Patent ID: 6529710
Filing Date: 2003-03-04
Classification: H03G,H04W

Abstract:
An automatic gain compensation circuit for a radio transmission and reception system comprising:a circuit coupled to receive a transmission signal generated by a radio system transmitter represenative of the of the radio system output power at the radio system antenna, said circuit generating an output power signal the frequency of which is correlated to the transmission signal output power, summing said generated output power signal and a radio frequency signal received by the radio system into a combined signal and transmitting said combined signal on the radio system receiver line; and a power control circuit coupled to receive said signal, said power control circuit generating a power control signal and transmitting said power control signal to the radio system high power amplifier; a radio system transmitter generating a L-band frequency signal; a radio system high power amplifier coupled to said transmitter by a first transmitter cable, said high power amplifier dynamically increasing and decreasing the power of said L-band radio frequency signal in response to said power control signal; said circuit coupled to receive a transmission signal generated by a radio system further comprises a diplexer coupled to said high power amplifier by a second transmit cable, said diplexer detecting the power level of said L-band radio frequency signal; a radio system radio frequency antenna coupled to said diplexer to receive said radio system generated L-band radio frequency signal and transmit a radio frequency transmission signal originating outside of the radio system and outputting said received radio frequency signal; a radio system low noise amplifier coupled to said antenna to receive said received radio frequency signal, said low noise amplifier amplifying said received radio frequency signal; a signal summer coupled to said diplexer to receive said output signal and coupled to said low noise amplifier to receive said received radio frequency signal, said signal summer summing said output power signal and said received radio frequency signal into a combined signal and outputting said combined signal; and said power control circuit further comprising; a) a signal splitter coupled to said low noise amplifier by a receiver cable to receive said combined signal, said signal splitter dividing said combined signal into said output power signal and said received radio frequency signal and outputting said signals; and a power control signal generator coupled to said signal splitter to receive said output power signal and generation a variable power control signal responsive to said output power signal, said power control signal generator coupled to transmit said variable power control signal to said high power amplifier.