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Ciao Paul many thanks for your reply.
Interesting things you said to me about MI5!
ciao

2014/1/24 Beaumont, Paul <p.beaum...@imperial.ac.uk>:
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> Some of us already use triangulation to prove the point of transmission.
>
> MI5 has/had a system codenamed RAFTER that allowed them to intercept the 
> product of the master oscillator and mixer  of receiver used by the agent so 
> that they could prove reception of NS. It was this system that featured in 
> the prosecution of Gordon Lonsdale one of the Portland Spy Ring.
>
> Cheers
> Paul
>
> -----Original Message-----
> From: spooks-boun...@mailman.qth.net [mailto:spooks-boun...@mailman.qth.net] 
> On Behalf Of Gian Romani
> Sent: 24 January 2014 10:18
> To: spooks@mailman.qth.net
> Subject: [Spooks] FIRST QUESTION ON NS
>
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> Good morning. This is my first question:
> It has been said many times, and now is given to established, that these 
> transmissions are to be received by agents located throughout the area and 
> that one of the strengths of this system of communication of messages is the 
> fact of not having to use special devices to be able to receive. Infact, as 
> we have always said, we just need a shortwave radio, cheap, small and 
> convenient, that does not arouse suspicion. I noticed that in many cases it 
> goes on the hunt for signs of Numbers Stations with instrumentation, and 
> especially antennas, complex and huge, which will surely help to receive 
> distant signals but in my opinion are not logical to use for receipt of NS. 
> That is, I mean, to understand exactly where they come from and who they are 
> eventually destined for the messages, it is useless to resort to huge 
> antennas and professional receivers because I think that we don't have to 
> hunt for the signal to reach the source, we don't have to go as far as 
> possible, but we have to le
 t
>  the signals come to us. Agents who have to receive messages don't use 
> professional receivers and big antennas to wire all over the garden or on the 
> roof. If it's true that agents use little receivers and antennas, with 
> similar devices monitors have to try to find the signals. It is obvious that 
> a SWL with such powerful devices can hear even really far signals, but this 
> is not in the intention of NS programmes. The sense of NS, if we want to 
> understand something more, is to receive them with the same devices used by 
> agents. A signal sent for example from Russia for agents located in Italy is 
> easily receivable with professional receivers and wire antennas cut for the 
> right band. But to understand exactly who it is for that message need trying 
> with domestic receivers and antennas.
> If the signal is perfectly received all over Italy it means that signal is 
> potentially routed to agents in Italy. If in Italy, with domestic devices, 
> that signal is not receivable, it means that message is not intended to 
> agents in that area. To try to understand where they came from but also where 
> they have to go then is useful to try to do triangulations reception operated 
> by monitors located everywhere and can operate with the same home equipment. 
> Just so we can groped to identify areas of sending/receiving messages. It is 
> correct my idea?
> Do you agree with this point of view?
>
> Bye, Naig
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