To obtain the phase adjusting system of carrier wave without requiring re-adjustment.

A reference signal (a) is divided by a frequency dividing circuit 2 and inputted to an AC/DC converting circuit 4 via a delay circuit 3. An obtained DC voltage (d) is inputted to a variable carrier wave generating circuit 5 and the carrier wave signal (i) of an output is amplified by modulation and power with a broadcasting equipment 10 so as to be broadcasted with a broadcasting antenna 11. Radio wave from a GPS satellite 12 is received by an GPS antenna 6 and a GPS receiver 7. A reception signal (f) is frequency-divided by the frequency dividing circuit 8 so as to be an external synchronizing signal (g). Internal/external synchronizing signals (c) and (g) are compared in phase by a phase comparing circuit 9 and an output control signal (h) controls the delay quantity of the delay circuit 3 so as to permit the phases of the both synchronizing signals (c) and (g) to coincide. Therefore, the reference (synchronizing) signal (c) and carrier wave (i) are phase-synchronized with a signal from GPS 12.