Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1983-05-23
1985-05-28
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 177, G01R 1704, G01S 740
Patent
active
045203610
ABSTRACT:
In a system having plural signal-carrying channels, a phase shift is introduced between a signal in one of the channels and a reference signal for calibrating the individual channels. The phase shift is introduced by phase-shift apparatus responsive to a command signal directing the continuous monotonic increment of phase. The apparatus may be contained within each channel for use in the signal-carrying process, or may be placed in the reference channel for use solely in the calibration process. The phase incrementing introduces a frequency shift (a serrodyning) which produces a beat-frequency signal upon mixing a channel signal with a reference signal. The beat-frequency signal is phase locked to a modulation pattern of the command signal whereby a measurement of phase (or delay) can be made between the two signals for calibration of each channel within the system.
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patent: 4060806 (1977-11-01), Davies et al.
patent: 4176354 (1979-11-01), Hsiao et al.
patent: 4348676 (1982-09-01), Tom
patent: 4394659 (1983-07-01), Gellekink
Agovino F. R.
Barron Jr. Gilberto
Blum Theodore M.
Hazeltine Corporation
Onders E. A.
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