Certain radio frequencies have been allocated for radio telemetry purposes with restrictions on the type of data sent. For example at 458 MHz there is a band dedicated to telemetry, the transmit power is restricted to 500mW and therefore the range is limited to approx 20 kilometres.
For more information on the range of low power radio telemetry systems we have available please call us on +44 1827 310666 or email sales@PowTechnology.co.uk