A manually tuneable television set makes a good "first sniff" EMI test 
receiver. Here you can still get very cheap small semi-portable black 
& white receivers which require you to manualluy tune to each station. 
They do not cover continuous frequencies between bands alas but are 
stil usually able to give a good first indication of RF outputs.

For tv reception the manual tuning is a real pain. For use as an EMI 
receiver it's excellent. You get both visual and audible indications 
of RF output. If there's any doubt whether a signal is coming from uor 
equipment turning it on an off usually tells you. If it's still making 
signal when turned off you should instead be selling alternative 
energy power generators :-).


        Russell

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