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SDM-309B Satellite Modem
3.2.2.1 MOD Configuration
TXA
TX_Freq
RF_Out
TX_Power
DifEncdr
MN/U-SDM309B Rev. #
Transmitter rate selection. Select one of four predefined
transmitter coder/data rate combinations or a variable rate
selection.
On entry the current transmitter rate is displayed with the flashing
cursor on the first character of the code rate on line one. The data
rate is displayed on line two. Use the arrow keys to select one of
four predefined rates. Filters that are not present may display as
"N/A" (not assigned) and can not be programmed. If your modem
is equipped with the variable rate option you can also select TXV
and enter the desired data rate.
Programs the modulator transmit frequency between 50 and 90
MHz or 110 and 180 MHz in 2.5 KHz Steps.
On entry the current transmitter frequency is displayed with the
flashing cursor on the first character. Use the right and left arrow
keys to move the flashing cursor and the up and down arrow keys
to increment or decrement the digit at the flashing cursor. Press
the "ENTER" key to execute the change.
To change the rate using the variable rate selection, press the
"ENTER" key when "TXV is displayed. A flashing cursor will be
displayed on the first character of the coding type on line one. Use
the right and left arrow keys to move the flashing cursor and the up
and down arrow keys to increment or decrement the digit at the
flashing cursor. Press the "ENTER" key to execute the change.
Note: The transmitter frequency is programmable within the
specified range (50 - 90 MHz or 110 - 180 MHz) in 2.5 KHz Steps.
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 "RF_OUT" function.
Programs the modulator output to On or Off.
On entry the current status of the output is displayed with the
flashing cursor on the first character. Use the arrow keys to select
ON or OFF. Press the "ENTER" key to execute the change.
Programs the modulator output power level from -5 dB to -30 dBm
in 0.5 dB Steps.
On entry the current transmitter power level is displayed with the
flashing cursor on the first character. The up and own keys are
used to increase or decrease the output power level in 0.5 dBm
Steps. Press the "ENTER" key to execute the change.
Note: If your modem has the high power Mod option installed (-11
modulator), you must change the output power range on the front
panel. Enter the Utility menu and find Pow Adj. Press the "ENTER"
key and adjust the maximum output power to read +5.0 dB using
the up arrow. This will make the TX power read +5.0 to -20.0 dB,
the output range of a high power mod.
Programs the differential encoder On or Off.
On entry the current status of the DifEncdr is displayed with the
flashing cursor on the first character. Use the arrow keys to select
ON or OFF. Press the "ENTER" key to execute the change.
Operation
3–27
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