Chay said:
What is your application, how many units are you looking for, how soon do
you intend to acquire and what is your budget?
I want to build one small (handheld), battery-powered, mobile
phone jammer for personal use, so that when I'm on the bus/train
and some idiot starts loudly talking about his business, I can
cause just enough interference to disconnect him mysteriously.
I want very short range (no more than 5 meters) and it would be
nice if it had a little bit of directionality. I don't want to
aim it at someone but it would be nice to be able to disconnect
the loud phone user in front of me without affecting the text
messager behind me, for example.
Given the short range that I want, I think very low power would
be required, so it shouldn't be expensive and it should also
reduce the chances of getting caught. (I already know this is
technically illegal.)