[Elecraft] New K3 app note issued.

[Bill W4ZV]

Phil Hystad-3 wrote:
> 
> OK, how do I find out if I need this mod?   I have witnessed two different
> frequency shift problems, one of them I have posted here and there has
> been some discussion about it.
> 
> Problem #1 (posted before) -- when listening to CW, when the signal is
> reasonably strong such as S9 or better, if there is a slight pause in the
> sending there is sometimes a frequency shift on the order of 10 Hz to 40
> Hz.  I am guessing at the actual shift amount as it is a slight but very
> apparent shift in tone.
> 
> 
> Problem #2:  on a couple of occasions while operating PSK, there has been
> a slight shift in frequency, enough that my software is no longer tracking
> the signal (I use CocoaModem).  I am not sure how much a shift would need
> to be for CocoaModem to lose sync but it does lose sync.  This has
> happened a few times.  At first, I thought it was the other guy hitting
> his VFO or maybe some old tube rig that is has an unstable VFO but the
> last two times it happened I am pretty sure that it was me (and, my hands
> are no where near the VFO knob).
> 
> 
> By the way, as far as I know, in neither case above, does the VFO
> frequency readout change value.  For PSK, I keep my VFO pegged on
> 14070.150 Hz and I think I would notice if this changed.
> 

Neither problem.  This mod applies to a chirp in your transmitted signal,
usually when operating split.  It does not apply to received signals.  

73,  Bill

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