[Elecraft] KX3 Extended VFO temperature compensation procedure

[Phil Wheeler]

At this point I wouldn't characterize my 
experience as a concern. So far as I can tell the 
calibration worked well, though I was surprised to 
see the tone vs. temp behavior above about 45 
deg-C. My impression is that the calibration is 
done with a table, so such nonlinear behavior 
should not be an issue, so long as it is 
repeatable. The post by Bob, WB4SON early today in 
this thread described some "crazy" behavior which 
would concern me.

Of more concern in such modes might be the power 
limitation at higher temps. There is some 
temperature at which the PA power will be limited. 
I don't know if that limit is of concern for JT65 
operation or not. I know there have been 
discussions in the Yahoo KX3 group about different 
ways to add cooling to the KX3 for portable ops -- 
including fans, larger heat sinks with fins, and 
in one case leaning a cold cooler against the rig.

73, Phil w7ox


On 3/18/14, 11:39 AM, Jack wrote:
>
> I have been following this thread with interest.
>
> Given our change in living arrangements, from a 
> house with plenty of space for antennas to an 
> apartment with no place for antennas, we are 
> forced to do mobile and portable operation. In 
> that case we can no longer easily operate our 
> K3/P3 and have been considering getting a KX3 
> instead. This thread causes me to wonder if this 
> would be a good idea since one of the things we 
> would want to do, while operating portable, are 
> various digital modes, including JT65.
>
> Is this VFO temperature compensation problem 
> serious enough to make reconsidering the KX3 wise?
>
> Thanks,
>
> Jack, W6NF/VE4SNA