| 摘要 |
PURPOSE:To simplify the circuit by receiving a transmission signal frequency after converting its frequency by a converter, inverting the frequency into the original signal, and mixing the frequency with the transmission frequency of the own station to convert the result into an intermediate frequency. CONSTITUTION:A converter 1 mixes a transmission signal frequency fA transmitted from a terminal device 4A with a local oscillator frequency F0 of the converter 1 to convert the frequency and a terminal device 4B receives the converted signal frequency FA and the frequency F0 via a coaxial cable and a branching filter. Further, the terminal device 4B mixes the frequencies FA, F0, inverts the mixed result into the original frequency fA, mixes the fA with the transmission signal frequency fZB of the own station and demodulates the converted result. Thus, the circuit is simplified because no local oscillator circuit is required separately. |
