[Milsurplus] Re: DFing receiver re-radiation in WW 2?

[Rbethman]

Actually, it has been underway for a WHOLE lot longer.  Our friends, the 
British, had trucks running around for decades finding those watching TV 
without paying their taxes.

I don't know if they still do or not.  But it CERTAINLY isn't NEW!

Bob - N0DGN

Radioman390 at cs.com wrote:

>In a message dated 6/28/04 12:06:10 PM Eastern Daylight Time, 
>BOEING377 at aol.com writes: 
>  
>
>>There was apparently a lot of concern in WW 2 about receivers radiating 
>>signals that would give away their presence and possibly allow direction 
>>finding by 
>>enemies.  Some had special circuits to suppress such radiation before it 
>>could reach the antenna (e.g., ARR 7).  Did the US or its enemies have 
>>special 
>>gear for DFing receiver reradiation? I really doubt that standard DF gear 
>>would 
>>do the job. 
>>    
>>
>
>A TV ratings company introduced a truck which would drive down the street and 
>could tell what TV channel was being watched by its radiated signal (local 
>oscillator?).
>
>Another ratings firm put up receivers alongside roadways to measure in-car 
>audiences. Although with many $300 Toyotas with $4000 sound systems, your ears 
>will do a good job in IDing the station, even from afar.
>
>Currrently, low radiation devices are required in many applications; the 
>standard is called "Tempest"
>  
>

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