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SLM-7650 Satellite Modem
Operation
Menu Item
SCRAMBLER
DIFF. ENCODER
CARRIER MODE
(Test Mode Configuration)
RS ENCODER
Programs the scrambler On or Off.
On entry, the current status of the scrambler is displayed. Press an arrow key to
make the selection. Press [ENTER] to execute the change.
Programs the differential encoder On or Off.
On entry, the current status of the differential encoder is displayed. Press an arrow
key to make the selection. Press [ENTER] to execute the change.
Programs the modem for continuous wave mode. Four modes of operation are
available:
Normal (Off): The Carrier mode is normally in the OFF position. To execute any
of the Carrier continuous wave modes, enter the Carrier mode and
select the test mode of choice.
Center: Generates a carrier at the current modulator frequency. This can be
used to measure the output frequency.
Dual:
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: Generates a single upper side-band suppressed carrier signal. The
upper side band is at one-quarter of the symbol rate from the carrier.
This is used to check the quadrature.
On entry, the Center mode is displayed. To activate this test mode, press [ENTER].
Press an arrow key to select the desired mode.
To return to the Configuration menu, press [CLEAR].
Programs the Reed-Solomon encoder On or Off.
On entry, the current status of the Reed-Solomon encoder is displayed. Press an
arrow key to make the selection. Press [ENTER] to execute the change.
Notes:
1.
Programming the Reed-Solomon encoder automatically turns off the
RF transmitter.
2.
A double beep will occur when attempting to turn on Reed-Solomon if
the data rate and overhead type are invalid.
3-9
Specifications/usage
Revision 4
MN/SLM7650.IOM
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