Comtech EF Data SNM-1001L - Manual (Page 133)

SNM-1001L Satellite Modem Revision 1
Front Panel Operation MN/SNM1001L.IOM
4–69
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