XLi Time & Frequency System 177
XLi-man, Issue 8, 6/17/2008, Rev. H
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Low Phase Noise 10 MHz Output (87-8009-10)
Introduction
This Low Phase Noise (LPN) output module provides four 10 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.
1, 5, 10 MHz Sine/MPPS Square Output (86-8008)
Introduction
The 1, 5, 10 MHz/MPPS card generates four stable-frequency sine or square wave outputs through its
four BNC connectors. These outputs are phased-locked to the XLi’s disciplined internal oscillator or
external frequency reference source (See “F113 – J3 Input (Aux Ref, Freq Meas)” on page 146
). The
card’s output frequencies are set by manually configuring jumpers on the output card. Once configured,
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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