[Elecraft] KX2 on JT65 & JT9 ??

[Edward R Cole]

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
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