sMRT Crewguard User Manual v1.1
MRT Ltd. © 2014
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Technical Data - sMRT Crewguard CG-121
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Control Box Dimensions
170x120x60mm Aluminium Box (excluding
antenna & connectors)
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Weight
1400gms
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Mounting Options Surface
200mm x 130mm (Opt 1)
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Bracket
198mm long x 60mm wide (Opt 2) weight 450gms
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Temperature range
-20°C + 60°C
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Waterproofing
IP68
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Sensitivity
0.5 uV at antenna input
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Frequencies
121.5 MHz, 121.65 MHz (Test 1), 121.775 (Test 2)
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Criteria of ELT/PLB recognition
Audible AM-modulated howling, downward
LF-range within 300Hz…1600Hz
LF-range 700 Hz minimum
Time of repetition: 250ms.500ms• DELTA lf/25MS:
-10Hz…-250Hz
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Audio exit
max. 8Vss (speaker > 8 Ohm)
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Relay contact
Floating, carrying capacity max. 0.5 A/10W
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Current Drain
Standby = 80mA /
If alarm + ext. speaker (8 Ohm) = 400mA
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Operating Voltage
12V DC (+ - 20%)
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Airband
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Fixed Antenna(optional)
Type: Fixed, Freq Range 120/300MHz. Impedence
Impedence: 50 Ω Gain:3.4dBi (120MHz), 5.5dBi
(300 MHz). VSWR: <1.5. Rated Wind Velocity:
60m/sec. Length: 1.7m. Max Dia: Approx 34cm.
Weight: 1kg. Type: 5/8 wave(120MHz) 2x5/8
wave(800MHz). Connector: M(M-J)
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Highgain Whip Antenna(optional)
Type: Dipole ½ with loaded radial. Freq
Range:118-137MHz. Impedence: 50 Ω
Radiation (HPlane):360° Omnidirectional. Gain:
2.15dbi.Max Power: 50Watts. Feed System: direct
/ Centre. Cable Length/Type: 5m, RG58 C/U.
Connector: FME-female. Length: 760mm. Weight:
330gr. Radial Length: 165mm. Mounting
Hole:14mm.
L Mounting Bracket: 98mm x 63mm
