Comtech-ef-data MIDAS Version 4.X Basic Configuration Manuel d'utilisateur télécharger pdf (Page 154)

MIDAS 4.2 Basic Configuration, Rev. 1

A–12 Maintenance Menu

Bandwidth is 1.2 MHz and 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 formulas:

Transponder RX Center – RX Center = Offset below Transponder RX Center

RX Center – transponder RX Center = Offset above Transponder RX Center

Since 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 Cen-

ter IF Frequency:

70 MHz + 8.5 MHz = 78.5 MHz

Bandwidth = 1.2 MHz , the beginning and end of your space segment is found

by the following formula:

RX IF Center – 1/2 bandwidth = Space Segment Beginning IF

RX IF Center + 1/2 MHz = Space Segment Ending IF

78.5 MHz – 0.6 MHz = 77.9 MHz

78.5 MHz + 0.6 MHz = 79.1 MHz

1. Select Space Segment, view IF.

2. Right click on any area (yellow area) in Free Space.

3. Select Add Bandwidth.

4. Select IF.

5. Add Start 77.900000 and End 79.100000.

6. Close Space Segment window.

7. Observe Close Channel window is displayed.

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Comtech-ef-data MIDAS Version 4.X Basic Configuration Manuel d'utilisateur Page 154