Technical Summary for DMA-37B DME Interrogator by Sfusaro

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									                    Aerospace Electronic Systems




                    TECHNICAL SUMMARY

                                OF

         DMA-37B DME Interrogator




Date:   June 2004
                                        Honeywell Proprietary Information


                                          TABLE OF CONTENTS

1. PRODUCT OVERVIEW .......................................................................................3

2. KEY FEATURES..................................................................................................4

3. RELIABILITY .......................................................................................................5

4. WARRANTY ........................................................................................................5

5. TECHNICAL CHARACTERISTICS .....................................................................6




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                             Honeywell Proprietary Information


1. PRODUCT OVERVIEW
The DMA-37B DME Interrogator, designed and manufactured by Honeywell’s
Aerospace Electronics Systems, is part of the Quantum Line of communications
and navigation equipment. The DMA-37B provides the flight crew with accurate
slant-range distance information in digital format, as measured from the aircraft to a
selected ground-based station.

The DMA-37B DME Interrogator is a very powerful scanning DME. In addition to
stations selected by the flight crew, it automatically searches for up to five stations
within a 300-nautical mile range. The DMA-37B provides fast scan and digital Morse
Code decoding outputs, fault memory, and built-in test equipment (BITE) interfaces
for use in a Central Maintenance Computer (CMC) or in a Centralized Fault Display
System (CFDS) per ARINC 604 and Airbus Industrie ABD-0048.

Honeywell’s DMA-37B DME Interrogator was designed to the following standards
and specifications:

•   ARINC 709 “Airborne Distance Measuring Equipment”
•   RTCA DO-189 “Minimum Operational Performance Standards (MOPS) for
    Airborne Distance Measuring Equipment (DME)”
•   EUROCAE ED-54 “Minimum Operational Performance Requirements for
    Distance Measuring Equipment Interrogator”

The DMA-37B DME Interrogator requires an L-Band, vertically polarized antenna for
RF inputs and outputs, a control head or flight management system for tuning, and
an audio output sink for Morse Code functions.




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                              Honeywell Proprietary Information


KEY FEATURES
The key features of the DMA-37B DME Interrogator are listed in the following table:

                              DMA-37B Key Features
                    TX: 1025.00 MHz to 1150.00 MHz
                    RX: 962.00 MHz to 1213.00 MHz
                    5 channel scanning capability (+1 background)
                    Sensitivity: -90 dBm minimum lock-on level
                    Output Power: 700 Watts (typical)
                    Range: 0 to 300 Nautical Miles
                    Velocity: 0 to 1000 Knots
                    4 MCU form factor (ARINC 600)
                    ARINC 429 Tuning Interface
                    CMC/CFDS Maintenance System Interface
                    200 millisecond Power Interrupt transparency
                    DO-160C Environmental Test compliant
                    High Intensity Radiated Fields (HIRF) protection
                    Lightning protection
                    180 minute ETOPS cooling
                    Front Panel LCD Display
                    PCMCIA “Flash Memory” Interface
                    RS-232 PC maintenance port

What uniquely distinguishes the DMA-37B from similar products is the LCD (Liquid
Crystal Display) located on the front panel. This provides part number, software
version, and detailed troubleshooting and maintenance information in plain English.
Self-test is initiated and detailed troubleshooting can be performed by simply
pushing one of two buttons located on the front panel. Maintenance personnel can
review the status of discrete inputs to the unit, verify tuning words, and review fault
history (up to 64 flight legs are stored in non-volatile memory). Again, all at the push
of a button.

Software loading is also simplified by use of the built-in PCMCIA card interface, also
located on the front panel. The software loads in a fraction of the time, and only a
single flash memory card is needed versus a handful of floppy disks.




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                            Honeywell Proprietary Information

2. RELIABILITY
As part of the Honeywell radios, the DMA-37B DME Interrogator was designed with
the following goals concerning reliability versus older ARINC 709 equipment:

      •   Reduce parts count by 25%
      •   Reduce interconnections by 33%
      •   Increase MTBF (Mean Time Between Failures) by 50%

Using an integrated product design team, consisting of representatives from all
departments including engineering, materials, manufacturing, test, product support
and marketing, tall goals were not only met but also exceeded. The DMA-37B has
30% fewer parts than previous designs. Higher level of component integration
resulted in only five modules in the DMA-37B, versus eleven modules in older
designs. Fewer modules mean fewer interconnections, eliminating motherboards
and extra ribbon cables.

The DMA-37B was subjected to HALT (highly accelerated life testing), during which
the radio was tested at temperatures well beyond normal operating extremes and
also tested to vibration levels beyond those specified in RTCA DO-160C. Why? To
evaluate the robustness of the design and determine areas for improvement. In
production, each DMA-37B is subjected to HASS (highly accelerated stress
screening) testing. The levels are slightly lower than those established during HALT
testing to avoid damaging the radio, but still high enough to ensure solder defects,
component defects, and process problems are found and subsequently eliminated.

So what does this mean to the end user? Fewer parts and reduced interconnections
mean there is less likelihood of component failures in the unit. HALT testing proves
the DMA-37B can withstand extremes beyond those seen in normal operation.
HASS testing in accordance with ISO 9001 procedures ensures a high quality, high
reliability product. Which means the DMA-37B will stay on the aircraft for a longer
period of time. In fact, the warranted MTBF for the radio is 40,000 hours. Data
collected from airlines indicates the DMA-37B exceeds this goal.

3. WARRANTY
To back up the warranted MTBF of 40,000 hours, the DMA-37B comes with a five
(5) year warranty as standard. Which means the radio is “fit and forget”. Should
repairs be necessary, the simple modular approach ensures rapid turn-around repair
times.




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                                     Honeywell Proprietary Information


     4. TECHNICAL CHARACTERISTICS

      CHARACTERISTIC                                            DESCRIPTION

General

   Form Factor                     4 MCU (ARINC 600)

   Weight                          9.2 lbs. (4,5 kg)

   Power Requirements              115 Vac. 380 to 420 Hz, 22 Watts

   Frequency Control               ARINC 429 MARK 33 (Serial Digital)

   Cooling                         Forced Air per ARINC Specification 600

   Range                           0 to 300 Nautical Miles

   Altitude                        50,000 feet above mean sea level

   Velocity                        0 to 1000 Knots

   Certification                   TSO C66c; DO-160C Environmental Categories
                                   /A2D2/ZCA/MNB/XXXXXXAEAEZUZ/XXE2/XX
                                   DO-178B, DO-189, EUROCAE ED-54

Transmitter

   Frequency Range                 1025.00 to 1150.00 MHz, 1 MHz channel spacing

   Frequency Stability             ±80 kHz

   Output Power                    700 Watts (typical)

   Pulse Code Spacing
     X-Channel                     12.0 ± 0.4 microseconds
     Y-Channel                     36.0 ± 0.4 microseconds

   Frequency Spectrum              90% of total pulse energy within ± 0.25 MHz of channel frequency

   Rise Time (maximum)             2.8 microseconds (consistent with pulse spectrum)

   CW leakage at Antenna           -79 dBm maximum
   Connector

   Antenna Mismatch                No damage to transmitter with antenna open or short circuit

                           Table 5-1: DMA-37B Technical Characteristics




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                                   Honeywell Proprietary Information



    CHARACTERISTIC                                           DESCRIPTION

Receiver

   Frequency                   962.00 MHz to 1213.00 MHz, 1 MHz channel spacing

   Sensitivity                 -90 dBm minimum lock-on level

   Selectivity                 less than 6dB attenuation at ± 85 kHz bandwidth
                               more than 50dB attenuation at ± 800 kHz bandwidth

   Dynamic Range               80 dB minimum

   Image Rejection             60 dB minimum

   CW Rejection                60 dB minimum

   Audio Output                40 milliwatts minimum, into a 200-ohm to 10,000 ohm resistive load with –
                               87 dBm input signal level

   Harmonic Distortion         Less than 15% with 1000 microvolt input signal modulated 30% at 1000 Hz,
                               and less than 20% with 90% modulation for rated audio output into a 200-
                               ohm to 600-ohm resistive load

   Audio Output Regulation     Less than 6 dB voltage change from a 25-milliwat reference level into 200
                               ohms, for resistive load variations between 200 ohms to 10,000 ohms;
                               Less than 0.31-dB voltage change from a 40-milliwatt level into 600-ohm
                               reference, for resistive load variations between 453 ohms and 2400 ohms

   Audio Noise Level           Greater than 30 dB below audio reference level

   Digital Range Output        Distance available in fractional binary format and BCD format in accordance
                               with ARINC 709 and ARINC 429 standards

   Warning Signals             Digital warning signals provided in accordance with ARINC 709 and
                               ARINC 429 standards

   Distance Accuracy           0.2 Nautical Miles for lock-on signal levels to –80 dBm
                               0.1 Nautical Miles for lock-on signal levels from –80 dBm to –10 dBm

                     Table 5-2: DMA-37B Technical Characteristics, contd.




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