176 XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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1
Low Phase Noise 5 MHz Output (87-8009-5)
Introduction
This Low Phase Noise (LPN) output module provides four 5 MHz output signals with high spectral purity
and port-to-port isolation. Each LPN module has an on-board LPN oscillator that is phase locked to the
XLi's internal oscillator. Therefore, the LPN outputs have the same accuracy and long term stability as
the XLi's internal oscillator. This option requires an XLi with an upgraded oscillator (OCXO, High Stability
OCXO, Rubidium, or High Stability Rubidium).
This option can be added to the XLi in a “Plug-and-Play” manner, and operates without hardware or
software configuration.
The PLL status of all three Low Phase Noise option cards is given by the F73 Low Phase Noise PLL
indicator. See “F73 – Alarm Control / Status”, page 94
.
Specifications
This option provides four 10 MHz frequency output signals.
Signal Type Analog sine wave
Synchronization Phase locked to the XLi's internal 10 MHz oscillator
Amplitude +13 dBm (±1 dBm)
Output Impedance 50 Ω
Quantity 4
Connector Female BNC
Harmonic distortion -30 dBc
Spurious -90 dBc (10 Hz - 10 kHz SSB)
Isolation -70 dBc
Phase Noise -85 dBc/Hz @ 1 Hz offset
-115 dBc/Hz @ 10 Hz offset
-140 dBc/Hz @ 100 Hz offset
-145 dBc/Hz @ 1 kHz offset
-150 dBc/Hz @ 10 kHz offset
CPU-Aware No
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