Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-08-08
1982-06-22
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5SA, G01S 736
Patent
active
043365418
ABSTRACT:
An apparatus for use in conjunction with an instantaneous frequency measurement (IFM) receiver, for detecting the presence of two or more RF signals, differing in frequency, between the onset of the first RF signal pulse and the completion of the frequency encoding strobe. High frequency sample and hold circuits detect the level of the video upon stabilization of the leading edge of the first received pulse. Thereafter, comparators monitor both the video and sampled levels to detect defined differences therebetween. Monitoring ceases at the termination of the frequency encode strobe. Ambiguities in the encode frequency are detected by comparator unbalances, which actuate the inputs to a logic OR gate. The output of the OR gate is connected to a logic AND gate, whose other input changes in level upon the termination of the encode strobe. The output of the AND gate latches an alarm, signalling the IFM receiver that the frequency measurement is ambiguous.
REFERENCES:
patent: 4146892 (1979-03-01), Overman et al.
patent: 4188628 (1980-02-01), Langeraar et al.
patent: 4194206 (1980-03-01), Tsui et al.
patent: 4204165 (1980-05-01), Ready
Caschera Joseph
Shaw Rudy L.
Tsui James B. Y.
Salys Casimer K.
Singer Donald J.
The United States of America as represented by the Secretary of
Tubbesing T. H.
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