A. frequency translations, Ku-band frequency translations – Comtech EF Data MIDAS Version 4.X Basic Configuration User Manual
Page 143
MIDAS 4.2 Basic Configuration, Rev. 1
Maintenance Menu
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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).
MULTIMEDIA INTEGRATED DIGITAL ACCESS SYSTEM