"W3JDR" wrote in message
...
Anyone know of a PIC-based frequency locked loop for VFO control? I'm
looking for something that can be programmed with a frequency word, and
then
it aquires and maintains the frequency. I've seen frequency 'stabilizers'
but most of them just hold the frequency once it's been manually set.
There
are also PIC-assisted DDS designs, but these are more complex thatn I
want,
use more power then I'd like, and are not as clean as a simple voltage
controlled oscillator.
It seems to me that the PIC should be able to measure the frequency,
determine the error, and operate a very simple charge-pump/VCO to put the
frequency where it wants.


I've seen a couple of MCU-controlled "Huff and Puff" stabilisers on the web.

You'll find a couple he

http://www.hanssummers.com/radio/huffpuff/contents.htm

Leon
--
Leon Heller, G1HSM

http://www.geocities.com/leon_heller