SDM-300L3 Satellite Modem
Revision 1
Front Panel Operation
MN/SDM300L3.IOM
4–95
FUNCTION
SELECT:UTILITY:
DEMODULATOR:
RX
TERMINAL
LO
RX TERMINAL LO
O MHz
MIX: -
Valid selections entered into this menu make it possible to directly program the
frequency received by the satellite terminal using the
Configuration: Demodulator:
Terminal Frequency
menu. The combination of the LO and MIX determine the terminal
frequency displayed. (When the terminal frequency mode is active, the actual RX L-Band
frequency is displayed under the
Function Select: Monitor
menu.)
Utility Modulator RX Terminal LO Menu
LO
MIX
Configuration: Demodulator Menu (Effect on)
0
+ or -
The RX IF Frequency menu appears and the modem is programmed
over the
L-Band range of frequencies.
3000 - 65000
+
The RX Terminal Frequency menu appears and the modem is
programmed:
TX Terminal Frequency = LO + L-Band Frequency
3000 - 65000
-
The RX Terminal Frequency menu appears and the modem is
programmed :
RX Terminal Frequency = LO – L-Band Frequency
The sign of the Mix, + or -, is determined as follows:
Mix = “+” when LO < terminal (satellite) operating frequency of the LNB.
Mix = “-“ when LO > terminal (satellite) operating frequency of the LNB.
Examples:
LO = 11300 MHz Mix = “+”
RX Terminal Frequency (Max) = 11300 + 1750 = 13050 MHz
RX Terminal Frequency (Min) = 11300 + 950 = 12250 MHz
LO = 5150 MHz Mix = “-“
TX Terminal Frequency (Max) = 5150 - 950 = 4200 MHz
TX Terminal Frequency (Min) = 5150 - 1750 = 3400 MHz
