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Spectracom Corporation

8194B, 8195B, 8197B

GPS Ageless Master Oscillator Instruction Manual

6-1

6

Service Information

6.1

Introduction

This section provides information on battery replacement and oscillator adjustment.
Refer to Section 2 for troubleshooting GPS reception problems. Please direct all
service calls to Spectracom customer service at:

585-321-5800

.

6.2

Battery Replacement

Option 02 provides the unit 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. This condition latches the front
panel 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. Power Sonic part number PS-1270,
Panasonic LC-R127R2P and Power Patrol SLA1075 are acceptable replacements.
Batteries may also be purchased from DigiKey, a large mail order electronics distributor.
Call 1-800 DIGIKEY, specify their part number P078-ND.

A Phillips screwdriver and a PC with terminal emulation software, i.e. HyperTerminal,
ProComm Plus, and a straight through (one to one) pinned DB9 RS-232 cable is
required. The PC is used to clear the Replace Battery alarm.

Set the terminal emulation program for 9600 baud, 8 data, 1 stop, no parity and
XON/XOFF flow control.

6.2.1 Battery Replacement Instructions

Turn off the rear Panel AC power switch.

Remove the top cover. Rack mounted units, unless equipped with Option 11, Rack
Mount Slides, must be removed. 12 screws secure the cover.

Disconnect the two-position battery cable from the front panel circuit board. Note the
orientation of the connector before removing it.

Remove four screws securing the cover of the battery holder assembly and then
remove the battery. Please note that it is a tight fit, carefully work the battery out.

Remove the battery cable from the old battery and connect to the new battery. Make
certain the red wire is connected to the positive battery terminal.

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Summary of Contents for 8194B

Page 1: ...OR MODEL 8194B 8195B 8197B INSTRUCTION MANUAL SPECTRACOM CORPORATION 95 METHODIST HILL DRIVE ROCHESTER NY 14623 PHONE 585 321 5800 FAX 585 321 5219 www spectracomcorp com Part Number 1132 5000 0050 Manual Revision B November 2005 ...

Page 2: ... 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 All other products are identified by trademarks of their respective companies or organizations All rights reserved ...

Page 3: ...on as to the claimed defect Spectracom products shall not be returned unless a return authorization number is issued by Spectracom Spectracom products must be returned with the description of the claimed defect and identification of the individual to be contacted if additional information is needed Spectracom products must be returned properly packed with transportation charges prepaid Shipping ex...

Page 4: ......

Page 5: ...andard Frequency Outputs 1 5 1 6 3 Ovenized Oscillator Frequency Stability 1 6 1 6 4 Rubidium Oscillator Frequency Stability 1 7 1 6 5 1PPS Output 1 7 1 6 6 1544 kHz Timing Outputs 1 8 1 6 7 2048 kHz Timing Outputs 1 8 1 6 8 Data Clock Timing Outputs 1 9 1 6 9 Data Sync Timing Outputs 1 9 1 6 10 Indicator Lamps 1 10 1 6 11 Alarms 1 10 1 6 12 Communication Ports 1 14 1 6 13 Input Power 1 14 1 6 14 ...

Page 6: ...Histogram 2 12 2 9 Reception Troubleshooting 2 13 2 9 1 No Reception 2 13 2 9 2 Low GPS Quality 2 15 2 10 Default Factory Configuration 2 15 3 OPERATION 3 1 3 1 Introduction 3 1 3 2 Front Panel Functions 3 1 3 2 1 Status Lamps 3 1 3 2 2 Alarm Lamps 3 1 3 2 3 Battery Lamps Option 02 only 3 4 3 2 4 RS 232 Com 3 4 3 2 5 10 MHz Output 3 5 3 2 6 1PPS Output 3 5 3 3 Rear Panel Functions 3 6 3 3 1 GPS An...

Page 7: ...te 4 8 4 3 8 Display Frequency Measurements 4 9 4 3 9 Display Oscillator Log 4 9 4 3 10 Display Tracking Histogram 4 12 4 3 11 Event Output 4 13 4 3 12 GPS Signal Status 4 14 4 3 13 Help 4 17 4 3 14 Location 4 18 4 3 15 Signature Control 4 19 4 3 16 Set Mode 4 19 4 3 17 Status Information 4 20 4 3 18 Time 4 20 4 3 19 Test Mode 4 21 4 3 20 Time Zone Offset 4 22 4 3 21 UTC To GPS Time 4 23 4 3 22 Ve...

Page 8: ...ecifications 5 3 5 3 Option 03 Built in Distribution Amplifier 5 3 5 3 1 System Components 5 4 5 3 2 Design of Distribution Networks 5 7 5 4 OPTION 06 12 8 MHZ outputs 5 9 5 5 OPTION 07 5 MHZ outputs 5 10 5 6 OPTION 11 Rack Mount Slides 5 10 5 7 OPTION 14 CTCSS Outputs One and Two 5 12 5 7 1 Data Sync Timing Outputs 5 12 5 7 2 Data Sync Alarm Contacts 5 13 5 7 3 RS 485 Timing Signals 5 14 5 7 4 RS...

Page 9: ...DC Backup Wiring 2 8 Figure 2 8 DC Power Connector 2 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 3 11 Figure 3 7 Single Ended Connection ...

Page 10: ...ock Pin Assignments 3 12 Table 3 6 Address Selection 3 14 Table 3 7 RS 485 COM Pin Assignments 3 15 Table 3 8 Data Sync Pin Assignments 3 17 Table 3 9 Alarm Operation 3 19 Table 3 10 DC Power Configurations 3 20 Table 4 1 Alphabetical List of RS 232 Commands 4 2 Table 4 2 Common Offset Values 4 22 Table 4 3 UHF Simulcast Offsets SC1 4 24 Table 4 4 VHF HI Simulcast Offsets SC2 4 24 Table 4 5 RS 485...

Page 11: ...s for oscillator aging and temperature drift The Spectracom Ageless Master Oscillator 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 Figure 1 1 Spectracom Ageless Master Oscillator ...

Page 12: ...194B Standard Features Oscillator Quartz S NA S Rubidium NA S NA Front Panel 1 10 MHz S S S 1 1 PPS S S S 1 RS 232 Comm Port S S S Rear Panel 4 10 MHz Output S S S 1 Timing Output 1544 kHz S S NA 1 Timing Output 2048 kHz S S NA 1 Data Clock Output including disciplined 1 PPS S S S 1 Data Sync Output S S NA 1 RS 485 Comm Port S S NA Software Features Simulcast Frequency Offset S NA S Fast Frequency...

Page 13: ...on our web site http www spectracomcorp com Technical support is available by telephone e mail or online Please direct any comments or questions regarding application operation or service to Spectracom Customer Service Department Customer Service is available Monday through Friday from 8 30 A M to 5 00 P M Eastern time Telephone Customer Service at 585 321 5800 In addition please contact Customer ...

Page 14: ...g 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 Remove the packing list from the envelope on the outside of the carton Check the packing list against the contents to be sure all items have been received including an instruction manual and ancillary ...

Page 15: ...0 minutes during initial installation or if the receiver has been moved to a new location Acquisition time is reduced to one minute on subsequent power cycles Acquisition Sensitivity 110 dBm to 137 dBm Optimum Gain Range 18 to 36 dB at receiver input Timing Accuracy 10 nanoseconds while in Position Hold mode 1 6 2 Standard Frequency Outputs Signal 10 MHz sine wave derived from GPS disciplined osci...

Page 16: ... 12 8 MHz Option 07 Changes the rear panel Frequency Outputs and front panel 10 MHz Output to 5 0 MHz 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 11 24 hour average when locked to GPS and no frequency offsets selected 1 x 10 10...

Page 17: ... x 10 12 100 seconds Recovery During a power failure the oscillator control value is retained and the connected standby supply provides power to the oscillator and GPS receiver At power on the disciplined oscillator returns to the set frequency plus any incurred aging Without standby power applied Rubidium lock 4 minutes 25 C Oscillator Lock 4 hours Retrace 5 x 10 11 Aging Rate Unit automatically ...

Page 18: ... MHz GPS disciplined oscillator Connector RJ 11 rear panel Signal Level RS 485 Duty Cycle 50 2 Accuracy 8195B 1 0 x 10 11 when locked to GPS 24 hour average no frequency offsets selected 8197B 1 0 x 10 12 when locked to GPS 24 hour average Additional Outputs Major alarm relay contacts C NO NC are provided 1 6 7 2048 kHz Timing Outputs Signal 2048 kHz derived from the 10 MHz GPS disciplined oscilla...

Page 19: ... synchronized within 500 nanoseconds of other Master Oscillator 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 The 18 kHz output is not leading edge synchronized Alarm Outputs Major alarm status is provided on this connector Under normal operation the alarm pin is ground and high impedance when a Major Al...

Page 20: ...tput to 50 kHz Option 14 CTCSS Outputs replaces the 33 1 3 Hz and 17 2 3 Hz signals with CTCSS 1 and CTCSS 2 respectively 1 6 10 Indicator Lamps Front panel status lamps when lit indicate the following Power Primary power source is connected and switched ON Tracking GPS Receiver is tracking at least four qualified GPS satellites Oscillator Locked Oscillator is disciplined to the received GPS signa...

Page 21: ... Unit has been manually placed in Test Mode operation from RS 232 communication port Free Run The automatic frequency control feature has been disabled for factory testing only Short Gate Gate time is shortened for test purposes Measurement resolution is reduced Minor Alarm A minor alarm is asserted when failures detected do not immediately affect output accuracy The alarm relays reset when the fa...

Page 22: ... four qualified satellites As the period configured for each Alarm Timeout expires the associated Tracking Alarm is asserted The alarm timeouts are configured via the RS 232 and RS 485 communication ports Timeout range is 1 second to 999 days Alarm tracking status is provided to the communication ports using the STAT and DAL commands AT1 Alarm Tracking Timeout 1 Period of time the receiver has not...

Page 23: ...rminal block rear panel Contacts NO NC and Common Contact Rating 30 VDC 2 Amps Data Sync Major Alarm Connector DB15 Female rear panel Contacts NO NC and Common Contact Rating 30 VDC 500 milliamps Data Clock Major alarm Connector DB9 Female rear panel Contact Rating 30 VDC 500 milliamps 1544 kHz Major alarm Connector RJ 11 rear panel Contacts NO NC and Common Contact Rating 30 VDC 250 milliamps 204...

Page 24: ... switch selectable Bit Rate 9600 baud Address 0 31 switch selectable Character Structure ASCII 1 start 8 data 1 stop no parity Message Format Start word source address destination address message length message check word stop word 1 6 13 Input Power AC Input 90 to 264 VAC 50 60 Hz 20 Watts for ovenized oscillator units 60 Watts for Rubidium unit Option 02 Internal Battery Backup requires an addit...

Page 25: ...Shipping Weight 20 lbs 9 1 kg Rack Mount EIA 19 front panel drilled for two standard rack units Optional Option 11 Rack Mount Slides 1 6 15 Environmental Operating Temperature 30 to 60 C Storage Temperature 40 to 85 C Humidity 95 R H non condensing 1 6 16 Agency Approval This device complies with part 15 class B of the FCC Rules Operation is subject to the following two conditions 1 This device ma...

Page 26: ... Specifications Assembled Length 24 inches 61 cm Housing Diameter 3 5 inches 8 9 cm Housing Material PVC Weight 1 3 lbs 60 kg Mounting Hose clamps furnished on vent pipe 1 6 17 3 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 VSWR 1 1 1 or better Insertion Loss 0 1 dB maximum Mounting Optional m...

Page 27: ...l 8225 features a compact weatherproof design measuring 3 5 inches in diameter 2 2 1 Antenna Installation The GPS antenna must be installed outdoors in a location where an unobstructed view of the sky exists Rooftops generally make good locations due to clear overhead sky with views to the horizon This type of location allows the antenna to see and track the maximum number of satellites throughout...

Page 28: ...lity temperature range UV resistance and attenuation characteristics Do not allow the antenna cable to be placed in standing water as water may permeate through the coax jacket over time On flat roof installations the coax can be suspended by cable hangers or placed in sealed PVC conduit Apply a weather proofing sealant or tape over all outdoor connections Installation of a surge protection device...

Page 29: ...ceed 12 dB Cable attenuations greater than 12 dB require the use of a Model 8227 Inline Amplifier 2 4 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 Voltages exceeding the impulse suppre...

Page 30: ...racket and copper paste Mount the grounding panel indoors preferably close to where the antenna coax enters the building and direct access to the system ground is available Refer to Figure 2 3 for installation guidelines The ground panel must be connected to a low impedance both low resistance and low inductance ground system to assure proper operation of the surge protection equipment To minimize...

Page 31: ...wn in connector diagram below Tools Required Sharp Knife Razor Blade Cable Cutter Soldering Iron and Solder Ruler Wire Cutters Scissors 5 8 Open End Wrench 11 16 Open End Wrench Multimeter Step 1 Cut the cable end squarely and place the nut washer and gasket onto the cable as shown Make certain the gasket s V groove is oriented towards the end of the cable Cut the cable jacket back to dimension A ...

Page 32: ... 0 Ω Measure the continuity between the center conductor and connector body It should be an open circuit Figure 2 4 N Connector Assembly Instructions 2 5 Model 8227 GPS Inline Amplifier An inline amplifier is required whenever GPS antenna cable lengths cause greater than 12 dB attenuation Using Spectracom CAL7xxx or LMR 400 coax an amplifier is needed whenever antenna cable lengths exceed 200 feet...

Page 33: ... with other cables Place the inline amplifier within 200 feet 10 dB cable loss of the antenna to optimize the signal to noise ratio Whenever possible install the inline amplifier indoors and after the impulse suppressor Connect the surge suppressor to the inline amplifier using the supplied 5 foot cable The amplifier can be installed outdoors providing care is taken to weatherproof the connections...

Page 34: ...AC module and a properly grounded power receptacle NOTE The Master Oscillator accepts the complete range of 90 to 264 VAC without a change in instrument setup DO NOT change the AC fuse or line voltage selector On AC powered units the DC power connector allows connection of a backup power source Backup keeps the unit in standby It is NOT operational The backup source powers the oscillator and GPS r...

Page 35: ...sources may be connected for improved system reliability Be certain to observe the polarity markings when connecting power The 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 NOTE Place the DC power switch in the OFF...

Page 36: ...to reach operational temperature and stabilize and discipline to GPS The Model 8197B may require up to 6 hours The OSC LOCK lamp turns on and the Major Alarm lamp turns off when the oscillator is disciplined to the GPS reference The unit will now operate in accordance with the specifications listed in this manual 2 8 Qualifying the Installation Typically the front panel Tracking GPS lamp illuminat...

Page 37: ...77 29 15 050 HEIGHT 00095 METERS QUALITY PASSED CHAN VID MODE STREN STAT 01 08 08 050 08A0 02 27 08 049 08A0 03 31 08 052 08A0 04 03 08 048 08A0 05 15 08 051 08A0 06 18 08 051 08A0 07 13 08 049 08A0 08 19 08 042 08A0 09 00 00 000 0000 10 00 00 000 0000 11 00 00 000 0000 12 00 00 000 0000 Tracking The receiver must track at least 4 qualified satellites to operate Typically the receiver shall track ...

Page 38: ...2 8 2 Tracking Histogram The Display Tracking Histogram command DH is used to evaluate the long term reception quality The tracking histogram records the number of satellites tracked and qualified every second At the end of the hour a log is created and the counters are restarted The command responds with the last four hourly entries and the histogram currently in process A complete description of...

Page 39: ... drops below 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 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 follo...

Page 40: ...n Test Mode to issue the GPS Reset command Issue the GPS Reset command RGPS as shown below Type TM ON ent The unit will respond with a message stating Test Mode has been enabled During Test Mode operation the Major and Minor alarms are asserted Type RGPS ent After an approximate 10 second delay the receiver responds with a reset status message Allow 20 minutes for the receiver to begin tracking sa...

Page 41: ... GPS quality conditions by selecting an alternate GPS qualifying algorithm Refer to Appendix A for additional information 2 10 Default Factory Configuration Several of the unit s 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 Refer to ...

Page 42: ...8194B 8195B 8197B Spectracom Corporation GPS Ageless Master Oscillator Instruction Manual 2 16 ...

Page 43: ... and qualified for one minute Oscillator Locked The green OSC LOCKED lamp is off during start up The lamp turns on when the standard oscillator is phase locked to the GPS reference Entering a new frequency offset an Alarm Timeout 2 AT2 or Frequency alarm turns this lamp off until oscillator phase lock is achieved 3 2 2 Alarm Lamps The Master Oscillator divides alarm conditions into two categories ...

Page 44: ... unable to communicate with the GPS receiver Test Mode Unit has been placed in TEST MODE operation Free Run While in Test Mode the automatic frequency control feature has been disabled Short Gate While in Test Mode gate time has been configured for 10 seconds measurement resolution is reduced 3 2 2 2 Minor Alarm Lamp This lamp turns on whenever a Minor Alarm condition is present The lamp turns off...

Page 45: ...Spectracom Corporation 8194B 8195B 8197B GPS Ageless Master Oscillator Instruction Manual 3 3 Figure 3 1 Spectracom Master Oscillator Front Panel ...

Page 46: ...s Option 02 only These lamps monitor the status of the optional internal battery backup Refer to Section 5 Options and Accessories for additional battery information Ready Lamp This green lamp is on when the battery is OK and fully charged Charging Lamp This yellow lamp is on when the battery is charging Replace Lamp This red lamp turns on and a Minor Alarm asserted when the battery has failed its...

Page 47: ...handshaking The Request to Send and Clear to Send signals are internally connected together and the DSR signal are held high through a pull up resistor 3 2 5 10 MHz Output This BNC connector outputs a 10 MHz sine wave signal derived from the disciplined oscillator The 10 MHz output can be user configured for simulcast paging Refer to the Frequency Offset command 1F0 found in Section 4 2 for additi...

Page 48: ...e harmonic suppression is 30 dB 3 3 2 1 Signature Control The Frequency Outputs may be placed under signature control Signature Control removes the outputs whenever a Major Alarm occurs The outputs return when the fault condition is cleared The unit is shipped with this feature disabled The Signature Control feature may be enabled using the front panel RS 232 Com port Refer to the Signature Contro...

Page 49: ...Spectracom Corporation 8194B 8195B 8197B GPS Ageless Master Oscillator Instruction Manual 3 7 Figure 3 3 Spectracom Master Oscillator Model 8195B and 8197B Rear Panel ...

Page 50: ...8194B 8195B 8197B Spectracom Corporation GPS Ageless Master Oscillator Instruction Manual 3 8 Figure 3 4 Spectracom Master Oscillator Model 8194B Rear Panel ...

Page 51: ...imulcast offsets are selected using software commands Refer to the 10 MHz Offset command 1F0 found in Section 4 for additional information Offset Name Offset Δfs Output Frequency Offset 450 MHz SC1 1 1 1E 9 10 000 000 011 Hz 0 5 Hz SC1 2 2 2E 9 10 000 000 022 Hz 1 0 Hz SC1 3 3 3E 9 10 000 000 033 Hz 1 5 Hz SC1 4 4 4E 9 10 000 000 044 Hz 2 0 Hz SC1 1 1 1E 9 9 999 999 989 Hz 0 5 Hz SC1 2 2 2E 9 9 99...

Page 52: ...or a complete description Option 03 Built in Distribution Amplifier Option 06 12 8 MHz Outputs Option 07 5 MHz Outputs Option 16 1PPS on the third and fourth rear panel frequency outputs 3 3 3 1544 kHz and 2048 kHz Timing Outputs Each of these RJ 11 receptacles provide an RS 485 Timing Output of the indicated frequency The output signals 1544 kHz and 2048 kHz are synthesized from the 10 MHz GPS di...

Page 53: ...erential transmission requiring twisted pair cabling Refer to Figure 3 6 for a schematic representation of the RS 485 output driver Relative to RS 485 specifications the A terminal Pin 2 is negative with respect to the B terminal Pin 1 for a Binary 1 The A terminal is positive relative to the B terminal for a Binary 0 1 2 3 B A B Terminal A Terminal Shield Figure 3 6 RS 485 Output The RS 485 outpu...

Page 54: ...until the condition causing the alarm is corrected or is reset by the clear alarm CA command Refer to section 3 2 2 1 for a complete description of Major Alarms 3 3 4 Data Clock Timing Outputs This connector provides RS 485 clock signals of one pulse per second 1PPS 9 6 kHz 18 kHz and Major Alarm relay contacts The connector is a 9 pin series D numbered as shown in Figure 3 8 Data Clock pin assign...

Page 55: ...on 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 Refer to Figure 3 9 for a schematic representation of an RS 485 line driver Relative to RS 485 specifications the A...

Page 56: ...0 0 0 0 16 0 0 0 0 1 1 1 0 0 0 0 17 1 0 0 0 1 2 0 1 0 0 0 18 0 1 0 0 1 3 1 1 0 0 0 19 1 1 0 0 1 4 0 0 1 0 0 20 0 0 1 0 1 5 1 0 1 0 0 21 1 0 1 0 1 6 0 1 1 0 0 22 0 1 1 0 1 7 1 1 1 0 0 23 1 1 1 0 1 8 0 0 0 1 0 24 0 0 0 1 1 9 1 0 0 1 0 25 1 0 0 1 1 10 0 1 0 1 0 26 0 1 0 1 1 11 1 1 0 1 0 27 1 1 0 1 1 12 0 0 1 1 0 28 0 0 1 1 1 13 1 0 1 1 0 29 1 0 1 1 1 14 0 1 1 1 0 30 0 1 1 1 1 15 1 1 1 1 0 31 1 1 1 1 ...

Page 57: ...ts Figure 3 10 RS458 COM Connector PIN SIGNAL NOTES 1 Transmit RS 485 A terminal 2 Transmit RS 485 B terminal 3 Receive RS 485 A terminal 4 Receive RS 485 B terminal 5 Ground Cable Shield 6 Ground Cable Shield Table 3 7 RS 485 COM Pin Assignments The rear panel DIP switch selects the RS 485 address and termination as described in previous paragraphs Transmitted characters are in ASCII form with a ...

Page 58: ...nection 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 Data Sync pin assignments are listed in Table 3 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 Figure 3 12 Data Sync Connector ...

Page 59: ...utputs changes the 64 kHz output to 50 kHz Option 14 CTCSS Outputs replaces the 33 1 3 Hz and 17 2 3 Hz signals with the selected CTCSS outputs 1 and 2 respectively Refer to Section 5 Options and Accessories for additional information on Options 06 and 14 The 64 kHz and 18 kHz Data Sync outputs are derived from the 10 MHz GPS disciplined oscillator The 17 2 3 Hz and 33 1 3 Hz outputs are derived f...

Page 60: ...ta Sync Drivers 3 3 8 Major Alarm Contacts Major Alarm relay contacts are found on Pins 10 11 and 12 of the Data Sync connector A Major Alarm is asserted whenever 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 The energized relay causes continuity between the c...

Page 61: ...ist Output Fault Adjust Oscillator Tracking Alarm 1 Replace Battery Low GPS Quality Antenna Problem Frequency offset or the unit is placed in Test Mode operation During normal operation the Minor Alarm relay is de activated This causes continuity between common 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 ...

Page 62: ... Figure 3 15 The DC power connector is shown in Figure 3 16 Figure 3 15 DC Backup Wiring DC power options allow operation from alternate power sources Table 3 10 lists the various DC power configurations available Power is 20 Watts for Model 8195B and 60 Watts for Model 8197B Power Option Nominal Voltage Input Range Fuse Option 52 12 VDC 11 1 16 5 VDC 10 0 A Option 53 24 VDC 22 1 33 1 VDC 6 25 A S...

Page 63: ...ce 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 Alternate type line cords may be obtained locally Connect the line cord to the rear panel AC module and a properly grounded power receptacle The AC power module is equipped with a power switch line voltage selector EMI filter...

Page 64: ... protection A separate earth ground is also recommended in installations where excessive noise on the power line degrades the unit s receiver performance 3 3 14 Battery Disconnect Switch Depressing this switch removes the backup battery power from the GPS receiver and ovenized oscillator The Battery Disconnect switch is operational only on units equipped with Option 02 and when AC power is removed...

Page 65: ...aster Oscillator command structure Read Mode is the base level and when in Read Mode the user may access standard commands From Read Mode the user may select to enter Test or Set Mode Set Mode allows the user to not only access standard commands but in addition allows them to make changes to certain functions Test Mode allows the user access to special test commands as well as all standard command...

Page 66: ... STAT DS Display Status Information READ 4 2 17 TIME T Time READ SET 4 2 18 TM Test Mode 4 2 19 TZO Time Zone READ SET 4 2 20 U2G UTC to GPS Time Offset READ 4 2 21 VER Version READ 4 2 22 1FO Frequency Offset READ SET 4 2 23 1PO One PPS Offset READ SET 4 2 24 Table 4 1 Alphabetical List of RS 232 Commands 4 3 RS 232 Command descriptions In the following command descriptions characters in Bold Ita...

Page 67: ...XXXXXX XXX 000000 000 to 000999 999 microseconds To enter a cable delay place the clock in Set Mode operation issue the ACD command as follows Type ACD XXXXXX XXX ent Where XXXXXX XXX 000000 000 to 000999 999 microseconds NOTE It is not necessary to fill every digit space when entering a delay value The delay value can range from 1 to 9 digits long The clock then responds with the antenna cable de...

Page 68: ...eiver is unable to reacquire qualified satellites within the assigned time out periods the expired time out alarm is asserted An AT1 alarm is classified as a Minor alarm AT2 and AT3 are Major alarms To read the current time out values issue the ATx command as follows Type ATx ent Where x 1 2 3 Example Response ALARM TIMEOUT x DDD HH MM SS Where x 1 2 3 DDD Days 000 999 HH Hours 00 23 Colon Separat...

Page 69: ...ttery status issue the BA command as follows Type BA ent Response BATTERY STATUS READY OR BATTERY STATUS CHARGING OR BATTERY STATUS REPLACE 4 3 4 Clear Alarm The Clear Alarm command CA resets the Major and Minor Alarm relays even though the fault conditions are still present If a new alarm condition arises the appropriate alarm relay will be reasserted The front panel alarm lamps are not reset by ...

Page 70: ... 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 4 3 5 Configuration The Configuration command CONF provides a listing of all user selectable parameters and their current values The RS 485 address and baud rate selection is made using the rear panel set up switches A...

Page 71: ...red alarm relay status and active alarms To retrieve the alarm log issue the DAL command as shown below Type DAL ent Example Response TIME 12 57 53 DATE 2000 03 24 STATUS CHANGE TEMP 43 0 COOLING FAN OFF ALARM RELAYS MAJOR OFF MINOR ON ACTIVE ALARMS MINOR ANTENNA PROBLEM TIME 12 58 54 DATE 2000 03 24 STATUS CHANGE TEMP 43 5 COOLING FAN OFF ALARM RELAYS MAJOR OFF MINOR ON ACTIVE ALARMS MINOR TRACKI...

Page 72: ...h value 01 to 12 01 January 04 April DD Day of the month 01 to 31 Hyphen To set the date place the clock in Set Mode then issue the DATE command as follows Type DATE YYYY MM DD ent Where YYYY MM DD As defined above The clock responds with the date message reflecting the date entered NOTE The date cannot be set on receivers tracking GPS satellites The set date is overwritten with the received date ...

Page 73: ...lay Oscillator Log The Oscillator Log is a compilation of the last 25 log entries made or approximately one hour s worth of data In Test Mode the number of entries is expanded to 1 278 or approximately 3 5 days worth of data Due to the large number of entries this command is available with a page parameter P This allows the log to be output one page at a time with an option to continue or exit aft...

Page 74: ...econds Once an initial 3D Fix is acquired these log entries are inconsequential unless all satellites are lost If a lot of 3D Fix entries are in the log there is a reception problem 8 Battery Check occurs at 00 00 00 every day or when initiated by the Test Mode command TB 9 Phase Calibration occurs at initial entrance to the phase process and every 15 hours after 10 Tight Phase Lock occurs shortly...

Page 75: ...37 5 PHASE ERROR 129 55 nSEC TIME 11 36 07 DATE 2004 03 24 D A B201 69 FREQ ERROR 1 00E 10 LONG GATE 10MHZ OFFSET NONE INTERNAL TEMP 37 5 FREQ CNT 10 000 000 001 TIME 11 40 43 DATE 2004 03 24 PHASE ADJUSTMENT AVG LEN 0168 TOTAL 00012001 DAC B1FE 69 TEMPERATURE 37 5 PHASE ERROR 104 44 nSEC MORE ANY QUIT ESC When in Test Mode the oscillator log can be sorted for a specific log entry type Each log en...

Page 76: ...ram is useful in verifying receiver and antenna performance Type DH ent OR DH P ent paged output The tracking histogram is output in the following format TIME HH MM SS DATE YYYY MM DD 0 XXXXX 1 XXXXX 2 XXXXX 3 XXXXX 4 XXXXX 5 XXXXX 6 XXXXX 7 XXXXX 8 XXXXX 9 XXXXX 10 XXXXX 11 XXXXX 12 XXXXX Q QQQQQ Where HH MM SS UTC time log was created YYYY MM DD Date log was created XXXXX Number of seconds the r...

Page 77: ... Q 00118 END OF LOG END OF LOG 4 3 11 Event Output The Master Oscillator maintains logs on alarm conditions satellite tracking oscillator performance and corrections Entries made to these logs are automatically output to the RS 232 port as they are being generated The Event Output command EO can enable or disable the automatic output of these entries The factory default is disabled To view the Eve...

Page 78: ...and mode status as well as a table containing individual satellite date Issue the GPS Signal Status command as shown below Type GSS ent OR DSS ent OR SS ent An example response is shown below TRACKING 08 SATELLITES GPS STATE POS HOLD DOP 00 0 LATITUDE N 43 07 01 942 LONGITUDE W 077 29 15 050 HEIGHT 00095 METERS QUALITY PASSED CHAN VID MODE STREN STAT 01 08 08 050 08A0 02 27 08 049 08A0 03 31 08 05...

Page 79: ...ted 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 The GPS signal is qualified whenever four or more satellites meet the above criteria for one minute Information on each satellite the receiver is currently tracking is presented in table form The table columns are described below C...

Page 80: ...e Accuracy as follows per para 20 3 3 3 1 3 ICG GPS 200 0000 0 0 00 URA 2 40 0001 1 2 40 URA 3 40 0010 2 3 40 URA 4 85 0011 3 4 85 URA 6 85 0100 4 6 85 URA 9 65 0101 5 9 65 URA 13 65 0110 6 13 65 URA 24 00 0111 7 24 00 URA 48 00 1000 8 48 00 URA 96 00 1001 9 96 00 URA 192 00 1010 10 192 00 URA 384 00 1011 11 384 00 URA 768 00 1100 12 768 00 URA 1536 00 1101 13 1536 00 URA 3072 00 1110 14 3072 00 U...

Page 81: ...YTHEPERFORMANCELOG DFM DAILYFREQUENCYMEASUREMENT DH P DISPLAY THE HISTOGRAM LOG STAT DISPLAY STATUS INFORMATION DS GSS GPS SIGNAL STATUS DSS SS DATE YYYY MM DD CURRENT DATE D TIME HH MM SS CURRENT TIME T U2G UTC TO GPS OFFSET TZO HH MM READ OR SET THE TIME ZONE LOC D DD MM SS sss D DDD MM SS sss CURRENT LOCATION 1PO XXXXXX XXX 1PPS OFFSET ACD XXX XXX ANTENNA CABLE DELAY 1FO SCn so TV sc 10MHZ OFFS...

Page 82: ...irst fix entering a new position using this command has no effect Also after initial installation the receiver will keep its current position in Non Volatile RAM so that on subsequent power cycles the unit will reach first fix much faster than at initial installation To view the current receiver location issue the LOC command as shown below Type LOC ent Response CURRENTLOCATION LATITUDE N430700 40...

Page 83: ...ture Control place the unit in Set Mode and issue the SC command as shown below Type SC ON ent Response SIGNATURE CONTROL ON OR Type SC OFF ent Response SIGNATURE CONTROL OFF 4 3 16 Set Mode This command is used to read or enter Set Mode operation As a safeguard the unit must be placed into Set Mode whenever operational parameters are entered The units times out of Set Mode and returns to Read Mod...

Page 84: ... 54 18 DATE 2000 03 24 OSCILLATOR STATUS LOCKED GPS SIGNAL QUALIFIED BATTERY STATUS READY INTERNAL TEMP 37 5 DEGREES C COOLING FAN OFF ALARM RELAYS MAJOR OFF MINOR OFF ACTIVE ALARMS NONE 4 3 18 Time The command TIME reads or sets the time of the Master Oscillator To retrieve the current UTC time or local time if TZO has been entered issue the TIME command as shown below Type TIME ent OR T ent Resp...

Page 85: ...t Mode and returns to Read Mode operation if no commands are issued for 15 minutes Major and Minor alarms are asserted whenever the clock is in Test Mode To read the Test Mode status ON or OFF issue the TM command as shown below Type TM ent Response TEST MODE ON OR TEST MODE OFF To place the clock into Test Mode operation issue the TM command as follows Type TM ON ent Response NOTE Placing the uni...

Page 86: ... Time Zone offset values for periods of Standard time and Daylight Saving time TIME ZONE STANDARD TIME October April DAYLIGHT SAVING TIME April October Atlantic 04 00 03 00 Eastern 05 00 04 00 Central 06 00 05 00 Mountain 07 00 06 00 Pacific 08 00 07 00 Table 4 2 Common Offset Values To read the current Time Zone Offset value issue the TZO command as shown below Type TZO ent Response Time Zone SHH...

Page 87: ...PS OFFSET 013 SECONDS 4 3 22 Version The VER command provides the software version levels of the main and baud generator programs Included in the response message is the time and date the unit was turned on and GPS receiver type To retrieve version information issue the VER command as shown below Type VER ent Response SPECTRACOMCORPORATIONGPSDISCIPLINEDOSCILLATOR SOFTWARE VERSION 3 01 DATE OCTOBER...

Page 88: ...tput Frequency Offset 450 MHz SC1 1 1 1E 9 10 000 000 011 Hz 0 5 Hz SC1 2 2 2E 9 10 000 000 022 Hz 1 0 Hz SC1 3 3 3E 9 10 000 000 033 Hz 1 5 Hz SC1 4 4 4E 9 10 000 000 044 Hz 2 0 Hz SC1 1 1 1E 9 9 999 999 989 Hz 0 5 Hz SC1 2 2 2E 9 9 999 999 978 Hz 1 0 Hz SC1 3 3 3E 9 9 999 999 967 Hz 1 5 Hz SC1 4 4 4E 9 9 999 999 956 Hz 2 0 Hz Table 4 3 UHF Simulcast Offsets SC1 Offset Name Offset Δfs Output Freq...

Page 89: ...imulcast Offset Group 1 or 2 s Sign positive or negative or o Offset 1 2 3 or 4 To remove a 10 MHz simulcast offset and return the unit to no offset operation place the unit in Set mode and issue the 1FO command as follows Type 1FO 0 ent Examples Configure the Master Oscillator 10 MHz outputs for a VHF 150 MHz simulcast offset of 7 Hz From Table 4 4 this offset value is equivalent to SC2 3 To ente...

Page 90: ...e synchronized The Data Sync leading edge synchronized outputs are 17 2 3 Hz and 33 1 3 Hz or CTCSS outputs 1 and 2 if Option 14 is present To read the 1PPS offset value issue the 1PO command as shown below Type 1PO ent Response 1PPS Offset 000000 00 Microseconds To select a 1PPS offset place the unit in Set mode and issue the 1PO command as follows Type 1PO XXXXXX XX ent Where XXXXXX XX 000000 00...

Page 91: ...m 1 to 502 bytes Message 1 to 502 Bytes 4 character commands plus parameters Check Word 2 Bytes Running sum including all bytes after the start word through the last message byte Stop Word 2 Bytes Unique characters cr lf used to synchronize with data stream Table 4 5 RS 485 Command Protocol All inputs via the RS 485 port must follow this format or they will be ignored The descriptions that follow ...

Page 92: ...1 aeh Alarm Event History 4 5 2 ast Alarm Status Display 4 5 3 at1 Alarm Time Out 1 4 5 4 at2 Alarm Time Out 2 4 5 4 at3 Alarm Time Out 3 4 5 4 cah Clear Alarm History 4 5 5 gcs GPS Signal Strength 4 5 6 loc Full location 4 5 7 rrsn Signal Selection 4 5 8 sts Short Status Display 4 5 9 tad Time and Date 4 5 10 tzo Time Zone 4 5 11 who Vendor Version 4 5 12 1fo Ten MHz Offset 4 5 13 1po One PPS Off...

Page 93: ...d as a decimal i e 66 66 Value is provided by cable manufacturer 4 5 2 Alarm Event History This command is to read Alarm Events The unit 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 event already read raeh raeh VHHMMSSsHHMMDDMMYYYYtNTFOCsssAOGBNL where V y or n...

Page 94: ...lites the timers start counting down If the timer reaches 0 before the receiver begins to track satellites again the alarm relay is activated In addition if Alarm Time out 1 occurs this is a minor alarm Alarm Time out 2 and Alarm Time out 3 are Major alarms Defaults are AT1 1 minute AT2 2 hours AT3 30 days watXDDDHHMMSS where X 1 2 or 3 indicating which time out watXDDDHHMMSS ratX ratXDDDHHMMSS 4 ...

Page 95: ... received signal The minimum acceptable signal level is 40 CCCC Channel status flag 0000 to ffff Convert the hexadecimal code word to binary to find the status flags set 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 Bit 6 Satellite Momentum Alert Fl...

Page 96: ...n The GPS receiver will automatically find its correct position but the time to first fix can be shortened by entering an approximate position The GPS receiver constantly calculates its position based on the satellites it is receiving Once the unit has acquired its first fix entering a new position using this command has no effect Also after initial installation the receiver will keep its current ...

Page 97: ...ellites If tracking satellite is greater than 8 it will be truncated to 8 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 3 y or n for T3 timed out 2 y n T2 timed out T y n test mode F y n free run F y n Frequency alarm oscillator failure C y n cpu alarm sss three major alarm spa...

Page 98: ...the time reflect DST they will need to change the time zone offset twice per year Table 4 7 lists the North American Time Zone offset values for periods of Standard time and Daylight Saving time TIME ZONE STANDARD TIME October April DAYLIGHT SAVING TIME April October Atlantic 0400 0300 Eastern 0500 0400 Central 0600 0500 Mountain 0700 0600 Pacific 0800 0700 Table 4 7 Common Offset Values 4 5 12 Wh...

Page 99: ... to 4 for the VHD frequency offsets w2foSX R1FO r1foSX or r2foSX depending on which offset is currently being applied If no frequency offset is being applied r1fo 0 will be returned If a frequency offset other than the ones in the UHF and VHF tables below is applied r1foEE will be returned Offset Name Offset Δfs Output Frequency Offset 450 MHz 1fo 1 1 1E 9 10 000 000 011 Hz 0 5 Hz 1fo 2 2 2E 9 10 ...

Page 100: ...ast Offsets 4 5 14 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 The Data Clock 1PPS and 9 6 kHz outputs are leading edge synchronized The Data Sync leadi...

Page 101: ... manual The input power options are Option 52 12 VDC input Option 53 24 VDC input Option 54 48 VDC input 5 2 Option 02 Internal Battery Backup Option 02 provides the Master Oscillator with an internal battery backup power source This option is only available on the Model 8195B product line The battery powers the 10 MHz OCXO and GPS receiver module whenever AC power fails or is turned off The prima...

Page 102: ... option permits even faster recovery when the following conditions are met The unit achieved Oscillator Lock before losing AC power The power outage was less than 2 hours The internal ambient temperature did not change by more than 10 C When AC power is restored the Frequency and AT alarms are turned off after one minute If the unit does not have any 10MHz frequency offsets entered it will begin t...

Page 103: ...s minimum 18 hours typical Recovery Time Power outage 2 hours and 10 C change with 3 D fix Frequency Alarm clears in 1 minute Oscillator Lock within 1 hour Recovery time for all other conditions is 2 hours Recharge Rate 20 hours maximum from a complete discharge Charge Current 500 milliamps maximum 10 milliamps float charge Battery Life 4 years typical 5 3 Option 03 Built in Distribution Amplifier...

Page 104: ...0 dB Hz 1 kHz from carrier for 10 MHz input to base station amplifier Line Tap Size 5 25 L x 2 63 W x 1 71 H inches 133 L x 67 W x 43 H mm Mounting hole pattern 4 75 x 1 75 inches 121 x 44 mm 5 3 1 2 Model 8140VT VersaTap Frequency Synthesizer The VersaTap is a single frequency synthesizer whose output is factory set to any frequency between 1 kHz and 16 MHz in 1 kHz increments and up to 20 MHz in...

Page 105: ...dditional 1500 feet 457 m of RG58 coaxial cable with Model 8140 Line Taps installed along its length Two DC isolated 50 ohm terminators must be used one at the input tee connector of the Line Extender 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 inter...

Page 106: ...1 0 1 0 1 0 0 5 0 2 0 1 0 2 0 1 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 Option 40 which is required for stand alone operation reduces the distribution load to one Line Tap equivalent and is required whenever output frequencies are below 100 kHz Maximum current is less than 150 mA MultiTap size 5 25L x 2 63W x 1 7...

Page 107: ...p Loads If more than 25 Line Tap loads are required you may Add a Model 8140 Frequency Distribution Amplifier The Model 8140 contains an internal power supply and will feed an additional 25 Line Tap loads A Line Tap is required typically 10 MHz to provide the input frequency source to the Model 8140 This Daisy Chaining may be continued indefinitely 2 Voltage drops and signal attenuation limit the ...

Page 108: ...50 ohm load that must be used at the far end Line taps are inserted along the distribution line by using the supplied input tee connector No branching or Y configurations may be used as this causes impedance mismatch on the line Anything other than a 50 ohm line impedance may cause reflections which can cancel the output waveform at the receiver triggering an output fault alarm Refer to the Figure...

Page 109: ...feet maximum 1500 feet maximum 1500 feet maximum Each line tap output may drive a counter or a synthesizer Any 10 MHz line tap may drive Model 8140 to drive an additional 25 more line tap loads 5 0 MHz 10 0 MHz 8140VT 1 544 MHz 8140VT 2 048 MHz 8140MT TTL DC Isolated 50 ohm terminator P N 004490 Terminate the end of each distribution line Figure 5 2 Typical Interconnection Diagram 5 4 OPTION 06 12...

Page 110: ...r support brackets and assorted hardware 1 Hardware pack containing PEM nuts and 10 32 x 1 2 truss head screws 1 Hardware pack containing 10 KEP nuts and 10 32 x 3 8 pan head screws Table 5 2 Option 11 Checklist Install Option 11 as illustrated in Figure 5 3 and as described below 1 Remove the chassis section from the right hand slide rail assembly The right hand assembly is designated with the le...

Page 111: ...Spectracom Corporation 8194B 8195B 8197B GPS Ageless Master Oscillator Instruction Manual 5 11 Figure 5 3 Slides Assembly ...

Page 112: ...Refer to section 5 7 6 for more information on the Model 1118 CTCSS 5 7 1 Data Sync Timing Outputs Option 14 replaces the Data Sync 33 1 3 Hz and the 17 2 3 Hz outputs with CTCSS 1 and CTCSS 2 outputs The Data Sync connector is a DB15 female numbered as shown in Figure 5 4 Option 14 Data Sync pin assignments are listed in Table 5 3 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 Figure 5 4 Data Sync Connector...

Page 113: ...tion on configuring the CTCSS outputs CTCSS FREQUENCIES Hz 67 00 69 33 72 00 74 33 77 00 79 66 82 66 85 33 88 66 91 66 94 66 97 33 100 00 103 66 107 33 111 00 114 66 118 66 123 00 127 33 131 66 136 66 141 33 146 33 151 33 156 66 162 33 168 00 173 66 180 00 186 33 192 66 203 66 206 66 210 66 218 00 225 66 229 00 233 66 241 66 250 33 254 00 Table 5 4 CTCSS 1 and CTCSS 2 Frequency List 5 7 2 Data Syn...

Page 114: ...ont panel RS 232 COM port The CTCSS Tone Control command CTC is used to read or set the configuration or provide a listing of all CTCSS frequencies available 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 unit are shown in Italics Configure the term...

Page 115: ...gure CTCSS 1 to provide a 74 33 Hz tone Type SM ON ent Response SET MODE ON Type CTC 1 WA ent Response CTCSS GENERATOR SETTINGS 1 WA 74 33Hz 2 XZ 67 00Hz 3 NOT PRESENT 4 NOT PRESENT Configure the remaining CTCSS generator as required To view the entire CTCSS code table issue the CTC command as shown below Type CTC TABLE ent Response CTCSS TABLE XZ 67 00Hz WZ 69 33Hz XA 72 00Hz WA 74 33Hz XB 77 00H...

Page 116: ...t to 00 zero zero Also the second CTCSS generator C3 and C4 can only output frequencies that are integers 67 00 72 00 are valid 69 33 is not Examples Set CTCSS 1 to 69 33 2 to 180 00 3 4 are not installed wctcWZ6B0000 Set CTCSS 1 to 136 66 2 to 127 33 3 to 100 00 and 4 to 254 00 wctc4Z3A1Z0Z 5 7 6 Model 1118 CTCSS The Model 1118 CTCSS Tone Generator is used in conjunction with the Model 8195B or 8...

Page 117: ...PTT hold or millisecond reverse burst Code Tone Freq Actual Tone Freq H1 Pos Code Tone Freq Actual Tone Freq H1 Pos Code Tone Freq Actual Tone Freq H1 Pos XZ 67 0 67 000 B 1B 107 2 107 333 B 6A 173 8 174 000 A WZ 69 3 69 333 B 2Z 110 9 111 000 B 6B 179 9 180 000 A XA 71 9 72 000 B 2A 114 8 115 000 B 7Z 186 2 186 333 A WA 74 4 74 333 B 2B 118 8 119 000 B 7A 192 8 193 000 A XB 77 0 77 000 B 3Z 123 0...

Page 118: ...s from the trailing edge of the PTT input factory set to 150 milliseconds Delayed PTT Operation CTCSS tones are gated by PTT the PTT input active immediately causes the PTT Output to go active PTT inactive will cause the PTT output to go inactive after the PTT delay The delay is factory set to 150 milliseconds 5 7 6 3 PTT Input Signal Digital CMOS levels Connector 12 Pin Pluggable Header J4 Pin 5 ...

Page 119: ... terminated with jumpers Use either jumper pair H6 and H7 for CTCSS 1 H8 and H9 for CTCSS 2 H10 and H11 for CTCSS 3 or H12 and H13 for CTCSS 4 to select one of the CTCSS inputs Signal RS 485 Connector DB15 male connector J1 pins 7 and 8 for CTCSS 1 pins 5 and 6 for CTCSS 2 or DB9 connector J3 pins 3 and 8 for CTCSS 3 pins 1 and 6 for CTCSS 4 Impedance 120 ohms or high impedance A jumper can indivi...

Page 120: ...set are changed to provide a 1PPS signal instead The settings and specification of the 1PPS outputs on the rear panel is identical to the one that is currently being provided on the front panel The specifications are as follows Signal 1PPS derived from the 10 MHz GPS disciplined oscillator Connector BNC female rear panel Signal Level TTL compatible into loads 100 ohms Pulse Width 200 milliseconds ...

Page 121: ...ted to whole frequencies e g 67 00 Hz but not 69 33 Hz See section 5 7 for further details on the CTCSS output and refer to tables 5 7 and 5 8 Figure 5 6 Data Clock Connector PIN SIGNAL NOTES 1 CTCSS 3 RS 485 B TERMINAL 2 18 KHZ RS 485 B TERMINAL 3 CTCSS 4 RS 485 B TERMINAL 4 MAJOR ALARM GROUND NORMAL 5 GROUND CABLE SHIELD 6 CTCSS 3 RS 485 A TERMINAL 7 18 KHZ RS 485 A TERMINAL 8 CTCSS 4 RS 485 A T...

Page 122: ...ction on the rear panel terminal strip as shown in Figure 5 7 Figure 5 7 DS1 Framed All Ones Connector The DS1 outputs are available with D4 or ESF Framing SP294 equipped units are factory configured for D4 Framing ESF Framing is enabled by moving the internal shorting plug on HDR3 as shown in Figure 5 8 Refer to Figure 5 9 for assistance in locating HDR3 Figure 5 8 Frame Selection Jumper The outp...

Page 123: ...unlocked remove the shorting plug found on HDR5 Refer to Figure 5 9 to locate HDR5 Figure 5 9 Programmable Jumper Locations SPECIFICATIONS Signal DS1 Framed All Ones Accuracy Model 8195B 24 hour average accuracy typically 1 x 10 11 Model 8197B 24 hour average accuracy typically 1 x 10 12 Framing D4 or ESF Internal jumper selection Factory configured for D4 framing Level 3 0 Vpk into 100 ohms Conne...

Page 124: ...amed All Ones Connector The E1 outputs are available with CRC4 Multiframe or CAS Multiframe SP295 equipped units are factory configured for CRC4 Multiframe CAS Multiframe is enabled by moving internal shorting plugs on HDR1 of the Framed All Ones generator board as shown in Figure 5 11 Refer to Figure 5 12 for Assistance in locating HDR1 Figure 5 11 Frame Selection Jumpers The outputs may also be ...

Page 125: ...e 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 11 Model 8197B 24 hour average accuracy typically 1 x 10 12 Level 3 0 Vpk into 100 ohms Connector Terminal strip ...

Page 126: ...8194B 8195B 8197B Spectracom Corporation GPS Ageless Master Oscillator Instruction Manual 5 26 ...

Page 127: ...12 Volt 7 0 Amp Hour sealed lead acid battery Power Sonic part number PS 1270 Panasonic LC R127R2P and Power Patrol SLA1075 are acceptable replacements Batteries may also be purchased from DigiKey a large mail order electronics distributor Call 1 800 DIGIKEY specify their part number P078 ND A Phillips screwdriver and a PC with terminal emulation software i e HyperTerminal ProComm Plus and a strai...

Page 128: ... will self clear after successfully completing the first battery test typically 48 hours Connect the PC to the front panel RS 232 Com port and issue the command CA BAT to reset the latched Replace Battery alarm lamp The Reset Battery Alarm command is a Set Mode command Place the unit in Set Mode by sending the following command Type SM ON ent The unit will respond with an acknowledgement that Set ...

Page 129: ...wo to three month warning before a control range end is reached On rare occasions an oscillator may experience a sudden shift in frequency causing an Adjust Oscillator and a Frequency Alarm When this occurs both Major and Minor alarms are activated The D A is set to a control range end unable to correct the oscillator frequency Frequency error shall exceed 1 x 10 8 This section describes the oscil...

Page 130: ... ON ent Response TIME 16 11 43 DATE 2000 03 27 STATUS CHANGE TEMP 37 0 COOLING FAN OFF ALARM RELAYS MAJOR ON MINOR ON ACTIVE ALARMS MAJOR IN TEST MODE ADJUST OSCILLATOR 5 Set the D A control voltage to its maximum value by sending the SHI command Type SHI ent Response D A FFFF 99 6 Remove the seal screw from the 10 MHz OCXO The oscillator is located near the center of the logic circuit board assem...

Page 131: ...e Hertz Range Value FHI FLO HR Enter the hertz range value by sending the HR command as shown below Type HR XXX XXX where XXX XXX Hertz Range Value Response Hertz Range XXX XXX D A C000 9 Return the unit to normal operation by taking it out of Test Mode Type TM OFF ent The oscillator adjustment procedure is now complete Replace the top cover and reinstall the unit The unit will require a two to th...

Page 132: ...8194B 8195B 8197B Spectracom Corporation GPS Ageless Master Oscillator Instruction Manual 6 6 ...

Page 133: ...ision or FM radiobroadcasts while operating within their frequency allocation can cause GPS jamming due to harmonics of the carrier Television interference presents a greater challenge due to higher output power typically 2 3 MW Table A 1 lists the potential problem television stations and their respective GPS harmonic CHANNEL HARMONIC 66 2nd 23 3rd 10 8th 7 9th 6 18th 19th 5 20th Table A 1 Televi...

Page 134: ...eshold A satellite is qualified for use whenever its Tracking Mode is set to 08 The number of satellites tracked and their current Tracking Model value can be seen using the GSS command Refer to Section 4 of this manual for a complete description of the GSS command GPS Qualifying Algorithm GQA3 initially begins similar to GPS Qualifying Algorithm GQA1 A minimum of four satellites with signal stren...

Page 135: ...de operation off as shown below Type TM OFF ent The unit shall respond with another Change in Status message Allow the receiver two to three hours to frequency lock the oscillator to GPS When the oscillator is disciplined to GPS the front panel OSC LOCK lamp turns on and the frequency and major alarms clear The unit may now be placed in service It is recommended to periodically monitor the recepti...

Page 136: ...IME 18 18 04 DATE 1999 06 28 STATUS CHANGE TEMP 36 5 COOLING FAN OFF ALARM RELAYS MAJOR OFF MINOR ON ACTIVE ALARMS MINOR TRACKING ALARM 1 Search the Alarm Log for the presence of Tracking Alarms noting the time and date of these occurrences An occasional Tracking Alarm 1 is considered acceptable The presence of Tracking Alarm 2 represents reception problems and is not acceptable ...

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