[Elecraft] RF-Gain & S-Meter (again)

[Guy Olinger K2AV]

Exactly, which is what most people expect, without knowing that they
expect it, since 99% of ham receivers have done that since AGC first
showed up.

This behavior is CODED INTO the K3 firmware algorithm for the S-meter
presentation.  It is not mandated by the way hardware is wired.  It is
a choice made by the coder of K3 firmware, not the designer of circuit
board traces.  The firmware COULD be coded to always show the signal
level at the antenna input regardless of RF gain setting, which is
what I would prefer.  This could be turned on when CONFIG:SMTR MD is
set to ABS.

73, Guy.

On Sat, May 28, 2011 at 11:04 PM, Mike Morrow <kk5f at earthlink.net> wrote:
> The more common method for the past 65 years or so has been to use the AGC
> circuit to reduce stage gain for both automatic AND manual gain control:
> (1A) AGC, which as it gets larger for stronger signals increases bias
>     voltage to the RF and IF stages.  This is the input to the S-meter.
>            PLUS
> (1B) Manual RF gain, which manually increases the bias voltage in the
>     AGC circuit to the RF and IF stages, and thus directly affects
>     the S-meter just as any AGC bias voltage increase would.
>