don't hear an increase in noise when antenna is connected you have
some other problem.  The S meter must be calibrated after any change
to read meaningful values.

     I had previously increased the gain of my audio filter, I
restored this back to factory values,  I wanted a little more gain
since I had done the KI6WX variation of the 2nd filter mod.  This
gives a very flat passband but causes about 2db more insertion loss.
I found that the change of R1 to 47k was adequate and so I put in a
47k fixed resistor in place of the trimmer pot.  The original value
was no doubt also adequate.

James