Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-10-27
1980-09-30
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 171PW, G01S 740
Patent
active
042258669
ABSTRACT:
Apparatus is shown for controlling pulse width in pulsed, step-wise frequency modulated transmitters employing relatively long pulse widths and receiving pulse compression. Also disclosed is a pulsed pseudo-random coded radar system having fixed code word duration. Individual solid-state, RF power amplifier modules are paralleled, all spares included, and the full parallel group is operated at a power level such that individual units operate substantially below maximum power rating. RF solid-state device life is thereby increased. Failures of individual solid-state modules are recognized by a power monitor which operates to lengthen the pulse width in the FM staircase embodiment and to increase power supply input and, therefore, peak pulse power in the pseudo-random coded embodiment, thereby restoring average nominal transmitter power, notwithstanding one or more failed solid-state RF amplifiers.
REFERENCES:
patent: 3199107 (1965-08-01), Mills
patent: 3295130 (1966-12-01), Prestwood
patent: 3452353 (1969-06-01), Neuendorf
patent: 3795910 (1974-03-01), Robinson, Jr.
patent: 4066965 (1978-01-01), Schultz et al.
"A New-N-Way Power Divider/Combiner Suitable for High Power Applications" by Ulrik Gysel, IEEE-MTT-5 International Symposium Digest, pp. 116-118, 1975.
Hubler Malcolm F.
International Telephone and Telegraph Corporation
O'Neil William T.
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