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Spectracom 8194B Instruction Manual

Gps ageless master oscillator
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GPS AGELESS
MODEL 8194B, 8195B, 8197B
INSTRUCTION MANUAL
S
PECTRACOM
95 M
ETHODIST
R
OCHESTER
P
HONE
F
AX
www.spectracomcorp.com
Part Number 1132-5000-0050
Manual Revision B
November 2005
®
MASTER OSCILLATOR
C
ORPORATION
H
D
ILL
RIVE
, NY 14623
585.321.5800
585.321.5219

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  • Page 1 ® GPS AGELESS MASTER OSCILLATOR MODEL 8194B, 8195B, 8197B INSTRUCTION MANUAL PECTRACOM ORPORATION 95 M ETHODIST RIVE , NY 14623 OCHESTER 585.321.5800 HONE 585.321.5219 www.spectracomcorp.com Part Number 1132-5000-0050 Manual Revision B November 2005...
  • Page 2 Copyright © 2005 Spectracom Corporation. The contents of this publication may not be reproduced in any form without the written permission of Spectracom Corporation. Printed in USA. Specifications subject to change or improvement without notice. Spectracom, NetClock, Ageless, TimeGuard, TimeBurst, TimeTap, LineTap, MultiTap, VersaTap, and Legally Traceable Time are Spectracom registered trademarks.
  • Page 3 If in Spectracom’s judgment the defective condition business or anticipatory profits resulting from the use or in a Spectracom product is for a cause listed above for which operation of the Spectracom product or software, whatsoever Spectracom is not responsible, Spectracom will make the or howsoever caused.

  • Page 5: Table Of Contents

    Spectracom Corporation 8194B, 8195B, 8197B Table of Contents ® GPS AGELESS MASTER OSCILLATOR ..............1 MODEL 8194B, 8195B, 8197B..................1 INSTRUCTION MANUAL ....................1 GENERAL INFORMATION ................1-1 Introduction...................... 1-1 Features ......................1-1 Warranty Information and Product Support..........1-3 Manual Errata and Special Documentation ........... 1-4 Unpacking ......................
  • Page 6 8194B, 8195B, 8197B Spectracom Corporation Antenna Cable ....................2-2 2.3.1 Cable Lengths .................... 2-3 Model 8226 Impulse Suppressor..............2-3 Model 8227 GPS Inline Amplifier..............2-6 Master Oscillator Preparation for Use ............2-8 2.6.1 Antenna Connection ................... 2-8 2.6.2 AC Power ....................2-8 2.6.3...
  • Page 7 Spectracom Corporation 8194B, 8195B, 8197B 3.3.10 DC Power ....................3-20 3.3.11 AC Power ....................3-21 3.3.12 Cooling fan ....................3-22 3.3.13 Chassis Ground..................3-22 3.3.14 Battery Disconnect Switch................ 3-22 SOFTWARE COMMANDS ................4-1 Introduction...................... 4-1 RS-232 Commands..................4-1 RS-232 Command descriptions..............4-2 4.3.1...
  • Page 8 8194B, 8195B, 8197B Spectracom Corporation 4.5.7 Location....................4-32 4.5.8 Signal Selection..................4-33 4.5.9 Short Status....................4-33 4.5.10 Time And Date ..................4-33 4.5.11 Time Zone Offset..................4-34 4.5.12 Who – Model Identification ............... 4-34 4.5.13 10MHz Offset ................... 4-35 4.5.14 1PPS Offset....................
  • Page 9 Figure 3-1 Spectracom Master Oscillator Front Panel..........3-3 Figure 3-2 RS-232 Com Pin Numbering............... 3-5 Figure 3-3 Spectracom Master Oscillator Model 8195B and 8197B Rear Panel..3-7 Figure 3-4 Spectracom Master Oscillator Model 8194B Rear Panel ......3-8 Figure 3-5 Timing Output Connector ................3-10 Figure 3-6 RS-485 Output ..................
  • Page 10 8194B, 8195B, 8197B Spectracom Corporation Figure 5-4 Data Sync Connector ................5-12 Figure 5-5 Data Sync Drivers ..................5-14 Figure 5-6 Data Clock Connector ................5-21 Figure 5-7 DS1 Framed All Ones Connector.............. 5-22 Figure 5-8 Frame Selection Jumper ................5-22 Figure 5-9 Programmable Jumper Locations .............

  • Page 11: Introduction

    OCXO versions and ± 1.0 x 10 frequency accuracy for Rubidium version. • Precise Offsets: The Model 8194B/8195B disciplined 10 MHz outputs can be offset in precise steps to improve VHF - Hi simulcast. * PATENT NO. 4,525,685...

  • Page 12: Table 1-1 Product Comparison Table

    8194B, 8195B, 8197B Spectracom Corporation • Reliable Worldwide Operation: The Master Oscillator can receive and track up to twelve satellites simultaneously. Receivers qualify the received GPS broadcast using T-RAIM. T-RAIM, Time Receiver Autonomous Integrity Monitoring is an algorithm that disqualifies a satellite from a solution if its message is not within a reasonable window of other satellites currently tracked.

  • Page 13: Warranty Information And Product Support

    • The GPS receiver carries a one-year warranty. • The Rubidium oscillator carries a two-year warranty. The remainder of the product is covered under Spectracom’s five-year warranty. Should it become necessary to exercise the warranty, contact Spectracom Corporation to obtain a replacement or service.

  • Page 14: Manual Errata And Special Documentation

    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 a replacement or repair services.

  • Page 15: Specifications

    Antenna, Model 8226 Impulse Suppressor, and the Model 8227 Inline Amplifier. Specifications pertaining to the Master Oscillator options are found in Section 5. Some options and features are only available on certain models in the Spectracom Ageless Master Oscillator family. The details on the options and features available for each model are found in the Table 1-1 Product Comparison Table.

  • Page 16: Ovenized Oscillator Frequency Stability

    Option 16: Changes the third and fourth rear panel Frequency Outputs from 10MHz to 1PPS. 1.6.3 Ovenized Oscillator Frequency Stability Oscillator Type: 10 MHz OCXO, SC cut. For Model 8194B and 8195B Locked Accuracy: ±1 x 10 , 24-hour average when locked to GPS and no frequency offsets selected.

  • Page 17: Rubidium Oscillator Frequency Stability

    Spectracom Corporation 8194B, 8195B, 8197B Aging Rate: Unit automatically corrects for oscillator aging when locked to GPS. After 30 days of continuous operation, when unlocked, <5 x 10 /day. 1.6.4 Rubidium Oscillator Frequency Stability Oscillator Type: 10 MHz Rubidium. For Model 8197B Locked Accuracy: 24-Hour Average accuracy is typically ±1 x 10...

  • Page 18: 1544 Khz Timing Outputs

    8194B, 8195B, 8197B Spectracom Corporation Delay Control: This output is made leading edge synchronized to the recovered GPS 1PPS. Using the 1PPS offset command, 1PO, the Data Clock 1PPS output can be offset from 0 to 1 second in 0.1 microsecond steps. The front panel 1PPS shall be synchronized within ±500 nanoseconds of other...

  • Page 19: Data Clock Timing Outputs

    Spectracom Corporation 8194B, 8195B, 8197B Optional Outputs: Option 06, 12.8 MHz outputs, changes the 2048 kHz output on this connector to 1600 kHz 1.6.8 Data Clock Timing Outputs Signals: 1PPS, 9.6 kHz, 18.0 kHz, derived from the 10 MHz GPS...

  • Page 20: Indicator Lamps

    8194B, 8195B, 8197B Spectracom Corporation Accuracy: The 17 2/3 Hz and 33 1/3 Hz Data Sync outputs are leading edge synchronized to within ±400 nanoseconds of the Data Clock 1PPS output. Using the 1PPS offset command, 1PO, the Data Clock 1PPS output can be offset from 0 to 1 second in 0.1 microsecond steps.
  • Page 21 Spectracom Corporation 8194B, 8195B, 8197B 1.6.11.1 Alarm Classifications Major Alarm: A Major alarm is asserted when detected faults compromise output accuracy. The alarm relays reset when the fault condition is corrected. Faults and conditions listed below actuate a Major Alarm: •...
  • Page 22 8194B, 8195B, 8197B Spectracom Corporation • Low Quality Alarm: Warns of low GPS signal quality. The alarm is asserted whenever the "Q" value in Tracking Histogram is below 3000. • Replace Battery: Internal battery pack, Option 02 only, has failed daily test, needs replacement.
  • Page 23 Spectracom Corporation 8194B, 8195B, 8197B 1.6.11.3 Alarm Interface Alarm relay contacts are provided on the Alarm Outputs, Data Sync, Data Clock, 1544 kHz and 2048 kHz timing output connectors. Major Alarm, Minor Alarm. Alarm Outputs: Connector: 7-position terminal block, rear panel...

  • Page 24: Communication Ports

    8194B, 8195B, 8197B Spectracom Corporation 1.6.12 Communication Ports The Master Oscillator has a front panel RS-232 and a rear panel RS-485 communication port. The communication ports are used to monitor and set operational parameters. RS-232 Com Signal: RS-232C, DCE Connector:...

  • Page 25: Mechanical

    Spectracom Corporation 8194B, 8195B, 8197B Isolated Input Power DC Power Options Option 52, ±12 VDC Option 53, ±24 VDC Option 54, ±48 VDC Fuse: Option 52, 10.0 Amp, 250V, Fast Option 53, 6.25 Amp, 250V, Slo-Blo Option 54, 3.0 Amp, 250V, Slo-Blo...

  • Page 26: Model 8225 Gps Antenna Specifications

    8194B, 8195B, 8197B Spectracom Corporation 1.6.17 Model 8225 GPS Antenna Specifications 1.6.17.1 Electrical Specifications Type: Active. Frequency: 1575.42 MHz. Temperature Range: -30° to 80° C (-22° to 176°F) Gain: 30 dB Connector: N type, Female Recommended Cable: LMR-400 Maximum Cable Length:...

  • Page 27: Installation

    The hose clamps can be used to affix the mast assembly to a vent pipe. Spectracom offers an antenna base, Model 8213, for installations where vent pipe mounting is not practical or desired. The Model 8213 is constructed of aluminum and is furnished with ballast for stability.

  • Page 28: Antenna Cable

    Figure 2-1 Antenna Installation 2.3 Antenna Cable Spectracom recommends low loss coax, such as Times Microwave LMR-400, for the GPS antenna cable. To simplify the installation process, Spectracom offers GPS cable assemblies terminated with Type N Male connectors. Specify part number CAL7xxx, where xxx equals the length in feet.

  • Page 29: Cable Lengths

    Connect the largest gauge grounding wire available to the Model 8226 ground stud. Optionally the suppressor can be mounted to a grounding panel or bulkhead using the BF adapter bracket as shown in Figure 2-2. Spectracom offers the bracket under part # MP10-0000-0002.

  • Page 30: Figure 2-3 Grounding Panel Installation

    8194B, 8195B, 8197B Spectracom Corporation In addition, Spectracom offers a copper grounding panel kit, part number 8226-0002- 0600, as a single point ground connection for the antenna surge suppressor, equipment rack, GPS receiver and other surge protection devices to a perimeter ground system. A single point ground system is recommended to provide optimum protection from lightning strikes.
  • Page 31 Each Model 8226 includes two clamp type male N connectors. These connectors can be used to splice the Model 8226 into the antenna coax. The connectors are compatible with Spectracom CAL7xxx cable assemblies and Times Microwave LMR- 400 equivalent coax. Connector assembly instructions are shown below in Figure 2-4. Assembly Instructions Part Number P051-0001-0100 Type N Connectors The table below lists the recommended tools needed to assemble the connectors.

  • Page 32: Model 8227 Gps Inline Amplifier

    Each Model 8227 includes two clamp type male N connectors. These connectors can be used to splice the Model 8227 into the antenna coax. The connectors are compatible with LMR-400 type coax such as Spectracom CAL7xxx or LMR-400. Refer to Figure 2-4 for connector assembly instructions. GPS Ageless Master Oscillator Instruction Manual...

  • Page 33: Figure 2-6 Cable Guidelines

    Refer to Figure 2-6 for Model 8227 installation guidelines. The cable lengths shown in Figure 2-6 represent Spectracom CAL7xxx cable. The equivalent cable loss expressed in dB, is provided for use with other cables. Place the inline amplifier within 200 feet (10 dB cable loss) of the antenna to optimize the signal to noise ratio.

  • Page 34: Master Oscillator Preparation For Use

    8194B, 8195B, 8197B Spectracom Corporation 2.6 Master Oscillator Preparation for Use This section outlines the set-up procedure to prepare the Master Oscillator for operation. 2.6.1 Antenna Connection Install the Model 8225 Antenna and related accessories as outlined previously in this section.

  • Page 35: Dc Power

    DC power options allow operation from various DC power sources. Table 2-1 lists the DC power configurations available. Power is 20 Watts for 8195B units and 60 watts for Model 8197B units. DC power options are not available on the Model 8194B. Power Option...

  • Page 36: Initial Operation

    10 seconds if a backup power source is present. Models 8194B and 8195B require a minimum of 4 hours to reach operational temperature and stabilize and discipline to GPS. The Model 8197B may require up to 6 hours.

  • Page 37: Gps Signal Status

    Spectracom Corporation 8194B, 8195B, 8197B 2.8.1 GPS Signal Status The GPS Signal Status command, GSS, provides an instantaneous view of the GPS reception quality. This command is used to verify proper antenna placement and receiver performance of an installation. The GSS response indicates the number of satellites the receiver is currently tracking and their relative signal strength.

  • Page 38: Tracking Histogram

    8194B, 8195B, 8197B Spectracom Corporation Satellite Data: Data on each satellite currently tracked is provided in table form. The CHAN column represents the GPS Receiver Channel Number, 1 through 12. VID is the Vehicle (satellite) Identification Number, 1 through 37.

  • Page 39: Reception Troubleshooting

    Refer to Section 2.9.2 for recommendations. 2.9 Reception Troubleshooting Please review this section prior to calling the Spectracom Customer Service Department. If the reception problem cannot be solved following the guidelines outlined in this section, please call for Customer Service at 585.321.5800.
  • Page 40 8194B, 8195B, 8197B Spectracom Corporation suppressor may be tripping prematurely. The easiest way to test the Model 8226 is to temporarily replace it with a Type N barrel connector. If the receiver begins tracking satellites within 20 minutes, the impulse suppressor has failed and must be replaced.

  • Page 41: Low Gps Quality

    Spectracom Corporation 8194B, 8195B, 8197B 2.9.2 Low GPS Quality Cable Length: Excessively long or improper cable type may cause low GPS quality due to cable attenuation. Long GPS antenna lengths may require an inline amplifier. Refer to Section 2.3 for GPS cable recommendations and Section 2.5 for inline amplifier information.
  • Page 42 8194B, 8195B, 8197B Spectracom Corporation 2-16 GPS Ageless Master Oscillator Instruction Manual...

  • Page 43: Operation

    3.1 Introduction This section describes the front and rear panel functions, and operational information for the Spectracom GPS Ageless Master Oscillator. 3.2 Front Panel Functions The front panel (with the battery option) is shown in Figure 3-1. The paragraphs below describe the indicators and connectors found on the front panel.
  • Page 44 8194B, 8195B, 8197B Spectracom Corporation 3.2.2.1 Major Alarm Lamp This lamp turns on when any of the Major Alarm condition is present. The lamp turns off when the fault condition is corrected. A Major Alarm is asserted when the following...

  • Page 45: Figure 3-1 Spectracom Master Oscillator Front Panel

    Spectracom Corporation 8194B, 8195B, 8197B Figure 3-1 Spectracom Master Oscillator Front Panel GPS Ageless Master Oscillator Instruction Manual...

  • Page 46: Battery Lamps (Option 02 Only)

    8194B, 8195B, 8197B Spectracom Corporation Low Quality Alarm: Warns of low GPS signal quality. The alarm is asserted whenever the "Q" value in the Tracking Histogram is below 3000. Replace Battery: Internal battery pack, Option 02 only, has failed daily test, needs replacement.

  • Page 47: 10 Mhz Output

    Spectracom Corporation 8194B, 8195B, 8197B Figure 3-2 RS-232 Com Pin Numbering SIGNAL DESCRIPTION Receive Data Transmit Data Signal Common Data Set Ready Request to Send Clear to Send * Pins 7 and 8 are connected together internally. Table 3-1 RS-232 Com Pin Assignments The RS-232 Com port is configured as data communication equipment (DCE).

  • Page 48: Rear Panel Functions

    Spectracom Corporation 3.3 Rear Panel Functions The Model 8195B and 8197B rear panel is shown in Figure 3-3. The Model 8194B rear panel is shown in Figure 3-4. The following paragraphs describe each of the rear panel functions that are available for the Spectracom Master Oscillator Family. Note that the Model 8194B does not have all of the rear panel functions.

  • Page 49: Figure 3-3 Spectracom Master Oscillator Model 8195B And 8197B Rear Panel

    Spectracom Corporation 8194B, 8195B, 8197B Figure 3-3 Spectracom Master Oscillator Model 8195B and 8197B Rear Panel GPS Ageless Master Oscillator Instruction Manual...

  • Page 50: Figure 3-4 Spectracom Master Oscillator Model 8194B Rear Panel

    8194B, 8195B, 8197B Spectracom Corporation Figure 3-4 Spectracom Master Oscillator Model 8194B Rear Panel GPS Ageless Master Oscillator Instruction Manual...

  • Page 51: Table 3-2 Uhf Simulcast Offsets

    Spectracom Corporation 8194B, 8195B, 8197B The Spectracom Master Oscillator Simulcast Transmitter Offset provides an accurate, controlled frequency reference that is continuously "frequency locked" to GPS. This reference can be used by synthesized transmitters to provide "ageless" frequency control, including offsets, at an accuracy of ±1.0 x 10 The simulcast offsets are divided into two groups;...

  • Page 52: 1544 Khz And 2048 Khz Timing Outputs

    8194B, 8195B, 8197B Spectracom Corporation The frequency offset at the carrier frequency is determined by the formula: Δf c = F c x Δf s Δf c = carrier offset where: F c = carrier frequency Δf s = offset of 10 MHz standard (from the tables) 3.3.2.3...

  • Page 53: Figure 3-6 Rs-485 Output

    Spectracom Corporation 8194B, 8195B, 8197B SIGNAL NOTES + Frequency RS-485 B Terminal - Frequency RS-485 A Terminal Ground Cable Shield/Relay Ground MAJOR C Common MAJOR NO Normally Open MAJOR NC Normally Closed Table 3-4 Timing Output Pin Assignments NOTE: A units equipped with Option 06, 12.8 MHz outputs, changes the 2048 kHz output to 1600 kHz.

  • Page 54: Data Clock Timing Outputs

    8194B, 8195B, 8197B Spectracom Corporation TTL-Compatible Input N. C. 100-ohm Termination Resistor Figure 3-7 Single-Ended Connection 3.3.3.2 Major Alarm Contacts Major Alarm relay contacts are found on Pins 4, 5 and 6 of each timing output connector. During normal operation the Major Alarm relay is energized causing continuity between Pin 4 and Pin 6.

  • Page 55: Figure 3-9 Rs-485 Line Driver

    Spectracom Corporation 8194B, 8195B, 8197B The Data Clock timing signals are derived from the 10 MHz GPS disciplined oscillator. The 1PPS and 9.6-Hz outputs are leading edge synchronized to the GPS 1 PPS output. Using the 1PPS offset command; 1PO, the outputs can be offset from 0 to 1 second in 0.1 microsecond steps.

  • Page 56: Set Up Switches

    8194B, 8195B, 8197B Spectracom Corporation 3.3.5 Set Up Switches The Set-Up Switches configure the RS-485 address, baud rate and termination. 3.3.5.1 RS-485 Address The Address switches give each unit installed on an RS-485 bus a unique identity. The address may range from 0 – 31, DIP-switches 1 through 5 enter the binary equivalent of the selected address.

  • Page 57: Com

    Spectracom Corporation 8194B, 8195B, 8197B 3.3.5.4 Termination Switch 10 terminates the RS-485 Receive line with 120 ohms. Place Switch 10 in the ON position when the unit is installed at the end of the RS-485 bus. Place this switch in the OFF position when the unit is not the last device on the bus.

  • Page 58: Data Sync Timing Outputs

    8194B, 8195B, 8197B Spectracom Corporation TRANSMIT RECEIVE Figure 3-11 RS-485 Connection 3.3.7 Data Sync Timing Outputs This connector provides RS-485 clock signals of 17 2/3 Hz, 33 1/3 Hz, 18 kHz, 64 kHz and Major Alarm relay contacts. The connector is a 15-Pin series D female numbered as shown in Figure 3-12.

  • Page 59: Table 3-8 Data Sync Pin Assignments

    Spectracom Corporation 8194B, 8195B, 8197B SIGNAL DESCRIPTION + 64 kHz RS-485 B Terminal -64 kHz RS-485 A Terminal +18 kHz RS-485 B Terminal -18 kHz RS-485 A Terminal + 17 2/3 Hz RS-485 B Terminal -17 2/3 Hz RS-485 A Terminal...

  • Page 60: Major Alarm Contacts

    8194B, 8195B, 8197B Spectracom Corporation 3.3.7.1 RS-485 Outputs RS-485 is a balanced differential transmission requiring twisted pair cable. Cable lengths up to 4000 feet are possible when using cables specifically designed for RS-485 applications, like Belden 9844 or equivalent. These cables have a braided shield, nominal impedance of 120 ohms, and a capacitance of 12 to 15 picofarads per foot.

  • Page 61: Figure 3-14 Alarm Outputs Terminal Block

    Spectracom Corporation 8194B, 8195B, 8197B Figure 3-14 Alarm Outputs Terminal Block A Major Alarm is asserted when any of the following Alarm conditions exist: Frequency, Tracking Alarm 2, Tracking Alarm 3, CPU or the unit is placed in Test Mode. During normal operation the Major Alarm relay is energized.

  • Page 62: Figure 3-15 Dc Backup Wiring

    8194B, 8195B, 8197B Spectracom Corporation 3.3.10 DC Power The DC Power connector provides primary or backup power to the unit On AC powered units, the DC power connector allows connection of a backup power source. The backup source powers the oscillator and GPS receiver module whenever AC power is interrupted.

  • Page 63: Ac Power

    Spectracom Corporation 8194B, 8195B, 8197B DC power options, 52, 53, and 54, have isolated inputs, which permits operation from a positive or negative power source. To reduce RFI/EMI emissions use a shielded power cable. Connect the cable shield to the chassis ground pin labeled “G”.

  • Page 64: Cooling Fan

    8194B, 8195B, 8197B Spectracom Corporation Figure 3-17 AC Power Module 3.3.12 Cooling fan Cooling fan operation is microprocessor controlled. The fan is turned on when the internal temperature measures 50°C and off when the temperature reaches 30°C. 3.3.13 Chassis Ground The chassis ground lug allows the unit’s chassis to be connected to an earth ground in...

  • Page 65: Software Commands

    Spectracom Corporation 8194B, 8195B, 8197B 4 Software Commands 4.1 Introduction This chapter describes commands that are asserted through the front panel RS-232 COMM and the rear panel RS-485 COMM connectors. 4.2 RS-232 Commands From the front panel RS-232 COMM port the user may configure, control and monitor the unit.

  • Page 66: Command Descriptions

    8194B, 8195B, 8197B Spectracom Corporation COMMAND DESCRIPTION MODE SECTION Antenna Cable Delay READ/SET 4.2.1 Alarm Time Out READ/SET 4.2.2 Battery Status READ 4.2.3 Clear Alarms 4.2.4 CONF, DC Display Configuration READ 4.2.5 Display Alarm Log READ 4.2.6 DATE, D Date READ/SET 4.2.7...
  • Page 67 Spectracom Corporation 8194B, 8195B, 8197B 4.3.1 Antenna Cable Delay The command, ACD, reads or sets the antenna cable delay value expressed in microseconds. The on-time point is offset by the delay value entered to compensate for antenna cable and in-line amplifier delays. The expected cable and amplifier delays are typically negligible.

  • Page 68: Alarm Timeouts

    8194B, 8195B, 8197B Spectracom Corporation 4.3.2 Alarm Timeouts The command ATx reads or sets the time out period allotted for tracking alarms AT1, AT2 and AT3. The default time out periods are AT1 = 1 minute, AT2 = 2 1/2 hours, and AT3 = 30 days.

  • Page 69: Battery Status (Option 02 Only)

    Spectracom Corporation 8194B, 8195B, 8197B 4.3.3 Battery Status (Option 02 only) The BA commands displays the status of the battery on units that is equipped with the internal battery backup. It will indicate one of three conditions. READY indicates the battery good and fully charged, CHARGING indicates the battery is OK, but is not yet fully charged, and REPLACE indicates the battery failed a test and should be replaced.

  • Page 70: Configuration

    8194B, 8195B, 8197B Spectracom Corporation The CA BAT command is used to reset just the Replace Battery lamp and the Minor Alarm relay. This command should be used only to reset the alarms after replacing a failed battery. Resetting the alarms without battery replacement will temporarily clear the alarm.

  • Page 71: Display Alarm Log

    Spectracom Corporation 8194B, 8195B, 8197B 4.3.6 Display Alarm Log An alarm log entry is made each time there is a change in the alarm relay status. The alarm log can be viewed by using the Display Alarm Log command DAL. The log contains a time and date stamp of when the alarm status change occurred, alarm relay status and active alarms.

  • Page 72: Date

    8194B, 8195B, 8197B Spectracom Corporation 4.3.7 Date The DATE command reads or sets the date of the Master Oscillator. To retrieve the current UTC date, issue the DATE command as shown below: Type: DATE <ent> -OR- D<ent> Response: DATE =...

  • Page 73: Display Frequency Measurements

    Spectracom Corporation 8194B, 8195B, 8197B 4.3.8 Display Frequency Measurements The average 24-hour frequency accuracy can be displayed using the DFM command. The frequency accuracy is determined by subtracting the accumulated phase drift measured at midnight from the previous midnight value. To display the last frequency...
  • Page 74 12. 24 hour phase measurement: occurs at 00:00:00 every day while in Phase Lock. 13. Phase adjustment: • Occur every 6 minutes for OCXO units. (Model 8194B and 8195B) • Occur every 20 minutes for Rubidium units. (Model 8197B) 14. Free Run Test: this is a factory test procedure to verify the stability of the oscillator.
  • Page 75 To retrieve the Oscillator Log issue the DOL command as shown below: Type: DOL<ent> DOL P <ent> Paged Output Response: SPECTRACOM CORPORATION GPS DISCIPLINED OSCILLATOR SOFTWARE VERSION 2.14 DATE: JULY 20, 2004 08:21:19 UNIT STARTED 12:47:07 2004-07-26 BAUD GENERATOR 1 = VERSION 2.02 BAUD GENERATOR 2 = VERSION 2.02 BAUD GENERATOR 3 = VERSION 2.02...

  • Page 76: Display Tracking Histogram

    8194B, 8195B, 8197B Spectracom Corporation 4.3.10 Display Tracking Histogram The Display Histogram command, DH, provides the tracking histogram. histogram records the number of satellites tracked each second. At the end of every hour a log entry is created and the counters start again. In Read Mode the command responds with the last four entries of the histogram and current histogram in process.

  • Page 77: Event Output

    Spectracom Corporation 8194B, 8195B, 8197B TIME= 14:00:00 DATE= 2004-03-24 0= 00000 1= 00000 2= 00000 3= 00000 4= 00000 5= 00000 6= 00000 7= 00067 8= 03430 9= 00103 10= 00000 11= 00000 12= 00000 Q= 03600 TIME= 15:00:00 DATE= 2004-03-24...

  • Page 78: Gps Signal Status

    8194B, 8195B, 8197B Spectracom Corporation 4.3.12 GPS Signal Status The GPS Signal Status command, GSS, lists the parameters used in qualifying the received GPS signal. This command is useful in verifying proper antenna placement and receiver performance in an installation.
  • Page 79 Spectracom Corporation 8194B, 8195B, 8197B The overall tracking and mode status is presented in the format shown below: TRACKING N SATELLITES GPS STATE = SSSSS DOP=##.# QUALITY = QQQQQ Where: Number of satellites currently tracking, 0…8. SSSSS Fix Mode, 2-D fix, 3-D fix, Pos-Hold, Other ##.#...
  • Page 80 8194B, 8195B, 8197B Spectracom Corporation (MSB) Bit 15: Reserved Bit 14:Reserved Bit 13: Reserved Bit 12: Reserved Bit 11: Used for Time Bit 10: Differential Corrections Available Bit 9: Invalid date Bit 8: Parity Error Bit 7: Used for Position Fix...

  • Page 81: Help

    ? <ent> - OR - H <ent> Response: SPECTRACOM CORPORATION GPS DISCIPLINED OSCILLATOR COMMAND LIST FOLLOWS (SET MODE MUST BE ON TO CHANGE PARAMETERS) CONF= DISPLAY THE CONFIGURATION <DC> DAL [P]= DISPLAY ALARM LOG <DP> DOL [P]= DISPLAY THE PERFORMANCE LOG, DFM= DAILY FREQUENCY MEASUREMENT DH [P]= DISPLAY THE HISTOGRAM LOG STAT= DISPLAY STATUS INFORMATION <DS>...

  • Page 82: Location

    8194B, 8195B, 8197B Spectracom Corporation 4.3.14 Location The command, LOC, is for reading or setting the current location of the receiver. This command displays the current latitude and longitude calculated by the GPS receiver. During initial installation it may speed up the time to first fix if the user inputs an approximate position using this command.

  • Page 83: Signature Control

    Spectracom Corporation 8194B, 8195B, 8197B 4.3.15 Signature Control The command SC reads or selects the Signature Control feature. Signature Control removes the front and rear panel 10 MHz outputs whenever a Major Alarm is asserted. The Master Oscillator is factory shipped with Signature Control off.

  • Page 84: Status Information

    8194B, 8195B, 8197B Spectracom Corporation 4.3.17 Status Information The STAT command provides the current operational status of the Master Oscillator. The Status Log includes a time and date stamp, oscillator status, GPS tracking status, position, battery status, temperature, cooling fan operation, and alarm status.

  • Page 85: Test Mode

    Spectracom Corporation 8194B, 8195B, 8197B NOTE: Receivers tracking GPS satellites cannot be set using this command. The received time data overwrites the set time. Example: Manually set the TIME 13:45:00. Type: SM ON <ent> Response: SET MODE ON Type: TIME 13:45:00 <ent>...

  • Page 86: Time Zone Offset

    8194B, 8195B, 8197B Spectracom Corporation 4.3.20 Time Zone Offset The TZO command reads or sets a Time Zone Offset value from UTC. This command allows all time stamps provided by the Master Oscillator to reflect local time. NOTE: Daylight saving time corrections are not automatically performed. DST/STD time change requires changing the Time Zone Offset value.

  • Page 87: Utc To Gps Time

    GPS receiver type. To retrieve version information, issue the VER command as shown below: Type: VER <ent> Response: SPECTRACOM CORPORATION GPS DISCIPLINED OSCILLATOR SOFTWARE VERSION 3.01 DATE: OCTOBER 21, 2004 11:51:47 UNIT STARTED 12:47:07 2004-11-21 BAUD GENERATOR 1 = VERSION 2.02 BAUD GENERATOR 2 = VERSION 2.02 BAUD GENERATOR 3 = VERSION 2.02...

  • Page 88: Frequency Offset

    8194B, 8195B, 8197B Spectracom Corporation 4.3.23 Frequency Offset The 1FO command allows the user to read or set the 10 MHz offset. The simulcast offsets are divided into two groups; Simulcast 1 (SC1) and Simulcast 2 (SC2). Simulcast 1 has offset steps sized for UHF as listed in Table 1-3. Simulcast 2 has offset steps sized for VHF Hi as listed in Table 1-4.
  • Page 89 Spectracom Corporation 8194B, 8195B, 8197B The frequency offset at the carrier frequency is determined by the formula: Δf c = F c x Δf s Δf c = carrier offset Where: F c = carrier frequency Δf s = offset of 10 MHz standard (from the tables)

  • Page 90: 1Pps Offset

    8194B, 8195B, 8197B Spectracom Corporation 4.3.24 1PPS Offset The relative phase of the recovered GPS 1PPS output can be offset using the 1PO command. The offset range is 0 - 1 second in .001 microsecond steps. In addition, the Data Clock and Data Sync output signals that are leading edge synchronized to the GPS 1PPS will follow the offset value.

  • Page 91: Command Structure

    Spectracom Corporation 8194B, 8195B, 8197B 4.4 RS-485 Command Structure The commands described here must conform to a specific command protocol. The protocol is shown in Table 4-5. FIELD SIZE DESCRIPTION Start Word 2 Bytes Unique characters <#> <$> used to...

  • Page 92: Command Descriptions

    8194B, 8195B, 8197B Spectracom Corporation 4.5 RS-485 Command Descriptions Table 4-6 provides an alphabetical listing of the RS-485 Command set. DESCRIPTION READ WRITE SECTION √ √ Antenna Cable Delay 4.5.1 Alarm Event History √ 4.5.2 Alarm Status Display √ 4.5.3 Alarm Time Out 1 √...

  • Page 93: Antenna Cable Delay

    Spectracom Corporation 8194B, 8195B, 8197B 4.5.1 Antenna Cable Delay This command is to read or set the antenna cable delay. Although this value is generally negligible, the 1PPS timing can be affected by the antenna cable delay. The default is 0. The maximum delay value is 000999.999 microseconds.

  • Page 94: Alarm Status

    8194B, 8195B, 8197B Spectracom Corporation 4.5.3 Alarm Status This command read Alarm Status. This is a short command designed to let the controller know if there are any alarms present. rast rastC where C = y or n indicating if there are alarm conditions present.
  • Page 95 Spectracom Corporation 8194B, 8195B, 8197B 4.5.6 GPS Signal Status The GPS Signal Status Command, rgcs, lists the parameters used in qualifying the received GPS signal. This command can be used to verify proper antenna placement and receiver performance. The total message length is 118 bytes.
  • Page 96 8194B, 8195B, 8197B Spectracom Corporation Example: HEX code word 08A0 translates to the following flags set: Bit 11: Used for Time Bit 7: Used for Position Fix Bit 5: Satellite Anti-Spoof Flag Set Qualified GPS: YES=Y, NO=N. The received quality of the GPS signal is continuously monitored. The criteria used in qualifying the GPS signal is listed below: •...
  • Page 97 Spectracom Corporation 8194B, 8195B, 8197B 4.5.8 Signal Selection This command reads the MUX timing outputs available on the rear panel. Rrsn rrsn # where # = 1 for 1.544 MHz outputs. 2 for 2.048 MHz outputs. 3 for a 1.544 MHz and a 2.048 MHz output.

  • Page 98: Table 4-7 Common Offset Values

    8194B, 8195B, 8197B Spectracom Corporation 4.5.11 Time Zone Offset This command allows the user to set the unit’s clock to local time. All time stamps will reflect the time zone offset. The default setting is 0000, which is UTC time.

  • Page 99: Table 4-8 Uhf Simulcast Offsets

    Spectracom Corporation 8194B, 8195B, 8197B 4.5.13 10MHz Offset This command allows the user to read or set the 10MHz Offset. The default is no offset selected. Table 4-8 and 4-9 lists the 10 MHz offset selections available when using the RS-485 COMM port.

  • Page 100: Table 4-9 Vhf Simulcast Offsets

    8194B, 8195B, 8197B Spectracom Corporation Offset Δf Offset Name Output Frequency Offset @ 150 MHz 2fo+1 +2.0E-8 10,000,000.200 Hz +3.0 Hz 2fo+2 +3.4E-8 10,000,000.340 Hz +5.0 Hz 2fo+3 +4.7E-8 10,000,000.470 Hz +7.0 Hz 2fo+4 +6.0E-8 10,000,000.600 Hz +9.0 Hz 2fo-1 -2.0E-8...

  • Page 101: Introduction

    Spectracom Corporation 8194B, 8195B, 8197B 5 Options And Accessories 5.1 Introduction This section describes the following options and accessories that are available for the Master Oscillator. • Internal Battery Backup – Option 02 • Internal Distribution Amplifier – Option 03 •...
  • Page 102 8194B, 8195B, 8197B Spectracom Corporation transparent to unit operation. If the battery falls below the minimum voltage set point, the test is discontinued and the Replace Battery alarm is asserted. Refer to Section 6, Service Information, for battery replacement instructions.
  • Page 103 Spectracom Corporation 8194B, 8195B, 8197B the CA BAT command or if the battery test on the second midnight after replacement is successful. 5.2.3 Clear Battery Alarm The Clear Battery Alarm command, CA BAT, resets the Replace Battery lamp and the Minor Alarm relay.
  • Page 104 A frequency distribution system may use Model 8140T Line Taps, Model 8140VT VersaTaps , Model 8140TA Line Extender Amplifiers or Model 8140MT MultiTaps. The following paragraphs describe each of these units. Contact Spectracom Sales Department at 585-321-5800, for additional information on these products.
  • Page 105 The Spectracom Model 8140MT MultiTap is a programmable frequency divider/buffer. Three outputs can be configured to the same frequency or set independently. When used as part of your Spectracom Distribution System it decreases the cost per output and allows future modifications as requirements change.
  • Page 106 8194B, 8195B, 8197B Spectracom Corporation Output divisors: Group A 1250 2500 For a 10 MHz input, the available outputs in MHz are: Group A 10.0 10.0 0.04 0.02 0.04 0.02 0.008 0.004 • Power Requirements: When driven by a Distribution Amplifier, the DC load equals three Line Taps.

  • Page 107: Figure 5-1 Line Tap Number And Distance Chart

    Spectracom Corporation 8194B, 8195B, 8197B 5.3.2 Design of Distribution Networks This section provides guidelines for using the Option 03 distribution outputs. In planning a system installation follow the guidelines listed below: 1. A maximum of 25 Line Tap loads may be driven from one base station. More than 25 loads are not permitted due to power supply limitations and impedance matching.
  • Page 108 03. They may be found in the ancillary kit that is packed with each unit when it leaves the factory. If any of these loads are lost, replacements may be purchased from Spectracom. The part number to order is 8140-0000-1000. Terminators may be placed on any unused distribution output connector to prevent loss.

  • Page 109: Figure 5-2 Typical Interconnection Diagram

    Spectracom Corporation 8194B, 8195B, 8197B 5. Wherever practical, permanently mount the Line Taps to a lab bench or wall nearby. This avoids their loss or misplacement and discourages people from disconnecting them, thus cutting off the signal to stations further down the line.

  • Page 110: Table 5-2 Option 11 Checklist

    8194B, 8195B, 8197B Spectracom Corporation 5.5 OPTION 07 – 5 MHZ outputs Option 07 changes the front and rear panel from 10MHz outputs to 5 MHz. These outputs provide a 750 mV rms sine wave into 50 ohms. Harmonic suppression is better than -30 dBc.

  • Page 111: Figure 5-3 Slides Assembly

    Spectracom Corporation 8194B, 8195B, 8197B Figure 5-3 Slides Assembly GPS Ageless Master Oscillator Instruction Manual 5-11...

  • Page 112: Figure 5-4 Data Sync Connector

    254 Hz. The rear panel Data Sync connector provides the CTCSS frequencies in RS-485 levels. These outputs are typically used with the Spectracom Model 1118 CTCSS Filter Board. The Model 1118 converts the applied RS-485 signal to a sine wave and features adjustable signal level and PTT delay with output inhibit capability.

  • Page 113: Table 5-4 Ctcss #1 And Ctcss #2 Frequency List

    Spectracom Corporation 8194B, 8195B, 8197B The 64kHz and 18kHz Data Sync outputs are derived from the 10MHz GPS disciplined oscillator. *The 64kHz signal is changed to 50kHz on units equipped with Option 06, 12.8 MHz outputs. The CTCSS #1 and CTCSS #2 outputs are derived from the 10MHz GPS disciplined oscillator and are triggered by the GPS 1PPS output.

  • Page 114: Figure 5-5 Data Sync Drivers

    8194B, 8195B, 8197B Spectracom Corporation 5.7.3 RS-485 Timing Signals The Data Sync timing signals are output in RS-485 levels. RS-485 is a balanced differential transmission requiring twisted pair cable. Cable lengths up to 4000 feet are possible when using cables specifically designed for RS-485 applications, like Belden 9844 or equivalent.

  • Page 115: Table 5-5 Ctcss Tones List - Ctcss #1 & #2

    Spectracom Corporation 8194B, 8195B, 8197B XZ (67.00Hz) WZ (69.33Hz) XA (72.00Hz) WA (74.33Hz) XB (77.00Hz) WB (79.66Hz) YZ (82.66Hz) YA (85.33Hz) YB (88.66Hz) ZZ (91.66Hz) ZA (94.66Hz) ZB (97.33Hz) 1Z (100.00Hz) 1A (103.66Hz) 1B (107.33Hz) 2Z (111.00Hz) 2A (114.66Hz) 2B (118.66Hz) 3Z (123.00Hz)
  • Page 116 1118-1, a rail mount version. This manual lists the pins and connectors for the 1118-2 first, then the pins and connections for the 1118-1 in brackets [ ]. The Spectracom CTCSS Tone Generator offers the following features: • Accuracy: Continuous self-calibrated to GPS provides ±1.0 x 10 frequency accuracy.

  • Page 117: Table 5-6 Ctcss Standard Frequency Chart

    Spectracom Corporation 8194B, 8195B, 8197B 5.7.6.1 STANDARD CTCSS FREQUENCY OUTPUT (CONTINUOUS TONE CONTROLLED SQUELCH SYSTEM) Signal: 67-254Hz sinewave derived from GPS disciplined oscillator with configurable 180-degree inverted “reverse burst” tone during delayed PTT output. See table 1-1 for tone frequencies and H1 jumper position.
  • Page 118 8194B, 8195B, 8197B Spectracom Corporation 5.7.6.2 Delayed PTT Output Signal: Digital Connector: 12 Pin Pluggable Header J4 Pin 9 [ or 6 Pin Header J6 Pin 6, ] Signal Level: Output structure is a Solid State Switch consisting of two MOSFETS (AC and DC operation) that present a high resistance when off and less than 0.4 ohms when on.
  • Page 119 Spectracom Corporation 8194B, 8195B, 8197B 5.7.6.4 Synchronized CTCSS Digital Inputs There are four possible CTCSS inputs labeled CTCSS #1, CTCSS #2, CTCSS #3 and CTCSS #4. The different CTCSS frequencies are set on the 8195B or the 8197B driving the CTCSS filter board assembly. They are input to the CTCSS filter assembly on connector J1 or J3.
  • Page 120 8194B, 8195B, 8197B Spectracom Corporation 5.7.6.7 Input Power DC Input: 7 to 20 VDC, 1 W Connector: 12 Pin Pluggable Header J4 pins 3 and 2 [ or 6 Pin Header J6 pins 3 and 4] Polarity: Positive on J4 pin 3 [ or J6 pin 4] 5.8 OPTION 16 –...

  • Page 121: Figure 5-6 Data Clock Connector

    Spectracom Corporation 8194B, 8195B, 8197B 5.9 OPTION 17 – CTCSS Outputs Three and Four Option 17 expands on Option 14 by replacing the 9.6 kHz and the 1 PPS outputs on the Data Clock connector with CTCSS #3 and CTCSS #4 outputs.

  • Page 122: Figure 5-7 Ds1 Framed All Ones Connector

    Spectracom Corporation 5.10 OPTION SP294 – DS1 Framed All Ones Special Request Number SP294 provides the Spectracom Models 8195B or 8197B with two DS1 Framed All Ones outputs. The 1544 kHz DS1 clock is derived from the 10 MHz GPS Disciplined Oscillator. Each DS1 output consists of a Tip (T), Ring (R) and Ground (G) connection on the rear panel terminal strip as shown in Figure 5-7.

  • Page 123: Figure 5-9 Programmable Jumper Locations

    Spectracom Corporation 8194B, 8195B, 8197B The unit is factory configured to provide a Blue Alarm when unlocked. To program the DS1 outputs for complete removal when unlocked, remove the shorting plug found on HDR5. Refer to Figure 5-9 to locate HDR5.

  • Page 124: Figure 5-10 E1 Framed All Ones Connector

    Spectracom Corporation 5.11 OPTION SP295 – E1 Framed All Ones Special Request Number SP295 provides the Spectracom Models 8195B or 8197B with two E1 Framed All Ones outputs. The 2048 kHz E1 clock is derived from the 10 MHz GPS Disciplined Oscillator producing clock accuracies of ±1 x10 for Model 8195B and ±1 x10...

  • Page 125: Figure 5-12 Programmable Jumper Locations

    Spectracom Corporation 8194B, 8195B, 8197B Figure 5-12 Programmable Jumper Locations SPECIFICATIONS Signal: E1 Framed All Ones Framing: CAS or CRC4 Multiframe; internal jumper selection. Factory configured for CRC4. Accuracy: Model 8195B: 24-hour average accuracy typically ±1 x 10 Model 8197B: 24-hour average accuracy typically ±1 x 10 Level: 3.0 Vpk into 100-ohms...
  • Page 126 8194B, 8195B, 8197B Spectracom Corporation 5-26 GPS Ageless Master Oscillator Instruction Manual...

  • Page 127: Battery Replacement

    Replace Battery lamp on and asserts a Minor Alarm. The unit will remain in alarm condition until the battery either again passes the daily test or is replaced. Replacement batteries can be ordered from Spectracom Sales Department at 585-321- 5800. Specify Part Number B00004. Batteries can also be obtained locally. Select a 12 Volt, 7.0 Amp/Hour sealed lead acid battery.
  • Page 128 8194B, 8195B, 8197B Spectracom Corporation Install the replacement battery into the holder and reinstall the holder cover. Reconnect the two-position plug to the front panel circuit board. Verify the plug is properly mated to the header to maintain the correct polarity.

  • Page 129: Ocxo Oscillator Adjustment (8194B And 8195B Only)

    Spectracom Corporation 8194B, 8195B, 8197B NOTE: The next two sections only apply to Models 8194B and 8195B that use an OCXO 10 MHz oscillator. It does not apply to the Model 8197B that has a Rubidium oscillator. For Rubidium oscillator adjustment, you will need to send the unit back to Spectracom’s technical support department.

  • Page 130: Ocxo Adjustment Procedure (8194B And 8195B Only)

    8194B, 8195B, 8197B Spectracom Corporation 6.3.1 OCXO Adjustment Procedure (8194B and 8195B ONLY) Perform the steps listed below to adjust the OCXO 10 MHz oscillator. NOTE: The oscillator must be powered for at least 1 hour prior to making this adjustment.
  • Page 131 Spectracom Corporation 8194B, 8195B, 8197B Subtract the lower limit frequency, F , from the upper limit frequency, F , to determine the pull range of the oscillator. This difference is entered as the Hertz Range Value. = HR Enter the hertz range value by sending the HR command as shown below: Type: HR XXX.XXX...
  • Page 132 8194B, 8195B, 8197B Spectracom Corporation GPS Ageless Master Oscillator Instruction Manual...

  • Page 133: Introduction

    A. Appendix A – Operation with Low GPS Quality A.1 Introduction The Spectracom Master Oscillator is often used to provide a reference to transmitters when precise frequency control is needed. In some installations, the GPS reception has been poor or intermittent, preventing reliable operation of the disciplined oscillator.

  • Page 134: Gps Qualifying Algorithm Selection

    Spectracom Corporation A.2 GPS qualifying algorithm selection The Spectracom Master Oscillator is equipped with three selectable GPS qualifying algorithms. The factory default algorithm is GPS Qualifying Algorithm GQA1. This algorithm places strict requirements on the received GPS signal. Every second the GPS signal is qualified and receives a pass/fail quality judgment.

  • Page 135: Gqa Command

    Spectracom Corporation 8194B, 8195B, 8197B A.3 GQA Command To select the GPS Qualifying Algorithm, a terminal or PC running terminal emulation software (Hyperterminal, Procomm Plus, etc.) will be needed to communicate with the RS-232 Comm port. Configure the terminal for ANSI emulation, 9600 baud, and a data structure of 1 start, 8 data, 1 stop and no parity.
  • Page 136 8194B, 8195B, 8197B Spectracom Corporation Type: DAL <ent> DAL P <ent> Paged Output An example of a Tracking Alarm is shown below: TIME= 18:18:04 DATE= 1999-06-28 STATUS CHANGE <TEMP= +36.5> COOLING FAN= OFF ALARM RELAYS: MAJOR= OFF MINOR= ON ACTIVE ALARMS: MINOR...

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