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Re: Grid dip meter
Millen Manufacturing closed in 1977 (cost of OSHA requirements got them).
too, it was a quality operation staffed with quality people.
Tesla List wrote:
> Original Poster: "Ray von Postel" <vonpostel-at-prodigy-dot-net>
> >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
> grid dip
> 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
> bridges, r.f.
> 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"
> with the
> advantage that the meter on the instrument works as a resonance indicator.
> "Radio Instruments and Measurements" Bureau of Standards Circular C-74,
> several uses of the wave meter that are applicable to Tesla coils.
> Good luck.
> Ray von Postel
> Tesla List wrote:
> > Original Poster: Parpp807-at-aol-dot-com
> > Colin,
> > 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.
> > Cheers,
> > Ralph Zekelman