> It would seem especially far fetched in light of the number of
> amateur radio (HAM) operators who could pinpoint the location of the
> 'bogus' transmitter in a few hours (or less) and would probably enjoy
> doing it! The FCC could do the same job, of course! ;-) A
> transmitter strong enough to completely mask the real signal would
> show up like a search light at midnight to any reasonably competent
> triangulation team.
Let's say you have the aerial for your time receiver on the roof of
your 10 story office building. If I can get a transmitter within 3
meters of your aerial, then at ground level (30 meters away) the
signal strength will be 1/100 that required to beat the real time
signal --- this is likely to be getting towards the level of
background noise (i.e. becoming un-detectable). You could probably
make the transmitter the size of a cigarette packet (trailing a wire
as an aerial), and catapult it onto the roof.
Alternatively, a van in the car park, with a directional aerial pointed
up at the receiver would probably also be fairly un-detectable.
The details are a bit vague, but you can see what I'm getting at --- I
don't think that you can blithely assume that it is impossible to do