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Spectracom 8197 Instruction Manual

Gps ageless master oscillator
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GPS AGELESS MASTER OSCILLATOR
REVISIONS, IF ANY, ARE LOCATED AT THE END OF THE MANUAL
MODEL 8197
INSTRUCTION MANUAL
SPECTRACOM CORPORATION
95 Methodist Hill Drive, Suite 500
Rochester, NY 14623
PHONE
585-321-5800
FAX
585-321-5219
MANUAL REVISION A
December 2003

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Summary of Contents for Spectracom 8197

  • Page 1 MODEL 8197 GPS AGELESS MASTER OSCILLATOR INSTRUCTION MANUAL SPECTRACOM CORPORATION 95 Methodist Hill Drive, Suite 500 Rochester, NY 14623 PHONE 585-321-5800 585-321-5219 REVISIONS, IF ANY, ARE LOCATED AT THE END OF THE MANUAL MANUAL REVISION A December 2003...
  • Page 2 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.
  • Page 3 Antenna Installation ....................2-1 ANTENNA CABLE........................2-2 2.2.1 Cable Lengths ......................2-3 MODEL 8226 IMPULSE SUPPRESSOR ................2-3 MODEL 8227 GPS INLINE AMPLIFIER................2-4 MODEL 8197 PREPARATION FOR USE ................2-6 2.5.1 Antenna Connection ....................2-6 2.5.2 AC Power ........................2-6 2.5.3 DC Power ........................
  • Page 4 SECTION 3 OPERATION INTRODUCTION ........................3-1 FRONT PANEL FUNCTIONS....................3-1 3.1.1 Status Lamps......................3-1 3.1.1.1 Power ......................3-1 3.1.1.2 Tracking GPS ..................... 3-1 3.1.1.3 Oscillator Locked ..................3-1 3.1.2 Alarm Lamps ......................3-1 3.1.2.1 Major Alarm Lamp ..................3-2 3.1.2.2 Minor Alarm Lamp ..................3-2 3.1.3 Battery Lamps (Option 02 only)..................
  • Page 5 SECTION 4 SOFTWARE COMMANDS INTRODUCTION ........................4-1 RS-232 COMMANDS......................4-1 RS-232 COMMAND DESCRIPTIONS ................... 4-2 4.2.1 ANTENNA CABLE DELAY..................4-3 4.2.2 ALARM TIMEOUTS....................4-4 4.2.3 CLEAR ALARM ......................4-5 4.2.4 CLEAR BATTERY ALARM ..................4-6 4.2.5 CONFIGURATION ....................4-7 4.2.6 DISPLAY ALARM LOG .....................
  • Page 6 SECTION 5 OPTIONS AND ACCESSORIES INTRODUCTION ........................5-1 OPTION 02 INTERNAL BATTERY BACKUP............... 5-2 5.1.1 Battery Lamps ......................5-2 5.1.2 Option 02 Specifications.................... 5-3 OPTION 03 BUILT IN DISTRIBUTION AMPLIFIER ............. 5-3 5.2.1 System Components ....................5-3 5.2.1.1 Model 8140T Line Taps................5-3 5.2.1.2 Model 8140VT VersaTap Frequency Synthesizer ........
  • Page 7 TABLES TABLE 1-1 MODEL 8197 ANCILLARY KITS ..................1-3 TABLE 2-1 DC POWER CONFIGURATIONS ................... 2-6 TABLE 2-2 TYPICAL ANTENNA CABLE RESISTANCE VALUES..........2-11 TABLE 2-3 DEFAULT SETTINGS....................2-13 TABLE 3-1 RS-232 COMM PIN ASSIGNMENTS ................3-5 TABLE 3-2 TIMING OUTPUT PIN ASSIGNMENTS ................3-9 TABLE 3-3 DATA CLOCK PIN ASSIGNMENTS................3-11...
  • Page 8 ILLUSTRATIONS FIGURE 1-1 MODEL 8197 AGELESS MASTER OSCILLATOR ............1-1 FIGURE 2-1 ANTENNA INSTALLATION ..................... 2-2 FIGURE 2-2 MODEL 8226 IMPULSE SUPPRESSOR ................ 2-3 FIGURE 2-3 CONNECTOR ASSEMBLY INSTRUCTIONS ..............2-4 FIGURE 2-4 MODEL 8227 INLINE AMPLIFIER................... 2-5 FIGURE 2-5 CABLE GUIDELINES ...................... 2-5 FIGURE 2-6 DC POWER CONNECTOR .....................
  • Page 9 MODEL 8197 SECTION 1 GENERAL INFORMATION INTRODUCTION FEATURES WARRANTY INFORMATION AND PRODUCT SUPPORT MANUAL ERRATA AND SPECIAL DOCUMENTATION UNPACKING SPECIFICATIONS...
  • Page 10 A long-term averaging algorithm compensates for oscillator aging and temperature drift. The Model 8197 is ideally suited as a site master oscillator for communication systems. Typical transmitter applications include land mobile simulcast, SMR (Specialized Mobile Radio), paging simulcast, satellite/microwave communications links, cellular telephone, and broadcast television.
  • Page 11 Two-way simulcast frequency control is ±0.001Hz at 800 MHz. • Holdover: Rubidium oscillator provides excellent holdover characteristics. • Reliable World Wide Operation: The Model 8197 can receive and track up to eight satellites simultaneously. • Flexibility: Several power and output options are available to suite various applications.
  • Page 12 Retain the carton and packing materials in the event the carrier wishes to witness the shipping damage. Failing to report shipping damaging 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 13 Specifications This section contains specifications for the standard Model 8197 GPS Ageless Oscillator, Model 8225 GPS Antenna, Model 8226 Impulse Suppressor and Model 8227 Inline Amplifier. Specifications pertaining to Model 8197 options and related accessory items are found in Section 5.
  • Page 14 The following options are available for various Model 8197 applications: Option 03 Distribution Amplifier: Allows the Model 8197 to drive Spectracom distribution products. This option adds a 12 Volt DC offset to the rear panel Frequency Outputs. Option 06: Changes the Frequency Outputs and the front panel 10-MHz output to 12.8 MHz.
  • Page 15 RJ-11, rear panel. Signal Level: RS-485. Duty Cycle 50 ± 2%. Accuracy: Typically ±1.0 x 10 when locked to GPS, 24-hour average. Additional Outputs: Major alarm relay contacts; C, NO, NC are provided on this connector. Page 1-6 8197 Instruction Manual...
  • Page 16 0 to 1 second in 0.1 microsecond steps. The Data Clock 1PPS shall be synchronized within ±500 nanoseconds of other Model 8195A/8197 receivers having the same 1PO offset. The 9.6 kHz output is leading edge synchronized to within ±150 nanoseconds of the Data Clock 1PPS output.
  • Page 17 1PPS output can be offset from 0 to 1 second in 0.1 microsecond steps. The Data Clock 1PPS shall be synchronized within ±500 nanoseconds of other Model 8195A/8197 receivers having the same 1PO offset. The 64 kHz and 18 kHz outputs are not leading edge synchronized.
  • Page 18 AT1 Alarm is also asserted during start-up. 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 8197 Instruction Manual Page 1-9...
  • Page 19 1.5.10.2 Tracking Alarm Classifications Three configurable alarm tracking timeouts, AT1, AT2, and AT3, indicate how long the Model 8197 has been unable to track any satellites. Countdown timers are started whenever the receiver is not tracking satellites. As the period configured for each Alarm Timeout expires, the associated tracking alarm is asserted.
  • Page 20 NO, NC and Common Contact Rating: 30 VDC, 250 milliamps. 1.5.11 Communication Ports The Model 8197 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. 1.5.11.1 RS-232 Com Signal: RS-232C, DCE.
  • Page 21 Option 54, 3.0 Amp, 250V, Slo-Blo. Connector: 6-position terminal block, rear panel. 1.5.13 Mechanical Dimensions: 3.5H x 19.0W x 12.5D inches. (89H x 483W x 315D mm). Weight: 15 lbs.(6.8 kg) maximum. Shipping Weight: 20 lbs. (9.1 kg). Page 1-12 8197 Instruction Manual...
  • Page 22 Hose clamps (furnished) on vent pipe 1.5.16 Model 8226 Impulse Suppressor Connectors: Type N Female Turn On Time: 4 nanoseconds for 2 kV/ns Turn On Voltage: +7 V, -1 VDC Frequency Range: 1.2 to 2.0 GHz 8197 Instruction Manual Page 1-13...
  • Page 23 Section 1: General Information _____________________________________ VSWR: 1.1:1 or better Insertion Loss: 0.1 dB maximum 1.5.17 Model 8227 Inline Amplifier Connectors: Type N Female 20 ±3 dB Gain: ≤1.5:1 VSWR: 3 - 9 VDC, 7.5 ±1 milliamps Power: Page 1-14 8197 Instruction Manual...
  • Page 24 MODEL 8197 SECTION 2 INSTALLATION INTRODUCTION MODEL 8225 ANTENNA ANTENNA CABLE MODEL 8226 IMPULSE SUPPRESSOR MODEL 8227 INLINE AMPLIFIER MODEL 8195A PREPARATION FOR USE INITIAL OPERATION QUALIFYING THE INSTALLATION RECEPTION TROUBLESHOOTING FACTORY CONFIGURATION...
  • Page 25 30 dB of gain and requires +5 VDC at 27 milliamps. This is provided by the Model 8197 receiver over the antenna coax. Each antenna is terminated with a type “N” female connector. The Model 8225 features a compact weatherproof design measuring 3.5 inches in diameter.
  • Page 26 FIGURE 2-1 ANTENNA INSTALLATION ANTENNA CABLE Spectracom recommends LMR 400 type coax, such as Belden 8267, 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 27 20 dB. Cable attenuation of greater than 20 dB requires the use of a Model 8227 Inline Amplifier. MODEL 8226 IMPULSE SUPPRESSOR Spectracom recommends the use of an inline coaxial protector for all products with an outside antenna. Spectracom offers the Model 8226, Impulse Suppressor, to protect the receiver from damaging voltages occurring on the antenna coax.
  • Page 28 MODEL 8227 GPS INLINE AMPLIFIER An inline amplifier is required whenever GPS antenna cable lengths cause greater than 20 dB attenuation. Using Spectracom CAL7xxx or Belden 8267 coax, an amplifier is needed whenever antenna cable lengths exceed 200 feet. The Model 8227 GPS Inline Amplifier, shown in Figure 2-4, extends the maximum cable length to 400 feet.
  • Page 29 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 Belden 8267. Refer to Figure 2-3 for connector assembly instructions.
  • Page 30 2.5.2 AC Power The standard Model 8197 receives primary power from a 90 to 264 VAC 50/60 Hz power source. A detachable line cord is furnished in the ancillary kit. The supplied line cord is compatible with AC receptacles (NEMA 5-15R) commonly found in the United States and Canada.
  • Page 31 2.5.4 Chassis Ground The chassis ground lug allows the Model 8197 chassis to be connected to an earth ground in addition to the power line safety ground. Connecting the chassis to a single point ground system may be required in some installations to ensure optimum lightning protection.
  • Page 32 The resulting GPS quality and Position Fix Status are also included. A complete description of the GSS command can be found in Section 4 of this manual. Issue the GSS command as shown below. Type: GSS <ent> An example response is shown below: Page 2-8 8197 Instruction Manual...
  • Page 33 The satellite status flag code is found in the STAT column. Typically the STAT value is AA. If the receiver does not meet the minimum requirements described above, refer to Section 2.8 for troubleshooting assistance. 8197 Instruction Manual Page 2-9...
  • Page 34 3600 are considered acceptable. If the majority of the histograms show tracking less than four satellites or Q values less than 3000, the receiver may not provide reliable operation. Refer to Section 2.8.2 for recommendations. Page 2-10 8197 Instruction Manual...
  • Page 35 _____________________________________________ Section 2: Installation RECEPTION TROUBLESHOOTING Please review this section prior to calling the Spectracom Customer Service Department. If the reception problem can not be solved following the guidelines outlined in this section, please call for Customer Service at 716.381.4827.
  • Page 36 GPS jamming due to harmonics of the carrier. FACTORY CONFIGURATION Several of the Model 8197 outputs and operational parameters are configurable using the RS-232 communication port and set-up DIP switches. Table 2-3 lists the selectable parameters, factory default, and if it is command or switch selectable.
  • Page 37 Test Mode Command, TM Time Zone Offset No Offset Command, TZO One PPS Offset No Offset Command, 1PO RS-485 Address Switch selectable RS-485 Baud 9600 Switch selectable RS-485 Termination Switch selectable TABLE 2-3 DEFAULT SETTINGS 8197 Instruction Manual Page 2-13...
  • Page 38 MODEL 8197 SECTION 3 OPERATION INTRODUCTION FRONT PANEL FUNCTIONS REAR PANEL FUNCTIONS...
  • Page 39 This section describes the front and rear panel functions, and operational information for the Model 8197 GPS Ageless Oscillator. FRONT PANEL FUNCTIONS The front panel of the Model 8197 is shown in Figure 3-1. The paragraphs below describe the indicators and connectors found on the front panel. 3.1.1 Status Lamps 3.1.1.1...
  • Page 40 Output Fault: No output is detected from one or more of the four rear panel frequency outputs. The fault could be caused by a shorted cable, reflections due to an unterminated cable or Signature Control removed the outputs. Page 3-2 8197 Instruction Manual...
  • Page 41 ______________________________________________ Section 3: Operation FIGURE 3-1 MODEL 8197 FRONT PANEL 8197 Instruction Manual Page 3-3...
  • Page 42 Oscillator Adjust: Warns that oscillator is operating within 10% of the minimum or maximum control setting. The oscillator requires manual adjustment. Contact Spectracom Customer Service Department at 716-381-4827 to obtain a Return Authorization Number. GPS Tracking Timeout 1: The period of time (AT1) allotted for operation without tracking a minimum of four qualified satellites has expired.
  • Page 43 The RS-232 COM port does not require hardware handshaking. The Request to Send and Clear to Send signals are internally connected together, and the DSR signal is held high through a pull-up resistor. 8197 Instruction Manual Page 3-5...
  • Page 44 Delay command, ACD, and the One PPS Offset command, 1PO, descriptions found in Section 4.2 for additional information. REAR PANEL FUNCTIONS The rear panel of the Model 8197 is shown in Figure 3-3. The following paragraphs describe each of the rear panel functions. 3.2.1 GPS Antenna This type N connector is the antenna input to the GPS receiver.
  • Page 45 ______________________________________________ Section 3: Operation FIGURE 3-3 MODEL 8197 REAR PANEL 8197 Instruction Manual Page 3-7...
  • Page 46 10 MHz GPS disciplined oscillator. Major Alarm relay contacts are included on each output connector. The connector pin numbering is shown in Figure 3-4 and pin assignments listed in Table 3-4. FIGURE 3-4 TIMING OUTPUT CONNECTOR Page 3-8 8197 Instruction Manual...
  • Page 47 B Terminal (+) A Terminal (-) FIGURE 3-5 RS-485 OUTPUT The RS-485 output driver can provide a TTL-compatible clock signal when connected in a single-ended configuration. Connect as shown in Figure 3-6 for a TTL clock reference. 8197 Instruction Manual Page 3-9...
  • Page 48 9.6 kHz, 18 kHz and Major Alarm relay contacts. The connector is a 9-pin series D numbered as shown in Figure 3-7. Data Clock pin assignments are listed in Table 3-5. FIGURE 3-7 DATA CLOCK CONNECTOR Page 3-10 8197 Instruction Manual...
  • Page 49 485 line driver. Relative to RS-485 specifications the A Terminal (-) is negative with respect to the B Terminal (+) for a Binary 1. The A Terminal (-) is positive to the B Terminal for a Binary 0. 8197 Instruction Manual Page 3-11...
  • Page 50 3.2.5.1 RS-485 Address The Address switches give each Model 8197 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. Table 3-6 lists the RS-485 addresses and the corresponding DIP switch settings.
  • Page 51 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. 8197 Instruction Manual Page 3-13...
  • Page 52 (+) for a Binary 1 (MARK or OFF) state. The A terminal (-) is positive to the B terminal (+) for a Binary 0 (SPACE or ON) state. Figure 3-10 illustrates the relationship between the A and B terminals for the Transmit and Receive connections. Page 3-14 8197 Instruction Manual...
  • Page 53 64 kHz and Major Alarm relay contacts. The connector is a 15-Pin series D female numbered as shown in Figure 3-11. Data Sync pin assignments are listed in Table 3-8. FIGURE 3-11 DATA SYNC CONNECTOR 8197 Instruction Manual Page 3-15...
  • Page 54 ±400 nanoseconds of the Data Clock 1PPS output. The 64-kHz and 18-kHz Data Sync outputs are also derived from the 10 MHz GPS disciplined oscillator but are not leading edge synchronized to the GPS 1PPS output. Page 3-16 8197 Instruction Manual...
  • Page 55 A Major Alarm or power failure de-activates the relay causing continuity between common, Pin 10 and normally closed, Pin 12. The relay remains in alarm condition until the fault is corrected or reset by the clear alarm, CA, command. 8197 Instruction Manual Page 3-17...
  • Page 56 Pin 5, and the normally closed contact, Pin 6. When a Minor Alarm is asserted the relay is activated causing continuity between common, Pin 5, and the normally open contact, Pin 4. Page 3-18 8197 Instruction Manual...
  • Page 57 3.2.9 DC Power The DC Power connector provides primary or backup power to the Model 8197. On AC powered units, the DC Power connector allows connection of a backup power source. The backup source powers the oscillator and GPS Receiver whenever AC power is interrupted.
  • Page 58 3.2.10 AC Power The standard Model 8197 receives primary power from a 90 to 264 VAC 50/60 Hz power source. A detachable line cord is furnished in the ancillary kit. The supplied line cord is compatible with AC receptacles (NEMA 5 - 15R) commonly found in the United States and Canada.
  • Page 59 3.2.12 Chassis Ground The chassis ground lug allows the Model 8197 chassis to be connected to an earth ground in addition to the power line safety ground. Connecting the chassis to a single point ground system may be required in some installations to ensure optimum lightning protection.
  • Page 60 MODEL 8197 SECTION 4 SOFTWARE COMMANDS INTRODUCTION RS-232 COMMAND STRUCTURE RS-232 COMMAND DESCRIPTIONS RS-485 COMMAND STRUCTURE RS-485 COMMAND DESCRIPTIONS...
  • Page 61 RS-232 COMMANDS From the front panel RS-232 Com port the user may configure, control and monitor the 8197. Table 4-1 lists the RS-232 commands available to provide user access to the operation of the unit. These commands contain a hierarchy of Read, Set and Test modes.
  • Page 62 Terminate all command lines with the enter key. The enter key is represented by <ent>. The responses from the Model 8197 are in Italics. A new line is represented by the carriage return symbol <cr> . Configure the terminal for ANSI, 9600 baud and xon/xoff flow control.
  • Page 63 L = Cable length in feet. C = Constant derived from velocity of light; 1.016. V = Nominal velocity of propagation expressed as a decimal, ex. 66% = .66 Value is provided by cable manufacturer. 8197 Instruction Manual Page 4-3...
  • Page 64 SS = Seconds 00 …59 To Change the alarm time out periods place the unit in set mode and issue the ATx command as shown below: Type: ATx DDD HH:MM:SS Response: ALARM TIMEOUT x = DDD HH: MM:SS Page 4-4 8197 Instruction Manual...
  • Page 65 To reset the alarm relays, place the unit in Set Mode and issue the CA command as follows: Type: CA<ent> Example Response: TIME= 13:44:06 DATE= 2000-03-24 STATUS CHANGE <TEMP= +36.0> COOLING FAN= OFF ALARM RELAYS: MAJOR= OFF MINOR= OFF ACTIVE ALARMS: MAJOR FREQUENCY 8197 Instruction Manual Page 4-5...
  • Page 66 To clear the Replace Battery Alarm, place the unit in Set Mode and issue the CA BAT command as follows: TYPE: CA BAT<ent> Example Response: TIME= 12:34:14 DATE= 2000-03-24 STATUS CHANGE <TEMP= +36.0> COOLING FAN= OFF ALARM RELAYS: MAJOR= OFF MINOR= OFF ACTIVE ALARMS: NONE Page 4-6 8197 Instruction Manual...
  • Page 67 ANT CABLE DELAY= 000000.000 MICROSECONDS 10 MHZ OFFSET= NONE SIGNATURE CONTROL= OFF EVENT OUTPUT= ON RS-485 ADDRESS= 00 BAUD RATE= 9600 ALARM TIME OUT 1= 000 00:01:00 ALARM TIME OUT 2= 000 02:30:00 ALARM TIME OUT 3= 030 00:00:00 8197 Instruction Manual Page 4-7...
  • Page 68 COOLING FAN= OFF ALARM RELAYS: MAJOR= OFF MINOR= ON ACTIVE ALARMS: MINOR TRACKING ALARM 1 ANTENNA PROBLEM TIME= 13:00:39 DATE= 2000-03-24 STATUS CHANGE <TEMP= +43.5> COOLING FAN= OFF ALARM RELAYS: MAJOR= OFF MINOR= OFF ACTIVE ALARMS: NONE Page 4-8 8197 Instruction Manual...
  • Page 69 Section 4: Software Commands 4.2.7 DATE The DATE command reads or sets the date of the Model 8197. To retrieve the current UTC date, issue the DATE command as shown below: Type: DATE <ent> Response: DATE = YYYY - MM - DD Where: = Year value, 1999, 2000, etc.
  • Page 70 DRIFT = 0024 ns = 2.7E-13 2000-03-22 DRIFT = 0060 ns = 6.9E-13 2000-03-23 DRIFT = 0003 ns = 3.5E-14 2000-03-24 If the phase lock process was interrupted, the message "NOT AVAILABLE" will appear in the response. Page 4-10 8197 Instruction Manual...
  • Page 71 RAM contents, etc. 5. Start-up: occurs at power on. 6. First satellite found: occurs when the 8197 detects a satellite for the first time since power on. This entry does not happen after a loss of satellites. 7. 3D-Fix: This occurs when the GPS receiver has a 3D-Fix for a period of 1 minute.
  • Page 72 To retrieve the Oscillator Log issue the DOL command as shown below: Type: DOL<ent> DOL P <ent> Paged Output Example Response: SPECTRACOM CORPORATION GPS DISCIPLINED OSCILLATOR 8197 SOFTWARE VERSION 2.08 DATE: MAY 23, 2000 10:34:48 UNIT STARTED 13:56:53 2001-03-13 BAUD GENERATOR 1 = VERSION 2.02 BAUD GENERATOR 2 = VERSION 2.02 BAUD GENERATOR 3 = VERSION 2.02...
  • Page 73 Number of seconds the receiver tracked XXXXX the listed quantity of satellites since the beginning of the hour, 0...3600. Number of seconds since the beginning QQQQQ of the hour the GPS signal was qualified, 0…3600. 8197 Instruction Manual Page 4-13...
  • Page 74 5= 00000 6= 00000 7= 00061 8= 03539 Q= 03600 TIME= 13:54:18 DATE= 2000-03-24 TRACKING HISTOGRAM 0= 00000 1= 00000 2= 00000 3= 00000 4= 00000 5= 00000 6= 00000 7= 00008 8= 03249 Q= 03257 END OF LOG Page 4-14 8197 Instruction Manual...
  • Page 75 Section 4: Software Commands 4.2.11 EVENT OUTPUT The Model 8197 maintains logs on alarm conditions, satellite tracking, oscillator performance and corrections. Entries made to these logs are automatically output to the RS-232 port they are generated. The Event Output command, EO, can enable or disable the automatic output of these entries.
  • Page 76 The received quality of the GPS signal is continuously monitored. The criteria used in qualifying the GPS signal is listed below: Dilution of Precision, 0 ≤DOP<10 Vehicle Identification Number, VID>1 Channel Tracking Mode, MODE=08 Relative Signal Strength, STREN>40 Position Fix Bit Set, BIT7=1 Page 4-16 8197 Instruction Manual...
  • Page 77 Bit 3: Satellite Reported Inaccurate (>16 meters) Bit 2: Spare Bit 1: Spare (LSB) Bit 0: Parity Error Example: HEX code word A0 translates to the following flags set. Bit 7: Using for Position Fix Bit 5: Satellite Anti-Spoof Flag Set 8197 Instruction Manual Page 4-17...
  • Page 78 ? <ent> - OR - H <ent> Response: SPECTRACOM CORPORATION GPS DISCIPLINED OSCILLATOR 8197 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 79 LOC [N:S] [DD MM SS.SSS][E:W] [ DDD MM SS.SSS <ent> Where: N = North Latitude S = South Latitude DD MM SS.SSS = Latitude Degrees:Minutes:Seconds E = East Longitude W = West Longitude = Longitude Degrees:Minutes:Seconds DD MM SS.SSS 8197 Instruction Manual Page 4-19...
  • Page 80 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 Model 8197 is factory shipped with Signature Control off. To read the Signature Control configuration issue the SC command as follows: Type: SC <ent>...
  • Page 81 - OR - SET MODE OFF To place the unit into Set Mode: Type: SM ON <ent> Response: SET MODE ON To return the unit to Read Mode: Type: SM OFF <ent> Response: SET MODE OFF 8197 Instruction Manual Page 4-21...
  • Page 82 Section 4: Software Commands 4.2.17 STATUS INFORMATION The STAT command provides the current operational status of the Model 8197. 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 83 Section 4: Software Commands 4.2.18 TIME The command, TIME, reads or sets the time of the Model 8197. To retrieve the current UTC time, issue the TIME command as shown below: Type: TIME <ent> Response: TIME = HH:MM:SS Where: = UTC hours 00...23 = Minutes 00...59...
  • Page 84 To place the clock into Test Mode operation, issue the TM command as follows: Type: TM ON <ent> Response: TIME= 14:57:54 DATE= 2000-03-24 STATUS CHANGE <TEMP= +37.5> COOLING FAN= OFF ALARM RELAYS: MAJOR= ON MINOR= ON ACTIVE ALARMS: MAJOR IN TEST MODE - OR - TEST MODE= ON Page 4-24 8197 Instruction Manual...
  • Page 85 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 Model 8197 to reflect local time. NOTE: Daylight saving time corrections are not automatically performed. DST/STD time changes requires changing the Time Zone Offset value.
  • Page 86 This offset is due to leap seconds that have occurred since the GPS system was launched. To view the UTC to GPS offset, issue the U2G command as shown below: Type: U2G <ent> Sample Response: UTC TO GPS OFFSET= +013 SECONDS Page 4-26 8197 Instruction Manual...
  • Page 87 VER command as shown below: Type: VER <ent> Sample Response: SPECTRACOM CORPORATION GPS DISCIPLINED OSCILLATOR 8197 SOFTWARE VERSION 2.08 DATE: MAY 23, 2000 10:34:48 UNIT STARTED 12:47:07 2001-03-13 BAUD GENERATOR 1 = VERSION 2.02 BAUD GENERATOR 2 = VERSION 2.021 BAUD GENERATOR 3 = VERSION 2.021...
  • Page 88 1PO XXXXXX.XXX <ent> Where: XXXXXX.XXX = 000000.000 TO 999999.999 microseconds NOTE: It is not necessary to fill every digit space when entering an offset value. The offset value can range from 1 to 9 digits long. Page 4-28 8197 Instruction Manual...
  • Page 89 The descriptions that follow are for the Message field of the commands. When the first character of a command is ‘w’, this indicates the controller is writing information to the 8197. If the first character is ‘r’, the controller is reading information. The RS-485 Com port operates at 9600 baud. Character structure is 1 start, 8 data, 1 stop, and no parity.
  • Page 90 1PPS timing can be affected by the antenna cable delay. The default is 0. The maximum delay value is 999.999 microseconds. wacdXXXXXX.XXX where XXXXXX.XXX is a number in microseconds. wacdXXXXXX.XXX racd racdXXXXXX.XXX Page 4-30 8197 Instruction Manual...
  • Page 91 4.4.2 ALARM EVENT HISTORY This command is to read Alarm Events. The 8197 will respond with the most recent alarm event not yet returned by this command. When all events have been read, the most recent event is returned with the valid entry indicator set to ‘n’...
  • Page 92 Vehicle Identification Number, VID>1 Channel Tracking Mode, MODE=08 Relative Signal Strength, STREN>50 Position Fix Bit Set, BIT7=1 The GPS signal is qualified whenever four (4) or more satellites meet the above criteria for one (1) minute. Page 4-32 8197 Instruction Manual...
  • Page 93 SHORT STATUS This command gives a Short Status string. The controller can read this status information for alarm conditions. This command would generally be issued after the controller has polled the 8197 using the Alarm Status command. rsts rstsSDDDHHMMSSDDDHHMMSSDDDHHMMSSSDD.D32TFFCsssAO1Bss where S = number of satellites, DDD= days remaining T1, HHMMSS= time remaining T1, DDD= days remaining T3, HHMMSS= time remaining T3, DDD= days remaining T2, HHMMSS= time remaining T2, SDD.D= internal temperature,...
  • Page 94 4.4.11 TIME ZONE OFFSET This command allows the user to set the 8197’s clock to local time. All time stamps will reflect the time zone offset. The default setting is 0, which is UTC time. NOTE: The GPS time system has no indication for Daylight Savings Time, if the user wishes to have the time reflect DST they will need to change the time zone offset twice per year.
  • Page 95 MODEL 8197 SECTION 5 OPTIONS AND ACCESSORIES INTRODUCTION OPTION 02, INTERNAL BATTERY BACKUP OPTION 03, BUILT-IN DISTRIBUTION AMPLIFIER OPTION 06, 12.8-MHZ OUTPUTS OPTION 07, 5-MHZ OUTPUTS OPTION 08, 1-MHZ OUTPUTS OPTION 11, RACK MOUNT SLIDES OPTION 14, CTCSS OUTPUTS...
  • Page 96 OPTIONS AND ACCESSORIES INTRODUCTION This section describes the following options and accessories that are available for the Model 8197. • Internal Battery Backup - Option 02 • Internal Distribution Amplifier - Option 03 • Distribution Accessories: Model 8140T Line Taps, Model 8140TA Line...
  • Page 97 Section 5: Options and Accessories OPTION 02 INTERNAL BATTERY BACKUP Option 02 provides the Model 8197 with an internal battery backup power source. The battery powers the Rubidium oscillator and GPS receiver whenever AC power fails or is turned off. Battery backup shortens the recovery period to two hours when AC power returns by eliminating oscillator warm up and GPS reacquisition.
  • Page 98 OPTION 03 BUILT IN DISTRIBUTION AMPLIFIER Option 03 allows counters and synthesizers throughout a facility to use the GPS disciplined outputs from a Model 8197 as a common time base. Allowing equipment to share an accurate common time base eliminates the need to buy expensive, high stability time bases for each instrument or remove them from service for periodic calibration.
  • Page 99 Amplifier and one at the far end of the cable connected to the output of the Line Extender Amplifier. See the “Typical Interconnection Diagram” at the end of this section for an approved method of interconnection. Page 5-4 8197 Instruction Manual...
  • Page 100 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 101 1500 feet (457 m) on any one trunk line. If longer runs are required, you may: A. Locate the Model 8197 in the geographical center of the installation, running distribution lines in both directions and achieving a coverage of 3000 linear feet (914 m).
  • Page 102 Option 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 004490. Terminators may be placed on any unused distribution output connector to prevent loss.
  • Page 103 2048-kHz output. This changes the output frequency found on the 2048-kHz connector to 1.6 MHz. This change also affects the 64-kHz output found on the DB15 Data Sync connector. This output is changed from 64 kHz to 50 kHz. Page 5-8 8197 Instruction Manual...
  • Page 104 -30 dBc. OPTION 11 - RACK MOUNT SLIDES Option 11 allows the Model 8197 to be mounted in a 19-inch rack with slide-out capabilities. Table 5-2 lists the hardware supplied with Option 11. Verify that these items have been received. Much of the hardware supplied with this option will not be used.
  • Page 105 Section 5: Options and Accessories NOTE: Insert the intermediate section into the stationary section prior to rack installation. 3. Insert the receiver into the rack assembly. Secure the Model 8197 to the rack using the front panel mounting holes. FIGURE 5-3 SLIDES, OPTION 11...
  • Page 106 Ground Cable Shield Major - C Common Contact Major - NO Normally Open Major - NC Normally Closed Ground Cable Shield Ground Cable Shield Ground Cable Shield TABLE 5-3 OPTION 14 DATA SYNC PIN ASSIGNMENTS 8197 Instruction Manual Page 5-11...
  • Page 107 A Major Alarm or power failure de-activates the relay causing continuity between common, Pin 10 and normally closed, Pin 12. The relay remains in alarm condition until the fault is corrected or reset by the clear alarm, CA, command. Page 5-12 8197 Instruction Manual...
  • Page 108 In the following command descriptions, characters in Bold Italics are keys typed by the user. Terminate all command lines with the enter key. The enter key is represented by <ent>. The responses from the Model 8197 are in Italics. Configure the terminal for ANSI, 9600 baud, and xon/xoff flow control. The character structure is ASCII, 1 start, 8 data, 1 stop and no parity.
  • Page 109 6Z (168.00Hz) 6A (173.66Hz) 6B (180.00Hz) 7Z (186.33Hz) 7A (192.66Hz) M1 (203.66Hz) 8Z (206.66Hz) M2 (210.66Hz) M3 (218.00Hz) M4 (225.66Hz) 9Z (229.00Hz) M5 (233.66Hz) M6 (241.66Hz) M7 (250.33Hz) 0Z (254.00Hz) TABLE 5-5 CTCSS TONE LIST Page 5-14 8197 Instruction Manual...
  • Page 110 5Z (151.33Hz) 5A (156.66Hz) 5B (162.33Hz) 6Z (168.00Hz) 6A (173.66Hz) 6B (180.00Hz) 7Z (186.33Hz) 7A (192.66Hz) M1 (203.66Hz) 8Z (206.66Hz) M2 (210.66Hz) M3 (218.00Hz) M4 (225.66Hz) 9Z (229.00Hz) M5 (233.66Hz) M6 (241.66Hz) M7 (250.33Hz) 0Z (254.00Hz) 8197 Instruction Manual Page 5-15...
  • Page 111 MODEL 8197 SECTION 6 SERVICE INFORMATION INTRODUCTION BATTERY REPLACEMENT...
  • Page 112 GPS reception problems. BATTERY REPLACEMENT Option 02 provides the Model 8197 with an internal battery backup power source. Battery life expectancy is typically four years. The battery is tested daily to verify it is available for backup operation. If the battery fails the daily test, or if it remained in continuous charge mode for 2 days, a Replace Battery alarm is asserted.
  • Page 113 This completes the battery replacement procedure. The unit will require a two to three hour period to obtain oscillator lock to the GPS reference. The Battery Status lamp will change from Charging to Ready when the battery enters trickle charge mode. Page 6-2 8197 Instruction Manual...