GVAR System > Specifications

3.0m/3.7m parabolic dish antenna and LNB
3.0m/3.7m parabolic dish antenna and LNB

Dartcom USB GVAR/LRIT receiver rack
Dartcom USB GVAR/LRIT receiver rack

Dartcom GVAR Ingester software
Dartcom GVAR Ingester software

3.0m or 3.7m parabolic dish

  • Glass-fibre reinforced precision compression moulded polyester reflector with eight segments.
  • Supplied with galvanised steel azimuth/elevation mount and pedestal, and up to 100m of RG213 50Ω co-axial cable.

Feed, LNA and downconverter

  • Scalar feed horn 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.

USB GVAR/LRIT receiver rack

  • High quality, high performance, professional grade receiver for GVAR and LRIT transmissions from GOES satellites.
  • Fitted with single USB interface module and receiver as standard for GVAR reception only.
  • Optional additional USB interface module, receiver and Dartcom XRIT Ingester software for simultaneous GOES LRIT reception.
  • Rugged 4U-high 19” rack.
  • Plug-in modules for ease of maintenance and upgrade.
  • USB interface for fast, reliable data transfer to the ingest PC.
  • Fully software controlled, with detailed status reports available.
  • Comprehensive LED and matrix status displays.
  • Diagnostic points on the front panel.
  • State-of-the-art multi-mode DSP receivers.
  • Each receiver module supplies power to the LNB via its RF input.
  • Supports QPSK, BPSK and PSK demodulation.
  • Built-in hardware Viterbi decoding with LRIT option.
  • Rack or desk mount versions available.
  • Powered by 100–240V AC mains, 50–400Hz.

Parabolic dish antenna specifications

 3.0m antenna3.7m antenna
Reflector type Prime focus parabolic Prime focus parabolic
Reflective material 8-segment GRP 8-segment GRP
Reflector diameter 3.0m 3.7m
F/D ratio 0.30 0.37
Gain 32.2dBi 34.1dBi
Polarisation Linear Linear
G/T @ 5° elevation 11.7dB/K 13.5dB/K
Wind speeds 72km/h operational
201km/h survival
72km/h operational
201km/h survival

USB GVAR/LRIT 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

Feed and LNA/downconverter specifications

Feed type Scalar horn
Polarisation Linear
RF input 1691MHz ±25MHz
LNA noise figure 1.2dB typical
Pre-LNA filter 3-pole, –3dB ±60MHz
Total gain >50dB
LO frequency 1553.5MHz
RF output 137.5MHz ±25MHz

iDAP/MacroPro Software