Comtech EF Data MIDAS Version 4.X Basic Configuration User Manual
Page 149
MIDAS 4.2 Basic Configuration Rev. 1
Maintenance Menu
A–7
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Note: Normally, there is no frequency inversion between the IF (70 MHz) and the RF
(C-Band or Ku-Band). If there were a frequency inversion between IF and Ku-Band,
the IF to Ku-Band conversion is altered slightly.
The IF frequency is subtracted rather than added. In the example of a Ku-Band
frequency of 11.72825 GHz, the IF frequency would be 61.75 MHz, 8.25
MHz below the IF center of 70 MHz.
RF = Transponder RX Center + 70 MHz – IF
RF = 11720 + 70 – 61.75 = 11728.25 MHz
Also, in this case, the IF to L-Band formula changes, and the conversion factor
is:
Conversion Factor = Transponder RX Center – 10750 MHz + 70 MHz
Conversion Factor = 11720 MHz – 10750 MHz + 70 MHz
Conversion Factor = 1040 MHz
The usage of the conversion factor is:
L-Band = Conversion Factor – IF Frequency
or
IF = Conversion Factor – L-Band