[Elecraft] K3: KRX3 question

[Eric Swartz - WA6HHQ, Elecraft]

With two synthesizers, our software must calculate the proper PLL 
divider and reference frequencies for each one. When setting the sub and 
main to the same RX frequency, if the filter offsets set in the menu are 
different this can cause small rounding errors in the synthesizer 
frequency calculation math to place them a couple of Hz apart. (But 
-not- by the difference in offsets between the filters. We calculate 
most of that out.)

73, Eric  WA6HHQ
---


David Cutter wrote:
> Bill
>
> I don't follow how filter offsets degrade oscillator tracking, ie to 
> make a beat frequency.  Sorry if I'm being thick.
>
> David
> G3UNA
>
>
>
> What would be the effect of unmatched filters?  You would have a beat
> frequency, such as I mentioned with Orion above, which would be the
> difference in the two offsets.
>
> Even with identical offsets, you could also have interesting effects 
> if you
> used different bandwidth filters.  This might not necessarily be bad 
> since
> you could use both a wide bandwidth and a narrow bandwidth simultaneously
> (somewhat like DUAL PB presently in the K3 but with much more 
> flexibility).
>
> It will be fun to experiment with some of these things!
>
> 73,  Bill
>
>
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