The radio receiver includes a low noise amplifier that amplifies a received signal
to one of three different gain settings. One gain setting is maximum amplification,
a second gain setting is 6 dB below maximum amplification and a third gain setting
is 32 dB below maximum amplification. In the case of the third setting, the low
noise amplifier actually attenuates the received signal by 6 dB. The radio receiver
includes a pair of received signal strength indicators that provide received signal
strength indications to logic circuitry. Responsive to the received signal strength
indications, the logic circuitry generates control commands to the low noise amplifier
to prompt it to amplify at one of the three specified levels. Generally, if the
received signal has a gain level that exceeds a specified threshold, the low noise
amplifier actually attenuates the received signal; otherwise, the level of amplification
that is actually provided is a function of the presence of intermodulation interference.