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SDM-300L3 Satellite Modem
Front Panel Operation
FUNCTION SELECT: CONFIGURATION: MODULATOR:
CARRIER MODE
Programs the modem for alternate carrier modes. All modes, except Normal-Modulated
are Test Modes. Four modes of operation are available:
NORMAL-MODULATED
CENTER-CW
DUAL-CW
OFFSET-CW
Upon entry, the Center mode is displayed. To activate this test mode, press <ENTER>.
Press [↑] or [↓] to select the desired mode. To return to the Configuration menu, press
[CLEAR].
FUNCTION SELECT: CONFIGURATION: MODULATOR:
MODEM REFERENCE
Select either: Internal, EXT1 MHz, EXT5 MHz, EXT 10MHz, EXT 20MHz, or
Output 10 MHz.
IMPORTANT
Upon entry, the current status of the scrambler is displayed. Press [↑] or [↓] to make the
selection. Press <ENTER> to execute the change.
Note: If any EXT REF is selected for the modem reference and is disconnected or not
present at CP3, an alarm is generated, and the modem switches to its Internal Clock.
CARRIER MODE
NORMAL-MODULATED
This mode is normally selected.
Generates a CW-carrier at the current modulator frequency. This can be used to
measure the output frequency.
Generates a dual side-band suppressed carrier signal. Side-bands are at one-half of
the symbol rate from the carrier. This is used to check the channel balance and
carrier null.
Generates a single, upper, side-band-suppressed carrier signal. The upper side-
band is at one-quarter of the symbol rate from the carrier. When inverted spectrum
is selected, this generates a single, lower, side-band-suppressed carrier.
MODEM REFERENCE
INTERNAL
Use only Internal or EXT 10 MHz with a Block Up Converter (BUC) or
Outdoor Unit (ODU).
4–13
Revision 1
MN/SDM300L3.IOM
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