DMD2401/DMD2401L/DMD2401 IBS/IDR Satellite Modem
Technical Specifications
TM065 - Rev. 3.3
7-1
Section 7 – Technical Specifications
7.0 Introduction
This section defines the technical performance parameters and specifications for the DMD2401
and DMD2401L Satellite Modems.
7.1 Transmit and Receive Data Rates
BPSK, 1/2 Rate
4800 bps – 1250 Kbps
BPSK, 3/4 Rate
7200 bps – 1875 Kbps
BPSK, 7/8 Rate
8400 bps – 2187.5 Kbps
QPSK, 1/2 Rate
9600 bps – 2500 Kbps
QPSK, 3/4 Rate
14400 bps – 3750 Kbps
QPSK, 7/8 Rate
16800 bps – 4375 Kbps
OQPSK, 1/2 Rate 9600 bps – 2500 Kbps
OQPSK, 3/4 Rate 14400 bps – 3750 Kbps
OQPSK, 7/8 Rate 16800 bps – 4375 Kbps
(Optional)
8PSK, 2/3 Rate
Data Rate Setting:
Selectable in 1 bps steps
7.2 Modulator Specifications
Frequency Range:
50 – 90 and 100 – 180 MHz (or 950 – 1750 MHz
Optional L-Band), 1 Hz steps
Frequency Stability:
± 2.5 ppm (220 Hz at 88 MHz)
Level Control:
-5 to -30.0 dBm, 0.1 dB steps
Level Stability:
± 0.5 dB from 0 to 50°C
Impedance:
RU
)URQW3DQHO6HOHFWDEOH
Return Loss:
20 dB (minimum)
Output Off Isolation:
> 60 dB
Spurious Output:
< -55 dBc In-Band
< -45 dBc Out-of-Band
FEC:
1/2, 3/4, and 7/8 Viterbi, K = 7
1/2, 3/4, 7/8 Sequential (Optional)
2/3 Trellis (Optional)
Differential Encoding:
Selectable On or Off
Scrambler:
Intelsat V.35, mode selectable
7.3 Demodulator Specifications
Frequency Range:
50 – 90 and 100 – 180 MHz (or 950 – 1750 MHz
Optional L-Band), 1 Hz steps
Input Carrier Range:
C
o
+ 10 log (Symbol Rate)
C
o
min = -118
C
o
max = -93
Acquisition/Tracking:
± 1 kHz to ± 42 kHz, 1 kHz steps
Reacquisition range:
± 1 kHz to ± 42 kHz, 1 kHz steps
IF Input Impedance:
RU
)URQW3DQHO6HOHFWDEOH
Return Loss:
20 dB (minimum)
FEC:
1/2, 3/4, and 7/8Viterbi, K = 7
1/2, 3/4, and 7/8 Sequential (Optional)
2/3 Trellis (Optional)
Summary of Contents for DMD2401 IBS
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