Comtech-ef-data MIDAS Version 4.X Basic Configuration Bedienungsanleitung PDF herunterladen (Seite 143)

MIDAS 4.2 Basic Configuration, Rev. 1

Maintenance Menu A–1

The following parameters are configurable for Ku-Band:

Satellite – Downlink Factor Equivalent to LNB LO (Low Noise Block Converter Local Oscillator

frequency). Common Ku-Band LO’s include 10.0 GHz, 10.75 GHz, and

11.3 GHz.

Satellite - Translation Frequency difference between the Transponder TX Center and the

Transponder RX Center (Ku-Band Default = 2.300 GHz).

Satellite High-Side Injection High-side injection is where the LNB LO frequency is higher than the

RX RF frequency and the difference is used to convert to L-Band.

Satellite Low-Side Injection Low-side injection is where the LNB LO frequency is lower than the RX

RF frequency and the difference is used to convert to L-Band (Ku-Band

default = Off/Low-side injection).

Transponder – TX Center TX Center frequency the Ku transponder.

Transponder – RX Center RX Center frequency the Ku transponder.

Figure A-1 exhibits:

• A 36 MHz Ku-Band transponder with the default case of low-side in-

jection, which results in no frequency inversion.

• If high-side injection is specified, use the C-Band example, substitut-

ing Ku-Band frequencies in the example.

• A relationship between the downlink RF frequencies and the corre-

sponding L-Band IF frequencies for the first transponder of the satel-

lite.

Note: There is a 2 MHz guard band at the lower and upper edges of the transponder,

so the Ku- and L- Bands display 40 MHz of bandwidth (FC ± 20 MHz).

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Comtech-ef-data MIDAS Version 4.X Basic Configuration Bedienungsanleitung Seite 143