SLM-3650 Satellite Modem
Revision 3
Operation
MN/SLM3650.IOM
3–9
3.4.1
Function Select: Configuration: Modulator
Refer to Figure 3-4.
TX-X CODE_RATE
Upon entry, the current transmitter 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 TX-V, and press [ENTER] twice. To
change the rate using the variable rate selection, press [ENTER] when TX-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 code/data rate default settings
TX-IF FREQUENCY
Programs the modulator transmit frequency between 50 and 180 MHz,
in 1 Hz steps.
Upon entry, the current transmitter 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.
Note: When the transmitter frequency is changed, the transmitter is automatically turned off to
prevent the possible swamping of other channels.
To turn the transmitter on, use the TX-IF Output function.
TX-IF OUTPUT
Programs the modulator output ON or OFF.
Upon entry, the current status of the output is displayed. Press [
↑
] or [
↓
] to make the selection.
Press [ENTER] to execute the change.
TX POWER LEVEL
Conditional:
An offset can be added through the Function Select: Utility menu to remove losses
or gains in the system.
Programs the modulator output power level within:
-5 to -30 dBm, normal range
+5 to -20 dBm, high power option
-129 to +104 dBm, user offset adjust
Upon entry, the current transmitter power level is displayed with the flashing cursor on the first
character. Press [
↑
] or [
↓
] to increase or decrease the output power level in 0.1 dBm steps. Press
[ENTER] to execute the change.
Note: The front panel display may be changed in the power offset utility. Using that function does
not change the actual output power level.
The high power oscillator option is +5 to -20 dB. The window displays AUPC_PWR when the
AUPC is turned on in the AUPC Configuration menu.
For more information, refer to Section 3.1.3.10.
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