Comtech EF Data CDM-740 - Manual (Page 123)

CDM-740 Advanced Satellite Modem Revision 0
Remote Control MN-CDM740
A–9
A.5.2 Rx Parameters
Priority System: RF1 (Highest priority) and RL1 (Lowest Priority), indicated by shading.
Any change to a higher priority parameter can override any of the parameters of lower priority.
Parameter
Type
Command
(Instruction
& Qualifier)
Number of
Arguments
Description of Arguments
Response to
Command
Query
(Instruction
& Qualifier)
Response to Query
Rx 1
Frequency RF1= 9 bytes
Command or Query.
Rx Terminal Frequency, the frequency (MHz) being received from the
satellite, in the form xxxxx.xxx. where:
xxxxx.xxx = 950.000 MHz to 65000.000 MHz (L-band)
Resolution=1kHz.
Examples:
If RX 1 LO is 00000, then the Rx 1 Frequency is entered as L-Band
direct – 950.000 to 2150.000;
If RX 1 LO is set in the range of 30000 to 65000, the Rx 1 Frequency is
+/- the Rx 1 LO, and this will be the resulting L-Band frequency the
modem will expect to receive.
RF1=
RF1?
RF1*
RF1# RF1? RF1=xxxxx.xxx
(see Description of
Arguments)
Rx 1 LO RL1= 6 Bytes Command or Query.
LNB Rx LO frequency information in MHz, in the form xxxxxs, where:
xxxxx = LO Frequency ranges 03000 through 65000 MHz,or
00000 = (Off)
s = sign for the MIX [– (negative) or + (positive)]
Notes:
1. Negative mix induces a spectral inversion.
2. Actual RX Frequency = RX 1 Frequency +/- modem Rx 1 LO
RL1=
RL1?
RL1*
RL1# RL1? RL1=xxxxxs (see
Description of Arguments)
Rx 1 Polarity LP1=
1 byte Command or Query.
Rx 1 Tuner Polarity, where
0=Off
1=Horizontal (18V)
2=Vertical (13V)
LP1=
LP1?
LP1*
LP1# LP1?
LP1=x
(see Description of
Arguments)
Rx 1 LNB 22
KHz Tone LT1= 1 bytes, 0 or 1 Command or Query.
Rx 1 LNB 22KHz Tone, where:
0=Off
1=On
Example: LT1=1 (LNB 22Hz Tone is On)
LT1=
LT1?
LT1*
LT1# LT1? LT1=x
(see Description of
Arguments)
Rx 1 Alpha
Rolloff RA1= 1 byte, 0, 1 or 2 Command or Query.
Rx Alpha Rolloff, where:
0 = 20%
1 = 25%
2 = 35%
Example: RA1=1 (sets Rx Alpha Rolloff of 20%)
RA1=
RA1?
RA1*
RA1# RA1? RA1=x