Patent ID: 7084808
Filing Date: 2006-08-01
Classification: H04B

Abstract:
1. An antenna system having at least two antennae and at least two receivers and having a self-test circuit comprising: a combination device to which all of said antennae are connected; said combination device being connected both to a first receiver and also connected to a second receiver, said combination device including combination circuit means for interconnecting one of said antennae as a first antenna to said first receiver and also for interconnecting one of the remaining antennae as a second antenna to said second receiver; a control unit connected to said combination device to direct that said combination circuit means interconnects said first antenna to transmit a test signal at a test frequency provided from said first receiver, and said control unit also is connected to said combination device to direct that said combination circuit means interconnects said second antenna to said second receiver that is tuned to the test frequency and said second receiver being connected to said control unit, said second receiver including a level measurement means for providing an actual level signal to said control unit said actual level signal is derived from a reception level signal received by said second antenna from said first antenna; and said control unit including a control unit circuit means for providing a self-test determination from comparison of the actual level signal with stored setpoint values.