ALL FET FRONT-END FOR 12 GHz SATELLITE BROADCASTING RECEPTION+ Rene DESSERT*, Peter HARROP*, Bernard KRAMER*, and Theo VLEK** ABSTRACT A 12 GHz receiver front-end has been designed and realised which uses field-effect transistors for each of the three major functions of r.f. preamplifier, mixer and local oscillator. In each of these functions, the FET presents its particular advantage

STUDY OF THE LINEARITY FREQUENCY OF A TRANSISTORIZED RANGE POWER AMPLIFIER OPERATING IN THE 3.8 TO 4.2.GHz J. PREVOT ABSTRACT The theoretical and experimental ties of transistorized microwave study of the reduction of the non-lineariamplifiers is explained here. The retained solution consists in comparing the input signal with the main amplifier's output signal. The intermodulation produ

II GHz FET AMPLIFIER IN DIGITAL FOR MULTI CARRIER RECEPTION RADIO-RELAY APPLICATIONS X M. GOLOUBKOFF , J.P. CASTELLETTO x xx , A. LEC'LERT ABSTRACT This paper presents the design and performance of a FET amplifier in the 10.7 to 11.7 GHz bandwith. This amplifier was designed for multicarrier reception (4 channels) of a 8PSK 140 Mbit digital radio link to be placed just behind the antenna,

STUDY OF A TWO CARRIERS SOLID STATE STRAIGHT THROUGH REPEATER AT 7.5 GHz Denis ROUFFET, Alain RABIER, Bernard KRAMER* ABSTRACT A study of a 7.1 - 7.7 GHz repeater, designed to satisfy CCIR recommendations, and which avoids the necessity of any change in frequency is described. Two 300 channel carriers can be transmitted and it is therefore necessary that each amplifier should present the

VOICE UNDER DATA: A METHOD FOR TRANSMITTING TION OVER MICROWAVE COMMUNICATION HYBRID INFORMA LINKS - I. Frigyes * ABSTRACT In the Voice Under Data system relatively high capacity digital signals are transmitted together with relatively low capacity analog le.g. FDMI signals. In present digital mi - crowave links the system can be used e.g. for service channel transmission while in future

THE HYDRATION KINETICS STUDIED BY MEANS OF MICROWAVES F. HENRY, M. BRONCY, A.J. BERTEAUD * ABSTRACT The study of the binding state of water in organic or mineral compounds is important to understand the dehydration mechanisms in macromolecular films or the setting and hardening of cement pastes. A sensitive method for measuring microwave dielectric absorption of samples was used in order to

A NOVEL CURRENT B.A. Auld, MICROWAVE DETECTION G. Elston FERROMAGNETIC OF SURFACE and D.K. RESONANCE FLAWS . PROBE FOR EDDY IN METALS. Winslow ABSTP~CT : A new type of eddy current probe has been developed for detecting surface flaws in metals. By contrast with traditionel devices it operates at microwave frequencies and uses an yttrium iron garnet (YIG) ferromagnetic resonator. Such reso

vsb-RADAR A 35 GHz Doppler Radar For Velocity Distance And Acceleration Measurement8 On Railbound Vehicles. - Bertram Keller, Holger Meinel and Bernhard Rembold. Abstract: Certain problems associated with conventional vehicular speed sensing such as wheel slip or wheel lock can be avoided by employing a microwave sensing technique. A 35 GHz doppler-radar has been developed to measure velo

ANEW COLLISION AVOIDANCE SYSTEM USING BASEBAND REFLECTOMETRY G.F. Ross, H.M. Cronson and B. Rama Rao ABSTRACT This paper describes a guided wave, baseband radar-type sensor for protecting automated rapid transit vehicles traveling in dedicated guideways. The system has been given the acronym CASBAR for Collision Avoidance System using BAseband Reflectometry. A baseband pulse signal, 2

MICROWAVE THAWING OF LARGE PIECES OF BEEF A. PRIOU, C. FOURNET-FAY AS, A. DEFICIS and E~ GIMONET* ABSTRACT The main purpose of the study carried out since January 1976 is to define and realize an operational device allowing to study and optimize the thawing process of large pieces of beef by microwave energy.