Comtech EF Data SDM-309B - Manual (Page 229)

External Channel Unit SDM-309B Satellite Modem
C-C–22 MN/U-SDM309B Rev. #
3.0 Front Panel Operation
3.1 Configuration
Modem configuration may be viewed or changed by entering the “CONFIG” level from
the ‘sELECT” menu on the front panel. Figures C-13 through C-15 show the structure of
the front panel menu tree. The definitions of configurable functions follow:
TXR Transmitter rate selection. Select one of four predefined transmitter
coder/data rate combinations.
On entry the current transmitter rate is displayed with the flashing
cursor on the first character of the code rate on line one and the data
rate on line two. Use the arrow keys to select one of four predefined
rates.
Note: When the TX Rate has been programmed, the transmitter is
automatically turned off, to prevent swamping of other channels. To
turn on the transmitter, use the “RF_Out” function.
RXR Receiver rate selection. Select one of four predefined receiver
decoder/data rate combinations.
On entry the current receiver rate is displayed with the flashing cursor
on the first character of the code rate on line one and the data rate on
line two. Use the arrow keys to select one of four predefined rates.
TX_Freq Programs the modulator transmit frequency between 50 - 90 MHz or
100 - 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.
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 “RF_OUT” function.
RX_Freq Programs the demodulator receive frequency between 50 - 90 MHz or
100 - 180 MHz in 2.5 KHz Steps.
On entry, the current receive 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
execute the change.
RF_Out 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.