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

[Ray Fantini]

Not to be demeaning or as a insult but as a question that I would propose. If you receive the LO of another receiver what will that tell you? Assuming you know the IF frequency and if the receiver is signal or double conversion perhaps you can determine the operating frequency of the receiver but you cannot determine what if anything it is receiving. There is value to knowing that someone may be monitoring a given frequency but would assume once again by the mid thirties every intelligence agency assumes their radio traffic is monitored and what advantage is there to be gained in confirming this? And along this line all listening post set up to monitor embassy traffic are way more interested in traffic transmitted from the embassy as official traffic and possibly by covert devices they may have planted on the grounds. Perhaps if you think clandestine or agent stations are operating in your area and you know where the central receive site is you can then determine the operating frequency of the rogue station and this is what they were listening to? After you know the frequency of the rogue they can be plotted and located?
Ray Fantini

Let's stipulate that you're right, Ray. 

What were Peter Wright and his friends listening to, then, with their
specially-built TRF receivers?

-- 
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin 
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