Comtech EF Data CDM-740 - Manual (Page 81)

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 frequency +/- 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).