Hi, thanks for the reply.
I want to make a small device that can be located. e.g. pulse a RF module and use a directional ariel to find it.
I have been told the 2miles urban and 10 miles open, can be done without a licence on 433mhz, also I would like to be able to select a freq from a range of frequency's withing a set range.
Can this be done? is these such a device / module?
almost forgot also it must be 3.5v as it's battary operated (plenty of current just not much volt's)