the problem is a 'blocker' is like flooding or over powering. You would have to flood a spectrum of frequencies, and that's if the terrorists didn't use some other spectrum to communicate on.
You know when drive from one radio zone to the next and you stay on say 98.5 but the station starts picking up different music? If the new station increased their power teh 'take over' would be sooner. It would jam/block the other station sooner. So instead of you needing to be within 20 miles maybe now it would reach you 30 miles out.
The other type 'removal' of the unwanted would be akin to your graphic EQ. Pull down all the sliders but one. Of pull only one slider down. Either way you target a small spectrum but you need control over the receiver, which you won't have.
Those buildings you hear about that jam everything around them are also most likely a giant Faraday cage so all the power is going out to the perimeter and not back inside.
So it is kind of easy but it's not practical. That's why jamming devices are illegal to use. It's easy and it screws up everyone in the vicinity.
The notching stuff like the EQ, HAM guys do all day long, but they do it to their own radios so they can only hear what they want at any given time. Cable companies used to notch out premium content. the problem is you need to own all the gear to do that precision.
Bookmarks