Teledyne HPAC-2005, Operation Manual

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98 205356 REV T 3 RU SSPA Chassis Operations Manual
6.3 Smart Reference Technology
Teledyne Paradise Datacom’s zBUC block up 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 a 10 MHz or 50
MHz system reference frequency. With the internal reference option installed, the
zBUC converter will operate with no external reference applied. In the event the sys-
tem operator wishes to operate on external reference, the 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 pro-
vide 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 refer-
ence operation.
6.3.1 Specifications of Internal Crystal Reference
The 10 MHz crystal reference used in the internal reference option of the zBUC
converter 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 @ 25 °C 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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