| 摘要 |
A radio communication device (10) has a controller (11), an antenna mount (12), a reference voltage source (13), a voltage bias supply (14), transceiver circuitry (15) and an annunciator (16). Device (10) also has an antenna (17) that is detachably mounted to antenna mount (12). The base of antenna (17) has a conductive track (19) which is selectively insulated. Uninsulated portions of conductive track (19) connects electrical contacts on antenna mount (12) such that a code signal can be provided on signal lines connecting antenna mount (12) to controller (11). The electrical contacts are distributed on a contact housing (30) of antenna mount (12). In response to the code signal, controller (11) controls annunciator (16) to provide an indication to a user of device (10) whether antenna (17) is selected appropriately or improperly connected. The code signal is provided independent of radiofrequency signals received or transmitted via transceiver circuitry (15).
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