Steve Ward wrote:
>
> I have noticed that with my setup the power level varies greatly depending
> on where in the passband I'm transmitting. In other words if I setup HRD
> to work a QSO on a lower frequency (say between 800Hz and 1000Hz) I get a
> much higher indicated power output than if I work at the center (1350Hz)
> or higher. I just figured this was due to the frequency response of my
> soundcard (SignaLink USB) and or the accuracy of the power output meter at
> different audio frequencies. I'd appreciate hearing others' thoughts on
> this too!
>
>
You might expect that if you did not have enough drive level due to trying
to use the audio level to control the power output. If you set it up as
decsribed with 4 or 5 bars of "ALC" then the power control should give you a
constant output until you get to the really steep part of the passband. I
use the quotes deliberately - as I understand it the meter is not actually
measuring ALC when in DATA A mode. Certainly I do not observe any adverse
reading on my IMD meter when set up this way, with the power control set for
40W output.
Having said that, I prefer to operate at the "sweet spot" in the center of
the passband. The wonderful program Fldigi has a handy QSY button that
shifts whatever signal you are receiving to that point, so you can then dial
in a narrow filter and get the best possible copy.
-----
Julian, G4ILO. K2 #392 K3 #222.
http://www.g4ilo.com/ G4ILO's Shack http://www.ham-directory.com/ Ham
Directory http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3
--
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