[Elecraft] KX2 on JT65 & JT9 ??

[Tony Estep]

>
>
> Issues with not being able to communicate with JT65 have nothing to do with
> frequency stability....

===========
Actually, frequency stability is the key issue with JT65. The transmit
frequency can not drift more than about 8 hz during transmission, or the
receiving station will probably not be able to copy. It was this exact
issue that led to the development of the temp compensation scheme for the
KX3. The point of the original question was to determine whether or not the
KX2 needs such a compensation routine, or is stable enough as shipped.

If you run a KX3 without the compensation you may think they can't hear you
when actually the problem is in the small drift in your transmit frequency.
I first discovered this when running WSPR on the KX3 and listening to
myself on a nearby K3. The graphic display of carrier frequency offered by
WSPR made it clear what was happening. My stock KX3 drifted by about 14 Hz
in the first half-minute or so of transmission. Contacts on JT65 were not
impossible, but they were rare, as were WSPR reports.

You can search the archives for many, many posts on this subject, and look
on the Elecraft website for the recommended fix, which involves putting
your KX3 in the fridge, then running a compensation routine while you warm
it up with a heat gun.

Meanwhile, I would be interested to know the answer to the original
question, as I am sure many others would be as well.

Tony KT0NY