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

[Ken Roberson]

Hello all,

I agree with Guy.

This could be turned on when CONFIG:SMTR MD is
set to ABS.

Ken K5DNL
------------------------------------------------------------ 

--- On Sun, 5/29/11, Guy Olinger K2AV <olinger at bellsouth.net> wrote:

> From: Guy Olinger K2AV <olinger at bellsouth.net>
> Subject: Re: [Elecraft] RF-Gain & S-Meter (again)
> To: "Mike Morrow" <kk5f at arrl.net>
> Cc: elecraft at mailman.qth.net
> Date: Sunday, May 29, 2011, 2:33 PM
> 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.
> >
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