Richard Ferch wrote:
>
> Well, I'll be doggoned!
>
> Thanks, Joe - I seem to recall reading that somewhere, but I hadn't really
> taken it in, and I was still using the procedure that worked with my
> previous radio.
>
> If I set the K3's requested power to 100 watts, then with 0 bars ALC I get
> IMD well below -30 dB, but with even 1 bar it rises to -26 dB, and gets
> worse with more bars. At the same time, the average transmitted power
> rises
> above 50 watts - clearly the peaks are getting into compression.
>
> However, if I set the requested power to 50 watts, I can push the ALC
> right
> up to 4 or 5 bars while the average transmitted power stays at 50 watts on
> a
> two-tone signal and the IMD stays below -30 dB. That's a safer and easier
> way to operate.
>
> So now to remember: in modes like CW and RTTY set the requested power to
> 100w, but in PSK and other similar modes cut it back to 50w. I can
> probably
> figure out a way for my digital-mode software to remember this for me and
> do
> it by software control.
>
> Actually, I think I'll set it to some other number, such as 40w, to lessen
> the risk of inadvertently recalibrating TX gain by hitting the TUNE
> button.
>
> Thanks again, Joe.
>
>
I operated for years with a QRP K2 and used 5W on PSK31 and there were
surprisingly few contacts that I couldn't make it. Now I have the K3/100 but
it simply never occurred to me to wind the power up to 100W. I don't see the
point in getting the PA so hot so quickly. I never set it to more than 40W,
and at 25W it runs noticeably cooler and doesn't seem to make much
difference to the signal report.
-----
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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