"Cecil Moore" wrote in message
. net...
wrote:
My main question about the use of a GDO is how high in
frequency can a practical GDO get
to in frequency and still oscillate, couple to a similar frequency
resonant system and be able to observe a
"dip".

My cheap Knightkit GDO meter goes up to
300 MHz with a single wire loop for the
coil.
--
73, Cecil http://www.w5dxp.com

And, my Measurements Corp Grid Dip Meter goes up to 420 MHz.

Jerry