Atec IFRMLS800 User Manual

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Avionics

MLS-800 Microprocessor Controlled Ground Station Simulator

• Test Operational Menu supports ICAO
1985 and EUROCAE ED-53A and
ED-36A

• Complete Main Path Simulation:
Approach (AZ) and High Rate Azimuth
(HiAZ) Elevation (EL) Back Azimuth (BAZ)
Flare (FL)

• Complete Multi-path (MP) Simulation
Capability:
Interference Pulses
Selectable Fade Rate Modulation of 0.05,
1 and 1000 Hz

• Control of all Beam Parameters:
Angular Position Beam Amplitude
Referenced to the Preamble Norm and
Half Width Pulse Selectable Beam Width
at 0.5°, 1°, 2°, 3°, 4° or 5°

• Sync Capability for: External Monitoring
Designating PFE and CMN Function
Designating Multi-path Function

• Preamble Parity, Symmetry and Percent
Update

• Simulates all Basic Data Words plus
Auxiliary Data Words with Parity Selection

• Full Range of MLS Channels

Aeroflex is a leader in the design, manufacture
and marketing of Avionics test systems.

The MLS-800 is a microprocessor controlled Ground Station
Simulator designed to operate from a bench test environment. Test
parameters are selected via a 44-position keyboard and displayed on
test operational menus.

Other Features

• OCI Control for Right (RT), Left (LT) and Rear (RR)

• 75 dB AZ to EL Ratio Capability Propellor/Rotor Modulation at 1
to 100 Hz Variable in 1 Hz steps Morse Code Identification
Capability

• ARINC 429 Receiver with PFE and CMN calculations

• External RF Reference Input

• Clearance Pulse Simulation

• 6.75 Hz Modulation

• IEEE-488-1978 Interface for Remote Control Operation

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• Unless otherwise noted the following equipment performance char-

acteristics are warranted over the specified environmental conditions
following a 20 minute warm-up period.

• All RF measurements are referenced to 50 Ω.

• Accuracy and resolution stated in percent are referenced to measured

or desired values.

• Where resolution exceeds accuracy, resolution takes precedence.

• Notes are intended to provide information useful in applying the

instrument by giving specific setup information. Notes are found in
the notes section of this specification.

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FREQUENCY

Frequency Range

5031.0 to 5090.7 MHz

Steps

0.3 MHz

Accuracy

±1.0 kHz

OUTPUT POWER

Level Range

-17 to -122 dBm

Level Accuracy

±2.0 dB

Level Flatness

±0.5 dB at -20 dBm (Note 1 and 2)

Attenuator Accuracy

±1.0 dB

Attenuator Monotonicity

±0.5 to 1.5 dB (Each Step)

Spectral Purity

Noise Floor

Offset ± 0.3 to 1.2 MHz from Cf

-105 dBc/Hz (Note 3 and 4)

Residual FM Modulation

<1 kHz peak, 0.01 to 15 kHz BW

Residual Phase Modulation

<0.5 radians peak, 0.3 to 15 kHz BW

Spurious Signal Rejection (in-band)

From ±0.3 to 1.2 MHz

45 dBc

From ±1.2 to 30 MHz (band end)

65 dBc

Spurious Signal Rejection (out of band)

From 5120 to 5250 MHz

50 dBm

From 50 kHz to 12.4 GHz (excluding 5000 to 5250 MHz)

35 dBm

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MAIN PATH FUNCTIONS

BEAM ANGLES

Azimuth

±62°

High Rate Azimuth

±42°

Elevation

-1.5° to 29.5°

Flare

-2° to 10°

Back Azimuth

±42°

Angle Resolution

±0.05° steps

Angle Accuracy

±0.005°

Basic Data

All functions selectable on menu with selectable data values and parity

Auxiliary Data

All auxiliary data words selectable

BEAM SHAPE

Approximately sinx/x or 1/2 sinx/x waveforms at 1/2 width that fills time
slot. Sidelobes for 1/2 sinx/x are present on pulse side only.

BEAM WIDTH

Selectable to 0.5°, 1°, 2°, 3°, 4°, 5°

Accuracy

±10% of setting

Beam Level

Adjustable relative to preamble

Range

-3.0 to +13.0 dB (Note 6)

Resolution

1.0 dB steps

Accuracy

±1.0 dB

Side Lobes

Relative to beam level

Level

-20.0 dB, ±1.0 dB

OCI Pulses (Right, Left, Rear)

Width

100 ms, ±10 ms

Level

Adjustable relative to preamble

Range

-4.0 to +7.0 dB

RESOLUTION

1.0 dB steps

ACCURACY

±1.0 dB

DPSK MODULATION

Phase Shift

Logic Zero (0)

No transition

Logic One (1)

180°, ±10°

Amplitude Balance

±0.4 dB

TRANSITION TIME

<10

µ

s, 10% to 90%

MULTI-PATH FUNCTION

ANGLE

Selectable to maximum angle for selected function

ANGLE RESOLUTION

0.05° steps

ANGLE ACCURACY

±0.05°

BEAM SHAPE

Approximately sinx/x or 1/2 sinx/x waveforms at 1/2 width that fills time
slot. Sidelobes for 1/2 sinx/x are present on pulse side only.

BEAM WIDTH

Selectable to 0.5°, 1°, 2°, 3°, 4°, 5°