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140-MHz IF Main Amplifiers for 2700-Channel Microwave Repeaters

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2 Author(s)
Watanabe, T. ; Nippon Telegraph and Telephone, Tokyo, Japan ; Kurokawa, T.

A gain controlled amplifier capable of transmitting 2700 channels is presented. In the 2700-channel radio relay system, the intermediate frequency (IF) was selected at 140 MHz. An IF main amplifier was required to handle approximately +14 dBm and to realize low distortion-gain control circuits. Conventional variolossers using semiconductor devices induce many harmonics and amplitude modulation-phase modulation (AM-PM) conversion, which relate to transmission distortion. This paper describes design objectives, a technique to reduce the aforementioned defects, and measured characteristics of the amplifier. Field tests of microwave repeaters using these amplifiers proved their utility.

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Communication Technology, IEEE Transactions on  (Volume:18 ,  Issue: 5 )