[Elecraft] 1 Hz setting?

[Bill W4ZV]

Paul Saffren N6HZ wrote:
> 
> The XG3 has 1 Hz resolution over it's fundamental range of 1.5 to 200 MHz.   
> The calibration should be done at 10 MHz as this is the frequency of the
> internal crystal.  The values entered for the calibration values do not
> necessarily produce a linear increase or decrease to the output frequency. 
> This is due to how the calibration factor is used in the computatation of
> the output frequency.  You can however get pretty close and then fine tune
> as needed. 
> 

I believe we're confusing the XG3's resolution (1 Hz) with calibration
settability (a few Hz at 10 MHz).  The XG3 indeed has 1 Hz resolution but
mine is not settable to 1 Hz.  Using WWV at 10 MHz, my factory supplied cal
constant is -529.  With that constant my XG3 is only off by 1-2 Hz but I
cannot get it any closer.  There's no change in the XG3 from about -534 to
-524 cal settings, but then it jumps to about 4-5 Hz off.  

This isn't a big deal to me but you might want to add some explanation to
the manual.  I don't expect a product in this class to rival an HP 8640! 
:-)

73,  Bill

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