[Elecraft] KX2 on JT65 & JT9 ??

[Wayne Burdick]

Lyle is on vacation and didn't get that memo. He's above and beyond the call of duty posting at all :)

Also note that the latest production KX3 RF board (rev. E) has the synth circuitry a lot farther from the PA and driver. This significantly reduced the thermal gradient. (The other major Rev. E RF board improvement was tighter 17/15/12/10 meter band-pass filters. These were inherited by the KX2 as well.)

Wayne
N6KR 



On May 29, 2016, at 8:50 PM, D Howard <va3ma at me.com> wrote:

> Lyle
> Such data would be very beneficial.
> And result in more KX2 sales - ha if that could be handled!!
> Note that Wayne just posted that a temp comp procedure will be posted.
> Dan VA3MA
> 
>> On May 29, 2016, at 11:45 PM, Lyle <kk7p4dsp at gmail.com> wrote:
>> 
>> The local oscillator design of the KX2 is very different from the KX3, as are the thermal isolation of the oscillator from the PA and the high current paths in the radio.  There is as yet no field temperature compensation procedure available for the KX2 nor is it clear that one is needed.  At least one  KX2 field tester operated JT65 successfully with the KX2.
>> 
>> There are enough KX2 radios in the field now that it should be a simple matter for an owner to measure the stability of the radio in this mode and report the results to the group to satisfy the curious...
>> 
>> 73,
>> 
>> Lyle KK7P (on "vacation")
>> 
>> Sent from my iPhone
>> 
>>> On May 29, 2016, at 8:14 PM, Dan - VA3MA <va3ma at me.com> wrote:
>>> 
>>> Luke
>>> Thanks - just what I needed to know!
>>> Have you tried JT9 ?
>>> Perhaps some sort of heatsink/handles added to the case might help??
>>> 73
>>> Dan VA3MA
>>> 
>>> 
>>> On 2016-05-29, at 22:37, Luke <aurich85 at yahoo.com> wrote:
>>> 
>>> Hmm, not sure why it cut out my message. Here's what I wrote:
>>> 
>>> I've used my KX2 on WSPR and JT65 and it appears to be plenty stable. I used to have a KX3  and sold it because it wouldn't decode WSPR between transmit cycles due to excessive drift. I've kept the KX2 to <5 watts because the right sideplate gets very hot with the high duty cycle.
>>> 
>>> I've actually just been sitting here running JT65 @ 10 watts when I got your email, and it is doing pretty well. I had 3 back to back QSO's and on the last transmission the PA Temp got up to 47C (~117F) which doesn't seem too bad. As it cools off there is no drifting or slanting of signals on the waterfall either. I think the 1 minute on/off duty cycle of JT65 is very doable with the KX2, and WSPR might be pushing it. The other night the sideplate got quite hot running WSPR at 5 watts.
>>> 
>>> Luke
>>> AD0KI
>>> 
>>> 
>>> From: Dan - VA3MA <va3ma at me.com>
>>> To: Luke <aurich85 at yahoo.com> 
>>> Sent: Sunday, May 29, 2016 8:12 PM
>>> Subject: Re: [Elecraft] KX2 on JT65 & JT9 ??
>>> 
>>> Luke
>>> No content????
>>> 
>>>> On May 29, 2016, at 8:51 PM, Luke via Elecraft <elecraft at mailman.qth.net> wrote:
>>>> 
>>>> 
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