[Elecraft] Re: Mod for more AF gain on K2

[Leigh L. Klotz, Jr.]

Although I had adjusted it to 3.80v, when I checked the AGC voltage, I 
found it had crept up above 3.9v.
Since the adjustment happens early on in construction, it's likely that 
the pot got bumped later.
This sequence of calibration could be a cause of reported low audio 
level in 3000+ K2's.
I would recommend adding a reminder in either Part II or Part III 
Alignment to check the AGC voltage.

Right now I have mine set at 3.50v but reading Don Wilhelm's message of 
07/30/04, that may be a bit too low.
I can, though, confirm Don's assertion that listening for a change in 
band noise with AGC Off is best done on a high band, not on 80 meters.  
(Ouch!)

73,
Leigh WA5ZNU

Wayne Burdick wrote:

> AF output can be increased in less drastic ways. Here are my favorites:
> ...
> - Adjust the AGC threshold so that it isn't activated by low-level 
> band noise.
>   (First, turn AGC OFF by holding PRE and ATTN. If the background 
> noise comes up,
>   you may have the AGC pot set too aggressively.)