Journal ArticleDOI
TH-3 microwave Radio system: Modulators
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TLDR
In this paper, the required frequency downconversion, upconversion and shift are performed by three similar solid state modulators, and the choice of an unbalanced design resulted in a simple modulator microwave structure which can be easily tuned and uniformly reproduced.Abstract:
In a TH-3 repeater the required frequency downconversion, upconversion, and shift is performed by three similar solid state modulators. The choice of an unbalanced design resulted in a simple modulator microwave structure which can be easily tuned and uniformly reproduced. The shift and transmitter modulators use a varactor diode for high pump efficiency while, in the receiver modulator, a Schottky diode is used to achieve a low noise figure and broadband operation.read more
Citations
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Journal ArticleDOI
TH-3 microwave Radio system: Microwave transmitter and receiver
A. Hamori,R. M. Jensen +1 more
TL;DR: In this article, the features and performance of a 6 GHz transmitter and receiver are described and the system objectives of 41 dBrnc0 for 4000 miles at 1800-circuit loading derived in the previous paper are applied to the design.
Journal ArticleDOI
TH-3 microwave Radio system: The IF main amplifier
TL;DR: The IF main amplifier is the output amplifier for the TH-3 microwave radio receiver as discussed by the authors, which provides a 3-to 49-dB gain range under control of an associated AGC circuit to compensate for radio signal fading.
Journal ArticleDOI
The AR6A Single-Sideband Microwave Radio System: Microwave carrier supply
J. Gonda,J. M. Kiker +1 more
TL;DR: In the AR6A repeater bay, microwave carrier power for both the receiver and the transmitter is derived from a single voltage-controlled crystal oscillator, phase locked to an external-reference frequency, available at each radio station.
Journal ArticleDOI
The AR6A Single-Sideband Microwave Radio System: Radio-line physical design
S. A. Harvey,P. D. Patel +1 more
TL;DR: Modularity is a new feature incorporated into the design of the transmitter and receiver radio bay, and a novel thermal design detail used with discrete transistors in the IF circuits to ensure their reliable operation is described.
Journal ArticleDOI
A broad-band parametric up-converter for S-band troposcatter communication systems
TL;DR: An upper sideband up-converter using a snap varactor diode capable of providing a useful signal gain is described, which can be used for any of the r.f. channels of the S-band communication system without retuning.
References
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Journal ArticleDOI
TH-3 microwave Radio system: System considerations
R. M. Jansen,R. C. Prime +1 more
TL;DR: In this paper, a general description of the TH-3 long-haul microwave radio system which operates in the 6 GHz common carrier band is given, and the allocation of noise to the various contributors is developed.
Journal ArticleDOI
TD-3 system: Schottky barrier receiver modulator
TL;DR: In this paper, the receiver modulator of the TD-3 repeater is described and the amplitude transmission characteristic of the modulator is flat to ± 0.01 dB for ± 6 MHz, and the average noise figure is 6.7 dB.
Journal ArticleDOI
TH-3 microwave Radio system: The IF main amplifier
TL;DR: The IF main amplifier is the output amplifier for the TH-3 microwave radio receiver as discussed by the authors, which provides a 3-to 49-dB gain range under control of an associated AGC circuit to compensate for radio signal fading.