Patent ID: 6563883
Filing Date: 2003-05-13
Classification: H03F,H03G,H04B

Abstract:
A transmitter comprising:an input for receiving a signal; gain control means for applying a first gain to the received signal; first path means for providing a second, relatively high gain for said received signal; second path means for providing a third, relatively low gain for said received signal; transmitter means for transmitting a signal; and control means operable, in use, to cause a received signal to pass through the gain control means and said first path means when a relatively high gain is to be applied to the received signal and to cause a received signal to pass through the gain control means and said second path means when a relatively low gain is to be applied to said received signal, wherein when a change is made from using one of said first and second path means to using the other of said first and second path means, the power of the signal transmitted by the transmitter varies by less than or equal to a predetermined amount; and measuring means to provide a value indicative of the value of the power level of the signal transmitted by the transmitter means, said measuring means providing a reference value when a signal passes through said second path means and the gain of the gain control means has been set to a predetermined level, wherein the control means, when the measuring means provides the reference value when a signal passes through the first path means, causes a received signal to pass through said second path means.