The Eternal Squire wrote in message ...
....
1) If I adjust the top frequency in the VCO slightly, I have
a DC reading frequency meter. If I scale the VCO and DC output
correctly I could read 2.100 to 2.150 Mhz reading as .100 to .150
Volts, and so can display frequency digitally without needing the
expense of a frequency counter, only a cheap DMM module.

Seems like a complicated way to do it, and it will have only the
stability of whatever analog components you're using. Why bother,
when a counter can be as cheap, fewer smaller parts, and have crystal
stability? See also various F to V converters if you really must do
it with analog; I think Jim Williams and Bob Pease have both published
some good work on them.