"Ted" wrote in message
...
On Mon, 03 Apr 2006 01:37:23 GMT, "Dale Parfitt"
wrote:


Hi Ted,
I quickly looked at the VFO schematic in my1994 Handbook that had the PR.
I
seem to recall in the end I replaced C1 with a short- just eliminating it.
Not 100% positive, but think that was what it came down to in order to
get
good linearity out of my VFO.

Dale

Dale,
I'll check that out. My value for C3 from the spreadsheet came out to
be 319.1 vs the 127.02 in the magazine. I used the spreadsheet on the
example on page 4.4 of EMRFd and it worked out ok. In the QST
example, setting C1 to a very low value actually increases the
discrepancy with C3, though. More mystery!

Tnx,
Ted KX4OM
Hi Ted,
No doubt, the VFO could be put on the correct freq range with C3 included-
it was just very nonlinear.

Dale