"Frank Gilliland" wrote in message
...
On Sun, 27 Mar 2005 20:55:46 -0500, "Leland C. Scott"
wrote in :

snip
I really don't think it's worth the effort since the PLL can track any
minor drifting that would require retuning of a state-variable filter.

I would think you could use the PLL directly by keeping the VCO frequency
range narrow. The loop filter doesn't have to be anything that complex,
state variable that is.


I tried the state variable filter as a stand-alone device, not as a
PLL filter. Although it might be interesting to see what happens when
it -is- used as a PLL filter -- probably get all kinds of FM and
intermod distortion......

The filter should control the speed of phase locking to some extent and will
also help to remove phase noise from the signal you're trying to lock too,
but for your use that doesn't really matter.


--
Leland C. Scott
KC8LDO

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