5401 Airborne Disciplined Rubidium Oscillator
5402 Disciplined Rubidium Oscillator
Operating Manual
Preliminary Rev. A, May 2005
PN 8500-0150
Symmetricom, Inc.
2300 Orchard Parkway
San Jose, CA 95131-1017
U.S.A.
http://www.symmetricom.com
Copyright © 1999–2005 Symmetricom, Inc.
All rights reserved. Printed in U.S.A.
This manual is provided to assist the user in the opera tion and maintenance of the supplied equip ment
or software. It is recognized that multiple copies may be required to support even a single unit, and for
this reason, permission is hereby granted to reproduce the supplied manual for the purpose stated
above, provided that this notice is included as part of the copy. Additional copies are also available
from Symmetricom for a nominal fee.
In no case, however , does the supply of this manual or the gra nting of rights to reproduce the manual,
grant any rights to use information contained within to reproduce the supplied equipment or software,
either in whole or in part.
The equipment or software described in this manual have been developed solely at the expense of
Symmetricom and are proprietary. No unlimited rights in technical data are granted. Limited rights as
per DFARS 252.227-7013 shall be effective for 10 years from the copyright date.
All product names, service marks, trademarks, and registered trademarks
used in this document are the property of their respective owners.
Operating Manual
Preface
Preface
Limited Warranty
Each new product manufactured by Symmetricom is warranted for defects in material or
workmanship for a period of one year from date of shipment (“Limited Warranty”). Defects in
material or workmanship found within that period will be replaced or repaired, at
Symmetricom’s option, without charge for material or labor, provided the customer returns the
equipment, freight prepaid, to the Symmetricom factory under this limited warranty.
Symmetricom will return the repaired equipment, freight prepaid, to the customer’s facility.
This one year Limited Warranty does not apply to any software or to any product not
manufactured by Symmetricom.
If on-site warranty repair or replacement is required, the customer will be charged the then
current field service rate for portal-to-portal travel time plus actual portal-to-portal travel
charges. There is no charge for on-site warranty repair labor.
Products not manufactured by Symmetricom, but included as integral part of a system (e.g.,
peripherals, options), are warranted for 90 days, or longer as provided by the original
equipment manufacturer, from date of shipment.
Aside from the Limited Warranty set forth above, Symmetricom makes no other warranties,
express or implied, of merchantability, fitness for purpose or of any other kind or description
whatsoever.
By purchasing any product manufactured by Symmetricom, the buyer consents to and
agrees with Symmetricom that as a result of the exclusion of all warranties, expressed or
implied, of merchantability, fitness for purpose, or otherwise, except for the limited one-year
warranty for defects in material and workmanship for products manufactured by
Symmetricom, that the Buyer has the sole responsibility to assess and bear all losses relating
to (1) the ability of the product or products purchased to pass without objection under the
contract description among merchants and buyers in the trade; (2) the conformity of the
product or products to fair average quality within its contract descrip tion; (3) t he fitness of the
product for the ordinary purposes for which such product is used; (4) the consistency of
quality and quantity within each unit of product or products and among all units involved; (5)
the adequacy of containers, packaging and labeling of the product or products; (6) the
conformity of the product, promises or affirmations of fact (if any) made on its label or
container; and (7) the conformity of the product to standards of quality observed by other
merchants in the trade with respect to products of similar description.
PN 8500-0150, Rev. A, May 2005 iii
Operating Manual
Preface
Limitation of Liability
By purchasing any product from Symmetricom, the Buyer consents to and agrees that the
Buyer’s sole and exclusive remedy for any damages or losses incurred by the Buyer as a
result of Symmetricom’s breach of its one-year Limited Warranty for defects in materials and
workmanship or otherwise in connection with any claim respecting the product shall be
limited to the repair or replacement of the prod uct or a refund of the sale s price of the product.
In no event shall the Buyer be entitled to recover consequential damages or any other
damages of any kind or description whatsoever.
Proprietary Notice
This document, whether patentable or non-patentable subject matter, embodies proprietary
and confidential information and is the exclusive property of Symmetricom, Inc. It may not be
reproduced, used or disclosed to others for any purpose except that for which it is purch ased
or loaned.
Where to Find Answers to Product and Document Questions
For additional information about the products described in this guide, please contact your
Symmetricom representative or your local sales of fice. You can also cont act us on the web at
www.symmetricom.com.
Warnings, Cautions, Recommendations, and Notes
Warnings, Cautions, Recommendations, and Notes attract attention to essential or critical
information in this guide. The types of information included in each are explained in the
following examples.
Warning: To avoid serious personal injury or death, do not disregard warnings. All warn-
ings use this symbol. Warnings are installation, operation, or maintenance procedures,
practices, or statements, that if not strictly observed, may result in serious personal injury
or even death.
Caution: To avoid personal injury, do not disregard cautions. All cautions use this sym-
bol. Cautions are installation, operation, or maintenance procedures, practices, conditions, or statements, that if not strictly observed, may result in damage to, or destruction
of, the equipment. Cautions are also used to indicate a long-term health hazard.
PN 8500-0150, Rev. A, May 2005 iv
Operating Manual
Preface
ESD Caution: To avoid personal injury and electrostatic discharge (ESD) damage to
equipment, do not disregard ESD cautions. All ESD cautions use this symbol. ESD cautions are installation, operation, or maintenance procedures, practices, conditions, or
statements that if not strictly observed, ma y result in possible personal injury, electrostatic discharge damage to, or destruction of, static-sensitive components of the equipment.
Electrical Shock Caution: To avoid electr ical shock and possible personal injury, do not
disregard electrical shock cautions. All electrical shock cautions use this symbol. Electrical shock cautions are practices, procedures, or statements, that if not strictly observed,
may result in possible personal injury, electrical shock damage to, or destruction of components of the equipment.
Recommendation: All recommendations use this symbol. Recommendations indicate
manufacturer-tested methods or known functionality. Recommendations contain installation, operation, or maintenance procedures, practices, conditio ns, or statements, that
provide important information for optimum performance results.
Note: All notes use this symbol. Notes contain installation, operation, or maintenance
procedures, practices, conditions, or statements, that alert you to important information,
which may make your task easier or increase your understanding.
Conventions Used in This Guide
This guide uses the following conventions:
Acronyms and Abbreviations – Terms are spe lled out the first time they appear in text.
Thereafter, only the acronym or abbreviation is used.
Revision Control – The title page lists the printing date and versions of the product this
guide describes.
Table 1 Typographical Conventions – This guide uses the typographical conventions
described in Table 2.
PN 8500-0150, Rev. A, May 2005 v
Table 2 Typographical Conventions
Operating Manual
Preface
When text appears
this way...
SSU-2000 User’s Guide The title of a document.
SSU
CRITICAL
IOC1
Select File, Open... Click the Open option on the File menu.
Press Enter
Press ;
SSU
Username:
PING
STATUS
A re-timing application A word or term being emphasized.
Symmetricom does not recom-
mend...
... it means:
An operating mode, alarm state, status, or chassis label.
A named keyboard key.
The key name is shown as it appears on the keyboard. An
explanation of the key’s acronym or function immediately follows the first reference to the key, if required.
Text in a source file or a system prompt or other text that
appears on a screen.
A command you enter at a system prompt or text you enter in
response to a program prompt. You must enter commands for
case-sensitive operating systems exactly as shown.
A word or term given special emphasis.
PN 8500-0150, Rev. A, May 2005 vi
Operating Manual
Preface
Limited Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Limitation of Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
Proprietary Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
Where to Find Answers to Product and Document Questions . . . . . . . . . . . . . iv
Warnings, Cautions, Recommendations, and Notes . . . . . . . . . . . . . . . . . . . . iv
Conventions Used in This Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .v
1 — Introductio n
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Symmetricom 5401 Airborne Disciplined Rubidium Oscillator . . . . . . . . . .2
Symmetricom 5402 Disciplined Rubidium Oscillator . . . . . . . . . . . . . . . . .2
2 —Installation
Contents
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Unpacking and Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Symmetricom 5401 Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Symmetricom 5401 Initial Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Symmetricom 5401 Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Symmetricom 5402 Rack Mounting Procedure. . . . . . . . . . . . . . . . . . . . . . . . . .5
Symmetricom 5402 Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Symmetricom 5402 Initial Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Symmetricom 5402 Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 —Operation
RS-232 Input/Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Status Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Discipline Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Discipline On. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Dynamic Gain Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Enter KM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Enter KO1, KO2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Enter Disgain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Enter Resync Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Enter Resync Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Enter Rate Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
PN 8500-0150, Rev. A, May 2005 Contents-1
Operating Manual
Burst Status On. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Burst Status Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Request TI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Enter DAC Value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Request Firmware Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Enter Start-up Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Request Start-up Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Calibrate Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Set Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Enter 1 PPS Offset (not implemented) . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Request Setup Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Input Threshold High/Low. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Enter Programmable Delay Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Enter Oscillator Control Range (not implemented). . . . . . . . . . . . . . . . . .22
Design Verify On/Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Cal Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Enter Estimation Filter Time Constant . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Enter Dynamic Gain Factors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
4 —Specifications
Input Specifications and Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Output Specifications and Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
5401 Indicators (Front Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
5402 Indicators (Front Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
DRO Internal Time Bases. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10 MHz Oven Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
5401 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
5401 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
5402 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
5402 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
PN 8500-0150, Rev. A, May 2005 Contents-2
Operating Manual
Introduction
1 — Introduction
Product Overview
The purpose of the Symmetricom 5401 Airborne Disciplined Rubidium and 5402 Disciplined
Rubidium Oscillator (DRO) is to provide a precise time and frequency reference for other
equipment. The DRO will base this reference on a precise 1 PPS input, typically from a GPS
Receiver. At the 1 PPS time signal input rollover, the DRO will measure the time difference
between it and the internal Rubidium oscillator. It will continuously correct the oscillator error,
smooth the GPS Receiver noise due to ephemeris and time switching errors, and provide
smoothed, coherent 1 PPS time reference and a 10 MHz frequency reference signal outputs.
The DRO contains a Low Profile Rubidium Oscillator (LPRO) that is controlled by a High
Resolution Disciplining assembly along with the necessary Power Supply, Buffers and
Distribution Amplifiers.
The High Resolution Disciplining assembly contains the logic to discipline the Rubidium
oscillator to an external 1 PPS input. This assembly also contains a 10 MHz oven oscillator
that is phase locked to the Rubidium. This provides a source for low noise 10 MHz sine wave
outputs.
Two 3 Channel Distribution Amplifiers are provided to output six (6) 10 MHz sine wave
outputs. A 1 PPS Buffer generates six (6) 1 PPS outputs.
The DRO also has an RS232 I/O port that is used for setup, control, and to output the unit's
status.
Except for the power supplies, the 5401 and 5402 are electrically identical. The power and
serial RS-232 connectors are different as are the signal input and outpu t connectors. Refer to
Figure 1 and Figure 2 for illustrations of the two configurations of the DRO. Details are given
in Chapter 4.
In this Operating Manual, the term "DRO" is used when the information applies equally to
both the Symmetricom 5401 and the Symmetricom 5402.
PN 8500-0150, Rev. A, May 2005 1
Operating Manual
Introduction
Symmetricom 5401 Airborne Disciplined Rubidium Oscillator
The Symmetricom 5401 is built in an airborne package that is powered by standard aircraft
power (+28 VDC) and is installed by mounting the chassis on a flat base plate. Refer to
Chapter 4 for complete specifications.
Figure 1 Symmetricom 5401 3-View
Symmetricom 5402 Disciplined Rubidium Oscillator
The Symmetricom 5402 is built in a standard rack mount configuration that is powered by
commercial power anywhere in the world (85 to 264 VAC). The unit is designed to be
installed in a standard 19-inch RETMA electronic enclosure. Chassis slides are
recommended for support.
Figure 2 Symmetricom 5402 2-View
PN 8500-0150, Rev. A, May 2005 2
Operating Manual
Installation
2 — Installation
Installation
This section describes the unpacking, inspection, installation, and operation of the
Symmetricom 5401 and 5402 Disciplined Rubidium Oscillators.
Unpacking and Inspection
The DRO is packaged in one shipping container. Inspect the unit for visible damage
(scratches, dents, etc.). If the instrument is damaged, immediately notify both Symmetricom
and the responsible carrier. Keep th e shipping container and p acking material for the carrier's
inspection.
Note: When communicating with either Symmetricom or the responsible carrier
regarding shipping damage, refer to the serial number. This number is located
on the front panel of the 5401 and the rear panel of the 5402.
Symmetricom 5401 Installation Procedure
1. Install the unit in the desired location and connect the unit to its power source. Refer to
Chapter 4 for specifications and connector pin assignments.
2. Connect the 1 PPS input to its 1 PPS source and connect the 1 PPS and 10 MHz outputs
to their desired destinations.
Connection to the RS-232 I/O is not necessary for operation, but it is desirable in order to
monitor status or enter new control parameters.
Symmetricom 5401 Initial Operation
Upon completion of the installation:
1. Apply power to the unit and observe that the green POWER LED indicator illuminates.
Note that this unit does NOT contain a power switch.
2. After approximately five minutes, the yellow LOCK LED indicator will illuminate indicating
that the internal Rubidium oscillator has attained lock (resonance). The 10 MHz outputs
are now stable for use. Disciplining of the Rubidium oscillator will begin once a 1 PPS
input is present.
PN 8500-0150, Rev. A, May 2005 3
Operating Manual
Installation
The 5401 is now operational and will begin to discipline the Rubidium using the control
parameters that were previously stored in battery-backed RAM when the unit was last
powered-down.
Symmetricom 5401 Adjustments
The amplitude of each of the 10 MHz outputs can be individually adjusted with
potentiometers located on the 3-Channel Distribution Amplifier (Assembly 35039).
In order to gain access to these adjustments, do the following: (The 5401 is viewed from the
rear.)
1. Remove the screws that secure the left side panel to the unit. Remove the side panel.
2. Remove the screws that secure the back panel to the unit, including the capacitor
bracket.
The two Distribution Amplifiers (Assembly 35039) are located one on top of the other, as
shown in Figure 3 below.
On the top amplifier, R1 adjusts the output on front panel SMA J7.
On the top amplifier, R18 adjusts the output on front panel SMA J8.
On the top amplifier, R22 adjusts the output on front panel SMA J9.
On the bottom amplifier, R1 adjusts the output on front panel SMA J10.
On the bottom amplifier, R18 adjusts the output on front panel SMA J11.
On the bottom amplifier, R22 adjusts the output on front panel SMA J12.
Figure 3 5401 Adjustment Locations
PN 8500-0150, Rev. A, May 2005 4
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