[Milsurplus] Mechanical Modulator

[J Forster]

It is from the APN-1.  In later life, these were also used in DC electrometers.

-John

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WB6BLV (DM06) wrote:

> I suspect the reference is to the 'Wobbulator" (spelling??) used on the
> APN-1 (I think) radio altimeter... the device is actually a voicecoil-driven
> variable capacitor with a fairly strong permanent magnet...  I have some
> here I picked up years ago at a surplus store in LA and I have had fun
> playing with them from time to time... they give fair audio FM and they make
> interesting sweep generator elements...
>
> John
> WB6BLV at inreach.com