Comment TETRA is now being used in the US, too (Score 1) 215
TETRA systems are now active in the USA: the FCC approved them under Part 90 two years ago, following trials in NJ and NY, among other places. http://urgentcomm.com/tetra/fc...
It is just going to be another digital option besides MOTOTRBO, P25, DMR, NEXEDGE etc. TETRA gear is cheap and proven so it should sell well, eventually. Pity a lot of it looks like old Nokia 5900 phones though.
Anyway, I question the value of such a detector device. Digital and analog two-way radio is used for so many things that have nothing to do with law enforcement, and/or law enforcement is using them for things other than coming after you, all in relatively close range. The thing is going to be going off constantly for no real reason.
For example, about 10 different law agencies cover my particular area and there's three different police stations within a few miles of me, not to mention fire, transit, and half a dozen other very active users. And that doesn't even include the private radio leasing companies which have their own trunk systems running EDACS. And then there are the stores using handhelds, hams, and who knows what else. Everybody is using two-way.
Basically merely knowing somebody is around using a two-way radio means nothing.