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.)
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