Comtech EF Data MIDAS Version 4.X Basic Configuration User Manual
Page 156
MIDAS 4.2 Basic Configuration, Rev. 1
A–14 Maintenance
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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 C-Band, the
IF to C-Band conversion is altered slightly.
The IF frequency is subtracted rather than added. In the example of a C-Band
frequency of 3.7285 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 = 3720 + 70 – 61.75 = 3728.5 MHz
Also, in this case, the IF to L-Band formula changes, and the conversion factor
is:
Conversion Factor = 5150 MHz - Transponder RX Center – 70 MHz
Conversion Factor = 5150 MHz – 3720 MHz - 70 MHz
Conversion Factor = 1360 MHz
The usage of the conversion factor is:
L-Band = Conversion Factor – IF Frequency
or
IF = L-Band – Conversion Factor