Paradise Datacom RA 5785, Руководство по эксплуатации

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Operations Manual, HPA3, Mini Compact Outdoor SSPA 208143 REV - 43
4.2 Theory of Operation
The low gain block up converter has 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 converter utilizes single up conversion from L-Band to the desired RF band. The local
oscillator 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 4-2 .
Band selectivity is accomplished using the most aggressive filtering possible while maintain-
ing specified power and spurious performance.
4.3 Smart Reference Technology
Paradise Datacom’s converters come standard with smart reference technology. Smart
reference technology allows the system operator to change external system reference
frequency without any system configuration required. The converter will automatically sense
and lock to any one of the following system reference frequencies: 10 and 50 MHz. With the
internal reference option installed the converter will operate with no external reference
applied. In the event the system operator wishes to operate on external reference, the
converter will automatically sense the presence of an external reference and switch to
external reference mode. This setting is configurable in the monitor and control software. See
Section 3.3.2
for details.
External reference is applied to the converter via the L-Band input IFL and is routed to the
frequency synthesizer using the built-in demux circuitry.
Table 4-2: BUC 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