K3: AGC question

[k7svv]

While checking the problem that someone reported a little while ago with the
S meter being stuck when the AGC is turned off, I noticed that  I don't hear
any difference in the received signal when I turn AGC off and on.  I have
tried it with an S5 CW signal, an S9 SSB signal, and 40 over 9 signal on the
AM broadcast band.  I would expect each of these signals to much louder when
the AGC is switched off but I hear no change at all.  Strange, it is like
the AGC is not being turned off.  How about the rest of you fellows, what do
you hear?

John    [K7SVV]

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[Julian, G4ILO]

John [K7SVV] wrote

While checking the problem that someone reported a little while ago with the
S meter being stuck when the AGC is turned off, I noticed that  I don't hear
any difference in the received signal when I turn AGC off and on.  I have
tried it with an S5 CW signal, an S9 SSB signal, and 40 over 9 signal on the
AM broadcast band.  I would expect each of these signals to much louder when
the AGC is switched off but I hear no change at all.  Strange, it is like
the AGC is not being turned off.  How about the rest of you fellows, what do
you hear?

Didn't I read somewhere that in the architecture of the K3, the AGC only operates when necessary to prevent the DSP from being overloaded? So perhaps you are just not listening to strong enough signals for it to have an effect.

[dj7mgq]

 > Didn't I read somewhere that in the architecture of the K3, the AGC
 > only operates when necessary to prevent the DSP from being overloaded?

This refers to the hardware AGC.

In the case of the strange AGC behavior, I would think the the digital
AGC is meant, which is "only" math in the DSP code.

vy 73 de toby
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