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4.1 G
ENERAL
The Low Noise Block (LNB) amplifies the input RF signal and down converts it to L-Band in
the range of 950 to 1750 MHz (there may be instances that the L-Band range = 950 to 1450
MHz). The choice of which downlink frequency band is determined by the selection of a
frequency range, usually from one of LNBs in the following bands:
LNBs are available that are either externally reference (EXT REF) or internally referenced
(INT REF).
•
The EXT REF LNB accepts an external 10 MHz reference from the IDU. These units
have the best phase noise performance and the lowest frequency drift.
•
The INT REF LNB includes its own internal oscillator. DC power is supplied to the
LNB through the IFL cable from the IDU.
The standard LNB noise temperature is: For C-Band < 35°K
Optional: A TX Reject Filter (TRF) may be obtained with the system or supplied by the
customer.
Chapter 4. LOW NOISE BLOCK
For C-Band, GHz
3.625 to 4.2
4.50 to 4.80
For Ku-Band, GHz
10.95 to 11.70
11.70 to 12.20
12.25 to 12.75
For Ku-Band < 65°K
4–1
ASSEMBLY
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