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Description
Tx Power
Modem Configuration
Frequency:
The L-Band frequency range is from 950 to 2000 MHz.
Spectrum:
Select Normal or Invert.
Spectral inversion is used for modem compatibility between modem manufactures.
Scrambler:
Scramblers can be set to Off, V.35, Modified-V.35, Synch (Reed Solomon), Intelsat
Business Service (IBS), Turbo, or OM73. These settings are dependent on Modem
Type.
Spreading Factor:
The Spread Factor distributes the user information over a larger frequency
bandwidth. The symbol rate is multiplied by the Spreading Factor number and is then
called the Chip Rate.
Polyn:
Polynomial 1 is compatible with the SLM-5650B.
•
It is not backwards compatible with the SLM-5650A.
•
Polynomial 0 is backwards compatible with the SLM-5650A and
•
SLM-5650B.
GSN:
The GSN sets or returns the Tx Spreading Equation in the form abbbb, where:
a = 0 (for Polynomial 0) or 1 (for Polynomial 1):
For Polyn 0, the GSN can be any number between 0-9999.
•
For Polyn 1, the GSN can be any number between 0-4095.
•
Rx Sweep Width:
The Sweep Width is only set on the Rx. This value is normally set to 60 KHz. Reduce
the value when using DSSS spreading at low data rates. Adjust the Receive sweep
bandwidth to the minimum of either 60 kHz or 0.6 times the symbol rate when using
Spreading Factors greater than 1 at low data rates.
Adjust and turn on Tx power.
Rolloff:
The rolloff is fixed at 1.2 times the Chip Rate.
6–15
SLM-5650C / SLM-5650C-ODU Satellite Modem
Parameters
Revision 1
MN-SLM-5650C
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