| 摘要 |
A wireless receiving subsystem operatively coupled to a broadcast receiver unit (12) having a frequency tuner has an antenna (14) with a feed point, an amplifier (20) located essentially at the feed point, and a transmission line (16, 40) extending from the feed point of the antenna and the amplifier to a signal input (10) of the broadcast receiver unit. The transmission line having a pair of conductors (24, 26), for example, coaxial conductors. A manually operated switch (28) is disposed in the transmission line for applying a DC voltage across the conductors, while a relay switch (22) is operatively coupled to the transmission line for changing a connection state of the amplifier to the transmission line in response to the voltage. |
