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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