[Elecraft] KX3 Temperature Compensation

[Don Wilhelm]

Hans,

While the KX3 is sufficiently stable for FT8 on 160 thru 10 meters, I 
believe it is marginal on 6 meters - but that depends on the power level.

Look at the temperature rise during an FT8 transmission - it should be 
much smaller than your drift from 52C to 38C.

The "cure" for temperature rise during transmit is to reduce the power 
output, or put an aftermarket heatsink on the KX3.

73,
Don W3FPR

On 7/6/2018 6:50 AM, Hans J Rasmusen OZ7BQ via Elecraft wrote:
> Hello,
> Thanks to Gary of Elecraft I have been able to perform the temperature compensation procedure on my KX3, sn 18xx.However, because it is a rather time consuming process, I would appreciate advice on when the compensation is good enough for FT8 on 6 meters?
> My measurements indicate that the frequency drift now is approx. 50 Hz when the oscillator temperature increase from 25C to 52C. Most of the drift happens between 45C to 52C. As far as I can measure there is about 25 Hz hysteresis during cooling down from 52C to 38C (where the stand by temperature stabilize).
> I can make FT8 contacts, but 6 M conditions are currently marginal here, so performance is difficult to evaluate.
> Do I have to do the compensation one more time?
> 73 OZ7BQ, Hans Jørgen
> 
> 
> 
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