| 摘要 |
PURPOSE:To prevent invasion of harmonic waves onto a main signal system and to allow the detection of a restorer rising level to hardly encounter a limit by providing a high frequency switch opening the main signal system to the transmission panel at the restorer transmission. CONSTITUTION:A high frequency switch 6 in a transmission panel 1 having a restorer function section 5 opens and interrupts a main signal system of an IF input signal branched by a branch section 2 at the restorer transmission from a restorer oscillator 4. Through the constitution above, an analog service line is available even when the restorer is arisen and a harmonic is not invaded onto the main signal system even when an IF input level to the transmission panel 1 is high. Furthermore, a limit in the detection of the restorer rising level by the IF input signal onto the transmission panel 1 is hardly caused. |
