Comtech EF Data CTOG-250 - Manual (Page 129)

CTOG-250 Comtech Traffic Optimization Gateway Revision 1
Ethernet-based Remote Product Management MN-CTOG250
7–27
The CDM-840 automatically detects the roll-off, so no additional configuration is required.
• Spectrum Invert – Use the drop-down menu to select the Tx Spectrum Invert as Normal or
Tx Spectrum Inverted.
The CDM-840 automatically detects the CDM-800 Spectrum Inversion; no additional
configuration is required.
• Power Level (-40 to -5 dBm for L-Band, -25 to -5.0 for 70/140 MHz) – Enter the Tx power
level, in dBm.
• Carrier State – Use the drop-down menu to select the Tx Carrier State as either Off or On.
Select or enter the desired Tx Frequency, Tx Symbol Rate, Frame, Gold Code, Roll Off, Spectrum
Invert, and Carrier State settings. Click [Submit] to save.
Modulator Frequency
The Tx Frequency Calculator provided here conveniently allows you to start from either the Tx
RF or Tx L-Band/IF Frequency and calculate the “other” frequency. If you know the BUC LO Mix,
BUC LO Frequency, and one of the desired frequencies, then the other can be calculated.
This calculator is intended to remove any guesswork associated with the modem’s L-Band/IF
Frequency to the terminal’s RF frequency (or vise versa).
The acceptable/valid operating range for each item in this section is provided in parentheses.
• Tx RF Frequency (0 to 67150) – This the frequency at which the terminal is transmitting to
the satellite. Upon configuring this to a non-zero value, as well as entering in the BUC LO
Mix and Frequency, the modem’s Land or IF frequency will be automatically configured.
Enter the Tx RF Frequency in MHz, and then click [Submit]. Upon submission, if the BUC LO
Frequency has been entered, the resulting Tx RF Frequency will be displayed.
If the BUC LO Frequency is left at the default configuration of zero, the Tx RF Frequency will
not be calculated.
The BUC LO Mix and BUC LO Frequency entries are provided for calculation
purposes only. BUC configuration is not updated as a result of configuring these
parameters.
• BUC LO Mix – Use this drop-down menu to select the BUC LO (Low Oscillator) Mix as
Upconv (SUM): RF=LO+LBand or DownConv (Diff): RF=LO-LBand.
Consult your BUC adjunct product datasheet or its Installation and Operation
Manual for the type of BUC (Up Converter [Sum] or Down Converter [Diff])
being used.