[Milsurplus] Mechanical Modulator

[Thomas Adams]

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
>
>______________________________________________________________
>Milsurplus mailing list
>Home: http://mailman.qth.net/mailman/listinfo/milsurplus
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:Milsurplus at mailman.qth.net

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.