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Air Traffic Control and Navaids System

DMENAVAIDS SYSTEMS

Specifications

General Characteristics

Type DME/N
Output Power Nominal 1 kW peak
Distance Accuracy ± 75 m
Coverage More than 200 NM
Handling Capability 200 interrogators (searching: 10 and tracking: 190)
Channel Number 252 (X mode: 126 and Y mode: 126)
DC Input Power + 40 to + 56 VDC (battery nominal 48 V)
Power Consumption 250 VA (Normal operation)

Environmental Conditions

Ambient Temperature (Except COTS) - 10 to + 55℃ (Indoor Equipment)
Relative Humidity
(Except COTS)
Maximum 95 % RH (up to + 35℃)
Maximum 60 % RH (up to + 55℃)
(Indoor Equipment)

Transmitting Characteristics

Frequency Range 960 to 1,215 MHz
Frequency Stability ± 0.001 %
Channel Spacing 1 MHz
Pulse Shape Rise Time 1.5 to 3.0 μs
Decay Time 1.5 to 3.5 μs
Duration 3.5 ± 0.5 μs
Pulse Spectrum As per ICAO Annex 10
Pair Pulse Power Variation Less than 1 dB
Pair Pulse Spacing X mode: 12 ± 0.25 μs, Y mode: 30 ± 0.25 μs
Transmitting Rate 700 to 5,400 pps
Spurious More than 60 dBc
ON/OFF Isolation More than 80 dB

Receiving Characteristics

Sensitivity Less than - 91 dBm (at Receiver Efficiency 70 %)
Selectivity Rejection of adjacent channels More than 80 dB (at fc ± 900 kHz)
Rejection of Spurious and Image More than 75 dB (at 960 to 1,215 MHz)
Reply Delay X mode 50 μs ± 0.5 μs,
Y mode 56 μs ± 0.5 μs
(1st pulse timing operation)
Echo Suppression Period 0 to 400 μs, Adjustable
Echo Suppression level 0 to 60 dB, Adjustable

Monitor System Characteristics

Reply Delay ± 1 μs, Adjustable (Tolerance ± 0.1 μs)
Reply Efficiency 55 to 70 %
Reply Pulse Power - 3 to - 5 dB, Adjustable (Tolerance ± 0.5 dB)
Transmission Rate More than 5,400 pps or Less than 700 pps
Pulse Pair Spacing ± 1 μs, Adjustable (Tolerance ± 0.1 μs)
ID Code group length More than 9 seconds
No ID period More than 45 seconds
Automatic self-check item System delay, Pulse spacing, Sensitivity,
Output Power,Transmission rate
Manual self-check item Automatic self-check item and ID check

Applicable Standards

  • ICAO Annex 10
  • EUROCAE ED-57
  • ISO 9001
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