Comtech EF Data CDM-570A - Manual (Page 122)

CDM-570A/570AL Satellite Modem with Optional Packet Processor MN-CDM570A
Front Panel Operation Revision 2
6–18
FEC Type Modulation Code Rate
Data Rate Range
EDMAC limited?
Lower Limit
(kbps)
Upper Limit
(Mbps)
None (Uncoded) BPSK
Uncoded 4.8 3.000 Yes – see preceding
“IMPORTANT” Note 4 QPSK/OQPSK Uncoded 9.6 5.000
6.3.2.3.5 (CONFIG: Tx) Frq (Frequency)
Tx IF Freq:1156.3456 MHz
(◄ ►,▲ ▼,ENT)
To edit, use the ◄ ► arrow keys to select a digit, and then use the ▲▼arrow keys to change that
digit. Press ENTER.
For the CDM/R-570AL only: The valid range of frequencies is from 950 to 2250 MHz, in steps of
100 Hz.
If the Tx IF Frequency is set above 2000 MHz, and you then set the modem to
CDM-570 Compatible Mode, the Tx IF Frequency will be reset to 1201 MHz. Be sure
to reconfigure your Tx IF Frequency as needed.
Note that, if using the CONFIG: ODUBUC menus and you select a BUC LO frequency other
than zero, and you define whether the mix is high-side or low-side, then the display changes to
include the calculated Transmit RF frequency of the modem/BUC combination. Also, note that
as you edit the Tx IF frequency, the RF frequency updates automatically:
Tx IF Freq:1156.3456 MHz
RF=14156.3456(◄ ►,▲ ▼,ENT)
For the CDM-570A only: The allowable range of frequencies is from 50 to 90 MHz and from 100
to 180 MHz, in steps of 100 Hz, as this example shows (note that the modem displays leading
zeros to maintain compatibility with the L-Band firmware):
Tx IF Freq:0085.1234 MHz
(◄ ►,▲ ▼,ENT)
6.3.2.3.6 (CONFIG: Tx) On/Off
Tx Output State: Off On
Rx-Tx Inhibit(◄ ►,ENTER)
Use the ◄ ► arrow keys to select Off, On, or Rx-Tx Inhibit. Press ENTER.
(CONFIG:Tx) Off/On Rx-Tx Inhibit
RTI-Timeout Value: 10s
7s 4s 2s 1s (◄ ►,ENTER)