Facility for monitoring the carrier-frequency and sideband signa

Details Facility for monitoring the carrier-frequency and sideband signa Facility for monitoring the carrier-frequency and sideband signa

1976-02-11

1977-01-25

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343100AP, G01S 144

Patent

active

040054276

ABSTRACT:
A facility for monitoring in the near field, the carrier-frequency and sideband signals radiated by a DVOR ground station is provided. In a first embodiment the monitor antenna is located outside the circle in the near field, and a controllable phase shifter compensates for the phase shifts caused by the different path lengths between the radiators of the circular array and the monitor antenna. In a second embodiment, the central radiator is used as the monitor antenna. The sideband signals received by this monitor antenna are modulated in a controllable phase shifter whose control is synchronized with the switching sequence of the commutator.

REFERENCES:
patent: 3818476 (1974-06-01), Coulter et al.

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