Patent ID: 7103086

Claim:
In a frequency hopping radio communication system, a method of transmitting and receiving data, said method comprising the steps of: at a transmission location, preparing at least one data packet, each data packet being encoded using Manchester Differential encoding, each data packet having a header containing a repeating pulse pattern appended to transmission data; and selecting one of a plurality of channels within a frequency range for each data packet; transmitting each data packet as a frequency-modulated signal on its selected channel; and at a receiving location, scanning all channels within said frequency range and at least partially demodulating any received signal and passing the demodulated signal through a low-pass filter and a comparator in order to both determine on which of said channels a particular data packet is being transmitted, and validate at least one pulse pattern by ascertaining that each pulse of the pattern has a width within an acceptable range before the transmission data within that data packet is received.