31. They are typically used for simple carrier recovery schemes or as the initial method of coarse carrier frequency recovery. 32. At the same time as AM radio began, carrier frequencies , called " frequency division multiplexing ". 33. Some stations, for instance Droitwich transmitting station in the UK, derive their carrier frequencies from an atomic clock. 34. The BVU 800 series Y-FM carrier frequency was upped to 1.2 MHz giving it wider bandwidth. 35. Carrier frequencies on the longwave band are assigned as integer multiples of nine kHz ranging from 153 to 279 kHz.36. A carrier frequency of at least ten times the desired output frequency is used to establish the PWM switching intervals. 37. Carrier frequency and phase recovery as well as demodulation can be accomplished using a Costas loop of the appropriate order.38. The other meaning of the term " channel " in telecommunications is seen in the phrase " carrier frequencies ". 39. Hence, "'carrier frequency offset "'always exists even if there is no Doppler effect. 40. This phenomenon can be overcome by shifting the location of the communicating nodes or by switching the communication carrier frequency .
