| 摘要 |
In the TRO(Transmit Reference Oscillator) for generating a reference frequency to transmit data about 500 MHz total bandwidth which is a bandwidth of a satellite communication relay, the apparatus comprises: a 15 dividing means 22 for dividing 5MHz reference signal locked from a hub station by 15, and outputting 333.3 KHz; a VCO(Voltage Controlled Oscillator) means 25 for inputting a filtered DC voltage, and outputting a transmit reference frequency; a 4 dividing means 26 for inputting the transmit reference frequency outputted from the VCO means 25, and dividing by 4; a CP(Control Processor) means 29 for outputting a divide rate control signal; a N dividing means 27 for outputting and dividing the 4 divided signal from the 4 dividing means 26 by N according to the divide rate control signal of the CP means 29; a phase detecting means 23 for comparing an output signal phase of the N dividing means 27 with an output signal phase of the 15 dividing means 22, and detecting its difference signal; a low pass filtering means 24 for filtering the phase difference signal detected from the phase detecting means 23, and outputting it into the VCO means 25; and an alarm generating means 28 for inputting the output signal of the 15 dividing means 22 and the output signal of the N dividing means 27, and generating an alarm signal according to a phase difference.
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