I ran extensive frequency drift measurements on the KX3 in 2014,
purchasing an aftermarket heat sink for my KX3. After running the
temperature compensation procedure I reported:
I re-ran the JT65 testing sequences to measure frequency drift
after temperature compensation was done.
Initial sequence shows the most drift with a peak +13 Hz upwards
drift in the first sequence. The remainder
Showed under 10-Hz with the delta trending to +5 Hz in later sequences.
Testing was done on 50-MHz which would show the most drift; I did not
check for HF drift which one would expect to be proportionally less.
http://www.kl7uw.com/KX3.htm
Data is displayed on some charts accessible by link from main page.
I also acquired the heat sink produced by Elecraft but have not tried
it considering the one I previously purchased has much more thermal
mass. Drift before adding heat sink and performing Temp comp. was
103-Hz accumulated over 20-min test of running key-down in CW for
50-seconds followed by 70-seconds in Rx, repeating ten times.
I use a professional frequency counter usable to 26-GHz whose TCXO
appears stabile against a Rubidium reference.
I have not run the KX3 on JT65 very much (a little on 6m a couple
years ago); haven't built IQ interface. I have a K3 with EXREF
running 2m-eme and 23cm-eme with transverters so the KX3 gets used
for other kinds of use. I have the 2M board installed. Haven't
checked drift on 2m with it.
Reading the mail to see what will be reported for the KX2.
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[email protected]
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