[Elecraft] update on: ARRL 10m and K2 drift

Sun Dec 22 17:24:00 2002

Here a quick update. Today I played a bit in my "lab" (my YL calls it "messy
room"): calibrated C22, run CAL PLL and CAL FIL. Then I TX- and RX-ed with
K2 and Omni VI+ and vice versa and I still had 100Hz offset. Another quick
e-mail-exchange with Tom, N0SS, shed some light behind the problem. My
CW-Filters are centered at 700Hz and my sidetone was at 600Hz (St P 0.60).
Both MUST be the same! Read more in the "Owner's Manual" (Rev D) on page
94 - "Sidetone Pitch and Receive Offset".

73 and happy holiday de Dominik, HB9CZF

> Message: 15
> Reply-To: "Dominik Bugmann" <[email protected]>
> From: "Dominik Bugmann" <[email protected]>
> To: <[email protected]>
> Date: Mon, 16 Dec 2002 17:51:49 +0100
> Subject: [Elecraft] ARRL 10m and K2 drift
>
> Yesterday was my KPA100 + KAT100 test day. Both house in an EC-2 and K2 is
> #1062.
> QSK is really great an in the morning I could hear my backscatter and
people
> who wanted to steal my QRG. They never succeded :-)
> 100W and 400 QSO in 4 hours brings the PA temperature to about 50C
(measured
> with my hand) and it stayed there.
> KAT100 brought my SWR down since the trap-beam has 2:1 at 28050.
>
> Sunday morning when I arrive in my contest-shack the room-temperature was
> 11C (C not F). For QSO direction JA und UA9 I had to move RIT to +50 Hz.
In
> the afternoon - roomtemperature was now up at 23C - and I was running
> stateside on 28088. For the average QSO I had to turn my RIT to -150
.. -180
> Hz and I can tell some W6, W7, VE6, VE7 were weak and you need to know
where
> zero beat is!
>
> After reading several posting about "drifts" I guess the BFO modification
is
> my next project. Anyway I was a bit surprised that my K2 drifted almost
> 200Hz (11C to 23C room temp and K2 idle to K2/100 in full action). In
summer
> time I'm very active on 10 Ghz Rainscatter and even at this high frequency
I
> can hold my QRG to 100Hz (temp controlled OCXO).
>
> Well, I still love my K2, because I build it, perfect QSK, loads of
goodies,
> QRP & 100W and even KAT100 in such a small space.
>
> Cu in RAC and 160m Contest with K2/100 !
>
> 73 de Dominik, HB9CZF
> http://www.qsl.net/hb9czf
>