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CDM-740 Advanced Satellite Modem
Remote Control
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.
Command
Parameter
Number of
(Instruction
Type
Arguments
& Qualifier)
Rx 1
RF1=
9 bytes
Frequency
Rx 1 LO
RL1=
6 Bytes
Rx 1 Polarity
LP1=
1 byte
Rx 1 LNB 22
LT1=
1 bytes, 0 or 1
KHz Tone
Rx 1 Alpha
RA1=
1 byte, 0, 1 or 2
Rolloff
Description of Arguments
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.
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
Command or Query.
Rx 1 Tuner Polarity, where
0=Off
1=Horizontal (18V)
2=Vertical (13V)
Command or Query.
Rx 1 LNB 22KHz Tone, where:
0=Off
1=On
Example: LT1=1 (LNB 22Hz Tone is On)
Command or Query.
Rx Alpha Rolloff, where:
0 = 20%
1 = 25%
2 = 35%
Example: RA1=1 (sets Rx Alpha Rolloff of 20%)
A–9
MN-CDM740
Query
Response to
(Instruction
Response to Query
Command
& Qualifier)
RF1=
RF1?
RF1=xxxxx.xxx
RF1?
(see Description of
Arguments)
RF1*
RF1#
RL1=
RL1?
RL1=xxxxxs (see
Description of Arguments)
RL1?
RL1*
RL1#
LP1=
LP1?
LP1=x
LP1?
(see Description of
LP1*
Arguments)
LP1#
LT1=
LT1?
LT1=x
LT1?
(see Description of
LT1*
Arguments)
LT1#
RA1=
RA1?
RA1=x
RA1?
RA1*
RA1#
Revision 0
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