| 摘要 |
PURPOSE: An isolation test device of a GPS mobile communication terminal is provided to remove a noise signal included in a call processing signal delivered from a base station device, and to transmit the signal to a GPS mobile communication terminal, thereby obtaining an exact test value. CONSTITUTION: A noise removing device(300) removes noise included in a call processing signal delivered from a base station device(200), and comprises as follows. A duplexer(310) consists of a BPF(Band Pass Filter) for passing a transmission frequency only and a BPF for passing a receiving frequency only, to separate the transmission frequency from the receiving frequency, and transmits the pure call processing signal only to a GPS mobile communication terminal(500). An RF filter(320) filters the filtered transmission frequency again, to remove all remaining noises. A combiner(330) applies the transmission frequency to a port where a frequency received from the terminal(500) is received, and sends the frequency received from the terminal(500) to the duplexer(310). |
