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the LNB contains , 1) 2 LNAs for vertical and horizontal reception
2) gain stage
3)image rejection filter
4)mixer
5)2 LO for high and low band
6) IF filter
7) IF amplifier
8) control circuitry
check this
the power combiner can be used , and the swithing action can be done with control circuit to turn on or off the LNA , or one of the upper and lower Oscillator
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