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Old 30th Jan 2021, 10:14 pm   #21
ms660
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Default Re: Transmission on IF frequency (AM)

Most of those UG observation posts would have been known to the locals of the area at the time they were being used, we knew where our nearest one was and some of the blokes that used it, it's still there today and the hatch is easily opened.

Lawrence.
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Old 30th Jan 2021, 10:23 pm   #22
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Default Re: Transmission on IF frequency (AM)

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Originally Posted by turretslug View Post
There were also various "nudge-nudge, it's true you know" tales around in the past of aircraft with standard IF receivers overflying areas of the country in the hope of winkling-out spy receivers but again, it sounds a bit of a forlorn hope in actual effectiveness- possibly another thing that a bright spark somewhere might have come up with that was dismissed at the informed expert stage but became woven into popular wisdom. Maybe the 470kHz emergency transmission thing was one of those convoluted three'n'fourpence off-shoots?
A not very intensive bout of searching pitches up various references to "Operation Rafter"- many of them appear somewhat garbled and tenuous as to technical detail and understanding, but some light winnowing and averaging of detail suggests that it may have involved a combination of monitoring IF radiation (this would betray the modulation) and transmitting a swept, wideband "squawk" (this would betray the frequency being received by the target as it swept through the radiated IF). Of course, this all derives from the single-source of the Peter Wright "Spycatcher" book and may actually have been deliberately misleading, a classic gotcha of intelligence revelations.
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