Config) Tx: Power; Config) Tx: Frame; Config) Tx: Mod (Modulation); Config) Tx: Data - Comtech EF Data CDM-750 Installation And Operation Manual

CDM-750 Advanced High-Speed Trunking Modem
Front Panel Operation

5.2.2.1.2.3 (CONFIG) Tx: Power

Output Power Level= –20.0 dBm
To configure the Tx Output Power Level: First, use the
then use the
▲ ▼
•
For Tx frequencies of 52-176 MHz, the permitted level range is 0 to –25 dBm.
•
For 950-2050 MHz (L-Band), the range is 0 to –40 dBm.
Press ENTER when done.

5.2.2.1.2.4 (CONFIG) Tx: Frame

Tx Framing: Normal
DVB-S2 Framing Mode
Use the ▲ ▼ arrow keys to select Normal or Short Block, and then press ENTER. Note the
following:
•
With the default value of Normal is selected, the standard FECFRAME = 64,800 bits is
enabled.
•
If Short Block is selected, FECFRAME = 16,200 bits is enabled.

5.2.2.1.2.5 (CONFIG) Tx: Mod (Modulation)

MODCOD=QPSK 1/2
Use the arrow keys to select the modulation and FEC type, and then press ENTER. Note the
▲ ▼
following:
•
A ModCod setting of "Auto (ACM)" is to be used when running in ACM mode. In ACM
mode, the user does not directly control the ModCod used at any given moment, but rather
the ModCod chosen for the Tx carrier is based on the rules and configuration of the ACM
parameters. See Sect. 5.2.2.1.5 for configuration of ACM parameters.
•
The upper range of modulation and coding as well as Auto (ACM) capability will be
dictated by the FAST option(s) installed.

5.2.2.1.2.6 (CONFIG) Tx: Data

Tx Data Rate
◄ ►
Use the arrow keys to select Tx Data Rate or Tx Symbol Rate, and then press ENTER.
arrow keys to edit the value of that digit. Note the following:
Tx Symbol Rate
◄ ► arrow keys to select a digit to edit, and
5–13
Revision 1
MN-CDM750
v)
(
v)
(
v)
(
( )