Config: Rx; Config:) Rx If; Config:) Rx Freq (Frequency); Config:) Rx Fec - Comtech EF Data CDM-740 Installation And Operation Manual

CDM-740 Advanced Satellite Modem
Front Panel Operation
5.4.2

CONFIG: Rx

Rx-IF Freq FEC
(Data 9980.000kbps, 2851.429ksym)
Select IF, Freq, FEC, Demod, Data, Descram, or Pilot using the ◄ ► arrow keys, then press
ENTER.
5.4.2.1 (CONFIG:) Rx
Alpha Rolloff: .20
Spectrum Invert:
When in DVB-S2 mode only: To set the expected filter Rx Alpha Rolloff (α) of the carrier, on
the top line select .20 (20%), .25 (25%), or .35 (35%) using the
selection is 0.20 (20%).
The Rx Alpha Rolloff (α) dictates how fast the spectral edges of the carrier are attenuated beyond
the 3 dB bandwidth. With 20% rolloff the edge falls off more quickly than with 25% and 35%.
Note: This menu is not valid in DVB-S mode, where the Rx Alpha Rolloff (α) is fixed at 35%.
To set Rx Spectrum Inversion, use the the ◄ ► arrow keys to move to the Spectrum Invert
operation on the bottom line, then set operation as On or Off using the
Once the Alpha Rolloff and Rx Spectrum Inversion settings are made, press ENTER.
5.4.2.2 (CONFIG:) Rx
Rx-IF Frequency:
To edit the Rx-If Frequency, select each digit to be edited using the ◄ ► arrow keys, then edit the
value of that digit using the
The available frequency ranges are 0050.0000 to 0180.0000 (50-180) MHz, and 0950.0000 to
2150.0000 (950-2150) MHz (L-Band). The resolution is 100Hz.
5.4.2.3 (CONFIG:) Rx
Rx FEC: LDPC+BCH
This is a 'status only' message. The CDM-740 features LDPC+BCH (Low-Density Parity Check
+ Bose, Chaudhuri, and Hocquengham) FEC as its sole available Rx FEC type.
Demod Data Descram Pilot
IF
(.20,.25,.35)
Freq (Frequency)
0050.0000 MHz
arrow keys. Press ENTER when done.
▲ ▼
FEC
5–9
Revision 0
MN-CDM740
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arrow keys. The default
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arrow keys.
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( E)