ALL FOR SOLID STATE 1800-CHANNEL RELAY TRANSMITTER-RECEIVER 6 - 8 GHZ RADIO SYSTEMS and K. Kinoshita N. Kusama, K. Sakamoto, T. Kyuzaki ABSTRACT This paper describes an all solid-state heterodyne transmitter-receiver in the 6 to 8 GHz band with a capacity of up to 1800 telephone channels. The equipment is fitted with an NEC-0.5 micron gate GaAs MESFET pre-RF amplifier having a noise figu

BROADBAND ADAPTIVELY-CONTROLLED POLARIZATION-SEPARATION NETWORK Anthony J. Gianatas}o * ABSTRACT A broadband adaptively-controlled frequency-reuse system has been developed and demonstrated. The system is designed to operate at 11 GHz and above, where polarization deorthogonalization due to rain effects is a problem. Direct analog control is used to continually correct for varying cross pol

A H~GH CAPACITY Pau1 R. Hartmann, DIGITAL Joseph TRANSMISSION A. Crossett, SYSTEM AT 11 GHZ and Eddie W. A11en* ABSTRACT The advent an attractive described solid-state performance with very high capacity digita1 microwave radio equipment is providing alternative for PCM transmission. A 90 Mb/s digital radio is here which uses 8 PSK modu1ation, low loss filtering, and modern design to achieve a

A COMPACT AND VERSATILE 19 GHz DIGITAL RADIO FIELD TRIAL EQUIPMENT L.J. Stagg and J.M. Robinson ABSTRACT A digital radio equipment operating at frequencies around 19 GHz is described. Designed for field trial applications it can be used in a variety of configurations, allowing trials of multichannel telecommunications systems and mobile or fixed, digitally encoded television outside broadcas

AN ADAPTATIVE PHASED ARRAY ANTENNA USING SIMPLE ALGORITHM J. ROGER, C. AUBRY, D RENAUD, F DEVAMBEZ * ABSTRACT This paper presents a simple and efficient method allowing the adaptation of electronically steerable antennas using quantized phase shifters. Adaptation aims to maximise the desired signal to external noise ratio. The process which does not involve the knowledge of the directions

CROSS FED PRINTED AERIALS * John. C. Williams. ABSTRACT The design of a simple printed planar array to replace horns in short range domestic radar and traffic control systems is described. The essential criterion is to keep the basic material and processing costs low, whilst retaining a necessary specified aerial performance. Cross-fed aerials use a novel diagonal fed array of microstrip radiati

DIRECTIVE MICROSTRIP ANTENNAS D.MarkopoulOS*, P.Catechi ABSTRACT Planar, directive, X band antennas were constructed with wide microstrips printed on phainolic paper substrates. Every microstrip functions as a cavity with loses due to radiation from the slots formed between their wide edjes and the earth plane. A number of approximations, mentioned below, form the theory of their opperation. A

VARIPHASE COUPLER Jeffrey T. Nemit ABSTRACT A new approach to the design and construction of phased array antennas has been developed which utilizes a device called a "Variphase Coupler". This device provides variable-phase coupling to a waveguide-type radiator from an integral waveguide feed, by means of diode-controlled waveguide slots. The principal advantage of this approach is that it comb

SATELLITE MENT COMMUNICATION SYSTEMS - STATE OF THE ART AND DEVELOP TRENDS - Telespazio - Rome, Italy By S. Tirro ABSTRACT In connection with the present development trends of the technology, and with the subsequent service rendering capability, the role of communication satellites in future is discussed. Three basic types of systems are considered: for Mobile communications for Point-to-

SELF-ADJUSTABLE MICROWAVE HOMODYNE CIRCUIT FOR ON-LINE SIMULTANEOUS ATTENUATION AND PHASE MEASUREMENTS Jerzy Kalinski Abstract: A chopped subcarrier method and a self-adjustable microwave homodyne circuit for simultaneous on-line attenuation and phase measurement under industrial conditions is presented. Substantial independence of measurement results on such metrological parameters of the circui