On 3/6/2014 10:36 AM, Mr. Luddite wrote:

Believe it or not one of the most effective types of jammers is also the
oldest and first type of RF transmitter used. It's called a spark-gap
transmitter and it generates RF interference across a very broad range
of frequencies simultaneously. The operation of a spark-gap transmitter
is illegal now-a-days for exactly that reason but are simple to make and
can be of more than enough power to temporarily wipe out communications
to virtually any radio controlled device.


And some things you really don't want to interfere with that will draw
attention. Controlled bandwidth jammers are pretty easy to make and way
less obnoxious.