[Milsurplus] E. H. Scottr RCH or SLR-F?

[Dave Merrill]

>On Tue, Jun 01, 2004 at 12:58:28PM -0500, Dave Merrill wrote:
>> Suppose local oscillator radiation is the basis of this technology?
>> Hard to see how else it could be done.
>> 
>> http://www.sacbee.com/content/news/story/5349258p-6338265c.html
>
>Most likely. See Peter Wright's book _Spycatcher_ for how MI5 did it: 
>very, very sensitive TRF receivers, if I recall correctly.
>
>I expect that it's _loads_ easier on the freeway, with all those LOs
>shrieking: just scan the spectrum for highest power, and change the
>display content to suit. Judging by all the 10.7 MHz IF leakage I get
>in my van, the average car radio is about as well RF-shielded as the
>average Zip-Loc bag. It seems much easier in most ways than trying to
>find the spy receiver with non-standard IF, though I suspect one might
>have to use rather wide frequency buckets because any given receiver's
>LO could be off a bit.
>
>The only problem I see is deciding whether to scan for a low LO (RX
>uses sum frequencies) or a high one (RX uses difference frequencies),
>and it's easy enough to scan for both.
>
>-- 
>Mike Andrews
>mikea at mikea.ath.cx
>Tired old sysadmin 

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