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Digital RMI/DME indicators (United States), FLIGHT/MISSION MANAGEMENT (FM/MM) AND DISPLAY SYSTEMS

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Title
Digital RMI/DME indicators (United States)

Section
FLIGHT/MISSION MANAGEMENT (FM/MM) AND DISPLAY SYSTEMS

Appearing in
Jane's Avionics

Publication date
Jan 24, 2007

Type
Flight instrumentation.

Description
Designed to interface with both the current ARINC 700 sensors and the older-generation analogue avionics, this new series of combined Radio Magnetic Indicators and Distance Measuring Equipment (RMI/DME) forms a family of instruments that share many common features including electrical, servo, thermal, packaging and lighting methods. Use of a patent digital encoder/driver module, common to each instrument and each channel within it, permits packaging techniques which greatly improve the effectiveness of the heat transfer arrangements. The encoder/driver module consists of an 11-bit digital encoder, DC motor and associated drive circuits, all under microprocessor control. Each of the six channels is isolated from its neighbour for integrity and each has its own single chip microcomputer. Each channel monitors its own faults and activates its own flag or shutter and output signal. The members of the digital RMI/DME instrument family comprise:RMI-733A radio magnetic indicator: a compact lightweight VOR/ADF selectable three-servo instrument. A version designated RMI-733A is a three-servo instrument designed to display information from an ADF receiver.RDMI-743 radio distance magnetic indicator: this instrument features liquid crystal DME readouts for better reliability and readability. The three-servo unit is selectable to either VOR/ADF or VOR only.RDMI-743A radio distance magnetic indicator: with a magnetic wheel DME display, the RDMI-743A is a four-servo VOR instrument.

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