LRIT/HRIT System > L-Band Receivers

Dartcom USB LRIT receiver

USB LRIT receiver specifications

RF input frequency 135–144MHz (1688.5–1697.5MHz from a 1691MHz to 137.5MHz LNB)
Frequency resolution 5kHz
RF input connector 50Ω BNC
RF input level –15dBm to –75dBm
Symbol rates 64ksps to 1024ksps
Viterbi decoding ½, K=7, G1=171, G2=133
Demodulator modes QPSK, BPSK
Data encodings NRZ-S, NRZ-M, NRZ-L
Digital interface USB port
Power requirements 15V DC @ 2A
LNB power 14–15V DC nominal @ 0.75A via RF input
PSU External switch mode, input 100–240V AC 47–63Hz @ 1.2A
Dimensions (W×H×D) 175×60×240mm
Weight 1.7kg (including PSU)

Dartcom USB LRIT/HRIT receiver rack

USB LRIT/HRIT receiver rack specifications

RF input frequency 126–154MHz
RF input connector 50Ω N-type
IF conversion Direct, 70MHz, 50MSPS, 10-bit
Frequency resolution 25kHz
Symbol rates 0.1Msps to 3.5Msps
Viterbi decoding ½, K=7, G1=171, G2=133, 5.2dB coding gain at 1:105 BER
Demodulator modes QPSK, BPSK, PSK
Data encodings NRZ, NRZ-S, NRZ-M, Biphase-L
Performance QPSK/BPSK within 1dB of theoretical, 0.5dB typical
Digital interface USB port
Power requirements 100–240V AC 50–400Hz

USB LRIT receiver

  • High-quality, low-cost receiver for direct broadcast LRIT transmissions from MSG, GOES, COMS-1 and Electro services.
  • Fully compatible with the forthcoming GOES-R HRIT service.
  • 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 detection.
  • 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).

USB LRIT/HRIT receiver rack

  • High quality, high performance, professional grade receiver for direct broadcast LRIT and HRIT transmissions from MSG, GOES and COMS-1 services.
  • 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 also provide HRPT/AHRPT reception by purchasing additional plug-in modules together with a tracking antenna system and Dartcom Polar Orbiter Ingester software.

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