Comtech EF Data DM240XR - Manual (Page 192)

DM240XR High-Speed Digital Modulator AutoEQ™ Interface Operation Guide
MN-DM240XR– Revision 13 D–12
order to assure proper acquisition of the downlink signal. Connect the AutoEQ™ Input (J12)
to the earth Station L-Band Downlink System. The desired downlink carrier should be
typically between the range of -45 to -20 dBm.
3. Clear the events of the modulator by scrolling to then down and over to
and press clear. Verify that the Event LED is now
off.
4. Using the Front Panel menu, scroll to “EQ CAL” and set it to “CALIBRATING”. This will
start the AutoEQ™ Calibration for the Satellite Link.
a. After each data acquisition and processing cycle the MSE display will be updated. A normal
calibration cycle will take 60 to 90 seconds, and system typically performs two or three of
these cycles.
b. During this calibration, the MSE can be monitored showing the progress of the cycle. A
value of 1 E-5 or less will reflect a success full completion of this step. Additionally, event
light will come on, and the event log will display “EQ CAL SUCCESSFUL” upon
completion of this step. When the EQ CAL is complete, the “EQ CAL” will revert to
“NORMAL” and the AutoEQ file will be named “UNTITLED”.
The AutoEQ calibration must be saved or powering down of the system will lose
the calibration.
5. To change the name of the “UNTITLED” file, using the Front Panel menu, scroll to EQ
RENAME, Press ENTER, use the Up/DN Arrows on the Keyboard to change the name, and press
ENTER to save the new name for the file.
6. Using the Front Panel menu, scroll to “SAVE EQ CAL”, and press ENTER to save the file.
D.10 Equalizer Modes
The AutoEQ feature must be enabled on the DM240XR, and section 4.2 Equalizer Calibration
must be performed prior to this section.
Disable Mode