When the DF65 is about 50 metres approx distance away from the TX8 transmitter I start to get warning signals and the screen reads about 25 for Range. I am not a radio buff but I would like to sail my DF 65 effectivelv and also stop annoying fellow sailors. The boat, TX and matching RX are about 2 years old and the Li battery is charged up. Any help will be much appreciated (particularly if written in simplest possible language).