Communications: electrical – Aircraft alarm or indicating systems
Patent
1989-12-20
1990-11-13
Orsino, Joseph A.
Communications: electrical
Aircraft alarm or indicating systems
340514, 36442403, 455 67, G06F 1520
Patent
active
049705105
ABSTRACT:
A self test avionics equipment is provided for use on an aircraft as part of a traffic collision avoidance system. The equipment has a radio frequency (RF) section and an integral test system. The RF section has an input/output unit, a transmitter and a receiver. The input/output unit has a local oscillator with a directional coupler, a two-way divider connected to the coupler, and an attenuator connected through a modulator to the coupler. The mixer and two-way divider each have an output coupling connector. The attenuator has an output pin switch connector. The transmitter has a modulator/amplifier portion, a spectrum filter connected to the modulator/amplifier portion, and a harmonic filter connected to the spectral filter. The harmonic filter has an ouput coupling connector. The test system comprises three dirctional coupler circuits and a pin switch circuit. The three directional coupler circuits are respectively coupled to the three output coupling connectors, respectively from the mixer, the two-way divider and the harmonic filter. A pin switch circuit connects to the pin switch connector.
REFERENCES:
patent: 4155116 (1979-05-01), Tawfik et al.
patent: 4245352 (1981-01-01), Karpowycz et al.
patent: 4361904 (1982-11-01), Matsumura
patent: 4788531 (1988-11-01), Corwin et al.
Honeywell Inc.
Orsino Joseph A.
Swarthout Brent A.
Terry Howard Paul
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