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Abstract
In quadruple diversity troposcatter system, one transmitter and two receivers are connected to each antenna, utilizing dual-polarized feed horns. In the receiver arm, a diplexer including a 3- or 4-port circulator and multlcavity preselectors are provided ahead of the front-end amplifiers. The diplexer introduces 2 to 2.5 dB of insertion loss and the noise figure of the receiver gets degraded by this amount. A modified configuration of the front-end of the receivers has been evolved and tried out. The modified configuration eliminates the noise figure degradation of 2 to 2.5 dB and also utilizes one front-end amplifier for two receivers. A few other advantages also could be realized with this modification. This paper describes the existing arrangement, the modified arrangement and the performance results.
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P. Govindarajan
GOVINDARAJAN, P: Graduated from College of Engineering, Guindy, (Madras) in 19560 with BE (Hons) in Telecommunication. Joined the Air Force in 1957 in the Technical Signals Branch and has served in operational and maintenance units of the Air Force dealing with airborne and ground radar, navigational and communication equipment. He obtained Master of Engineering degree in advanced electronics with distinction from Indian Institute of Science, Bangalore in 1970. Since 1973, he is working as a Project Engineer, in Systems Techniques Development in the Radar & Communication Project Office of the Ministry of Defence.