Comtech EF Data DD2401 User Manual
Page 55
DD2401 Satellite Demodulator
User Interfaces
MN-DD2401 - Rev. G
4-
31
(Decoders not in use default to locked state)
Opcode: <2A00h>
Command a Demodulator’s Configuration
<4>
<4>
<1>
<4>
<1>
<1>
<1>
<1>
<1>
<1>
<1>
<1>
<1>
<1>
<1>
<1>
<1>
<4>
<1>
<1>
Frequency
Data Rate
Sweep Boundary
External
Reference
Freq. Reference
Source
Input Level Limit
Demodulation
Type
Convolutional
Decoder
Reed-Solomon
Reed-Solomon N
Reed-Solomon K
Reed-Solomon T
RS Interleaver
Depth
Differential
Decoder
Descrambler
Control
Descrambler
Type
Spectrum
Buffer Size
Buffer Clock
Buffer Clock
Binary Value, 1 Hz Steps
Binary Value, 1 BPS Steps
Sweep Limits, Max of
±
42 kHz
Unsigned Binary Value in Hz
0 = Internal, 1 = External
Lower Level Limit, Binary Value, 1 dB Steps, Negative Sign Implied
0 = QPSK, 1 = BPSK, 2 = 8PSK, 4 = OQPSK
0 = None, 1 = Viterbi 1/2 Rate, 3 = Viterbi 3/4 Rate, 5 = Viterbi 7/8
Rate, 7 = Sequential 1/2 Rate, 9 = Sequential 3/4 Rate, 11 =
Sequential 7/8 Rate, 14 = Trellis 2/3, 20 = TPC 0.793 2D, 21 = TPC
0.495 3D, 23 = TPC ½, 24 = TPC ¾, 25 = TPC 7/8, 26 = TPC 21/44
0 = Disable, 1 = Enable
Unsigned Binary
Unsigned Binary
Note: Always set to Zero; as the T value is calculated from N and
K.
Unsigned Binary, 4 or 8
0 = Off, 1 = On
0 = Disable, 1 = Enable
0 = None, 1 = IBS Scrambler, 2 = V35_IESS, 3 = V35_CCITT, 4 =
V35_EFDATA, 6 = OM73, 7 = Reed Solomon Scrambler, 8 =
V35_EFRS, 9 = TPC Scrambler
0 = Normal, 1 = Inverted
Byte 1 – 2 = Buffer Size in ms
Byte 3 - 4 = Buffer Size in Bytes
0 = External, 1 = Internal, 2 = EXC, 3 = RX SAT
0 = Normal, 1 = Inverted