- 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.
- 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.
- 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
|
|
|
3.0m/3.7m parabolic dish antenna and LNB
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
|
|
