Re: RF Link?
Hi,
well, RF link can mean a lot of things. You have to specify the frequency of operation. It is determined with regulations and international standards. For 10km range you can work on arround 2.5 GHz, 13GHz, 18 GHz, 24, GHz etc. There might be some more bands, I am not quite sure. The construction and thus the circuits you will be required to use are determined by the choice of the working frequencies. One of the choices you have to make is also the type of antenna, etc. These are tipically duplex links (you din't specify do you need it as duplex), so a duplexer is needed to separete Tx from Rx ...
It is quite of a story!
flyhigh