SLM-3650 Satellite Modem
Revision 3
Operation
MN/SLM3650.IOM
3–13
3.4.2
Function Select: Configuration: Demodulator
Refer to Figure 3-5.
RX-X CODE_RATE/TYPE
Upon entry, the current RX rate is displayed with the flashing cursor on the first character of
the code rate on Line 1. Line 2 displays the data rate. Press [
←
] or [
→
] to make the selection.
To select the currently defined variable data rate, select RX-V, and press [ENTER] twice.
To change the rate using the variable rate selection, press [ENTER] when RX-V is displayed.
A flashing cursor is displayed on the first character of the coding type on Line 1. Press [
←
] or
[
→
] to move the flashing cursor, and [
↑
] or [
↓
] to increment or decrement the digit at the
flashing cursor. Press [ENTER] to execute the change.
Refer to 3.3 for Code/Data Rates.
Refer to Table 4-1 for RX Code/Data Rate Default settings.
RX-IF FREQUENCY
Programs the demodulator receive frequency between 50 and 180 MHz,
in 1 Hz steps.
Upon entry, the current receive frequency is displayed with the flashing cursor on the first
character. Press [
←
] or [
→
] to move the flashing cursor, and [
↑
] or [
↓
] to increment or
decrement the digit at the flashing cursor. Press [ENTER] to execute the change.
DESCRAMBLER
Programs the descrambler ON or OFF.
Upon entry, the current status of the descrambler is displayed. Press [
↑
] or [
↓
] to make the
selection. Press [ENTER] to execute the change.
DIFF. DECODER
Programs the differential decoder ON or OFF.
Upon entry, the current status of the differential decoder is displayed. Press [
↑
] or [
↓
] to make
the selection. Press [ENTER] to execute the change.
Note: Always OFF in Turbo mode.
RF LOOPBACK
(Test Mode Configuration)
Programs the modem for RF loopback operation.
When RF loopback is turned ON, the demodulator is programmed to the same frequency as
the modulator. When RF loopback is turned OFF, the demodulator is tuned to the previous
frequency. Refer to Figure 3-23 for a block diagram of RF loopback operation.
Note: RF loopback nullifies IF loopback.
Upon entry, the current status of the RF loopback is displayed. Press [
↑
] or [
↓
] to make the
selection. Press [ENTER] to execute the change.
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