As with most modern radios, the RF gain control is actually an IF gain control
that scales the signal level mathematically at the input to the DSP. It's often
used by operators who like to manually control the level of signal ahead of the
DSP AGC.
This is different from "hard" front-end gain adjustment, which in the K4 is
handled four ways:
- preamp settings
- attenuator settings
- *automatic* gain reduction via preamp/attenuator settings
(if enabled in the menu)
- carrier operated relay (COR)
You have control over preamp/attenuator settings, and you can enable or disable
automatic gain reduction. But the COR is handled independently. It kicks in
automatically whenever the signal into the antenna jack exceeds something like
+25 dBm.
73,
Wayne
N6KR
> On Jul 3, 2022, at 7:19 AM, Roy Morris, Jr. via Elecraft
> <elecraft@mailman.qth.net> wrote:
>
> Considering the high noise level on the 75 meter band, has anyone had to use
> both 21 db of attenuation with PRE/ATTN button and additional attenuation
> with the RF/SQL encoder? All illustrations have shown the RF/SQL encoder set
> to zero (default), Is the RF/SQL encoder to be used only for squelch? Under
> what conditions is it used for RF if not for attenuation? Thanks, Roy
> Morros
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