B.3 configuration commands/responses, B.3.1 modulator – Comtech EF Data SDM-9000 User Manual
Page 222

Remote Control Operation
SDM-9000 Satellite Modem
B–4
Rev. 4
B.3 Configuration Commands/Responses
B.3.1 Modulator
Modulator
Frequency
Command:
Response:
Status:
Response:
RF_OFF'cr''lf']
Where: nnn.nnnn = Frequency in MHz, 50.0000 to 180.0000, in
2.5 kHz steps.
Note: When the modulator frequency is programmed, the RF
output is switched OFF.
RF Output
(IF Output)
Command:
Response:
Status:
Response:
Where: xxx = ON or OFF.
Modulator
Rate Preset
Assignment
Command:
Response:
mm'cr''lf']
Where:
x = A, B, C, or D (preset designator).
nnnnn = One of the following coder rates:
1/2 (QPSK 1/2)
3/4 (QPSK 3/4)
7/8 (QPSK 7/8)
16Q34 (16QAM 3/4)
16Q78 (16QAM 7/8)
8P23 (8PSK 2/3)
8P56 (8PSK 5/6)
N/A (Not Assigned)
mmmmm.mmm = Data rate in kHz.
Note: If the filter is calibrated for the Reed-Solomon, '+RS' will
be appended to the code rate. Example: 3/4+RS_44736.0.
Modulator
Rate Preset
Selection
Command:
Response:
Status:
RF_OFF'cr''lf']
See MR command.
Where: x = A, B, C, or D (preset designator).
Notes:
1. Setting the modulator rate turns OFF the RF transmitter.
2. If the filter is calibrated for the Reed-Solomon, '+RS' will
be appended to the code rate. Example:
3/4+RS_44736.0.
Modulator
Power
Offset
Command:
Response:
Status:
Response:
Where: snn.n = +40.0 to -40.0, in 0.1 dB increments.
Note: The modulator power offset is added to the nominal
power level to adjust the transmit power range.
Modulator
Output
Power Level
Command:
Response:
Status:
Response:
Where: snn.n = -20.0 to +5.0, in 0.1 steps (nominal range in
dBm).
Note: The nominal power range is modified relative to the value
specified by the modulator power offset (MPO_).