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Comtech EF Data SDM-100A User Manual

Page 90

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Operation

SDM-100A Satellite Modem

3–56

Rev.

0

RX-X Code_Rate/Type

Receiver rate selection.

Four predefined receiver decoder/data rate combinations are
available:

• A

• B

• C

• D


A variable rate selection (V) may also be selected. These settings
must first be set up in the Utility menu.

On entry, the current receiver rate is displayed with the flashing
cursor on the code rate on line 1. The data rate is displayed on
line 2. Press [

] or [

] to select one of four predefined rates. To

select the variable data rate, select RX-V and press [ENTER]
twice to select the currently defined data rate.

TX-IF Frequency

Programs the modulator transmit frequency between 50 and 180
MHz, in 2.5 kHz steps.

On 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 IF output
function.

RX-IF Frequency

Programs the demodulator receive frequency between 50 and
180 MHz, in 2.5 kHz steps.

On 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.

TX-IF Output

Programs the modulator output to ON or OFF.

On entry, the current status of the output is displayed. Press [

] or

[

] to select ON or OFF. Press [ENTER] to execute the change.