Re “Faraday Caging” buildings:
Several years back, the subject of jammers was being kicked about on the local talk radio station. They had a caller who said he was a contractor who RF shielded buildings, and that it was both effective and legal. He also said that it probably wasn’t going to be a reasonable solution for a restaurant owner because it was expensive - most of his customers were medical clinics, who are very anal about RF around their equipment (probably with justification).
I would take on the order of 5 to 200 watts but that is a very wild ass guess. There are a lot of channels that can be used by cell phones so the transmitter would have to transmit at a fairly broad band of frequencies to guarantee disrupting service for all phones. This is a brief case sort of thing maybe a very heavy brief case if you need to run off grid for a while. As technology moves along it gets harder to jam cell phones because keeping phones from being jammed is a very similar problem to increasing the number of calls that be handled in one area.
Indeed, cops in my area are so dangerous they’ll hem your pants just for looking at them funny.
No.
Trunking can be likened to a telephone system. Think of it this way.
Picture a town with 1000 residents. Without a trunking telephone system, each resident would have his own dedicated trunk line to the system. So you would need 1000 trunk lines to the outside system to feed this non-trunking configuration.
Put a trunking system in place, and you can drop the number of trunk lines down to 15-20! That’s because not everyone is using their phone at the same time and we can conserve our outside line costs by switching each phone to an available outside line (or trunking it). If all lines are busy when John Somebody picks up his phone, he will not get a dial tone until someone releases a line, at which point John will be automatically trunked to the outside line.
Same with radio trunking systems. In the LTR system, you have up to 20 channels, each user is assigned a “home channel” and a “code”. When User A keys up to call his fleet, a signal is sent out on his home channel (a quick data burst) to the repeater, which sends back either A) a go-ahead to transmit or B) Switch to Channel # and transmit there. In either case, the entire fleet receives the signal and follows the repeater to the channel the base is transmitting on. This takes approximately 0.1 seconds, and is signified to the transmitting party by a “beep” tone after keying his microphone. If all channels are busy, the user receives a busy tone, and tries again.
So while a trunking radio does “frequency hop,” quite a bit of the time it is only transmitting on it’s “home channel.” It only frequency hops when that channel is busy.
Make sense?
Okay, so I’ve got my kickass “take that, cell phone talker 5000”. It’s in my briefcase. How big of a radius am I affecting with my massive batteries pumping out 200 watts of annoyance? Ten feet? A city block? Have I got 747’s falling from the sky?
-Joe
In which case, our heads will all be under water.
What have you got? Probably a coffin waiting for you.
At that frequency, that close to the antenna, and with 200 watts you’d probably be microwaved very nicely in a couple of minutes.
Right, but my point was that it doesn’t frequncy hop during a single transmission. Sorry if that wasn’t clear.
Well, I’ll obviously have my arm way out from my body!
-Joe
Actually ‘alteration’ is a slightly obscure word for castration
I wonder whether alteration would prevent re-offence - after all you can’t be castrated twice. Or is the idea a load of balls ?