SLM-3650 Satellite Modem
Revision 3
Operation
MN/SLM3650.IOM
3–10
SCRAMBLER
Programs the scrambler ON or OFF.
Upon entry, the current status of the scrambler is displayed. Press [
↑
] or [
↓
] to make the selection.
Press [ENTER] to execute the change.
DIFF. ENCODER
Programs the differential encoder ON or OFF.
Upon entry, the current status of the differential encoder is displayed. Press [
↑
] or [
↓
] to make the
selection. Press [ENTER] to execute the change.
CARRIER MODE
(Test Mode Configuration)
Programs the modem for continuous wave mode. Four modes of operation are available:
NORMAL-MODULATED:
The Carrier mode is normally in the OFF position.
CENTER-CW:
Generates a carrier at the current modulator frequency. This can be used to
measure the output frequency.
DUAL-CW:
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.
OFFSET-CW:
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.
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].
Note: When [CLEAR] is pressed, the modem is configured to the state before CW mode was
invoked. The transmitter is automatically turned OFF to prevent the possible swamping of other
channels. To turn the transmitter ON, use the IF Output function.
MODEM REFERENCE
Use only Internal or EXT10 MHz with a Block Up Converter (BUC) or Outdoor Unit (ODU).
Program the following references to the modulator:
INTERNAL.
1, 5, 10, and 20 MHz external references (CP3)
10 MHz Out (High Stability Option only)
Note: If any EXT REF is selected for the modem reference and there is no input to CP3, the
modem will detect an alarm and switch to the INT CLK.
Upon entry, the Internal mode is displayed. Press [
↑
] or [
↓
] to make the selection. Press [ENTER]
to execute the change.
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