Example of ku- band carrier – Comtech EF Data MIDAS Version 4.X Basic Configuration User Manual
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MIDAS 4.2 Basic Configuration, Rev. 1
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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.
S
S
y
y
s
s
t
t
e
e
m
m
S
S
e
e
t
t
u
u
p
p
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: