Name: Marlin Portable Monitoring Unit

Text: Marlin Portable Unit

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Marlin Portable Monitoring Unit
Overview
Marlin is a rapidly deployable system for the monitoring of calls made across the Inmarsat and
Thuraya satellite systems. The call intercept is invisible to both the user and the satellite
network.
Marlin enables traffic between the
mobile terminal and the satellite to
be monitored in a line of sight
operation, within radio range of the
target.
Control of the system is via an
intuitive windows based GUI.
Incoming calls are displayed in realtime, and voice is played via a laptop
computer, with each side of the call
played back on either channel of the
stereo output. Software to decode
and display a number of fax and data
protocols is included with the GUI.
Information relating to the identification of called and calling parties is recorded, along with the
geographical location (depending on service type and network).

Physical Description
The Marlin Portable Monitoring System comprises:
• Laptop
• Satellite and Target Antennae
• Marlin Portable Monitoring Unit
• Power Supply
These are supplied in travel cases for easy transport.
The monitoring unit itself is housed in a small desktop case (a rack mountable version is also
available).
It contains the following removable cards:
• 2 x Multi-channel Demodulator Cards
• 1 x Dual L-band Down Converter
Each card sits horizontally and plugs into the unit from the front, allowing easy replacement of
individual cards. A backplane provides power and signal distribution within the unit, along with
accommodating an Ethernet Switch and Frequency Reference.

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Key Features
Platform








Satellite to ground monitoring in line of sight
Intercept of up to 7 calls simultaneously
Small, portable form factor
Lightweight
L-band ‘Target’ and ‘Satellite’ inputs
Built in high stability reference
10/100BaseT Ethernet Control & Data Interface

Inmarsat





B (including HSD)
M
Mini-M
Gan (including HSD)

Thuraya
• Voice, Fax and Data
• Up to 3 spot-beams simultaneously monitored
• Up to TBC simultaneous calls

Technical Description
The Demodulator Card includes the following:
• Wideband High Speed ADC
• Digital Down-Converter
• Digital Signal Processor
• Ethernet Interface
The Demodulator Card accepts an instantaneous bandwidth of 34MHz, centered around
72MHz. The signal is filtered for image rejection, and then digitized by a high-speed analog-todigital converter. Frequency-tuning is performed by a digital down converter (DDC). The
resultant base-band signals are filtered by a programmable digital filter and DMA’d directly to
the DSP for demodulation. The demodulated data is output via the Ethernet Interface.
The Dual Down Converter Card takes L-band input from the Satellite and Target antennas, and
down-converts to the 72MHz required by the demodulator cards. Power is supplied to the
antenna LNAs via the same connection, allowing rapid deployment. It features variable
attenuation to accommodate the wide range of signal conditions experienced in the tactical
environment.
The backplane provides a 10 MHz reference and IF input signal to each of the Demodulator
Cards. The 10MHz frequency reference is derived from a temperature compensated crystal
oscillator with a stability of 1ppm.
The Ethernet Switch provides 4 10/100BaseT auto-negotiating Ethernet ports. Two of the ports
connect internally to the Demodulator Cards. The remaining two ports are connected to RJ-45
connectors on the front of the unit. One allows connection to the laptop required for control of
the Marlin. The other is an expansion port. This allows a second unit to be ‘daisy chained’, so
that both units may be controlled from a single laptop, or for the connection of compatible
accessories.

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Specifications
Ref Input
Target Connector
Satellite Connector
Input Impedance
Target Attenuation
Satellite Attenuation
Target Frequency Range
Satellite Frequency Range

BNC Female
TNC Female
50 Ω
0 – 60 dB in 30dB steps
0 – 24 dB in 6dB steps
1626.5 – 1660.5 MHz
1525.0 – 1559.0 MHz

Internal Frequency Reference
Reference Frequency
10 MHz
Reference Type
Temperature Compensated Crystal Oscillator (TCXO)
Reference stability
1ppm
Ethernet Control & Data Interface
Connector
Female RJ-45
Number of Connectors
2
Interface Type
10/100BaseT auto-negotiating
Description
Command input/data and status output, daisy chain to
subsequent unit
Physical
Unit Dimension

Card Size
Color

135mm (h) x 315mm (w) x225mm (d)
(excludes 19" rack mounting hardware)
5.2 kg unit standalone, 6 kg rack mounted
2 x Demodulator Cards
1 x Dual Down Converter
233 (h) x 220 (d)
RAL 9006 Light Grey

Operating Temperature
Storage Temperature
Relative Humidity
Cooling

0°C to +40°C
0°C to +60°C
10% to 90% non-condensing
Internal forced air cooling provided

Weight
Unit contents

CE Approval
Safety
EMC
External Power Supply
Voltage
Frequency
Voltage selection
Power Consumption
Dimensions
Weight

EN60950 LVD
EN55022 Emissions
EN55024 Immunity
115-230V AC
60-50 Hz
Auto-ranging
250W
65mm (h) x 188mm (w) x 95 (d)
0.8 kg

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