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Smiths TRAK Microwave 8835 Technical Manual

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TRAK Microwave Model 8835 GPS Clock
TECHNICAL MANUAL
(D001571)
MODEL 8835
GPS Clock
Revision 2
i

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  • Page 1 TRAK Microwave Model 8835 GPS Clock TECHNICAL MANUAL (D001571) MODEL 8835 GPS Clock Revision 2...
  • Page 2 TRAK Microwave Model 8835 GPS Clock Revisions REVISION DESCRIPTION DATE APPROVED 120119 R. Penabade Initial Release ERN-003879 140529 R. Penabade STATIC AWARENESS The 8835 Time and Frequency GPS Clock contains CMOS IC’s that can be damaged by electrostatic discharge during handling. The following practices minimize likelihood of CMOS IC damage: 1.
  • Page 3 TRAK Microwave Model 8835 GPS Clock Models 8835 Standard Module GPS Clock D001571 REV 2...

  • Page 4: Table Of Contents

    TRAK Microwave Model 8835 GPS Clock TABLE OF CONTENTS CHAPTER 1 INTRODUCTION Paragraph Page General Level of Coverage Organization of the Manual Functional Description Internal Oscillator Characteristics GPS Receiver Physical Description, Models 8835 Standard Module Physical Description, Models 8835 Extended Module Power Requirements 1-10 Environmental Characteristics...
  • Page 5 TRAK Microwave Model 8835 GPS Clock APPENDICES Appendix A Model 8835 Network Setup / Operation Appendix B GPS Antenna, Installation, and Cable Options Appendix C External AC/DC Power Supply Data Sheet LIST OF ILLUSTRATIONS Figure Page Model 8835 Time and Frequency Clock Model 8835 Functional Block Diagram Model 8835 Standard Module Outline Drawing Model 8835 Extended Module Outline Drawing...

  • Page 6: Chapter 1 Introduction

    TRAK Microwave Model 8835 GPS Clock CHAPTER 1 INTRODUCTION GENERAL This manual contains the description, installation, operation, and maintenance instructions for the Model 8835 Time and Frequency GPS Clocks. Table 1-1 describes differences of various model versions (dash numbers). It is intended to provide electronics personnel with information necessary to operate the instrument and to maintain it to the Line Replaceable Unit (LRU), in this case, the complete unit.

  • Page 7: Functional Description

    TRAK Microwave Model 8835 GPS Clock FUNCTIONAL DESCRIPTION The Model 8835 provides precise time and frequency outputs in small form factor packages. It finds applications in Base Station Synchronization, Simulcast systems; DAB / DTV, and other areas. Salient features include the following: ...

  • Page 8: Oscillator Characteristics

    TRAK Microwave Model 8835 GPS Clock Power Stat Antenna Ethernet RS-232 Primary Signals 1 PPS Microprocessor Control and Receiver Status Logic 5 MPPS COMPISTE + 15V Power Supply 10 MHz DC In Figure 1-1 Model 8835 Functional Block Diagram 1-5 OSCILLATOR CHARACTERISTICS The Model 8835 has a disciplined oscillator, with nonvolatile digital storage of its center frequency.
  • Page 9 TRAK Microwave Model 8835 GPS Clock Table 1-3 Model 8835 Signal Characteristics SIGNAL CHARACTERISTICS Waveform: Sinusoidal 10 MHz + 13 dBm (1 Vrms), ± 2 dB into 50Ω Level: Connector: BNC female 400 ± 1 s pulse, positive going edge on time Waveform: 1 PPS TTL into 50Ω...

  • Page 10: Gps Receiver

    TRAK Microwave Model 8835 GPS Clock GPS RECEIVER Frequency: L1 (1575.42 MHz) C / A code Channels: 50 channels, independent and continuous tracking Acquisition time: < 1 minutes, cold start External gain: 15 dB to 50 dB + 5 VDC (5 – 80 ma) Antenna power: Connector: TNC female...
  • Page 11 TRAK Microwave Model 8835 GPS Clock PHYSICAL DESCRIPTION, Model 8835 (Extended Module) Dimensions: 10.4" L x 4" W x 1.6" H Weight: < 1.5 lb Mounting: Nine #6-32 screw holes in base. Refer to Chapter 2 for mounting screw locations. Maximum screw length into base must not exceed 0.25 inches.

  • Page 12: Power Requirements

    TRAK Microwave Model 8835 GPS Clock POWER REQUIREMENTS The 8835 is supplied with an internal DC/DC converter for 48 VDC operation. The power input voltage range for the unit is shown on the product Part number / Serial number label. Power input floats with respect to ground, therefore can be connected to a positive or negative supply voltage.

  • Page 13: Installation

    TRAK Microwave MODEL 8835 GPS CLOCK CHAPTER 2 INSTALLATION 2-1 UNPACKING PROCEDURE The Model 8835 is packed for shipment in foam material. Accessories, such as manual, power cords, and mating connectors are contained in the same box as the Model 8835. Unpack the system as follows: a.
  • Page 14 TRAK Microwave MODEL 8835 GPS CLOCK Figure 2-2, Model 8835 (Extended Module) Mounting Screw Locations D001571 REV 2...

  • Page 15: Optional Rack Mount Kit

    TRAK Microwave MODEL 8835 GPS CLOCK OPTIONAL RACK MOUNTING KIT With the optional rack mount kit, the Model 8835 may be mounted in a standard 19-inch EIA electronics equipment rack. The total unit height is 1.75 inches (1U) and the depth is 12 inches. The rack mount tray is designed to house two units and optional AC/DC power supplies.
  • Page 16 TRAK Microwave MODEL 8835 GPS CLOCK Dual Ground Stud Figure 2-4, Model 8835-3M Rack Mount Illustration SIGNAL CONNECTIONS and INDICATORS Refer to Figure 2-2 and Table 2-1 for connector and indicator locations and descriptions. Connect all cables as required for system operation. Figure 2-5, Model 8835 Connectors and Indicators** D001571 REV 2...

  • Page 17: Mating Connector

    TRAK Microwave MODEL 8835 GPS CLOCK Table 2-1, Model 8835 Connectors and Indicators CHASSIS MATING FUNCTION CONNECTOR CONNECTOR 10 MHz output BNC, female BNC, male 1 PPS output BNC, female BNC, male Ethernet I / O port RJ-45, jack RJ-45. plug GPS antenna input and antenna + 5 VDC power TNC, female TNC, male...

  • Page 18: Breakout Cable Assembly

    TRAK Microwave MODEL 8835 GPS CLOCK BREAKOUT CABLE ASSEMBLY The RS-232 DE-9 female connector provides the RS-232 I/O signals along with the 5M MHz, COMPITE and Alarm relay. A breakout cable assembly is provided with each unit to provide BNC connectors for the 5M MHz and COMPOSITE and DE-9 female connector for the RS-232 I/O.

  • Page 19: Antenna Installation

    TRAK Microwave MODEL 8835 GPS CLOCK Table 2-3, DC IN (J6) Connector Wiring SIGNAL Ground - DCV (not ground referenced) + DCV (not ground referenced) Table 2-4, RS-232 (J7) Connector Wiring SIGNAL Alarm Relay (common) Tx data RS-232 I/O Rx data RS-232 I/O Alarm Relay (Normally Closed) Ground 5 MHz output...

  • Page 20: Connectors And Indicators

    TRAK Microwave MODEL 8835 GPS CLOCK CHAPTER 3 OPERATION GENERAL This chapter covers the operation of the Model 8835 including a description of panel connectors and indicators. CONNECTORS and INDICATORS Typical Model 8835 panel view is shown in Figure 3-1. Figure 3-1 Model 8835 Panel View All connectors and indicators are located on the front panel and mounting holes on the bottom.

  • Page 21: Remote Operation

    TRAK Microwave MODEL 8835 GPS CLOCK REMOTE OPERATION The Model 8835 can be setup and monitored remotely through the RS-232 or Ethernet port using Telnet or SSH. There are two modes that can be set; one is the “Local Echo” mode where each character that is input is echoed back to the host.
  • Page 22 TRAK Microwave MODEL 8835 GPS CLOCK Table 3-1 Request Commands List COMMAND DESCRIPTION DEFAULT RQBT Request BIT Status RQDR Request Oscillator DAC numeric value RQIR Request difference between internal 1 PPS and time reference RQLC Request time of unit lock / unlock RQLK Request 1 PPS ref locked status RQLN...
  • Page 23 TRAK Microwave MODEL 8835 GPS CLOCK Request Commands RQBT Request BIT Status Provides BIT status. Host sends: RQBT<CR> Model 8835 replies: GPS_FAIL (Y or N), FREQ_DROP (Y or N), ANT_FAIL (Y or N), OSC_CAL_FAIL (Y or N), PLL_UNLK (Y or N), RUB_UNLK (Y or N) <CR><LF> Note: RUB_UNLK (Y or N) applicable to Model 8835-3M only.
  • Page 24 TRAK Microwave MODEL 8835 GPS CLOCK RQLK Request internal 1 PPS reference locked status Provides time stamp of when internal oscillator locked or unlocked. Host sends: RQLK<CR> Model 8835 replies: RQLK NO LOCK SINCE POWERUP<CR><LF> RQLK FREE RUN SINCE YYYY,MM,dd:hh:mm:ss<CR><LF> RQLK LOCKED SINCE YYYY,MM,dd:hh:mm:ss<CR><LF>...
  • Page 25 TRAK Microwave MODEL 8835 GPS CLOCK RQSD Request Currently Visible Satellite Position and Tracking Status and Dilution of Precision (DOP) Values Host sends: RQSD <CR> Model 8835 replies: RQSD PRN sv, AZ=AAA, EL=EE, SN=SS.S,TRK=t<CR><LF> Current DOP = DDD.D<CR><LF> where: sv is the satellite number AAA is the azimuth in degrees EE is the elevation is degrees SS.S is the signal to noise ratio...
  • Page 26 TRAK Microwave MODEL 8835 GPS CLOCK Reset 0. This command performs a software reset. When issued the unit will not respond and will take approximately one minute to reinitialize. Host sends: RST<CR> Time of Day TOD command outputs time message once per second if turned ON or when polled if turned OFF. Time message is output within 1 millisecond after the rising edge of the 1 PPS.
  • Page 27 TRAK Microwave MODEL 8835 GPS CLOCK Setup Commands Set/Request user offset and antenna delay compensation This command provided the user to offset the GPS 1 PPS reference for antenna delay compensation and to offset the GPS 1 PPS from UTC. Request mode: Host sends: SDC<CR>...
  • Page 28 TRAK Microwave MODEL 8835 GPS CLOCK Set/Request DST dates This command enters day light savings time (DST) Spring and Fall change dates. Refer to Table 3-2 for factory default dates. Local standard time may be selected when DST is not used. Request mode: Host sends: SDD<CR>...
  • Page 29 TRAK Microwave MODEL 8835 GPS CLOCK 8835 replies SHLD uu.n<CR><LF> Where uu is microseconds (maximum value is TBD) n is hundreds of nanoseconds SJAM This command forces a jam-sync, aligning 1 PPS to the GPS reference. Jam-sync will only be performed if GPS reference is valid.
  • Page 30 TRAK Microwave MODEL 8835 GPS CLOCK SOFF Set/Request GPS minor time offset uncertainty. Request mode Host sends: SOFF<CR><LF> SOFF sxxx<CR><LF> where: s is the + or - sign xxx offset in nanoseconds (0 - 999) Set mode Host sends SOFF sxxx<CR> 8835 replies: SOFF sxxx<CR><LF>...
  • Page 31 TRAK Microwave MODEL 8835 GPS CLOCK Set/Request position source Request mode: Host sends: SPS<CR> 8835 replies: SPS m<CR><LF> Where: m - is an "N" if the receiver navigation solution is selected m - is a "NA" if the computed average position is selected and the average position computation is not complete m - is a "A"...
  • Page 32 TRAK Microwave MODEL 8835 GPS CLOCK Set/Request time mode This command selects UTC, GPS, or Local for all time outputs in the unit. Hours and minutes offset between time zones can be entered. If GPS is selected, the offset between GPS and UTC is updated automatically when tracking satellites.
  • Page 33 TRAK Microwave MODEL 8835 GPS CLOCK Set/Request UTC time (Optional). This command is never required but is provided to allow the unit to be used as a time code generator, without the need of a satellite. This command can also be used to request the current time. Warning: Time can not be set if GPS REF module is tracking satellites.

  • Page 34: Maintenance Philosophy

    TRAK Microwave MODEL 8835 GPS CLOCK CHAPTER 4 Maintenance 4.1 GENERAL The Model 8835 provides maintenance-free operation for the life of the unit. 4.2 MAINTENANCE PHILOSOPHY The Model 8835 is considered a complete Line Replaceable Unit (LRU) and is not intended to be serviced or repaired in the field.

  • Page 35: Replacement Parts List

    TRAK Microwave MODEL 8835 GPS CLOCK CHAPTER 5 Replacement Parts List GENERAL The replacement unit for the Model 8835 are listed in Table 5-1. Table 5-1 Model 8835 Replaceable Modules Part Number Description Model 8835 – X Complete Unit P001134 External AC / DC Power Supply P002220 Breakout Cable Assembly...
  • Page 36 TRAK Microwave Model 8835 GPS Clock APPENDIX A Model 8835 Network Setup / Operation D001571 REV 2...
  • Page 37 TRAK Microwave Model 8835 GPS Clock General The Model 8835 contains a network interface port that provides control and status of the unit using SSH, Telnet, and SNMP as well as a Network Time Server (NTS). Setup The network interface is configured through the command line interface using RS-232 I/O port or through the Ethernet port using Telnet or SSH.
  • Page 38 TRAK Microwave Model 8835 GPS Clock Trap FSU off Trap GPS off Trap FAULT off Trap DISTMOD off Trap PS off Trap LOGIN off Trap CFG off SYSLOG REMOTE MASK (7) LOG_DEBUG (6) LOG_INFO (5) LOG_NOTICE OFF (4) LOG_WARNING ON (3) LOG_ERR (2) LOG_CRIT (1) LOG_ALERT...
  • Page 39 TRAK Microwave Model 8835 GPS Clock The network interfaces have programmable disconnect and disable timers that expire if a connection is made to the interface but no activity has occurred for the specified timeout period. These timers can also be disabled and each interface is described as follows: SSH port does not have a disable timer but does have a disconnect timer which is the idisconn command.
  • Page 40 TRAK Microwave Model 8835 GPS Clock only IPV4 address that may set variables is 192.168.1.50. The only IPV6 address that may set variable is fec0::1234 and any IPV6 address that starts with fec0:0000:0000:0000 may retrieve SNMP data. In order to enable traps the trap must be turned on and the trap client configured. Example 2: 8835>SNMP trap CFG on trap LOGIN on FAULT on tc0 fec0::1222 The previous example turned on config, login and fault traps.
  • Page 41 TRAK Microwave Model 8835 GPS Clock Model 8835 Replies: 8835 will query for the username, old password (if user already exists), and new password (entered twice). Examples: Change password for existing user account ‘rifc’ 8835>PASSWD User: rifc Enter old password: trak8835 Enter new password: newpass Re-enter new password: newpass Password for user ‘rifc’...
  • Page 42 TRAK Microwave Model 8835 GPS Clock Change or Add User/Password Login to the remote interface through the Ethernet port (Telnet or SSH) is password protected. The default username/password is: Username: rifc Password: trak8835 Passwords for existing user accounts can be changed and new user accounts may be added using the PASSWD command: Host Sends: PASSWD<CR>...

  • Page 43: Simple Network Management Protocol (Snmp)

    TRAK Microwave Model 8835 GPS Clock SIMPLE NETWORK MANAGEMENT PROTOCOL (SNMP) The Model 8835 includes an SNMP agent that supports SNMPv1, SNMPv2 and SNMPv3. The SNMP agent includes MIB II as described in RFC-1213 and a TRAK private enterprise MIB. The private MIB provides full SNMP management and trap notification of the Model 8835.
  • Page 44 TRAK Microwave Model 8835 GPS Clock Agent Configuration The SNMP agent is best configured via the http interface. Turn on http; connect to the unit via its IP address. Log in. Then scroll down to the snmp settings box. SNMPv1 and SNMPv2 Configuration Scroll down to the SNMP configuration box and modify the desired settings.
  • Page 45 TRAK Microwave Model 8835 GPS Clock Creating a new user is best configured via the http interface. Connect via the http interface. Scroll down to an available user and add the user’s configuration and click save. Figure A-2 HTTP User Settings Edit Existing User Editing a user is best done via the http interface.
  • Page 46 TRAK Microwave Model 8835 GPS Clock Appendix B GPS Antenna, Installation, and Cable Options Application Note 3.3 October 2008 D001517 REV 2...

  • Page 47: Specifications

    TRAK Microwave Model 8835 GPS Clock Specifications Operating Frequency: 1575.42 MHz Filtering: Triple filter, -60 dB @ 1575.42, 50 MHz Gain: >30 dB, (35 dB typical) Noise Figure: 2.2 dB maximum Protection: 80V, IEC1000-4-5 Polarization: Right hand, circular Power supply voltage: L9A Type +4.5VDC to 15VDC L9N Type +5VDC, ...
  • Page 48 TRAK Microwave Model 8835 GPS Clock L1 – L2 GPS Antenna The L32B GPS Antenna receives both L1 and L2 carrier signals for the TRAK family of GPS SAASM synchronized systems. Specifications Radome color: Five colors available, refer Frequency: L1, 1.575 GHz, ± 10 MHz to Table 1 L2, 1.227 GHz, ±...
  • Page 49 TRAK Microwave Model 8835 GPS Clock Antenna Installation General One of three antenna types and a variety of coaxial cable types and lengths are available for every TRAK GPS system. Each antenna type requires a different assembly and mounting procedure. The antenna cable type and length depend on the distance between the antenna and the GPS receiver to maintain optimal gain.
  • Page 50 TRAK Microwave Model 8835 GPS Clock L1 Antenna TNC Connector Type (part number 1001661-131) This antenna is identified by the TNC female connector on the antenna base and a threaded mast adapter, see Figure 1. This antenna is used with the following TRAK model series: 8821, 8835, and 9000. This antenna operates over an input voltage range of +4.5 VDC to +15 VDC.
  • Page 51 TRAK Microwave Model 8835 GPS Clock L1 Antenna N Connector Type (part number 1001661-157) This antenna is identified by the N female connector on the antenna base and a mast adapter attached to the antenna base with four screws, see Figure 2. This antenna operates over an input voltage range of +5, ± 0.5 VDC.
  • Page 52 TRAK Microwave Model 8835 GPS Clock L1 – L2 Antenna N Connector Type (part numbers, refer to Table 1) This antenna is only to be utilized with TRAK SAASM GPS models and is available in several radome colors (refer to Table 1). It is identified by the TNC female connector on the antenna base and a mast adapter attached to the antenna base with four screws, see Figure 3.
  • Page 53 TRAK Microwave Model 8835 GPS Clock Coaxial Cable and Accessories Selection General 50 feet of RG-58 type coaxial cable is supplied as standard with every GPS model. If a length greater than 50 feet or non-RG-58 cable is required, options are available. A 20 dB line amplifier is available when using long cable runs.
  • Page 54 TRAK Microwave Model 8835 GPS Clock 2-1.2 Calculating Antenna System Gain As stated in paragraph 1-3, selecting the coaxial cable type and length it is very important to maintain external gain of 13 dB to 50 dB at the input to the GPS receiver. These values include 3 dB margin. Table 2 provides an example of how to calculate antenna system gain.
  • Page 55 TRAK Microwave Model 8835 GPS Clock GPS Line Amplifier Specifications Operating Frequency: 1.1 – 1.7 GHz Gain: 20 dB, minimum DC Pass through: Yes, for active antennas Noise Figure: < 3.5 dB Input / Output Impedance: 50 Reverse Isolation: 35 dB minimum Operating Voltage: 3.6 –...
  • Page 56 TRAK Microwave Model 8835 GPS Clock GPS Line Amplifier Installation General The GPS Line Amplifier provides necessary gain lost in installations requiring long coaxial cable runs. Its operational voltage, along with the antenna, is supplied by the GPS receiver. Installation The GPS Line Amplifier is not contained in a weather proof housing and therefore must be installed in a weather protected area.
  • Page 57 TRAK Microwave Model 8835 GPS Clock APPENDIX C External AC/DC Power Supply Data Sheet An optional 40 W AC/DC power supply is provided with the 8835. XP Power part number AEL40US15. TRAK part number P001134. The power supply data sheet is provided below. Note: Although the power supply operational temperature is rated from -20°C to +70°C, TRAK has tested and qualified the power supply to operate from -30°C to +60°C.
  • Page 58 TRAK Microwave Model 8835 GPS Clock D001571 REV 2...
  • Page 59 TRAK Microwave Model 8835 GPS Clock D001571 REV 2...

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