[Elecraft] K3 and KX3 AGC settings and what the really mean.

[Wayne Burdick]

Hi Ron,

I'll be documenting these better in the next KX3 errata. In general we  
recommend using the defaults. Here's a quick summary:

> AGC Decay: soft

No equivalent in the KX3. In fact probably not needed even in the K3  
thanks to recent K3 and KX3 AGC improvements.

> Hld: 0.2 (AGC HLD, default 0)

Hold time in seconds for voice-mode AGC. This prevents AGC decay for a  
specified time, which some SSB ops like.

> Pls: nor (AGC PLS, default NOR, just added with the 1.01 MCU release)

Noise-pulse rejection. Prevents the AGC (and S-meter) from charging up  
on one-shot noise events. Try turning a noisy florescent lamp on/off  
right next to the radio; with AGC PLS set to NOR, the KX3 should  
suppress the usual long-decay S-meter response to such pulses. Set it  
to OFF if you want to see what happens to most radios :)

> Slp: 0 (AGC SLP, default 15 on the KX3)

The higher the slope number, the "flatter" the AGC response is. With a  
high setting of slope, signals above the AGC threshold will be held  
very close in audio amplitude even if they vary by many S-units at the  
RF input.

> Thr: 20 (AGC THR, default 5 to 7 depending on firmware release)

This specifies the threshold at which AGC starts to "attack". A higher  
number moves the threshold up.

> F: 200 (AGC FST, default 120; or AGC SLO, default 20)

Specifies the decay rate for AGC slow or fast as selected by the AGC  
switch on the K3 or the AGC SPD menu entry on the KX3. A larger number  
means a faster decay rate.

> AF lim: nor 030 (AF LIM, default 30)

Sets the audio limiter threshold used when AGC is turned OFF. Not yet  
implemented in the KX3.

Wayne
N6KR