i use my GD-meter when building antennas and tuning
antennas and traps to frequency. Although
the calibration is quite inexact, it's always possible
to listen to the GD-meters frequency on the
receiver.

"Paul Burridge"
On Sat, 15 Nov 2003 17:23:50 -0600 (CST),
Turner) wrote:
THERE MUST HAVE BEEN SOMETHING WRONG WITH YOUR
MILLEN. BILL T.

I'm not using a Millen and this post isn't a troll as
someone else
suggested. The meter I use started out life as a
Tradiper (Japanese)
but because it was hopelessly outdated and used old
germanium trannies
with enough lead inductance to tune a VoA transmitter,
I decided to
rip its guts out and rebuild from scratch.The actual
chassis/meter/facia etc was quite high quality, so it
made sense.
I got this nice circuit from the UK equivalent of the
ARRL Handbook
and set about building it. It used 2 SK88 FETs and the
output of this
oscillator could be adjusted to keep its impedence as
high as poss for
each test, thereby giving really good dips when even
quite heavily
loaded low Q circuits were tested *provided* they were
physically big
enough to shove the sense coil into. The sense coils
are about 3/4" in
diameter, which although fine for large,
out-of-circuit component
measurements, is *hopeless* for getting in close on a
circuit board
with subminature components a fraction of the size.
That's the main
problem I face with all GDMs, though: they all seem to
have relatively
huge sense coils relative to today's component sizes
:-(