Terrasat Rx 1+1, Operation Manual

Page: 23 / 174

System Components
|
2-3
Figure 2.2
LNB Block Diagram of System With an Externally Referenced 10 MHz Signal
Input types to the LNB are listed in Table 2.1
Input to the LNB is typically between -125 dBm to -80 dBm depending on the system
design (including such variables as antenna size, satellite operator, number of carriers,
etc.). The LNB amplifies the RF input signal and downconverts it to an L-band signal.
The dielectric resonator oscillator (DRO) is phase locked to the 10 MHz signal that
has been multiplexed onto the L-band output connector. Typically, the 10 MHz input
level is between 0 dBm to -10 dBm and meets minimum phase noise requirements.
DC voltage is also multiplexed onto the L-band output connector and is typically
between 15 VDC to 24 VDC. Current consumption is typically less than 400 mA.
RF
I
nput
De-M
ux
LNA
IF

Amplifier
PLDRO
Power
Supply
All
Circuits
VDC
10 MHz
L-band
L-band

10 MHz
(externally
referenced)

VDC
Table 2.1
LNB Input Types
Signal Waveguide Type
C-band WR229
X-band WR112
Ku-band WR75
Ka-band WR42