Play along with NSA: The RAFTER unintentional radio emissions how-to

Then again, direct sampling SDR don&#x27;t have an LO to leak, but do have a stable clock. There are some power supplies and digital systems with spread spectrum clocks. No reason one could not use a spread spectrum ADC clock, heavily over sampled of course, then average the samples where needed. There are some ADC they randomize the data bus for EMC.<p>Do they still have vans in the UK that driving around looking for un-taxed TV?

It is a very interesting topic because almost all electronics devices have similar emissions , see <a href="http:&#x2F;&#x2F;www.cvel.clemson.edu&#x2F;pdf&#x2F;ED_Detection_2008.pdf" rel="nofollow">http:&#x2F;&#x2F;www.cvel.clemson.edu&#x2F;pdf&#x2F;ED_Detection_2008.pdf</a><p>Someday thieves will use these techniques to locate who in a dark alley has the latest iPhone.

This cat-and-mouse game has been going on for a long time, even outside of spycraft.<p>E.g. radar detectors are illegal in several states, so of course there have been devices sold to law enforcement to allow them to detect these illegal radar detectors. <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Radar_detector_detector" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Radar_detector_detector</a><p>That&#x27;s all probably moot now. I think law enforcement has moved mostly to using lasers, which are much more difficult to detect.

That Spycatcher book sounds interesting but looks intimidating. Can someone comment on its style and for-leisure readability?