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L-band hardware
Required for L-band MSG LRIT/HRIT, GOES LRIT and MTSAT LRIT/HRIT reception. Click here to see the areas covered.
- Solid powder-coated aluminium (1.2m, 1.8m) or glass-fibre reinforced precision compression moulded polyester reflector with three segments (2.4m) or eight segments (3.0m, 3.7m).
- Supplied with galvanised steel azimuth/elevation mount and pedestal, and up to 100m of RG213 50Ω co-axial cable.
- Feed horn (1.2m, 1.8m) or scalar feed horn (2.4m, 3.0m, 3.7m) with N-type output to downconverter.
- LNA/downconverter designed for harsh radio environments with pre-select filter to reduce cellular phone and radar interference.
- Low noise figure of 1.2dB (92K) typical.
- Weatherproof O-ring sealed machined case and connectors.
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Left: 3.0m/3.7m L-band dish antenna and LNB; Right: 1.2m/1.8m/2.4m L-band dish antenna and LNB

Left: L-band LNA/downconverter; Right: L-band scalar feed (2.4m/3.0m/3.7m dishes)
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Specifications of L-band dish antennas:
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1.2m
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1.8m
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2.4m
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3.0m
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3.7m
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Reflector type
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Prime focus parabolic
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Prime focus parabolic
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Prime focus parabolic
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Prime focus parabolic
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Prime focus parabolic
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Reflective material
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Solid aluminium, powder coated
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Solid aluminium, powder coated
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3-segment glass-fibre reinforced polyester
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8-segment glass-fibre reinforced polyester
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8-segment glass-fibre reinforced polyester
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Diameter
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1.2m
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1.8m
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2.4m
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3.0m
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3.7m
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F/D ratio
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0.38
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0.42
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0.37
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0.30
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0.37
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Gain
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24dBi
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27.5dBi
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30.3dBi
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32.2dBi
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34.1dBi
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Polarisation
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Linear
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Linear
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Linear
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Linear
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Linear
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G/T @ 5° elevation
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2.2dB/K
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6dB/K
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9.6dB/K
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11.7dB/K
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13.5dB/K
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Operational wind speed
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112km/h
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112km/h
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80km/h
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72km/h
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72km/h
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Survival wind speed
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201km/h
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201km/h
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201km/h
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201km/h
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201km/h
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Specifications of L-band feed and LNA/downconverter:
Feed type
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Horn (1.2m/1.8m dishes)
Scalar horn (2.4m/3.0m/3.7m dishes)
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Polarisation
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Linear
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RF input
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1691MHz ±25MHz
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LNA noise figure
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1.2dB typical
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Pre-LNA filter
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3-pole, –3dB ±60MHz
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Total gain
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>50dB
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LO frequency
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1553.5MHz
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RF output
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137.5MHz ±25MHz
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- High-quality, low-cost receiver for LRIT transmissions from MSG direct broadcast, GOES and MTSAT.
- Housed in a sleek, compact, durable extruded aluminium case with styled ABS bezels.
- USB interface for fast, reliable data transfer to the host computer.
- Fully software controlled, with detailed status reports available.
- Built-in time-stamped fault logging.
- 20-LED real-time signal level display for easy dish alignment and operational signal monitoring.
- Status LEDs for LNB power, signal lock, USB ready, control communications, data buffer status and frame synchronisation.
- Available with 70MHz or 137.5MHz fixed frequency RF input, or 950–1450MHz tuneable RF input.
- Adjustable RF attenuator to accommodate LNB signal inputs between –15dBm and –75dBm.
- Supports QPSK and BPSK demodulation.
- Built-in hardware Viterbi decoding.
- Supplies power to the LNB via the RF input.
- Powered by an external switch mode PSU (supplied).
- DC–DC converter PSU also available for battery or portable operation (input 10.6–15V DC).
- Can be supplied without a dish antenna or LNB for upgrading WEFAX systems if existing components are suitable. Please contact us to discuss this.
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Dartcom USB LRIT receiver
RF input frequency
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70MHz or 137.5MHz fixed, or 950MHz to 1450MHz tuneable
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RF input connector
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Fixed: 50Ω BNC
Tuneable: 75Ω F-type
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RF input level
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–15dBm to –75dBm
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Symbol rates
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64kSPS to 300kSPS
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Viterbi decoding
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1/2, K=7, G1=171, G2=133
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Demodulator modes
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QPSK, BPSK
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Data encodings
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NRZ-S, NRZ-M, NRZ-L
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Digital interface
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USB port
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Power requirements
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15V DC @ 2A
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LNB power
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14–15V DC nominal @ 0.75A via RF input
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PSU
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External switch mode, input 100–240V AC 47–63Hz @ 1.2A, output 15V DC @ 3.4A
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Dimensions (W×H×D)
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175×60×240mm
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Weight
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1.7kg (including PSU)
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- High quality, high performance, professional grade receiver for LRIT and HRIT transmissions from MSG direct broadcast, GOES and MTSAT.
- Available in LRIT, HRIT or combined LRIT/HRIT configurations.
- Rugged 4U-high 19" rack.
- Plug-in modules for ease of maintenance and to allow for future upgrades.
- USB interface for fast, reliable data transfer to the host computer.
- Fully software controlled, with detailed status reports available.
- Comprehensive LED and character matrix status displays and diagnostic points on the front panel.
- Supplied with up to two state-of-the-art multi-mode DSP receiver modules and USB interface modules.
- Each receiver module supplies power to the LNB via its RF input.
- Supports QPSK, BPSK and PSK demodulation.
- Built-in hardware Viterbi decoding.
- Rack or desk mount versions available.
- Powered by 100–240V AC mains, 50–400Hz.
- Upgradable to support HRPT or AHRPT/LRD by purchasing additional plug-in modules together with a tracking antenna system and associated ingest software.
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Dartcom USB LRIT/HRIT receiver rack
RF input frequency
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126MHz to 154MHz
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RF input connector
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50Ω N-type
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IF conversion
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Direct, 70MHz, 50MSPS, 10-bit
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Frequency resolution
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25kHz
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Symbol rates
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0.1MSPS to 3.5MSPS
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Viterbi decoding
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1/2, K=7, G1=171, G2=133, 5.2dB coding gain at 10–5 BER
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Demodulator modes
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QPSK, BPSK, PSK
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Data encodings
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NRZ, NRZ-S, NRZ-M, Biphase-L
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Performance
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QPSK/BPSK within 1dB of theoretical, 0.5dB typical
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Digital interface
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USB port
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Power requirements
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100–240V AC @ 50–400Hz
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