[Milsurplus] LO DFing, the myth that never dies!

[James Duffer]

While stationed in Germany in the 60's there was a tax on TV's and there was a van that went around that would detect a television receiver in the German's residence for taxing purpose.  The government housing was of course exempt. Apparently the TV's Local Oscillator was strong enough to be detected.

> From: RAFANTINI at salisbury.edu
> To: milsurplus at mailman.qth.net
> Date: Wed, 2 Dec 2009 14:11:10 -0500
> Subject: [Milsurplus] LO DFing, the myth that never dies!
> 
> With the development of the superhetrodyne receiver, modern style multi grid tubes, and the minimal amount of shielding between stages that almost every commercial or military receiver had by the mid thirties not to mention active RF stages that provide isolation from the mixer find it highly unlikely that much can be obtained or be of use from embassy listening at a distance of over several feet. Maybe in the teens and twenties when they still used regenerative receivers or some bread board triode stuff but not beyond that.
> Ray Fantini KA3EKH
> 
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