Teledyne 6 RU Chassis, Operation Manual

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108 202058 REV AA 6 RU SSPA Chassis Operations Manual
8.3 Smart Reference Technology
Teledyne Paradise Datacom’s zBUC converter comes standard with smart reference
technology. Smart reference technology allows the system operator to change exter-
nal system reference frequency without any system configuration required. The zBUC
converter will automatically sense and lock to any one of the following system refer-
ence 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 auto-
matically 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 refer-
ence 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 1
: 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 2
: Internal reference option allows for either internal or external ref-
erence operation.
The 10 MHz crystal reference used in the internal reference option of the zBUC
converter has the following specifications:
Frequency Stability:
≤ ± 1 • 10
-8
over the temperature range -40 to +90 °C
≤ ± 1 • 10
-9
aging per day
≤ ± 5 • 10
-8
aging per year
Warm up time: 5 minutes @ 25 °C for better than ≤ ± 1 • 10
-7
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