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->3.0m or 3.7m parabolic dish

->Feed, LNA and downconverter

->USB GVAR/LRIT receiver rack

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.
  • Available in GVAR or combined GVAR/LRIT 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 with LRIT option.
  • Rack or desk mount versions available.
  • Powered by 100–240V AC mains, 50–400Hz.


Specifications of Dartcom USB GVAR/LRIT receiver rack:

RF input frequency
126MHz to 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
(with LRIT option)

1/2, K=7, G1=171, G2=133, 5.2dB coding gain at 10–5 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

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

Specifications of parabolic dish antennas:

  3.0m
3.7m
Reflector type
Prime focus parabolic
Prime focus parabolic
Reflective material
8-segment GRP
8-segment GRP
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
Operational wind
72km/h
72km/h
Survival wind
201km/h
201km/h

Specifications of feed and LNA/downconverter:

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