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Re: Grid dip meter
>From the "Radio Amateurs Handbook" 1959 edition. Catalog Section
James Millen, Malden Mass.
Grid Dip Meter No. 90651, 1.7 MHz to 300 MHz
This unit came complete with coils to cover the above frequency range.
Additional Inductors for Lower Frequencies
No. 46702_ 925 to 2000 KC
No. 46703_ 500 to 1050 KC
No. 46704_ 325 to 600 KC
No. 46705_ 220 to 350 KH
While not advertised in the catalog, Millen made a set consisting of the
and all of the coils from 300 MHz to 220 KHz all in a metal case.
The Millen line of products not only had the GDM, but oscilloscopes, antenna
power amplifiers, variable frequency oscillators and other goodies and
for radio. Millen products enjoyed a reputation for quality.
Sorry I don't have any prices.
The Millen unit, with the power turned off, works well as a "wave meter"
advantage that the meter on the instrument works as a resonance indicator.
"Radio Instruments and Measurements" Bureau of Standards Circular C-74, shows
several uses of the wave meter that are applicable to Tesla coils.
Ray von Postel
Tesla List wrote:
> Original Poster: Parpp807-at-aol-dot-com
> You can find GDMs on e-bay but you will probably have to wind your own coil
> to get below 1.7 mHz. Also, check the ARRL and GBRH for construction
> A GDM is a handy gizmo. :-))
> A sig gen with a VTVM or oscilloscope also work.
> Ralph Zekelman