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 IAF DMDD Indoor Unit  
 
Features of DMDD Receiving System :
BPSK, QPSK (selectable) Demodulation
Meets the Data Rate of 64kbps to 512kbps
Intelsat Viterbi Error Correction
Employs the latest digital technology to deliver high performance
Enhanced performance for larger threshold margins
Supplies power (+24 VDC) to the LNB via the IF input port.
Monitor and Control Port Through EIA 232 Port
Wall Mount Rugged Enclosure for Military Applications
Sustains Harsh Environmental Specifications
 
Specification of DMDD Indoor Unit (DMDD IDU) :
IF input Frequency range 950 MHZ to 1450 MHZ in 10 kHz Steps
Input Signal Range -40 dBm to -80 dBm
Input Impedance 75 ohm
Demodulation BPSK / QPSK
Error Decoding Viterbi, Rate ½, K=7
De – Scrambling V.35
Link Bit Rate 64 Kbps to 128 Kbps
BER 1 x 10-7 Typical for Eb/No > 7
Eb/No. > 8 for Satisfactory DMDD Link Operation
Data Output Port RJ 45 port Ethernet interface for PC to receive data (RS 422 Interface available inside the DMDD IDU chassis, RS 422 data converted to Ethernet data inside the DMDD IDU chassis.
IF Signal Output 950 MHZ to 1450 MHZ, 3 meter cable with N female connector for monitoring on spectrum analyzer.
Automatic Start All default setting e.g. frequency, bit rate, modulation, ID etc. are stored in memory on power failure.
Indications LED Power on, Carrier detect, fault, LAN, WAN
LNBC voltage 24 V +/- 1 volt for 500 ma maximum
Power Supply 230 VAC ± 10%
Operating Temperature 0 to 50 deg C
   
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