Apparatus and method for testing the condition of an antenna mon

Details Apparatus and method for testing the condition of an antenna mon Apparatus and method for testing the condition of an antenna mon

1973-06-05

1976-06-01

Griffin, Robert L.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325363, 343703, H04B 1700

Patent

active

039612600

ABSTRACT:
A method and apparatus for testing the condition of an antenna monitoring system are provided whereby a sampling loop and coaxial cable assembly may be provided for each antenna element and wherein each such assembly is normally terminated with a first impedance. The magnitude of current flowing through the normally terminated assembly or monitoring system is measured at a time when the antenna system and the monitoring system are known to be operating in a desired condition. An additional impedance is then placed in circuit with the first impedance and the new magnitude or offset value of current flowing through the assembly is measured. If the ratio or the difference between the normally terminated value of current and the offset value of current changes from the originally established base value, there is a strong liklihood that there is an abnormality in the sampling loop and cable assembly and probably not in the antenna system itself. Thus, a premature conclusion that the abnormality is in the antenna system is avoided when, in fact, the abnormality is in the monitoring system.

REFERENCES:
patent: 2196590 (1940-04-01), Koch
patent: 2995704 (1961-08-01), Norgaard
patent: 3130368 (1964-04-01), Hoover
patent: 3182262 (1965-05-01), Schumann
patent: 3296533 (1967-01-01), Karpinsky
patent: 3427614 (1969-02-01), Vinding
patent: 3548310 (1970-12-01), Fenwick
patent: 3718931 (1973-02-01), Collins

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