MG-73B [DISTRIBUTION] - MERCURY UNITED ELECTRONICS

Mercury United Electronics, Inc.

10823 Edison Court

Rancho Cucamonga, California 91730 U.S.A.

TEL: (909) 466-0427, 1-888-310-8382

Fax: (909) 466-0762

e-mail: sales-us@mercury-crystal.com

www.mercury-crystal.com

GPS FREQUENCY

REFERENCE DISTRIBUTOR

MODEL: MG-73B

USE’R GUIDE

Version 1.1, October 2004

CERTIFICATION

Mercury United certifies that this instrument was thoroughly tested and inspected and

found to meet its published specifications when it was shipped from the factory.

WARRANTY AND ASSISTANCE

Products manufactured by Mercury United are warranted against defects in material and

workmanship. This warranty applies for one year from the date of shipment. OEM products

used in Mercury United systems are warranted as indicated by the respective

manufacturer. During the warranty period, Mercury United will, at its option, either repair

or replace products that prove to be defective. The repaired or replaced product will be

warranted for a period of 90 days from the date of return equipment, or for the balance of

the original warranty, whichever is longer.

To obtain repair under this warranty, the buyer must obtain a RMA (Return Authorization)

number from Mercury United and return the equipment to a designated repair location.

In the USA, all warranted shipments by UPS ground track will be paid by Mercury United.

All other shipping methods will be billed to the customer. In the case of equipment

returned from a country other than the United States of America, the buyer shall pay all

applicable duties or taxes required and freight charges both ways.

No other warranty is expressed or implied. In no event will Mercury United or any person

involved in the creation, production, or distribution of the Mercury United products be

liable for any direct, indirect, special, incidental, or consequential damages resulting from

the buyer’s use of this equipment or software supplied by Mercury United. It is the buyer’s

sole responsibility to determine the suitability of this product for the intended use prior to

purchase. Some states do not allow limitations on warranties, so some or all of the above

limitation may apply to you.

The software supplied is to be used by the purchasing customer only. Providing this

software to other potential system users will void any warranty and assistance. Software

included with this equipment is intended (but not guaranteed) to run on any Windows95®

(or higher)-based computer, and is provided solely for the convenience of the buyer. It is

supplied as-is, and is expressly excluded from any warranty.

There are no user-serviceable parts inside the system.

Remove the cover will void the warranty.

This warranty shall not apply to defects caused by improper or inadequate maintenance,

calibration, modification, repair and unauthorized alteration and unreasonable use by the

user. Also, abuse, neglect, accident, damage in shipment to Mercury United for repair and

operation outside the environmental specifications of the product are not applied. Mercury

United shall make the evaluation of the unit and shall be the sole determiner of it eligibility

for or exclusion from warranty coverage.

SAFETY SUMMARY

The following general safety precaution must be observed during all phases of operation,

service, and repair of this equipment. Failure to comply with these precautions or with

specific warnings elsewhere in this manual violates safety standards of design,

manufacture and intended use of the instrument. Mercury United assumes no liability for

the customer’s failure to comply with these requirements.

GROUNDING THE INSTRUNMENT

To minimize the shock hazard, the instrument chassis and cabinet must be connected to an

electrical ground. The power cable must be plugged into either an approved receptacle or

adaptor with the grounding wire (green or green/yellow) firmly connected to an electrical

ground (safety ground) at the power outlet.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSHPERE

Do not operate the instrument in the presence of flammable gases or fumes. Operation of

any electrical instrument in such an environment constitutes a definite safety hazard.

KEEP AWAY FROM LIVE CIRCUIT

Operating personnel must not remove instrument covers. Component replacement and

internal adjustments must be made by qualified maintenance personnel. Do not replace

components with power connected. Under certain conditions, dangerous voltages may

exist even with the power cable removed. To avoid injuries, always disconnect power and

discharge circuits before touching them.

DO NOT SERVICE OR ADJUST ALONE

Do not attempt internal service or adjustment unless another person capable of rendering

first aid and resuscitation is present.

DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT

Because of the danger of the introducing additional hazards, do not install substitute parts

or perform any unauthorized modification to the instrument. Return the instrument to

Mercury United for service and repair to ensure that safety features are maintained.

ESD STATEMENT

Electro-static discharge can damage electronic equipment. All components, system parts,

and equipment are carefully handled while at Mercury United factory. Ensure that all ESD

precautions are implemented, including but not limited to: ESD stations, ESD wrist-bands,

ESD mats, etc.

Do not operate or store near strong electrostatic, electromagnetic, magnetic or radioactive

fields.

Mercury United makes every effort to insure that the information in this document is

accurate, but makes no claim to that effect and does not guarantee accuracy. This

information is offered as-is, and Mercury United cannot be held responsible for any

inaccuracies. Specifications, features and operational characteristics of the described

product are subject to change without notice.

copied, photocopied, reproduced, translated, or reproduced to any electronic medium or

machine-readable form without prior written consent from Mercury United Electronics, Inc.

Printed in the United States of America.

WARNING

This equipment is primarily designed to provide precise time and

frequency reference at a fixed site. Although it has GPS position

location capability, using this equipment for navigation is not

recommended. The users understand that GPS receiver can be affected

by numerous sources of error such as satellite geometry, selective

availability, satellite condition, receiver location and electromagnetic

interference. Published accuracy specifications are to be used as a

guide and are not guaranteed.

All GPS receivers are subject to degradation of position and velocity

accuracies under Department of Defense imposed Selective Availability

(SIA)

TABLE OF CONTENTS

SECTION 1: PRODUCT OVERVIEW ------------------------------------------------------------ 1

1.1 The Front Panel at a Glance ------------------------------------------------- 2

1.2 The Rear Panel at a Glance -------------------------------------------------- 2

SECTION 2: UNPACKING ------------------------------------------------------------------------ 3

2.1 Packing list --------------------------------------------------------------------- 4

SECTION 3: INSTALLATION --------------------------------------------------------------------- 4

3.1 Antenna Installation ----------------------------------------------------------- 4

SECTION 4: SYSTEM EXPANSION ------------------------------------------------------------- 4

4.1 If More than 6 Frequency References Are Required----------------------- 4

SECTION 5: MAINTENACE ----------------------------------------------------------------------- 5

SECTION 6: IN CASE OF DIFFICULTY ---------------------------------------------------------- 5

6.1 Contacting Mercury United --------------------------------------------------- 5

6.2 Returning Equipment for Repair --------------------------------------------- 6

APPENDIX A – SPECIFICATIONS -------------------------------------------------------------- 6

10.0 MHz Outputs (Output Channel 1 ~ Channel 6) ---------------------- 6

Environmental Specifications ------------------------------------------------ 6

- 1 -

SECTION 1: PRODUCT OVERVIEW

Mercury MG73-B GPS Frequency Reference Distributor is primarily designed as an

expansion unit for Mercury MG73-A GPS Frequency Reference Receiver and Distributor.

MG73-A provides 6 channels of GPS disciplined 10 MHz signals only, but additional 6

channels become available when cascaded with a unit of MG73-B. All these signals have

identical traceability to the original GPS disciplined 10 MHz reference. MG73-B itself can also

be cascaded to obtain more reference signals.

Applications

►Standards Labs;

►Frequency Calibration for counters, timers and all frequency-related instrumentation.

►Telecoms synchronization and timescale correction to UTC.

- 2 -

1.1 The Rear Panel at a Glance

1.2 The Front Panel at a Glance

n: Power LED p: 10 MHz Input

o: R F Detect q: 10 MHz outputs from the frequency distributor

Ventilation grid

Input Power Entry

Module with fuse

and s

are fuse

- 3 -

SECTION 2: UNPACKING

Every system includes a packing list showing the contents of the shipment. Upon

receiving the system, the packing list should be checked to make sure that all the

items listed are present and undamaged.

Packing List for Model MG-73A

Item Description Quantity Mercury Part

Number

√

1 GPS Frequency Reference

Distribution unit

1 MG73-B

2 3 plug power cord 1 625005

3 MG73-B user’s guide 1 625106

SECTION 3: INSTALLATION

3.1 Input Signal Connection

Connect a reference signal to the input of the MG73-B is all it takes. The input

frequency is not limited to 10 MHz.

- 4 -

SECTION 4: SYSTEM EXPANSION

4.1 If More than 6 Frequency References Are Required

You can obtain more frequency references by cascading MG73-A with a MG73-B. MG73-B is

just like a MG73-A without the GPS receiver capability. 10 MHz signal from any output channel

of MG73-A (channel 1 thru channel 6) can be fed into the “10 MHz IN” of the MG73-B.

Additional 6 channels become available. Furthermore, any output of MG73-B (channel 1 thru

channel 6) can also serve the same purpose to keep expanding. Lab tests have shown that no

signal degradation noticed even up to 10 cascading. This means the whole facility requires

only one unit of MG73-A but you can have as many of MG73-B units as you need. All these

signals have identical traceability to the original GPS disciplined 10 MHz reference.

- 5 -

SECTION 5: MAINTENANCE

Mercury MG73-B GPS Frequency Reference Distributor provides years of maintenance-free

operation. Should the system experience a problem, the monitor program and the LEDs on the

front panel provide visual warning. Contact Mercury United for technical support to remove the

problem.

There are no user-serviceable parts inside the system. Remove the cover will void the warranty.

It is extremely unusual that the user needs to open the cover to service the unit.

SECTION 6 – IN CASE OF DIFFICULTY

Should you have difficulty with the installation or operation of your MG73-B, please take a few

minutes to look through this manual. You will find the answers to most of your questions here.

If you are still having difficulty after reviewing the manual, please contact us for technical

support and assistance.

6.1 CONTACTING MERCURY UNITED

If you need to contact Mercury United, please telephone, fax or write to us at

Mercury United Electronics, Inc.

10823 Edison Court

Rancho Cucamonga, California 91730 U.S.A.

Tel: (909) 466-0427

FAX: (909) 466-0762

E-mail:sales-us@mercury-crystal.com

Before you call, please have the following information available so that we may better assist

you in trying to resolve the problem immediately:

1. Model number and serial number of the unit

2. Purchase date

3. The company or store name where is the equipment was purchased from.

4. An accurate description of the problem.

- 6 -

6.2 RETURNING EQUIPMENT FOR REPAIR

Should it become necessary for you to return equipment for repair, please take the following

steps:

1. Contact us to obtain a Return Authorization (RMA) number. We can accept repair

returns that have an RMA assigned.

2. Carefully pack the equipment and clearly mark the RMA number on the outside of

the package.

3. Ship the package freight or postage prepaid to the above address. Be sure to

include any items or accessories that we have asked to have included and any

information that may be helpful in resolving the problem. Also be sure to include

your name and information on how to contact you so that we can get additional

information from you if needed and let you know when the equipment has been

repaired.

APPENDIX A: SPECIFICATIONS

The specifications and characteristics of the MG73-B GPS Frequency Reference Distributor are

provided in this appendix.

10.0 MHz Outputs (Output Channel 1 ~ 6). If the reference signal is from MG73-A.

Output Wave Form: Sinusoidal

Output Level: 12.5 dBm±2.5 dBm. into 50 Ω.

6 channels. BNC connectors.

Output Wave Form: Sine wave

SSB Phase Noise: -120 dBc/Hz at 10 Hz offset -135 dBc/Hz at 100 Hz offset

-135 dBc/Hz at 1 KHz offset -145 dBc/Hz at 10 KHz offset

-145 dBc/Hz at 100 KHz offset

Harmonic Level: -40 dBc max.

Spurious: -70 dBc max.

Short Term Stability: ≤5E-12

Aging: None. Corrected by GPS

Temperature Effect: None. Corrected by GPS

Frequency Accuracy: 1E-11 or better (one-day average)

Environmental Specifications

Power Supply: 115 / 125V ±10% AC

Operating Temperature: 0°C ~ +60°C

Storage Temperature: -40°C ~ +85°C

Operating Humidity: 95% non-condensing

Maximum Altitude: 18,000 m

Weight: approx. 3.2 Kgs (7 ib)

Physical Dimensions: 12”(W) x 8”(L) x 4 -1/4”(H); 305 mm (W) x 203 mm (L) x 108 mm (H)

Power Consumption: 7 watts.