Unless I'm misunderstanding something here, the answer to your question
is pretty basic. There is a kink in the curve where the AGC kicks in.
Signals that traverse that kink see a nonlinearity.
I set the threshhold pretty high, and I set the slope as low as I can in
order to minimize the amount of that kink.
Dave AB7E
On 7/2/2020 5:09 PM, Wes wrote:
Please explain to me where this non-linearity is generated. If 1 volt
of RF (really I-F) gain reduction causes 10 dB of gain reduction, prey
tell what difference does it make if the 1 volt is generated by an AGC
circuit or a manual control? Either way, *all* signals are reduced 10
dB. What's non-linear about that?
Wes N7WS
On 7/2/2020 3:18 PM, David Gilbert wrote:
What are your AGC settings? I have a K3 with the new synths and I
use almost the least AGC possible ... THR = 12 and SLP = 000.
AGC creates non-linearity, the non-linearity is most pronounced at
the signal level where it kicks in, and non-linearity creates
mixing. Do the math for the sum and difference frequencies when you
have multiple signals very close to each other within the receive
passband.
73,
Dave AB7E
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