One of the most
frequent topics
for discussion
among the many
‘Home Brewers’
on the amateur
bands is the difficulty
of building
a VFO that is
stable enough to
be used on all of
the HF bands.
The relatively
simple circuit
described here
will stabilize the
frequency of an
HF VFO, and
provide a digital
frequency display.
The display will
allow for the different
frequency offsets
required for USB and
LSB, and the fact that
the VFO frequency
may be above the
signal frequency on
some bands, and
below it on others.
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