[Milsurplus] Mechanical Modulator

[J Forster]

This link might be of interest:

http://www.museumofbroadcasting.org/Wobbulator.html

Best,
-John

===================

Thomas Adams wrote:

> At 07:07 PM 9/13/2008, WB6BLV    (DM06) wrote:
> >The 'wobulator' I mentioned is not connected mechanically to any other
> >parts... it is nothing more than a variable capacitor driven by a voice coil
> >(as in a pm speaker); the voice coil displaces one of two plates (or one set
> >of two sets of plates in larger units) of the internal capacitor.  Audio fed
> >to the voice coil causes the capacitance of the wobulator to vary at the
> >frequency of that audio.  Being a mechanical device, the band of frequencies
> >to which the voice coil can respond is limited to the low audio spectrum.
> >Not bad for '30s amd early '40s technology, though, huh?
> >
> >Anybody know of wobulators being used in anything besides the APN-1??
> >
> >John
> >WB6BLV at inreach.com
> >
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>
> Ya know what astonishes ME about this whole thing?
>
> Who'd have thunk that there''s STILL so many folks around who know
> what the hell a
> "wobbulator" is???    <<GRIN>>
>
> Mr. T.