Patent ID: 7522688

Claim:
A wireless clock system comprising: a master time source including means for wirelessly transmitting time signals containing time data; and a plurality of slave clocks, each of the slave clocks including means for wirelessly receiving time signals which cause the slave clock to operate in synchronization with a source of the received time signals, the source of the received time signals for at least one of the slave clocks being the master time source and the source for each other one of the slave clocks being the master time source or another one of the slave clocks, and each of the slave clocks further including means for wirelessly transmitting time signals containing time data whereby the transmissions by the slave clocks are controllable to minimize or prevent signal conflict, wherein the second time signals are transmitted by the wireless transmission means in the slave clocks in a frequency hopping manner, and wherein the frequency hopping is performed in a doubly pseudorandom manner, the second time signals being transmitted pseudo randomly from among preselected radio transmission freguencies within a preselected range and at pseudo-randomly selected transmission start times within a preselected range, so as to minimize signal conflicts at the slave clocks.