[Elecraft] KX3-2M module?

[Oliver Dröse]

Hi Dave,

for me the most important reason to buy the KX3 was the 2 m option, too. 
If Wayne says the frequency will be stable +/- 3 Hz I think nobody will 
hear that in CW/SSB, you will not even recognize, be it in a contest or 
while working D4 on double hop ES on 2 m. ;-) Likewise with "normal" 
transverter use on 10 GHz which we plan to do, too (if the LO is stable 
enough ... you know there are 2 factors influencing things: freq 
stability of the KX3 itself which the temp correction takes care of 
*and* LO stability in the KX3-2M transverter itself).

JT65 could be a different matter if the frequency will be corrected 
every second or such. Even then it might be good enough. +/- 3 Hz is 
well within the tolerance of JT65. What might be a problem is that 
JT65's tolerance is for drifting signals, not "jumping" signals. So we 
will have to see how that works. For comparison the frequency 
stabilization of the K3+K144XV with the K144RFLK is using a comparable 
method and I do not have problems on JT65b. But "comparable" is not 
"similar", of course, i.e. no temp curve correction from memory but a 
real reference lock. Nevertheless the final effect seems to be the same 
for me. Maybe Wayne can shine in on that point again.

73, Olli - DH8BQA

Contest, DX & radio projects: http://www.dh8bqa.de


Am 08.04.2014 23:58, schrieb Dave:
> ----- Original Message ----- Sent: Tuesday, April 08, 2014 9:39 PM
> Subject: Re: [Elecraft] KX3-2M module?
>
>
>> Hi Gil,
>>
>> It is for WSJT EME digital modes (JT65b) that the short term 
>> frequency drift problems really matter for me. No problem for SSB/CW 
>> regular work I imagine, after the extended temperature calibration of 
>> the VFO in KX3.
>
> Please don't do us "ordinary" CW users down.  I use 2M CW for 
> Sporadic-E, Aurora, and even some tropo work where you do need to be 
> able to keep on frequency over at least a few moments...
>
> The more I see, the more I realise that the promised 2M unit is going 
> to be a very poor option for people who use VHF and UHF seriously.
>
> I have re awakened my use of HF, but I did buy the Elecraft KX3 with 
> the promise of a decent 2M option.
>
> Where do I apply to return my KX3 for a full refund ?
>
> Dave (G0DJA)
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