Rf Inputs/Outputs; Rf Output; Reference Inputs/Outputs; 10/100Mhz External Reference - Holzworth Instrumentation HS9000B Series User Manual

9.0 RF INPUTS/OUTPUTS

The HS9000B Series Multi-Channel RF Synthesizers are CW work horses. They are designed to
do an excellent job of providing highly stable, phase coherent signals with pure spectrums and
highly accurate output power amplitude control.
9.1 RF OUTPUTS
The RF Output ports are labeled and positioned sequentially from left to right on the front panel of
the instrument. The RF Output ports are protected against reflected power with a maximum
damage threshold of 25V

9.2 REFERENCE INPUTS/OUTPUTS

The reference input and output ports are located on
the right side of the rear panel.
NOTE that the internal reference distribution
subsystem must be manually set for the type of
reference being used
10/100MHz, or OPT-REFX frequency). The factory
default setting is for the internal reference (free
running).

9.2.1 10/100MHz External Reference

When a 10MHz or 100MHz External Reference signal is applied and External 10MHz or External
100MHz is selected in software, the system enables a 20Hz digital PLL which phase locks the
internal OCXO to the external reference signal. The internal OCXO remains operating in both
scenarios to maintain optimal phase noise levels at >20Hz offset. The performance of the
synthesized channel output signals as well as the fixed 10MHz and 100MHz Reference Output
signals are based on the 10 or 100MHz external reference for offsets of <20Hz; performance is
based on the integrity of the 100MHz internal OCXO at offsets of >20Hz.
This architecture is often used in laboratories and systems as a cleanup loop for 10MHz Rubidium,
Cesium, GPS disciplined, etc. references; as it provides an optimal reference signal for the internal
channels as well as both the 10MHz and 100MHz reference outputs.

9.2.2 Reference Output Summary

Holzworth multi-channel synthesizer modules supply very clean 10MHz and 100MHz Reference
Outputs under all operating conditions.
An outline of the reference input vs. output configuration is captured as follows:
Reference Input
None (free running)
10MHz Signal applied
100MHz Signal applied
HS9000B Series Manual 1.04
(+10dBm or 10mW).
DC
(internal, external
Internal
100MHz 100MHz Reference Out
OCXO
ACTIVE Matches Internal 100MHz OCXO
Based on:
ACTIVE Internal 100MHz OCXO (>20Hz OS)
External 10MHz (<20Hz OS)
Based on:
ACTIVE Internal 100MHz OCXO (>20Hz OS)
External 100MHz (<20Hz OS)
www.holzworth.com
10MHz Reference Out
Divided from internal 100MHz OCXO.
Divided from:
Internal 100MHz OCXO (>20Hz OS)
External 10MHz (<20Hz OS)
Divided from:
Internal 100MHz OCXO (>20Hz OS)
External 100MHz (<20Hz OS)
Page 28 of 65