Specifications

DMD20/20LBST Universal Satellite Modem User Interfaces
MN-DMD20-20LBST Revision 14 4–17
REACQ RANGE (Hz) {0 – 65535 Hz}
Allows the user to set the reacquisition sweep in 1 Hz
increments.
ADJ CARRIER PWR {Normal, Suppressed}
Allows the user to indicate adjacent carrier as Normal or
Suppressed (High Power). Unit will increase or decrease post
decimination gain appropriately.
FAST ACQUISITION {DISABLED, ENABLED}
Allows the user to disable or enable the Rx fast acquisition
capability.
Limitations of Fast Acquistion:
The maximum symbol rate for Fast Acquistion is 1028Ksps.
Fast Acquistion must be disabled for rates greater than 1028Ksps.
Only supports QPSK and 8PSK in a NON-DVB MODE.
Does not support spectral inversion applications.
INPUT THRESHOLD (dBm) {-30 to 90 dbm}
Allows the user to adjust the low level threshold limit for input
power. Input power level below the threshold limit will trigger a
major alarm on the demodulator.
EB/NO ALARM {0.0 to 9.90 db}
Allows the user to set the desired E
b
/N
o
for the local receiver.
This setting is compared against the receive E
b
/N
o
and
commands to the remote modem to increase or decrease
Transmit Power accordingly are sent.
DATA (menu)
DATA RATE (bps) {Refer to Technical Specs for Data Rates}
Allows the user to set the Data Rate in bps steps via the Front
Panel Arrows or Keypad.
SYMB RATE (sps) Allows the user to view the Symbol Rate.
INNER FEC Viterbi {1/2, 3/4, 7/8, None}
Optional FEC Rates:
Sequential {1/2, 3/4, 7/8}
CSC {3/4}
Trellis (8PSK) {2/3}
Turbo (BPSK) {21/44,3/4, 7/8}
Turbo (OQPSK/QPSK) {1/2, 3/4, 7/8}
Turbo (8PSK/8QAM) {3/4, 7/8}
Turbo (16QAM) {3/4, 7/8}
DVB VIT {1/2, 2/3, 3/4, 5/6, 7/8}
DVB Trellis {2/3, 3/4, 5/6, 7/8, 8/9}
LDPC (B/O/QPSK) {1/2, 2/3, 3/4}
LDPC (8PSK/8QAM) {2/3, 3/4}
LDPC (16QAM) {3/4}
Allows the user to select the Rx Code Rate and Type
IMPORTANT