Comtech EF Data CDM-740, Installation And Operation Manual

Page: 81 / 150

CDM-740 Advanced Satellite Modem Revision 0
Front Panel Operation MN-CDM740
5–29
•
[–] indicates a low side, non-inverting mix.
Note:
Satellite frequency = LO fre/- modem frequency .
To set the sign for the Terminal Mix, use the ◄ ► arrow keys to navigate to the setting, then use
the
▲ ▼
arrow keys to edit the Terminal Mix setting as positive [+] or negative [–].
Note:
The RTF: (Receive Terminal Frequency) value is provided on a ‘
status only
’ basis.
5.9.1.6 ODU: (LNB) 22K-Tone
Rx LNB 22KHz Tone: Off On
(
◄►
E
)
Select the LNB 22KHz Tone as
Off
or
On
using the
◄ ►
arrow keys, then press
ENTER
.
5.9.1.7 ODU: (LNB) Polarity
Rx Polarity: Off Horizontal Vertical
(
◄►
E
)
Select the Rx Polarity as
Off
,
Horizontal
, or
Vertical
using the
◄ ►
arrow keys, then press
ENTER
. Note the following:
•
Horizontal
corresponds to 18 volts (or LHCP);
•
Vertical
corresponds to 13 volts (or RHCP).