TESTING RESPONSE OF A RADIO TRANSCEIVER

A radio transceiver comprising: an antenna; a local oscillator for generatin g a local oscillator signal at a local oscillator frequency; a receiver capable of receiving a first radio frequency signal fr om the antenna at a receiver input and having a first mixer for mixing a signal derived from the first radio signal with the said local oscillator signal to generate an intermediate frequency signal, and a receiver output for providing an output signal dependant on th e intermediate frequency signal; a transmitter capable of receiving an input signal at a transmitter input and having a second mixer f or mixing a signal derived from the input signal with a local oscillator signal to generate a second radio frequency signal for transmission; a switching arrangement having a normal configuration in which the transmitter is coupled to the antenna to apply the second radio frequency signal to the antenna, and a testing configuration in which the transmitter is coupled to the receiver input to apply the second radio frequency signal to the receiver input; and a signal processor coupled to the transmitter input and the receiver output and capable of, when the switching arrangement is in the testing configuration, applying a testing signal to the transmitter inpu t to cause the transmitter to generatea radio frequency test signal, and determining from the output signal of the receiver the response of the receiver to the radio frequency test signal.