| 摘要 |
PURPOSE:To prevent an output at the time of switching from varying by making in-use/stand-by alternations by applying the earth potential, etc., to an AGC path at an unused equipment side by supplying power to both in-use and stand-by equipments of a communication unit equipped with an AGC function. CONSTITUTION:An reception input from receiving antenna 1 is inputted to relay broadcast equipment 3 or 5 at a side of equipment number one or two through distributor 2 and then supplied to power amplifier 8 by way of output switch 7, and it is power-amplified and sent out by way of transmitting antenna 9. For switching operation, output switch 7 is changed over to the side of number-one equipment 3 and while relay broadcast unit 3 at an in-use side is connected to AGC unit 4 via change-over switch 14, unused equipment side 5 is grounded via change-over switch 15. Although number-one equipment 3 is operating normally and number-two equipment 5 is OFF, power supplies 12 and 13 are connected to both equipments 3 and 5 at any time, so that troubles caused when power supplies turned OFF at the time of switching can be prevented. |
