[Elecraft] K4D Receiver Question

[Wayne Burdick]

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 at 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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