Comtech-ef-data MIDAS Version 4.X Basic Configuration Uživatelský manuál stáhnout pdf (Strana 152)

MIDAS 4.2 Basic Configuration, Rev. 1

A–10 Maintenance Menu

The relationship between Ku-Band and L-Band frequencies is:

Downlink Factor – Transponder RX Center = L-Band

[5.150 GHz – 3.720 GHz = 1430 MHz]

In order to convert an IF frequency to L-Band, the conversion factor is:

Conversion Factor = Downlink Factor – Transponder RX Center + IF

Conversion Factor = 5150 MHz – 3720 MHz + 70 MHz

Conversion Factor = 1500 MHz

To convert from L-Band to IF, the formula is :

IF Frequency = Conversion Factor – L–Band

IF Frequency = 1500 MHz – 1430 MHz

IF Frequency = 70 MHz

Example of Ku-

Band Carrier

The translation formulas show the RX center frequencies of a 36 MHz trans-

ponder at C-Band, L-Band, and IF. This establishes the reference points need

when determining how to set up the MIDAS System to manage the bandwidth

that occupies a portion of a transponder.

Example: 1.2 MHz (on the transponder) the C-Band RX Center fre-

quency is 3.7285 GHz (± 0.6 MHz).

This example uses a 5.150 GHz Ku-Band to L-Band LO (Low-Side Injection),

1.4 x symbol rate carrier spacing, and a 70 MHz IF. The System Setup screen

would be configured as follows:

1 2 ... 147 148 149 150 151 152 153 154 155 156 157 ... 163 164

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Comtech-ef-data MIDAS Version 4.X Basic Configuration Uživatelský manuál Strana 152