Comtech EF Data MIDAS Version 4.X NMS Configuration - Manual (Page 145)

MIDAS 4.X NMS Configuration, Rev. 6
Frequency Translation A-13
Space Segment
Setup
Ensure 1.2 MHz of bandwidth and the C-Band RX center frequency is 3.7285 GHz, de-
fine the beginning and end of the space segment in IF by determining where it lies on the
transponder with the following formula:
Transponder RX Center – RX Center = Offset below Transponder RX Center
or
RX Center - Transponder RX Center = Offset above Transponder RX Center
Ensure RX Center is above the Transponder Center it would be:
3.7285 GHz – 3.720 GHz = 8.5 MHz above Transponder Center
Add (or subtract) this offset from the IF Center (70 MHz) to find the RX Center IF
frequency:
70 MHz + 8.5 MHz = 78.5 MHz
Ensure 1.2 MHz of bandwidth, the beginning and end of your space segment is determined
by the following formula:
RX IF Center – 1/2 bandwidth = Space Segment Beginning IF
(78.5 MHz – 0.6 MHz = 77.9 MHz)
RX IF Center + 1/2 bandwidth = Space Segment Ending
(78.5 MHz + 0.6 MHz = 79.1 MHz)
Select Space Segment, view IF. Right click on any area in Free Space (YELLOW), and
select Add Bandwidth. Select IF, and Add Start 77.900000 and End 79.100000. Close
Space Segment window and the Control Channel window will appear.