INSTRUCTION BOOK OPERATING INSTRUCTIONS WITH PARTS LIST THRULINE® WATTMETER HIGH-SPEED WATTCHER® RF-MONITORING SYSTEM SERIES 3170A © Copyright 1996 by Bird Electronic Corporation Instruction Book Part Number 920-3170AS Revision C Thruline® and Wattcher® are registered trademarks of Bird Electronic Corporation
LIMITED WARRANTY All products manufactured by Seller are warranted to be free from defects in material and workmanship for a period of one (1) year, unless otherwise specified, from date of shipment and to conform to applicable specifications, drawings, blueprints and/or samples.
Safety Precautions Safety Precautions The following are general safety precautions that are not necessarily related to any specific part or procedure and do not necessarily appear elsewhere in this publication. These precautions must be thoroughly understood and apply to all phases of operation and maintenance. KEEP AWAY FROM LIVE CIRCUITS Operating personnel must at all times observe general safety precautions.
SERIES 3170A WARNING STATEMENTS The following safety warnings appear in the text where there is danger to operating and maintenance personnel and are repeated here for emphasis. WARNING Do not use electrically conductive tools for calibration when the front panel is removed. Damage to the unit and or the possibility of electrical shock exists. WARNING Disconnect this unit from ac power source before any disassembly for repair or replacement procedures. The potential for electrical shock exists.
About This Manual About This Manual This instruction book covers the series 3170A. Models covered are: 3170A 3170A200 3170A300 3171A 3171A020 3172A 3173A This instruction book is arranged so that essential information on safety is contained in the front of the book. Reading the Safety Precautions Section before operating the equipment is strongly advised. The remainder of this Instruction Book is divided into Chapters and Sections. Figures and tables are numbered sequentially within each chapter.
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Table of Contents Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii Series 3170A Warning Statements . . . . . . . . . . . . . . . . . . . . . iv Series 3170A Caution Statements . . . . . . . . . . . . . . . . . . . . . . iv About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . v Introduction General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Purpose and Function. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Specifications .
Sales / Repair Facilities . . . . . . . . . . . . . . . . . . . . . . . . 5-1 Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 Troubleshooting . . . . . . . . . . . . . . . . . .
Chapter 1 Introduction General This publication refers to the Model 3170A which is a member of the Bird Model 3170A Series of High Speed Wattcher RF Monitors. Models included in the series are listed in table 1-1. All models will generally be referred to as a Wattcher unit throughout this manual. The information in this instruction book pertains to all models except noted differences referred to in the text and in the Difference Data Sheets (see Appendix A).
Bird Series 3170A High-Speed Wattcher RF Monitoring System Specifications Impedance Power Range Models 3170A, 3170A200, 3170A300, 3172A, 3173A Model 3171A Model 3171A020.
- Functional Description Enclosures The Wattcher Monitor’s internal circuitry and analog meters are enclosed in separate aluminum housings. These housings are mounted to a standard 19 inch panel for rack mount applications. Front Panel Figure 1-1 Front Panel 1 Forward Monitor Active LED—Indicates forward power is being monitored and an error condition will be indicated upon failure. Trip LED—Indicates error condition has occurred.
Bird Series 3170A High-Speed Wattcher RF Monitoring System Rear Panel Figure 1-2 Rear Panel 1 AC Receptacle Provides a means of supplying ac line power to Wattcher control unit. 2 Line Voltage Selector Switch Determines line voltage operation. 3 AC Line Fuse 1/16A at 250V slow-blow fuse, provides circuit protection from excessive surge in line power or in the event of component failure. 4 Meter Connections J3—Connector for front panel main meters. Can also be used to connect remote meters.
- Outline Drawings Figure 1-3 Models 3171A, 3172A, & 3173A 1-5
Bird Series 3170A High-Speed Wattcher RF Monitoring System Figure 1-4 Models 3170A, 3170A200, & 3170A300 1-6
Chapter 2 Theory of Operation Input Signal Direct current signals representing operating power levels are brought into the RF monitor from the sensing elements through the rear panel jacks J1 and J2. These currents are shunted to ground through 1400 ohm resistors. The voltage developed across these resistors is amplified by a pair of operational amplifiers to approximately one volt (meter full scale).
Bird Series 3170A High-Speed Wattcher RF Monitoring System Operations The output of the confirm comparator goes directly to the confirm output drive transistors. The output of the reflected comparator goes directly to the alarm circuitry and to the reflector monitor tripped LED latch. The output of the forward comparator is gated by the activate forward monitor signal AFM before going to the alarm circuitry and LED latch.
Chapter 3 Preparation for Use General The series 3170A High-Speed Wattcher RF Monitoring System was designed for indoor use. This section contains information on unpacking and inspection; and preparing the Wattcher Unit for use. Unpacking and Inspection 1. Carefully inspect shipping container for signs of damage. If damage is noticed, do not unpack the unit. Immediatly notify the shipping carrier and Bird Electronic Corporation. 2. If container is not damaged, unpack the unit.
Bird Series 3170A High-Speed Wattcher RF Monitoring System Models 3171A, 3171A020, 3172A, and 3173A. 4. Connect the ac power cord from the Wattcher unit to an appropriate source. Make dc power connections if needed. 5. Secure the panel to the rack with appropriate fasteners. 1. Insert the line section in the coaxial RF transmission line. Connect the dc cable to the line section and run the dc cable to the rack console unit. 2.
- 2. Set the CALIBRATE/OPERATE switch to the calibrate position (to the left). Figure 3-2 Controls and Indicators 1. 2. 3. 4. 5. 6. 7. Adjust Set-points Calibrate/Operate Switch Forward Reference Adjustment Potentiometer Reflected Reference Adjustment Potentiometer Forward Set Point Potentiometer Reflected Set Point Potentiometer Confirm Set Point Potentiometer Forward Monitor Active Delay Dip Switch 1.
Bird Series 3170A High-Speed Wattcher RF Monitoring System Active Forward Monitor Setup Internal circuitry sets Active Forward Monitor (AFM) input to a high state. This inhibits monitoring of forward power on transmission line. To monitor forward power, follow the steps below. 1. Connect AFM input to ground by hardwiring terminal strip position 10 (AFM input) to position 7 (ground). 2. Select the appropriate delay (see table 3-1).
- Remote Meter Cable Assembly Remote meters can be connected to J4. The following instructions are provided for assembling cables for remote meter mounting. Cable recommended is Belden number 8208, 18 AWG braided shield wire. Bird p/n is 5-704. Required connector plug is Bird p/n 5-665. Figure 3-4 Remote Meter Cable 1. Cut cable to desired length. 2. Strip and tin wires to lengths as shown. 3. Disassemble connector and assemble the plug section on the cable.
Bird Series 3170A High-Speed Wattcher RF Monitoring System 3-6
Chapter 4 Operating Instructions General When the unit is installed and connected to a transmitter for remote monitoring, metering, or external alarms and functions as your installation requires, operator attention is not required. The equipment will completely monitor a transmitter’s operation. The only time operating personnel will be necessary is to reset the unit if it has not been wired for automatic or remote reset.
Bird Series 3170A High-Speed Wattcher RF Monitoring System 4-2
Chapter 5 Maintenance With basic care, the series 3170A should provide many years of trouble free operation. This section contains operator maintenance instructions. Any maintenance or service procedure beyond the scope of those provided in this section should be referred to a qualified service center. Sales / Repair Facilities U.S.A.
Bird Series 3170A High-Speed RF Monitoring System Preventive Maintenance Preventive maintenance is limited to cleaning the unit and connectors. WARNING Disconnect this unit from ac power source before any disassembly for cleaning, repair or replacement procedures. The potential for electrical shock exists. Cleaning WARNING When using dry cleaning solvents, provide adequate ventilation and observe normal safety precautions.
- Troubleshooting Table 5-1 contains troubleshooting information for problems which can occur during normal operation. Locate the problem, review the possible cause, and perform the corrective action listed. Only those functions within the scope of normal maintenance are listed. This manual cannot list all malfunctions that may occur, or corrective actions. If a malfunction is not listed or not corrected by the listed corrective actions, notify a qualified service center.
Bird Series 3170A High-Speed RF Monitoring System Disassembly Meter Replacement If the meters should become defective and require replacement, proceed as outlined in the following steps: 1. Remove the housing that covers the back of the meters by unscrewing the four 4-40 oval head screws from the front panel. These screws are located above and below the meter faces. The cover will come right off. 2. Observe the connections of the meter leads, to maintain the correct polarity in reassembly.
- Replacement Parts List QTY.
Bird Series 3170A High-Speed RF Monitoring System 7 " Line Section 8 The following tables are used to select elements for 7 8 " line sections.
- Table 5-5 High Frequency Milliwatt Elements Entire Table 8% FS Power Range Frequency Band (Watts) .45 to 2.
Bird Series 3170A High-Speed RF Monitoring System Table 5-8 5-8 100 mW Frequency Band (MHz) 45-50 50-60 60-66 66-72 72-76 76-82 82-88 88-97 97-108 108-136 135-175 170-190 190-210 210-216 216-230 230-240 240-250 250-260 260-270 270-280 280-290 290-300 300-320 320-340 340-360 360-380 380-400 400-420 420-450 450-470 470-500 500-600 600-800 800-1000 Cat.
- 1 5 8" Line Section The following tables are used to select elements for 1 5 8" line sections. Table 5-9 Low Frequency Elements Power Frequency (MHz) Range 950-12 1100-1 1700-2 2200-2 2300-24 2400-25 2500-26 2600-27 (Watts) 60 800 200 300 00 00 00 00 1 1 J 1 K 1 L 1 M 431-17 431-20 431-23 431-12 0 2.5 2.5 J 2.5 K 2.5 L 2.
Bird Series 3170A High-Speed RF Monitoring System Table 5-12 1-5 8BB Standard Elements 30µA Power Range 2-30 100 W — Frequency Bands (MHz) 25-60 50-125 100-250 200-500 400-1000 100A32 100B32 100C32 100D32 100E32 Table 5-13 3 18AA Standard Elements 30µA Power Range 50kW 30µA Frequency bands (MHz) 25-60 50-125 50KA42 50KB42 100-250 50KC42 3 18AAA 6 18" Line Section The following tables are used to select elements for 6 18" line sections.
Difference Data Sheet Table A-1 is used to outline the differences between various models. Table A-1 Differences Between Models Model Line Section Mount Front Panel External Meter Scale Watts 25/50/1 00 AFM Delay Adjustment Range kiloWatts 70ms to 7.1ms to 5s 5/10/2 15/30/6 50ms 5 0 3170A 4 4 4 3170A200 4 4 4 3170A300 4 4 4 3171A020 4 3172A 4 4 4 3173A 4 4 4 4 4 Hold to +5V Internally +2.
Bird Series 3170A High-Speed Wattcher RF Monitoring System A-2
Appendix B User Applications and Wiring This section is a collection of user specific applications and the wiring information required to activate them. Connector Assignment Connection BNC Jacks J1 & J2 J3 J4 TB1,2 TB3,4 TB5 TB6 TB7 TB8 TB9 Description DC Input Forward & Reflected Function Detected RF signals from sensors Levels 30µA full scale into 1400Ω (42mV).
Bird Series 3170A High-Speed Wattcher RF Monitoring System Active Forward Monitor (AFM) Input Wiring concept examples for activating the AFM circuit are shown below. These can be used for remote on site or off site manual or automatic activation. Dry Contact Closure Closure will be from terminal 10 to case ground, terminal 7, in any convenient form, e.g. by an extra set of manual contacts on the transmitter keying relay or a separate remote switch.
- Confirm Output For visual confirmation of transmitter “ON” see circuit below. Relay Control Relay control for greater current requirements. Figure B-3 Confirm Output Relay Control LED Indicator Simple local or remote light emitting diode indicator, that requires no more than 180mA.
Bird Series 3170A High-Speed Wattcher RF Monitoring System Reset Input A remote reset could be used in case of false alarm or a brief disturbance has tripped the Wattcher Monitor but left the transmission intact. Remote Contact Reset This option allows reset on site, but remote from the Wattcher unit. Terminal 8, Reset, is active low and will cause a reset when the switch is closed, making a connection to terminal 7, ground.
- Remote monitoring is accomplished by connecting a recorder to the remote meter jack, J4. An X-Y recorder can be used for time logging of forward and reflected power per FCC requirements for remote sites. Any number of meter pairs can be driven by the meter amplifiers up to 1mA into a total load of 470 to 1400 ohms, without effecting scale shape. Long line losses are compensated by adjusting amplifier gain and full scale meter current after network is balanced and amplifier zero setting.
Bird Series 3170A High-Speed Wattcher RF Monitoring System B-6
