Self test avionics equipment
US4970510A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1989 |
| Grant date | Nov 13, 1990 |
| Priority date | — |
| Expiry date | Dec 20, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G5/80
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.