System Components | 2-18
The signal is then routed through an isolator to the solid-state power amplifier (SSPA).
Some models have an additional mechanical filter between the isolator and the SSPA.
The SSPA amplifies the signal which is then routed to the output through an isolator
for reverse power protection. The RF output is detected for M&C purposes. The IBUC
gain has been calibrated so that at minimum attenuation, a -30 dBm input results in
rated power of at least P1dB at the output at any frequency or temperature, for GaAs
units. For GaN units the IBUC gain has been calibrated so that at minimum
attenuation, the small signal gain is, at a minimum, (P
SAT
+31)dB.
To operate at lower power levels, reduce the input to the IBUC or reduce the IBUC
gain by using the variable attenuator, accessible using any of the M&C interfaces. The
output of a C-band IBUC is a CPR137G waveguide or an N-type connector, the output
of an X-band is a CPR112G waveguide, the output of a Ku-band IBUC is a WR75
cover with groove waveguide, and the output of a Ka-band IBUC is a WR28 UG cover
with groove waveguide.
Figure 2.6 depicts the signal flow for units that are DC powered, Figure 2.7 depicts the
signal flow for units that are AC powered, and Figure 2.8 depicts the signal flow for
DC-powered low energy-consumption units.
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