| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a transmitting frequency measuring circuit which can prevent measure error of frequency due to expansion of gate period to measure accurately. SOLUTION: Frequency based on oscillation frequency of a crystal oscillator 1 to be a transmitting source is divided by a prescaler 4 and wave form of the divided oscillation output of the crystal oscillator 1 is formed by a wave form forming circuit 5. A GPS satellite signal is received by a GPS satellite signal receiver 6 and a count start pulse is transmitted from a decoder 7 to a gate signal generating circuit 8 based on time data in the received GPS satellite signal and a count terminating pulse is transmitted after 1 second from the count start pulse generating time and gate pulse from time the count start pulse is generated to time when the count terminate pulse is generated is produced in the gate signal generating circuit 8 and oscillation frequency of the crystal oscillator 1 is measured based on a calculated value that number of square wave pulse provided from the wave form forming circuit 5 is calculated in a transmitting frequency counter 9 while the gate pulse is generating.</p> |
