Teledyne 7 RU Chassis, Руководство по эксплуатации, Страница: 82 / 144

82 208528 REV M Operations Manual, 7RU SSPA Chassis
5.3 Smart Reference Technology
Teledyne Paradise Datacom’s new zBUC converter 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 converter
will automatically sense and lock to any one of the following system reference frequencies:
10, 20, 25, and 50 MHz. With the internal reference option installed, the zBUC converter will
operate with no external reference applied. In the event the system operator wishes to
operate on external reference, the zBUC converter 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 converter via the L-Band input IFL and is routed to
the frequency synthesizer using the built-in demux circuitry.
Note: The external reference option requires the system operator to provide
system reference to the zBUC/SSPB. The system will not lock and will have no
output without external reference applied.
Note: Internal reference option allows for either internal or external reference
operation.
A zBUC converter with an internal 10 MHz crystal reference has the following specifications:
Frequency Stability:
≤ ± 3 • 10
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over the temperature range –20 to +85 °C
≤ ± 1 • 10
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aging per day (after 30 days)
≤ ± 6 • 10
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aging per year (after 30 days)
Warm up time: 20 minutes for better than ≤ ± 1 • 10
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Phase Noise: 10 Hz -120 dBc/Hz
100 Hz -140 dBc/Hz
1 KHz -145 dBc/Hz
10 KHz -152 dBc/Hz
100 KHz -155 dBc/Hz
Frequency Accuracy: Factory preset to ≤ ± 3 • 10
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