Posted by
Sverre Holm on
Sep 15, 2004; 7:49am
URL: http://elecraft.85.s1.nabble.com/VCO-voltages-for-160m-band-tp370283p370286.html
Quoting
[hidden email]:
>
> I found that compared with the initial AGC
> threshold setting of 3.80V the level needed to give S9 on the K2 with the
> preamp
> off had dropped from 63uV PD to 25uV. This was after careful adjustment of
> the S LO and S HI required as per the K2 Alignment Instructions
I would recommend that you do this the other way around: adjust AGC setting
first for no decrease in level on a quiet band and then the S-meter settings
for approximately S9=50 uV. Otherwise you will mix the receiver's sensitivity
to quiet bands with S-meter sensitivity. My experience is that the following
works well:
1. First set CAL S LO as per the manual
2. Then adjust CAL S HI by setting RF GAIN to the 9 o'clock position
(instead of fully CCW) and set parameter so that right-most bargraph is
barely turned on. I have played with various other setting such a 10, 11
o'clock, but found the 9 o'clock position to be fine. It also agrees
reasonably well with 50 uV from my generator to give S 9.
If the AGC-setting is changed, the S-meter calibration has to be redone.
Sverre
LA3ZA
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