[Milsurplus] Radiating receivers

[Ralph Cameron]

I recall some lengthy discussion about receiver oscillator radiation 
being detected and breeching security or radio silence. This discussion 
occurred last year.

Just to add fuel to the fire, I ran across this article in an issue of , 
"RADIO" for September, 1942.

" Low Radiation Receiver"
The elimination of one direct cause of American ship losses was made 
possible recently by the introduction of a new  low level radiation 
radio receiver made by the E.H.Scott Radio Laboratories, Inc., Chicago, 
Illinois. Unlike ordinary radios (large or small) this specially 
designed set gives off no signal detectable by enemy direction finders, 
and it thus foils subs and ships which have heretofore been able to 
track down our boats from distances of 100 miles or more away simply by 
listening to the constant oscillator radiation sent out by entertainment 
radios aboard them. The new Scott marine Model SLR 12-A eliminates this 
danger to shipping by cutting oscillator radiation to the point of 
absolute safety. It has full approval from the FCC. " 


73

Ralph, VE3BBM