Comtech EF Data CDM-760, Installation And Operation Manual

Page: 104 / 441

Front Panel Operation Revision 4
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
6–15
6.2.2.2.3 (CONFIG: Tx) Freq (Frequency)
Freq:1200.0000 MHz Spectrum:Normal
Txα:.20 GoldCode:000000 (

)
Use the   arrow keys to select a parameter. Press
ENTER
.
(CONFIG: Tx) Freq

Freq
Use the
 
arrow keys to select a digit, and then use the

arrow keys to change that digit.
Press ENTER .
(CONFIG: Tx) Freq

Spectrum
Use the

arrow keys to select Inverted or Normal . Press ENTER .
The modem itself determines the Tx spectral inversion while in CnC mode. You
cannot change the spectral inversion selection while CnC mode is ON. The modem
rejects any attempt at changes.
(CONFIG: Tx) Freq

Txα (Tx Alpha Filter Rolloff Factor)
Use the

arrow keys to set the Tx
α
. Press ENTER . Valid settings are:
Mode
Tx α (Tx Alpha Filter Rolloff Factor) (%)
Default
DVB-S2 .20, .25, .35
.20 (20%)
DVB-S2-EB1 .05, .10, .15, .20, .25, .35
DVB-S2X .05, .10, .15, .20, .25, .35 .20 (20%)
(CONFIG) Tx: Freq

GoldCode (Gold-n Index Code)
CRITICAL!
Make sure that the Tx GoldCode value matches the Rx GoldCode value of the distant
end modem.
The GoldCode indicates the Physical Layer spreading sequence number. Use the
 
arrow keys
to select a digit, and then use the

arrow keys to change that digit. Press ENTER . Valid
settings are:
Minimum Maximum
Default
000000 262141
000000