Re: Grid dip meter

["William R. Langston" <blangsto-at-iwvisp-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Millen Manufacturing closed in 1977 (cost of OSHA requirements got them).
Too bad
too, it was a quality operation staffed with quality people.

Bill Langston

Tesla List wrote:

> Original Poster: "Ray von Postel" <vonpostel-at-prodigy-dot-net>
>
> Colin:
>
> >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
> meter
> 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
> components
> 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,
shows
> 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
> articles.
> > A GDM is a handy gizmo. :-))
> > A sig gen with a VTVM or oscilloscope also work.
> >
> > Cheers,
> > Ralph Zekelman