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Operations Manual, HPA2, Compact Outdoor SSPA 205486 REV F 83
9.2 ZBUC Theory of Operation
The ZBUC is a low gain block up converter with a P
1dB
of 0dBm. This topology allows the
system to be integrated with little impact on the general electrical specifications of the SSPA
module.
The ZBUC utilizes single up conversion from L-Band to the desired RF band. The local oscil-
lator circuits are designed to maintain the lowest possible output phase noise. The frequency
synthesizer utilizes industry leading technology which allows for phase noise performance
previously unattainable in PLL design. Typical phase noise specifications are outlined in
Table 9-2.
Band selectivity is accomplished using the most aggressive filtering possible while maintain-
ing specified power and spurious performance.
9.3 Smart Reference Technology
Paradise Datacom’s new ZBUC comes standard with smart reference technology. Smart
reference technology allows the system operator to change external system reference
frequency without any system configuration required. The ZBUC will automatically sense and
lock to any one of the following system reference frequencies: 5, 10, 20, 25, and 50 MHz.
With the internal reference option installed the ZBUC will operate with no external reference
applied. In the event the system operator wishes to operate on external reference, the ZBUC
will automatically sense the presence of an external reference and switch to external
reference mode. With the internal reference option installed, the internal reference also
becomes a backup reference which will become active in the event that external system
reference is lost.
External reference is applied to the ZBUC via the L-Band input IFL and is routed to the
frequency synthesizer using the built-in demux circuitry.
Table 9-2: ZBUC RF output phase noise specification
Offset
Guaranteed
Maximum
C-Band
(Typical)
X-Band
(Typical)
Units
10 Hz -30 -60 -60 -50 dBc/Hz
100 Hz -60 -80 -75 -65 dBc/Hz
1 KHz -70 -80 -75 -72 dBc/Hz
10 KHz -80 -85 -100 -90 dBc/Hz
100 KHz -90 -120 -110 -110 dBc/Hz
1 MHz -90 -125 -122 -120 dBc/Hz
Ku-Band
(Typical)
Ka-Band
(Typical)
-60
-72
-75
-88
-112
-122