| 摘要 |
A broadcast radio frequency amplifier for receiving and distributing broadcast radio frequency signals comprises: one or a plurality of signal inputs (319, 324); one or a plurality of signal outputs (301, 330 - 332); a forward path amplifier (305) for amplifying broadcast radio frequency signals received at said one or plurality of signal inputs, and supplying an amplified said broadcast radio frequency signal to said one or a plurality of signal outputs; a return path amplifier (306) for amplifying a control signal and supplying an amplified control signal to a said signal input; a power steering circuit (337) capable of feeding power applied to a said output to said forward path amplifier (305) in a first mode of operation, and said power steering circuit being capable of providing power to said forward path amplifier when power is applied to a said input, in a second mode of operation. The power steering circuit operates such that (i) power applied to a TV input is fed to the return path amplifier, whereas power applied to one or more outputs does not reach the return path amplifier, and (ii) power for infrared receivers is only provided to unpowered outputs if power is being applied to the TV signal input. |
