Orolia 8182 NetClock/2 WWVB Synchronized Master Clock User manual

MODEL 8182 NETCLOCK/2

WWVB SYNCHRONIZED MASTER CLOCK

INSTRUCTION MANUAL

SPECTRACOM CORPORATION

101 DESPATCH DRIVE

EAST ROCHESTER, NY 14445-1484

PHONE 585-381-4827

FAX 585-381-4998

www.spectracomcorp.com

Copyright  2002 Spectracom Corporation. All rights

reserved. Contents of this publication may not be

reproduced in any form without the written permission of

Spectracom Corporation.

REVISIONS, IF ANY, ARE LOCATED AT THE END OF THE MANUAL

REVISION 1.2

SEPTEMBER 2002

WARRANTY REGISTRATION

Spectracom Corporation

101 Despatch Drive

East Rochester, New York 14445

Phone 585-381-4827, Fax 585-381-4998

Dear Customer,

Spectracom occasionally contacts customers regarding our products. We must know to

whom we should send manual updates, change notices, and new product information.

Because people sometimes change job assignments, we request department, mail station,

and title information to ensure that correspondence in future years will reach either the

user of our products or his/her supervisor. In filling out the registration, please use the

title or mail station or department of the supervisor most interested in keeping the

equipment and its documentation up-to-date. Thank you.

----------------------------------------------------------------------------------------------------------

Name_________________________ Title________________________________

Department ____________________ Mail Stop____________________________

Company______________________ Model Number _______________________

Address _______________________ Serial No. ___________________________

City __________________________ Date Installed ________________________

State _________________________ Zip_________________________________

Telephone _____________________ Ext. ________________________________

Comments: ______________________________________________________________

________________________________________________________________________

TIME OF DAY PRODUCT FIVE YEAR WARRANTY

LIMITED WARRANTY AND WARRANTY CLAIMS: Spectracom warrants each new product

manufactured and sold by it to be free from defects in material, workmanship, and construction, except for

batteries, fuses, or other material normally consumed in operation that may be contained therein, for five

years after shipment to the original purchaser (which period is referred to as the "warranty period"). This

warranty shall not apply if the product is used contrary to the instructions in its manual or is otherwise

subjected to misuse, abnormal operations, accident, lightning or repairs or modifications not performed by

Spectracom. Spectracom is not responsible for products that it does not manufacture.

Software and receiver modules not manufactured by Spectracom and any cable assemblies and adapters are

warranted for one year from date of shipment and subject to exceptions listed above.

Spectracom's obligation under this warranty is limited to in-factory service and repair, at Spectracom's

option, of the product or the component thereof which is found to be defective. If in Spectracom's

judgment the defective condition in a Spectracom product is for a cause listed above for which Spectracom

is not responsible, Spectracom will make the repairs or replacement of components and charge its then

current price, which buyer agrees to pay.

Spectracom shall not have any warranty obligations if the procedure for warranty claims is not followed.

Notify Spectracom of the claim with full information as to the claimed defect. Spectracom products shall

not be returned unless a return authorization number is issued by Spectracom. Spectracom products must

be returned with the description of the claimed defect and identification of the individual to be contacted if

additional information is needed. Spectracom products must be returned properly packed with

transportation charges prepaid.

EXCEPT FOR THE LIMITED WARRANTY STATED ABOVE, SPECTRACOM DISCLAIMS ALL

WARRANTIES OF ANY KIND WITH REGARD TO SPECTRACOM PRODUCTS OR OTHER

MATERIALS PROVIDED BY SPECTRACOM, INCLUDING WITHOUT LIMITATION ANY

IMPLIED WARRANTY OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Spectracom shall have no liability or responsibility to the original customer or any other party with respect

to any liability, loss, or damage caused directly or indirectly by any Spectracom product, material, or

software sold or provided by Spectracom, replacement parts or units, or services provided, including but

not limited to any interruption of service, excess charges resulting from malfunctions of hardware or

software, loss of business or anticipatory profits resulting from the use or operation of the Spectracom

product or software, whatsoever or howsoever caused. In no event shall Spectracom be liable for any

direct, indirect, special or consequential damages whether the claims are grounded in contract, tort

(including negligence), or strict liability.

EXTENDED WARRANTY COVERAGE

Extended warranties can be purchased for additional periods beyond the standard five year warranty.

Contact Spectracom during the last year of the standard five year warranty for extended coverage.

6/1/98

TABLE OF CONTENTS

SECTION 1 GENERAL INFORMATION PAGE

1.0 INTRODUCTION ....................................................................................... 1-1

1.1 FEATURES ................................................................................................. 1-2

1.2 WARRANTY INFORMATION AND PRODUCT SUPPORT.................. 1-2

1.3 MANUAL ERRATA AND SPECIAL DOCUMENTATION.................... 1-3

1.4 UNPACKING.............................................................................................. 1-3

1.5 SPECIFICATIONS...................................................................................... 1-3

1.5.0 Receiver ....................................................................................... 1-3

1.5.1 Status Indicators and Alarm Outputs........................................... 1-4

1.5.2 Manual Controls .......................................................................... 1-4

1.5.3 Time Data Formats ...................................................................... 1-5

1.5.4 Data Output Specifications.......................................................... 1-5

1.5.5 Serial Communication Port.......................................................... 1-6

1.5.6 Remote Output............................................................................. 1-6

1.5.7 AM IRIG Output.......................................................................... 1-6

1.5.8 IRIG TTL Output......................................................................... 1-6

1.5.9 1PPS Output................................................................................. 1-7

1.5.10 Mechanical and Installation......................................................... 1-7

1.5.11 FCC Compliance ......................................................................... 1-7

1.5.12 Model 8219 Passive Loop Antenna............................................. 1-7

1.5.13 Model 8207 Preamplifier............................................................. 1-8

SECTION 2 INSTALLATION PAGE

2.0 INTRODUCTION ....................................................................................... 2-1

2.1 WWVB ANTENNA SYSTEM ................................................................... 2-1

2.1.1 Antenna Location 2-2

2.1.2 Antenna Installation 2-2

2.1.3 Antenna Cable 2-3

2.1.4 Antenna Surge Suppressor 2-5

2.2 PREPARATION FOR USE......................................................................... 2-6

2.2.1 Propagation Path Delay 2-6

2.2.2 UTC or Local Time Selection 2-8

2.2.3 Automatic Daylight Saving Time 2-8

2.2.4 12- or 24-hour Display Time 2-8

2.2.5 Data Format Selection 2-8

2.2.6 Baud Rate Selection 2-9

2.2.7 IRIG Output Configuration 2-10

2.2.8 Chassis Ground 2-10

2.2.9 AC Input 2-10

SECTION 2 INSTALLATION PAGE

2.3 OPTION 1, RACK MOUNT KIT ............................................................... 2-11

2.4 INITIAL OPERATION ............................................................................... 2-12

SECTION 3 OPERATION PAGE

3.0 INTRODUCTION ....................................................................................... 3-1

3.1 FRONT PANEL FUNCTIONS................................................................... 3-1

3.1.1 Display 3-1

3.1.2 Status Indicators 3-2

3.2 REAR PANEL FUNCTIONS ..................................................................... 3-3

3.2.1 AGC Test Points 3-3

3.2.2 Antenna 3-3

3.2.3 Alarm Outputs 3-4

3.2.4 AC Power 3-5

3.2.5 Chassis Ground 3-6

3.2.6 IRIG TTL Output 3-7

3.2.7 1-PPS Output 3-7

3.2.8 IRIG AM Output 3-7

3.2.9 Serial Comm 3-8

3.2.10 Remote Output 3-9

3.3 SWITCH FUNCTIONS ................................................................................. 3-10

3.3.1 Path Delay Switches 3-11

3.3.2 Time Zone Switches 3-11

3.3.3 Baud Rate Switch 3-11

3.3.4 IRIG Format Switch 3-11

3.3.5 Dip Switch Functions 3-13

3.3.6 Data Format Switch 3-15

3.4 USING THE SERIAL COMM PORT......................................................... 3-16

3.4.1 General Guidelines 3-16

3.4.2 Time Data Formats 3-16

3.4.2.1 Format 0 3-17

3.4.2.2 Format 1 3-18

3.4.2.3 Format 2 3-19

3.4.3 RS-232 Commands and Outputs 3-20

3.4.3.1 Time Command 3-21

3.4.3.2 Version Command 3-21

3.4.3.3 Switch Setting Command 3-21

3.4.3.4 Signal Quality Log Command 3-22

3.4.3.5 Clear Buffer Command 3-23

3.4.3.6 Manual Set Command 3-24

3.5 REMOTE OUTPUT USAGE...................................................................... 3-24

3.5.1 RS-485 Guidelines 3-25

3.5.2 Connection Method 3-25

3.5.3 Termination 3-30

SECTION 4 SERVICE INFORMATION PAGE

4.0 INTRODUCTION ....................................................................................... 4-1

4.1 SIGNAL STRENGTH MEASUREMENT ................................................. 4-1

4.2 RECEPTION PROBLEMS ......................................................................... 4-2

4.2.1 Antenna Lamp 4-2

4.2.2 Signal Lamp 4-2

4.2.3 Time Sync Lamp 4-3

4.3 VCXO ADJUSTMENT............................................................................... 4-4

4.3.1 VCXO Adjustment Procedure 4-4

APPENDIX A WWVB INFORMATION

APPENDIX B IRIG CODE DESCRIPTION PAGE

B.0 INTRODUCTION ....................................................................................... B-1

B.1 IRIG B OUTPUT......................................................................................... B-1

B.1.1 IRIG B General Description B-1

B.2 IRIG E OUTPUT......................................................................................... B-5

B.2.1 IRIG E General Description B-5

LIST OF TABLES

PAGE

TABLE 2-1 TIME ZONE SETTINGS 2-8

TABLE 2-2 DATA FORMAT CONFIGURATION 2-9

TABLE 2-3 BAUD RATES 2-9

TABLE 2-4 IRIG FORMATS 2-10

TABLE 2-5 OPTION 1, CHECKLIST 2-11

TABLE 3-1 SERIAL COMM PIN ASSIGNMENTS 3-8

TABLE 3-2 REMOTE OUTPUT PIN ASSIGNMENTS 3-9

TABLE 3-3 BAUD RATES 3-11

TABLE 3-4 IRIG OUTPUTS 3-13

TABLE 3-5 DATA FORMAT CONFIGURATION 3-15

TABLE 3-6 QUALITY INDICATORS 3-20

TABLE 3-7 CABLE SOURCES FOR RS-485 LINES

OVER 1500 FEET 3-25

TABLE 3-8 CABLE SOURCES FOR RS-485 LINES

UNDER 1500 FEET 3-25

TABLE 4-1 OPTION 1 CHECKLIST 4-1

TABLE 4-2 IRIG FORMATS 4-3

TABLE 4-3 IRIG B CONTROL FUNCTION FIELD 4-6

TABLE 4-4 IRIG E CONTROL FUNCTION FIELD 4-10

TABLE 4-5 OPTION 3 Q-FACTOR TABLE 4-13

TABLE 4-6 STAND-BY TIME BASE DRIFT RATES 4-13

TABLE A-1 BCD WEIGHTING A-1

TABLE A-2 WWVB YEAR DATA A-3

TABLE B-1 IRIG B CONTROL FUNCTION FIELD B-4

TABLE B-2 IRIG E CONTROL FUNCTION FIELD B-7

LIST OF ILLUSTRATIONS

PAGE

FIGURE 1-1 MODEL 8182 NETCLOCK/2 MASTER CLOCK 1-1

FIGURE 2-1 TYPICAL WWVB ANTENNA INSTALLATION 2-1

FIGURE 2-2 MODEL 8219 INSTALLATION 2-3

FIGURE 2-3 GREAT CIRCLE MAP CENTERED ON FORT COLLINS,

COLORADO 2-4

FIGURE 2-4 MP08455 SURGE SUPPRESSOR 2-5

FIGURE 2-5 CONNECTOR ASSEMBLY INSTRUCTIONS 2-6

FIGURE 2-6 PATH DELAY MAP 2-7

FIGURE 2-7 OPTION 1, RACK MOUNT ASSEMBLY 2-12

FIGURE 3-1 MODEL 8182 NETCLOCK/2 FRONT PANEL 3-2

FIGURE 3-2 MODEL 8182 NETCLOCK/2 REAR PANEL 3-4

FIGURE 3-3 ALARM OUTPUT CONNECTOR 3-4

FIGURE 3-4 ALARM RELAY CONTACTS 3-5

FIGURE 3-5 AC POWER MODULE 3-6

FIGURE 3-6 SERIAL COMM PIN NUMBERING 3-8

FIGURE 3-7 REMOTE OUTPUT PIN NUMBERING 3-9

FIGURE 3-8 SWITCH FUNCTIONS 3-10

FIGURE 3-9 WORLD TIME ZONES/TIME ZONE SWITCH SETTINGS 3-12

FIGURE 3-10 ONE-WAY BUS INSTALLATION 3-26

FIGURE 3-11 SPLIT BUS CONFIGURATION 3-26

FIGURE 3-12 MODULAR JACK INTERFACE 3-27

FIGURE 3-13 TIMEVIEW RS-485 INTERFACE 3-28

FIGURE 3-14 MODEL 8179T TIMETAP INTERFACE 3-28

FIGURE 3-15 TIMETALK RS-485 INTERFACE 3-29

FIGURE 3-16 TIMEBURST RS-485 INTERFACE 3-29

FIGURE 3-17 MODEL 8188 RS-485 INTERFACE 3-30

FIGURE 4-1 TEST POINT LOCATIONS 4-6

FIGURE A-1 TYPICAL WWVB COVERAGE AT 50 KW ERP A-2

FIGURE A-2 WWVB TIME CODE FORMAT A-4

FIGURE A-3 DATING OF EVENTS IN THE VICINITY OF

A LEAP SECOND A-5

FIGURE B-1 IRIG B TIME CODE B-2

FIGURE B-2 IRIG E TIME CODE B-6

Model 8182 Instruction Manual Page 1-1

GENERAL INFORMATION

1.0 INTRODUCTION

The National Institute of Standards and Technology (NIST) broadcasts a time and

frequency standard on Station WWVB from Fort Collins, Colorado. WWVB transmits a

60-kHz carrier frequency derived from the National atomic time standard. Time code is

added to the broadcast by reducing carrier power 10 dB once-per-second for fixed

intervals of time. The WWVB code contains information on the current year, day-of-

year, and time reflecting Coordinated Universal Time (UTC). Indicators warning of

Daylight Saving Time, leap second, and leap year are also encoded into the WWVB

transmission. A complete description of WWVB is found in Appendix A of this manual.

The Spectracom NetClock/2, shown in Figure 1-1, receives and demodulates the WWVB

signal. Once the signal is decoded, the NetClock/2 automatically sets and provides

accurate and traceable time data outputs. The outputs may be used to synchronize

computer networks, dispatch consoles, voice loggers and event loggers.

FIGURE 1-1 MODEL 8182 NETCLOCK/2 MASTER CLOCK

Section 1: General Information

Page 1-2 Model 8182 Instruction Manual

1.1 FEATURES

The Spectracom Model 8182 NetClock/2 offers the following features:

NENA Compliant: The Model 8182 conforms to the National Emergency Number

Association, NENA 04-002 PSAP Master Clock Standard.

Traceability: Received WWVB broadcast provides direct traceability to the National

Institute of Standards and Technology.

Automatic Operation: Automatically decodes and synchronizes to the WWVB time

code and adjusts for Daylight Saving Time, Leap Year, and Leap Second corrections.

Timing Outputs: The NetClock/2 timing outputs are used to synchronize voice

recorders, ANI/ALI, consoles, CADs and other devices found in the Dispatch Center.

Each NetClock/2 includes an RS-232 interrogation port, RS-232 and RS-485 broadcast

port, and both amplitude modulated and pulse width coded IRIG outputs.

1.2 WARRANTY INFORMATION AND PRODUCT SUPPORT

Warranty information is found on the leading pages of this manual. Should it become

necessary to exercise the warranty, contact Spectracom Corporation to obtain service or a

replacement.

Spectracom continuously strives to improve its products and therefore greatly appreciates

any and all customer feedback given. Please direct any comments or questions regarding

application, operation, or service to Spectracom's Customer Service Department.

Customer Service is available Monday through Friday from 8:00 A. M. to 5:00 P. M.

Eastern time at 585-381-4827.

In addition, please contact Customer Service to obtain a Return Material Authorization

Number (RMA#) before returning any instrument to Spectracom Corporation. Please

provide the serial number and failure symptoms. Transportation to the factory is to be

prepaid by the customer.

Product support is also available by e-mail. Questions on equipment operation and

applications may be e-mailed to Spectracom at:

[email protected]

Visit our web page for product information and upgrade notices as they become available

at: http://www.spectracomcorp.com

Section 1: General Information

Model 8182 Instruction Manual Page 1-3

1.3 MANUAL ERRATA AND SPECIAL DOCUMENTATION

Information concerning manual corrections or product changes occurring after printing

are found in the Errata Section. Errata, when required, is found at the end of this manual.

Please review and incorporate changes into the manual whenever an Errata Section is

included.

Spectracom will make instrument modifications upon special request. A customer

documentation packet associated with the modification will be included with this manual.

1.4 UNPACKING

Upon receipt, the carton and its contents should be carefully examined. If there is

damage to the carton which results in damage to the unit, contact the carrier immediately.

Retain the carton and packing materials in the event the carrier wishes to witness the

shipping damage. Failing to report shipping damage immediately may forfeit any claim

against the carrier. In addition, notify Spectracom Corporation of shipping damage or

shortages, to obtain replacement or repair services.

Carefully open the shipping carton and remove the packing list from the envelope on the

outside of the carton. Check the packing list against the contents to be sure all items have

been received, including an instruction manual and an ancillary kit.

1.5 SPECIFICATIONS

Sections 1.5.0 through 1.5.11 list the electrical and mechanical specifications for the

Model 8182 NetClock/2. Section 1.5.12 lists the specifications for the Model 8219

Passive Loop Antenna. Section 1.5.13 lists the specifications for the Model 8207 In-line

Amplifier.

1.5.0 Receiver

Received Signal: NIST Station WWVB.

Carrier Frequency: 60 kHz.

Sensitivity: 0.4 µV rms.

Minimum field strength: 25 µV per meter.

Receiver Delay: Typically 19 milliseconds. Actual receiver delay

is recorded on the bottom cover.

Typical Accuracy: ± 1 millisecond when continuously phase locked

and time synchronized.

Section 1: General Information

Page 1-4 Model 8182 Instruction Manual

1.5.1 Status Indicators and Alarm Outputs

Three dual color front panel LED's indicate operational information:

Antenna: Green indicates normal operation.

Red indicates possible problem with the preamplifier or antenna coax.

Signal: Green indicates receiver is phase locked to the carrier.

Alternating red/green warns that the VCXO needs adjustment. See

Section 4, Service Information, in this manual.

Red indicates receiver is not locked to the carrier.

Time Sync: Green indicates synchronization to WWVB to within ±1 millisecond

when continuously carrier locked.

Red indicates unit is not time synchronized to WWVB. Time data

outputs may be in error > 50 milliseconds. The TIME SYNC lamp

turns red after a 1 hour period without carrier lock. The lamp is also

red if the clock is unable to decode valid data over the past 24 hours.

Rear Panel Alarm output relay contacts indicate WWVB synchronization status.

Alarm Output: Time Sync.

Relay Contacts: NO, NC, and common.

Contact Rating: 30 VDC, 2 Amps.

Connector: 4-position terminal strip (supplied).

1.5.2 Manual Controls

All user-selectable parameters are made by switches located on the bottom cover. Switch

functions include the following:

• Data format

• Baud Rate

• Path Delay

• Time Zone Offset

• 12 or 24-hour Display

• Automatic DST corrections

• Manual Set Disable

• IRIG Format

• IRIG AM or TTL

Section 1: General Information

Model 8182 Instruction Manual Page 1-5

1.5.3 Time Data Formats

Three time data formats are available and briefly described below. See Section 3,

Operation, for complete data stream information.

Format 0: (CR)(LF)I(^)(^)DDD(^)HH:MM:SS(^)DTZ=XX(CR)(LF)

Format 1: (CR)(LF)I(^)WWW(^)DDMMMYY(^)HH:MM:SS(CR)(LF)

Format 2: (CR)(LF)IQYY(^)DDD(^)HH:MM:SS.XXX(^)LD

where:

CR = Carriage Return

LF = Line Feed

I = Sync Status (space, ?, *)

Q = Quality Indicator (space,A,B,C,D)

YY = Year (99, 00, 01 etc.)

^ = space

DDD = Day of Year (001 - 366)

HH:MM:SS = Hours:Minutes:Seconds

. = Decimal Separator

XXX = Milliseconds

L = Leap Second Indicator (space, L)

D = Daylight Saving Time Indicator (S,I,D,O)

XX = Time Zone Setting (00-23)

WWW = Day of Week (MON, TUE, WED)

DD = Day of Month (^1-31)

MMM = Month (JAN, FEB, MAR)

1.5.4 Data Output Specifications

Bit Rate: Switch selectable, available settings are 300, 600, 1200, 2400, 4800,

and 9600 baud.

Character Structure: A character consists of 1 start, 8 data, and 1 stop bit, no parity.

Accuracy: The start of the data stream marks the on-time point. Accuracy at

9600 baud with calibrated delay:

Format 0: ±2 milliseconds.

Format 1: ±3 milliseconds.

Format 2: ±2 milliseconds.

At lower baud rates, longer delays reduce accuracy.

Section 1: General Information

Page 1-6 Model 8182 Instruction Manual

1.5.5 Serial Communication Port

Output Signal: RS-232C.

Connector: DB9 Female.

Classification: Data Communication Equipment (DCE).

Command Set: The NetClock/2 responds to the following commands:

T command outputs the time in the selected format.

S command allows the clock to be set manually.

Y command allows the year to be set manually.

R command generate the Signal Quality Log report.

CB command Clear Buffer command resets the Signal Quality Log report.

V command outputs the firmware release level.

W command outputs switch setting information.

1.5.6 Remote Output

Output Signals: RS-232 and RS-485, continuous once per second data stream in

Format 0 or Format 1 only. In addition, RS-485 compatible outputs of

the on-time pulse and time sync status are also present.

Connector: DB9 Female.

1.5.7 AM IRIG Output

Signal: Selectable IRIG B or IRIG E amplitude modulated sinewave.

IRIG B: 1000 Hz carrier.

IRIG E: 100 Hz carrier.

Signal Level: Adjustable from 1.0 - 9.0V p-p mark amplitude into loads ≥600 ohms.

Accuracy: ± 300 microseconds of on-time point.

Connector: BNC.

Output Options: Signature control: This feature removes the modulation code from

the IRIG output whenever the clock is not synchronized to

WWVB.

TTL output: Placing DIP switch 3 in the OFF position changes

this output to a pulse-width coded TTL-compatible output.

1.5.8 IRIG TTL Output

Signal: Selectable IRIG B or IRIG E pulse width coded squarewave.

Signal Level: TTL-compatible.

Accuracy: ± 300 microseconds of on-time point.

Connector: BNC.

Output Options: Signature control: This feature, when selected, removes the pulse

width modulation code whenever the clock is not synchronized to

WWVB.

Section 1: General Information

Model 8182 Instruction Manual Page 1-7

1.5.9 1PPS Output

Signal: One pulse-per-second squarewave locked to the WWVB carrier

and time code. The leading edge represents the on-time point.

Signal Level: TTL-compatible.

Accuracy: ± 1 millisecond of NIST when corrected for receiver and

propagation delays and continuously phase locked.

Connector: BNC.

1.5.10 Mechanical and Installation

Size: 3.0H x 7.8W x 11D inches. (76H x 198W x 279D mm).

Weight: 4.75 lbs. (2.2 Kg) Shipping Wt. 6.25 lbs. (2.9 Kg).

Line Power: 115/230 VAC ±10%, 50/60 Hz, 12 W typical.

Temperature: 32° to 122°F (0° to 50°C).

Rack Mount: Option 1, 3.5H x 19W inches. (89H x 483W mm).

1.5.11 FCC Compliance

This equipment has been tested and found to comply with the limits for a Class A digital

device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide

reasonable protection against harmful interference when the equipment is operated in a

commercial environment. This equipment generates, uses, and can radiate radio

frequency energy and, if not installed and used in accordance with the instruction

manual, may cause harmful interference to radio communications. Operation of this

equipment in a residential area is likely to cause harmful interference in which case the

user will be required to correct the interference at his own expense.

NOTE: Shielded data cables were not required to achieve

FCC compliance.

1.5.12 Model 8219 Passive Loop Antenna

Electrical

Type: Passive ferrite loop antenna

Frequency: Tuned to 60.0 kHz ±0.3 kHz.

Bandwidth: 700 Hz @ 3 dB points.

Minimum field strength: 50 µV/meter.

Temperature range: -30° to +70°C (-22° to 158°F).

Connector: BNC, female.

Recommended cable: RG58.

Maximum cable length: 1500 ft.

Mechanical

Length: 10.0 inches (25.4 cm).

Width: 2.8 inches (7.1 cm).

Housing material: PVC.

Assembled weight: 2.5 lbs (1.13 kg).

Mounting: PVC Mast and hose clamps provided.

Accessories Model 8213 Antenna Base

Model MP08455 Antenna surge Suppressor

Section 1: General Information

Page 1-8 Model 8182 Instruction Manual

1.5.13 Model 8207 Preamplifier

Electrical

Frequency: Tuned to 60.0 kHz ±0.2 kHz.

Bandwidth: 800 Hz @ 3 dB points.

Gain: 40 dB.

Connector: BNC, female.

Mechanical

Size: 5.3L x 2.6W x 1.7H inches

(133L x 67W x 43H mm).

Mounting Pattern: 4.75 x 1.75 inches (121 x 44 mm).

Temperature: 0° to +50°C (32° to 122°F).

Model 8182 Instruction Manual Page 2-1

INSTALLATION

2.0 INTRODUCTION

This section contains installation instructions for the Model 8182 NetClock/2 and

Spectracom WWVB antenna system. To ensure proper operation, please read this

chapter prior to performing the actual installation.

2.1 WWVB ANTENNA SYSTEM

The Spectracom WWVB antenna system consists of the Model 8219 Passive Loop

Antenna and the Model 8207 Preamplifier.

Figure 2-1 illustrates a typical antenna installation including the MP08455 Surge

Suppressor. Refer to Section 2.1.4 for information on the antenna surge suppressor.

The Model 8219 is a passive ferrite loop antenna tuned to receive the 60-kHz WWVB

broadcast. The antenna MUST be installed OUTDOORS. Follow the antenna location

guidelines listed in Section 2.1.1 when selecting a mounting location. The Model 8219 is

a directional antenna. Refer to Section 2.1.2 and Figure 2-3 for aiming instructions.

The Model 8207 is a low-noise 40 dB gain amplifier. The Model 8207 installs into the

antenna feed line and is powered by the NetClock/2. Install the Model 8207 indoors,

preferably where the antenna coax enters the building. Connect the coax from the

antenna to the input side of the Model 8207. Connect the output side to the NetClock/2

Receiver. Each Model 8207 includes two field-installable BNC connectors to splice the

preamplifier into the antenna RG-58 coax. Refer to Figure 2-5 for connector assembly

instructions.

FIGURE 2-1 TYPICAL WWVB ANTENNA INSTALLATION

Section 2: Installation

Page 2-2 Model 8182 Instruction Manual

2.1.1 Antenna Location

Proper antenna placement is crucial for optimum receiver operation. Observe the

following guidelines when selecting an antenna site.

• The antenna must be installed outdoors. Locate the antenna where it will not be

disturbed. A rooftop location is preferred over placement on an antenna tower.

• To optimize the signal-to-noise ratio, locate the antenna as far as possible from

local RF noise sources such as any broadcast antenna, large electric motors or

power lines. Any equipment containing a switching power supply is a probable

source of interference.

• Antenna height is not critical, as the WWVB 60-kHz carrier is a ground wave.

Holding the antenna two to three feet off the ground or rooftop is adequate.

• To prevent regeneration, the antenna must be kept a minimum of 25 feet from the

preamplifier. Locate the preamplifier at least 10 feet from the receiver. Never

place an antenna or preamplifier next to or on top of the receiver.

• Locate the antenna a minimum of 10 feet from another Model 8219 antenna when

installations require more than one antenna.

• Mount the antenna a minimum of 2 feet away from any steel structures, beams,

roof decking, pipes, etc., as metal will detune the antenna and may cause as much

as a 20 dB degradation of the signal-to-noise ratio.

2.1.2 Antenna Installation

Each antenna includes a two-foot long mast assembly and two hose clamps to simplify

installation. The hose clamps may be used to affix the mast to a roof vent as shown in

Figure 2-1. Spectracom offers an aluminum antenna stand, Model 8213, for installations

where vent pipe mounting is not practical or desired. The Model 8213, shown in Figure

2-2, is furnished with ballast for added stability.

The Model 8219 is a directional antenna. The tubular housing must be positioned

broadside to Fort Collins, Colorado, (See Figure 2-2) and horizontal to the ground to

allow maximum signal reception. No signal will be received if the tube points directly

toward the transmitter site, as the antenna pattern nulls are located off the ends of the

tube. The Great Circle Map shown in Figure 2-3 is used to determine the correct antenna

orientation per receiver location. Follow the instructions below the map scale to

determine a compass heading. The antenna position may be optimized using the AGC

measurements described in Section 4.1, Signal Strength Measurement.

Section 2: Installation

Model 8182 Instruction Manual Page 2-3

FIGURE 2-2 MODEL 8219 INSTALLATION

2.1.3 Antenna Cable

Spectracom recommends RG-58 coax for the antenna cable, though other 50-ohm coax

with superior specifications may be used. The antenna coax provides the preamplifier

with its DC operating voltage and the receiver with the amplified WWVB signal.

Spectracom offers RG-58 antenna coax terminated with BNC connectors. Specify part

number CA01xxx, where xxx equals the cable length in feet. Apply a weatherproof

sealant or tape over the antenna BNC connector to ensure the connection integrity.

Due to low attenuation characteristics at 60 kHz and the very low power requirement of

the preamplifier (10 mW), cable lengths up to 1,500 feet are possible. Avoid bundling

the antenna cable with other cables whenever possible.

Section 2: Installation

Page 2-4 Model 8182 Instruction Manual

FIGURE 2-3 GREAT CIRCLE MAP CENTERED

ON FORT COLLINS, COLORADO

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Orolia 8182 NetClock/2 WWVB Synchronized Master Clock User manual

Orolia 8182 NetClock/2 WWVB Synchronized Master Clock User manual

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