INSTRUCTION BOOK
A
OPERATING INSTRUCTIONS
SERIES 4201 MULTI-CHANNEL
RF DIRECTIONAL
THRULINE®WATTMETER
Electronic Corporation
Cleveland (Solon) Ohio US
©
Copyright 1997 by Bird Electronic Corporation
Instruction Book Part Number 920-4201S Revision A
Thruline
®
is a Registered Trademark
of Bird Electronic Corporation
Safety Precautions
General 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. Do not replace components inside
equipment with the high voltage supply turned on. To avoid casualties, always remove power.
Shock Hazard
Do not attempt to disconnect an RF transmission line while RF power is present. Radiated RF power is a
potential health hazard.
Resuscitation
Personnel working with or near high voltages should be familiar with modern methods of resuscitation.
Safety Symbols
WARNING
Warning notes call attention to a procedure, which if not performed correctly, could result in personal injury.
CAUTION
Caution notes call attention to a procedure, which if not performed correctly, could result in damage to the equipment.
This symbol appears on the equipment indicating there is important information in
the instruction manual regarding that particular area.
+ Note: Calls attention to supplemental information.
Series 4201 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
Leaking RF energy is a potential health hazard. Never attempt to connect or disconnect equipment from the
transmission line while RF power is being applied. Severe burns, electrical shock, or death can occur.
Series 4201 Caution Statements
The following equipment cautions appear in the text whenever the equipment is in danger of damage and
are repeated here for emphasis.
CAUTION
Do not drop the instrument or Plug-In elements. The meter may be damaged, or the accuracy of the elements could
be affected.
CAUTION
Do not attempt to check the microammeters with an ohmmeter. Damage to the movement or pointer will result.
i
Bird Series 4201 Multi-Channel RF Directional Wattmeter
USAGE
ANY USE OF THIS INSTRUMENT IN A MANNER NOT SPECIFIED BY THE
MANUFACTURER MAY IMPAIR THE INSTRUMENT’S SAFETY PROTECTION.
USO
EL USO DE ESTE INSTRUMENTO DE MANERA NO ESPECIFICADA POR EL
FABRICANTE, PUEDE ANULAR LA PROTECCIÓN DE SEGURIDAD DEL INSTRUMENTO.
BENUTZUNG
WIRD DAS GERÄT AUF ANDERE WEISE VERWENDET ALS VOM HERSTELLER
BESCHRIEBEN, KANN DIE GERÄTESICHERHEIT BEEINTRÄCHTIGT WERDEN.
UTILISATION
TOUTE UTILISATION DE CET INSTRUMENT QUI N’EST PAS EXPLICITEMENT
PRÉVUE PAR LE FABRICANT PEUT ENDOMMAGER LE DISPOSITIF DE
PROTECTION DE L’INSTRUMENT.
IMPIEGO
QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO DIVERSO
DA COME SPECIFICATO DAL PRODUTTORE LA PROZIONE DI SICUREZZA
POTREBBE VENIRNE COMPROMESSA.
SERVICE
SERVICING INSTRUCTIONS ARE FOR USE BY SERVICE -TRAINED PERSONNEL ONLY. TO AVOID DANGEROUS ELECTRIC SHOCK, DO NOT PERFORM
ANY SERVICING UNLESS QUALIFIED TO DO SO.
SERVICIO
LAS INSTRUCCIONES DE SERVICIO SON PARA USO EXCLUSIVO DEL PERSONAL DE SERVICIO CAPACITADO. PARA EVITAR EL PELIGRO DE DESCARGAS ELÈCTRICAS, NO REALICE NINGÙN SERVICIO A MENOS QUE ESTÈ
CAPACITADO PARA HACERIO.
WARTUNG
ANWEISUNGEN FÜR DIE WARTUNG DES GERÄTES GELTEN NUR FÜR
GESCHULTES FACHPERSONAL.
ZUR VERMEIDUNG GEFÄHRLICHE, ELEKTRISCHE SCHOCKS, SIND WARTUNGSARBEITEN AUSSCHLIEßLICH VON QUALIFIZIERTEM SERVICEPERSONAL DURCHZUFÜHREN.
ENTRENTIEN
L’EMPLOI DES INSTRUCTIONS D’ENTRETIEN DOIT ÊTRE RÉSERVÉ AU PERSONNEL FORMÉ AUX OPÉRATIONS D’ENTRETIEN. POUR PRÉVENIR UN
CHOC ÉLECTRIQUE DANGEREUX, NE PAS EFFECTUER D’ENTRETIEN SI
L’ON N’A PAS ÉTÉ QUALIFIÉ POUR CE FAIRE.
ii
ASSISTENZA TECNICA
LE ISTRUZIONI RELATIVE ALL’ASSISTENZA SONO PREVISTE ESCLUSIVAMENTE PER IL PERSONALE OPPORTUNAMENTE ADDESTRATO. PER EVITARE PERICOLOSE SCOSSE ELETTRICHE NON EFFETTUARRE ALCUNA
RIPARAZIONE A MENO CHE QUALIFICATI A FARLA.
RF VOLTAGE MAY BE PRESENT IN RF ELEMENT SOCKET - KEEP ELEMENT
IN SOCKET DURING OPERATION.
DE LA TENSION H.F. PEAT ÊTRE PRÉSENTE DANS LA PRISE DE L’ÉLÉMENT
H.F. - CONSERVER L’ÉLÉMENT DANS LA PRISE LORS DE L’EMPLOI.
HF-SPANNUNG KANN IN DER HF-ELEMENT-BUCHSE ANSTEHEN - ELEMENT WÄHREND DES BETRIEBS EINGESTÖPSELT LASSEN.
PUEDE HABER VOLTAJE RF EN EL ENCHUFE DEL ELEMENTO RF - MANTENGA EL ELEMENTO EN EL ENCHUFE DURANTE LA OPERACION.
IL PORTAELEMENTO RF PUÒ PRESENTARE VOLTAGGIO RF - TENERE L’ELEMENTO NELLA PRESA DURANTE IL FUNZIONAMENTO.
iii
Bird Series 4201 Multi-Channel RF Directional Wattmeter
iv
About This Manual
This instruction book covers the Series 4201 Multi-Channel RF Directional Wattmeters. Specifically, the
Models 4201A501, 4201A502, 4201A503, and 4201A504.
This instruction book is arranged so that essential information on safety appears 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. At the beginning of each chapter, a general
overview describes the contents of that chapter.
Operation
First time users should read Chapter 1 - Introduction, and Chapter 2 - Installation. to get an overview of
equipment capabilities and installation. An experienced operator can refer to Chapter 3 - Operating
Instructions. All instructions necessary to operate the equipment appear in this chapter.
Maintenance
All personnel should be familiar with preventative maintenance found in Chapter 4 - Maintenance. If a
failure should occur, the troubleshooting section will aid in isolating and repairing the failure.
Parts
For location of major assemblies or parts, refer to the parts lists and associated drawings in Chapter 4 Maintenance.
Changes To This Manual
We have made every effort to ensure this manual is accurate. If you should discover any errors or if you
have suggestions for improving this manual, please send your comments to our factory. This manual may
be periodically updated. When inquiring about updates to this manual refer to the part number and revision
level on the title page.
v
Bird Series 4201 Multi-Channel RF Directional Wattmeter
vi
Table Of Contents
Safety Precautions. ...................................i
Warning Statements. ...................................ii
Caution Statements. ................................... iii
About This Manual. .................................. v
Introduction. ...................................... 1
Wattmeter. ........................................ 1
Purpose and Function. ................................ 1
Theory of Operation. ................................. 1
Specifications. ...................................... 2
Models: 4201A501, 4201A502. ........................... 2
Models: 4201A503, 4201A504. ........................... 2
Items Required But Not Supplied. ........................... 2
Models: 4201A501, 4201A502. ........................... 2
Models: 4201A503, 4201A504. ........................... 2
Power Sensors. ..................................... 4
Specifications. .................................... 4
Installation. ....................................... 5
Site and Shelter Requirements. ........................... 5
Unpacking and Inspection. .............................. 5
Tools Required. ................................... 5
Power Sensor or Line Section. ........................... 5
Installation of Meter. ................................. 6
Phono Plugs. ..................................... 6
Operating Instructions. ................................ 9
Description of Controls. ................................. 9
Models 4201A501 and 4201A503. ......................... 9
Models 4201A502 and 4201A504. ......................... 9
Zeroing Meters. .....................................10
Using The Wattmeter. ..................................10
vii
Bird Series 4201 Multi-Channel RF Directional Wattmeter
Models 4201A501 and 4201A502. ......................... 10
Models 4201A503 and 4201A504. ......................... 10
VSWR Conversion Nomograph. .......................... 11
Maintenance. ...................................... 13
General. ....................................... 13
Customer Service. ................................... 13
Sales/Repair Facility. ................................ 13
Sales Facilities. ................................... 13
Troubleshooting. .................................... 14
Replacement Parts. .................................. 14
Cleaning. ........................................ 15
Meter Replacement. .................................. 15
Cable Replacement. .................................. 15
4201A003. ...................................... 15
4201A004. ...................................... 16
viii
Chapter 1
Wattmeter
Introduction
Purpose and
Function
The 4201 Series Multi-Channel RF Directional Wattmeter is used in conjunction
with Bird Power Sensors, or rigid line sections and elements. Together these
components build a RF power measurement system capable of displaying RF power
of up to 24 transmitters, depending on the model used. Dual meters simultaneously
display forward and reflected power in a 50 ohm transmission line.
Theory of Operation The Series 4201 Multi-Channel Wattmeter accepts dc inputs from remotely located
Bird Power Sensors, or rigid line sections with elements. Forward and reflected
signals are applied to a manual switching network which selects one of 12 or 24
channels. The output of the switching network is connected to the meters for direct
readout. The meter scaling is in accordance with input requirements and must be
the same for all inputs to the wattmeter. Refer to figure 1.
Figure 1
Block Diagram
FWD
Power
Sensor
FWD
RFL
Channel
1
RFL
Rigid
Line
Power
Sensor
FWD
RFL
FWD
RFL
Channel
2
Channel
24
FWD
RFL
The Model 4201 wattmeter is a panel mount type. These units are intended for fixed
installation, generally in rack mounts requiring 19 inch panels. A slotted screw is
provided on the lower front face of the meter for zeroing the pointer. The rotary
switch (or switches) on the front of the panel, is for selecting the channel to be
monitored. The Models 4201A501 and 4201A502 have an enable/disable push button
switch. The Models 4201A503 and 4201A504 have an A/B push button switch.
1
Bird Series 4201 Multi-Channel RF Directional Wattmeter
Specifications
Model Channels Meter Scale Each Transmitter Requires
4201A501 24 25/50/100 W Dual Rigid Line Section and Elements
4201A502 12 25/50/100 W Dual Rigid Line Section and Elements
4201A503 24 15/30/60 W Power Sensor
4201A504 12 15/30/60 W Power Sensor
Models: 4201A501,
4201A502
Power Range 10 mW to 10 kW using Bird Plug-In-Elements
Freq. Range 450 kHz to 2.7 GHz (dependent on elements)
Accuracy
± 5% of full scale
Meter Scales FWD and RFL 25/500/100 W
Meter Sensitivity
30 µA/1400 Ω
Front Panel Controls One or two rotary channel selector switches, channel A/B push button on the 24
channel unit, enable/disable push button on the 12 channel unit.
Connectors RCA Phono Jacks
Finish Grey Powder Coat
Nominal Size 19" W x 5-7/32" H x 5" D (483 x 133 x 127 mm)
Nominal Weight
4201A501
4201A502
Models: 4201A503,
4201A504
3 lbs., 11 oz. (1.67 kg)
2 lbs. 14 oz. (1.3 kg)
Power Range Power Sensor Dependent
Freq. Range Power Sensor Dependent
Accuracy
± 5% of full scale
Meter Scales FWD and RFL 15/30/60 W
Meter Sensitivity
30 µA/1400 Ω
Front Panel Controls One or two rotary channel selector switches, channel A/B push button on 24
channel, enable/disable push button on 12 channel.
Connectors RCA Phono Jacks
Finish Grey Powder Coat
Nominal Size 19" W x 5-7/32" H x 5" D (483 x 133 x 127 mm)
Nominal Weight:
4201A503
4201A504
3 lbs. 11 oz. (1.67 kg)
2 lbs. 14 oz. (1.3 kg)
Models: 4201A501,
4201A502
Models: 4201A503,
4201A504
2
Items Required But Not Supplied
Line Section: 4230-053 or 4522-002-5
Elements: Contact bird Electronic Corporation
Cables: 10 ft. — 4201A008-1, 15 ft. — 4201A008-2, 25 ft. — 4201A008-3
Power Sensor: Contact Bird Electronic Corporation
Cables: 10 ft. — 4201A007-1, 15 ft. — 4201A007-2, 25 ft. — 4201A007-3
16
15
4
3
CHANNEL B
17
14
CHANNELA
5
2
19
18
20
21
22
23
13
24
24 CHANNEL RF POWER METER
7
6
8
9
10
11
12
1
Series 4201 Outline Drawing
Models 4201A501 and 4201A503
MODEL 4201
A
B
0
5
10
20
W
ELECTRONIC
BIRD
+ +
10
15
20
20
30
40
60
40
80
50
100
TTA
S
R
THRULINE
CORP.
F.S.= 30UA.PN 2080 -002
0
PN 2080 -002
5
10
20
W
BIRD
10
20
40
T
TA
S
R
THRULINE
ELECTRONIC
60
CORP.
Introduction
15
20
30
40
80
50
100
F.S.= 30UA.
SENSOR INPUTS
6
5
4
3
2
1
FWD
RFL
Models 4201A502 and 4201A504
++
10
5
MODEL 4201
12 CHANNEL RF POWER METER
0
7
8
9
ENABLE
10
11
12
DISABLE
10
20
W
BIRD
20
40
TTA
S
R
THRULINE
ELECTRONIC
60
CORP.
15
20
30
40
80
50
100
F.S.= 30UA.PN 2080 -002
0
PN 2080 -002
5
10
20
W
BIRD
10
20
40
T
TA
S
R
THRULINE
ELECTRONIC
60
CORP.
15
20
30
40
80
50
100
F.S.= 30UA.
FWD
RFL
3
Bird Series 4201 Multi-Channel RF Directional Wattmeter
Power Sensors
Power Sensors, for use with Models 4201A503 and 4201A504 Series Wattmeters,
currently available are listed below.
Specifications
Model FWD Max. Power RFL Max. Power Frequency Range
4152-220 150 W 15 W 30-88 MHz
4163-240 150 W 15 W 118-250 MHz
4164-240 150 W 15 W 420-512 MHz
4169-300 60 W 6 W 805-960 MHz
Insertion VSWR 1.1 max.
Insertion Loss 0.2 dB
Directivity 25 dB min.
Accuracy ± 5% of full scale
Connectors:
RF Input
RF Output
DC Outputs
Finish Grey Powder Coat
Nominal Size
(Including connector)
Nominal Weight 4.5 oz. (128 grams)
Female N
Female N
Solder Lugs
4-1/2" W x 1-1/4" H x 1" D
(114 mm x 32 mm x 25 mm)
4
Chapter 2
k
Installation
This chapter provides information for on site requirements, unpacking, inspection,
and preparing the equipment for use.
The 4201 Series Multi-Channel RF Wattmeter is designed to be used with either
rigid line sections and elements, or power sensors. Throughout this section, refer to
the instructions that apply to your system.
Site and Shelter
Requirements
Unpacking and
Inspection
Tools Required s Screwdriver
The 4201 Series Wattmeter should not be used outdoors or in areas of condensing
humidity.
Follow the steps below when unpacking the equipment.
s Soldering Iron - For connecting meter to power sensor.
Leaking RF energy is a potential health hazard. Never attempt to connect or disconnect
equipment from the transmission line while RF power is being applied. Severe burns,
1. Inspect the shipping container for signs of damage. If damage is noticed, do not unpack the equipment. Immediately
notify the shipping carrier and Bird Electronic Corporation
of the damage.
2. If the shipping container is not damaged, unpack the unit.
Save all shipping materials for repackaging.
3. Inspect all components for visual signs of damage. Immediately notify the shipping carrier and Bird Electronic Corporation of equipment damage or missing parts.
WARNING
electrical shock, or death can occur.
Power Sensor or
Line Section
Figure 2
Line
Section
and Cable.
Phono Jack
1. If you are using a line section, screw the dc connector of
each cable onto the line section. Repeat for each transmitter.
Refer to figure 2.
FWD
DC Connector
RFL
DC Connector
Phono Jac
5
Bird Series 4201 Multi-Channel RF Directional Wattmeter
2. If you are using power sensors, attach the cables to the
power sensors. Attach the forward meter cable to the forward feed-thru on the power sensors, and the reflected meter
cable to the reflected feed-thru. Attach by soldering the cable
to the feed-thru. Repeat for each transmitter. Refer to figure
3.
Figure 3
Power
Sensor and
Cable
Figure 4
Forward and
Reflected
Designations
Feed-Thru
Connectors
Phono Connector
MOD.
RFL
Connectors
Fem-N (2)
POWER SENSOR
4169-300
6.0 W
806-960 MHz
S/N
FWD 60 W
R
3. Install the line sections, or power sensors, into the transmission lines. Refer to figure 4 for the proper direction of
installation.
FWD
Output
MOD.
RFL
POWER SENSOR
4169-300
6.0 W
806-960 MHz
RFL
S/N
FWD 60 W
R
Input
CAUTION
Do not drop the instrument or Plug-In Elements. The meter may be damaged, or the
accuracy of the elements could be affected.
Installation of Meter The wattmeter is for rack mount purposes. Four machine screws fasten the watt-
meter panel in the selected position on a relay rack, using the pattern of tapped
holes regularly provided in standard racks. Follow these instructions for mounting.
1. Choose a location for easy reading and operation of the
wattmeter. Place the wattmeter where the cable lengths will
be short and can be installed without tight bends in the
cables.
2. Using the four screws, install the wattmeter to the rack.
Make sure all connections are secure.
Phono Plugs The phono plugs are color coded for ease of installation. Forward inputs are white,
Reflected inputs are red.
+ Note: Make sure to attach the forward meter to the forward side of the line
section or power sensor. Attach the reflected meter to the reflected side of the
line section or power sensor.
6
Figure 5
Input
Designations
INPUT
MODULE
OUTPUT
CHANNEL A :
CHANNEL B :
FWD SENSORS :
RFL SENSORS :
INPUTS 1 - 12
INPUTS 13 - 24
WHITE INPUTS
RED INPUTS
Installation
!
SENSOR CONNECTIONS
13 15
14
123
4 5
1716
6 8
201918
7
On the top of the module, the sensor connections are labeled. The inputs are on the
rear of the module. Models 4201A502 and 4201A504 have 12 sets of phono jacks,
while the models 4201A501 and 4201A503 have 24 sets. Refer to figure 5. Follow
the instructions below to install the cables
21 22 23
9 10
11 12
24
Top of
Module
13 - 24
Rear of
Module
1-12
1. Push the cable phono plugs into the phono inputs on the
rear of the wattmeter.
2. Make sure there are no sharp bends in the cables.
The line section (if used) must have two elements installed in it. One for the forward
direction and one for the reflected direction. Choose the correct frequency and power
rated elements for your system. Contact Bird Electronic Corporation for more
information.
7
Bird Series 4201 Multi-Channel RF Directional Wattmeter
8
Chapter 3
Operating Instructions
A description of all operator controls and indicators are provided in this chapter.
Read and become familiar with the following instructions before operating the
wattmeter.
Description of Controls
The controls of the wattmeter are on the front of the unit. Refer to the proper section
for your model.
Models 4201A501
and 4201A503
Figure 6
Front Panel of
Model
4201A501
Models 4201A502
and 4201A504
Figure 7
Front Panel of
Model
4201A502
These models have 24 channels for transmitters. They have two rotary channel
selector switches and a channel A/B push button. Refer to figure 6.
CHANNELB
19
18
20
17
16
21
15
22
14
23
13
24
MODEL 4201
24 CHANNEL RF POWER METER
7
8
9
10
11
12
A
B
4
3
CHANNELA
5
2
6
1
10
5
15
20
20
10
30
40
20
60
40
80
50
BIRD
W
THRULINE
ELECTRONIC
100
TTA
S
R
CORP.
F.S.= 30 UA.PN 2080- 002
0
FWD
0
PN 2080- 002
5
BIRD
10
20
W
RFL
10
20
40
T
TA
THRULINE
ELECTRONIC
15
20
30
60
40
80
50
100
S
R
CORP.
F.S.= 30 UA.
These models have 12 channels for transmitters. They have one rotary channel
selector switch and an enable/disable push button. Refer to figure 7.
SENSORINPUTS
6
5
4
3
2
1
7
8
9
10
11
12
MODEL 4201
12 CHANNEL RF POWER METER
ENABLE
DISABLE
10
5
15
20
20
10
30
40
20
60
40
80
50
BIRD
W
THRULINE
ELECTRONIC
100
TTA
S
R
CORP.
F.S.= 30 UA.PN 2080- 002
0
FWD
10
5
15
20
20
10
30
40
20
60
40
80
50
W
BIRD
T
TA
THRULINE
ELECTRONIC
100
S
R
CORP.
F.S.= 30 UA.
0
PN 2080- 002
RFL
All models include two meters for simultaneous display of forward and reflected
power at ± 5% of full scale.
9
Bird Series 4201 Multi-Channel RF Directional Wattmeter
Zeroing Meters
Before any power measurements are made, be sure the pointer rests on the zero
mark. If not, adjust the zero adjustment screw clockwise or counterclockwise until
the pointer rests on the zero mark. The adjusting screw is located at the bottom
center of the meter bezel face. Perform this adjustment, if needed, on both meters.
Refer to figure 8.
Figure 8
Zero
Adjustment
Models 4201A501
and 4201A502
Zero Adjust Screw
Using The Wattmeter
Operation of the Wattmeter using line sections and elements.
1. Make sure the Plug-In-Elements, in the line sections of the
transmission lines, are properly positioned and directed.
2. Turn the switch, or switches, to a channel that is connected
to the transmitter to be monitored. If applicable, press the
push button to enable.
3. Turn on the transmitter.
4. Read the actual power values directly on the meters. The
wattmeters have triple-range scales on both the forward and
reflected powers. The full scale value shown on the element
cap determines the power scale to be read.
Models 4201A503
and 4201A504
Operation of the Wattmeter using Power Sensors.
1. Make sure the power sensors are properly positioned and
directed in the transmission line
2. Turn the switch, or switches, to a channel that is connected
to the transmitter to be monitored. If applicable, press the
push button to enable.
3. Turn on the transmitter.
4. Read the actual power values directly on the meters. The
wattmeters have triple-range scales on both the forward and
reflected powers.
The Multi-Channel Wattmeter provides continuous, uninterrupted observation of the
RF transmission equipment’s performance. The advantage of simultaneous surveillance of the meters is that the indication is always present without having to rotate
the Plug-In-Element to obtain forward or reflected power values. The forward/reverse
RF power ratio is readily calculated from the readings, and the VSWR may be
determined from figures 9 and 10.
10
C
Operating Instructions
VSWR Conversion
Nomograph
Using the VSWR Nomograph, determine the intersection of the forward and reflected
power values. The slanted line passing closest to this point indicates the VSWR.
Figure 9
10
4.0
3.0
2.5
2.0
1.8
1.6
1.5
20
5.0 25
10 15
30 40
FORWARD POWER - WATTS
1.4
1.3
1.25
1.20
1.16
1.14
1.12
1.10
1.09
1.08
1.07
1.06
1.05
50
100 150 200
300 400
500
REFLECTED POWER - WATTS
2.0
1.8
1.6
1.4
1.2
1.0
20
18
16
14
12
10
8
6
4
.8
.6
.4
.2
VSWR=
0.5
Reflected Power
1+
Forward Power
Reflected Power
1
Forward Power
1.0 1.5
VSWR Conversion Nomograph
VSWR
3.0
2.5
2.0
4.0
VSWR Conversion Nomograph
Figure 10
1.0
.9
.8
VSWR
.7
.6
.5
.4
.3
.2
.1
.09
.08
TED POWER - WATTS
.07
.06
.05
REFLE
.04
.03
.02
10
4.0
3.0
2.5
2.0
1.8
1.6
1.5
1.4
1.3
1.25
1.20
1.16
1.14
1.12
1.10
1.09
1.08
1.07
1.06
1.05
1.04
1.03
.01
1.0 1.5
0.5
3.0
2.5
4.0
2.0
5.0 25
10 15
30 40
20
50
100 150 200
300 400 500
FORWARD POWER - WATTS
11
Bird Series 4201 Multi-Channel RF Directional Wattmeter
12
Chapter 4
Maintenance
General This chapter includes cleaning, inspection, troubleshooting, and performance infor-
mation.
The Wattmeter Models 4201A501, 4201A502, 4201A503, and 4201A504 require only
simple, and routine maintenance such as the following:
s Avoid subjecting the wattmeter to rough treatment.
s Wipe off dust and dirt regularly.
s Check connectors for damage.
s Inspect all cables for damage.
Customer Service
Any maintenance or service procedure beyond the scope of those provided in this
section should be referred to a qualified service center.
All instruments returned for service must be shipped prepaid and to the attention
of the Customer Service Group.
Sales/Repair Facility U.S.A. Sales and Manufacturing
Service Group
Bird Electronic Corporation
30303 Aurora Road
Cleveland (Solon), Ohio 44139-2794
Phone: (440) 248-1200
Fax: (440) 248-5426
Sales Facilities For the location of the sales office nearest you, give us a call, or visit our Web site
at:
http://www.bird-electronic.com
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Bird Series 4201 Multi-Channel RF Directional Wattmeter
Troubleshooting
Use the following table to aid in isolating problems, their cause, and possible
corrections.
Problem Possible Cause Correction
Meter does not indicate power
Meter power reading is incorrect.
No transmitted power. Turn on power source.
No connection from signal source to
input channels of wattmeter.
Poor contact between mating connectors. Check and clean all surfaces of mating
Broken or damaged cable connection. Visual inspection of all cables and
Channel selector switch on wrong
channel.
Meter is damaged. Replace the meter.
Meter is not zeroed. Zero the meter.
Output from sensor or element does not
match meter scale.
Table 1
Troubleshooting Table
Connect remote signal source to input
connector on rear of unit.
connector parts.
connections. Repair or replace where
necessary.
Select proper channel.
Change sensor or element to one with
the proper output to match the scale.
Change wattmeter to one with the proper
meter scales.
Table 2
Model 4201A501
Replacement Parts
Table 3
Model 4201A502
Replacement Parts
Table 4
Model 4201A503
Replacement Parts
Table 5
Model 4201A504
Replacement Parts
Replacement Parts
This section provides the user with spare parts lists. Quantities used in the
wattmeter are listed. Refer to the tables below.
Qty. Description Part Number
2 Cable, Interconn. / Assy. 4201A004
2 Cable, Meter / Assy. 4201A003
2 Meter 25/50/100 W 2080-002
Qty. Description Part Number
2 Cable, Meter / Assy. 4201A003
2 Meter 25/50/100 W 2080-002
Qty. Description Part Number
2 Cable, Interconn. / Assy. 4201A004
2 Cable, Meter / Assy. 4201A003
2 Meter 15/30/60 W 2080A069
Qty. Description Part Number
2 Cable, Meter / Assy. 4201A003
2 Meter 15/30/60 W 2080A069
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Maintenance
Cleaning
The outside surface of the unit may be cleaned occasionally with a soft cloth
dampened with a mild detergent solution.
Clean the connectors frequently with alcohol, or an acceptable dry cleaning solvent
that does not leave a residue.
+ Note: Do not wipe the meter glass with a dry cloth, a static charge will develop
and cause an erroneous indication on the meter scale.
Meter Replacement
CAUTION
Do not attempt to check the microammeters with an ohmmeter. Damage to the movement
or pointer will result.
WARNING
Leaking RF energy is a potential health hazard. Never attempt to connect or disconnect
equipment from the transmission line while RF power is being applied. Severe burns,
electrical shock, or death can occur.
The microammeters (meters) are accurate and reliable current measuring instruments which should give long, trouble-free service. The meters are not field repairable, but may be replaced using the following procedure.
1. Use a screwdriver and remove the four screws for rack
mounting.
2. Remove the leads, making note of the wire locations.
3. Remove the three screws holding the meter in place.
4. Remove the defective meter and replace with the new one.
5. Install the three screws previously removed.
6. Install the leads, making sure of correct polarity.
7. Install the panel into the rack.
+ Note: The new meter may need to be zeroed before use. Refer to the zeroing
meters section earlier in this chapter.
Cable Replacement
The cables, used on these models, are replaceable. If clarification of the cable
connections is necessary, refer to figure 1 (Block Diagram).
4201A003 The 4201A003 cable is used from the meter to the phono jacks. Each unit uses two
Figure 11
4201A003 Cable
of these cables, refer to figure 11. To replace the cable or cables, use the following
instructions.
15
Bird Series 4201 Multi-Channel RF Directional Wattmeter
1. Remove the meter from the rack by removing the four screws
holding the panel in place.
2. Remove the leads from the meter, make a note of the
locations.
3. Remove the leads from the phono jacks.
4. Attach the new cable to the meter.
5. Push the cable plug into the phono jack.
6. Repeat if necessary with the second cable.
7. Install the panel in the rack, using the four screws removed
previously.
4201A004 The 4201A004 cables are also replaceable. Two of these cables are used per unit.
The 4201A004 cable is an interconnecting cable used between the Input and the
Output on the module. For identification, refer to figure 12. Replace by following the
instructions below.
1. Remove the defective cable by pulling the plugs out of the
phono jacks.
Figure 12
4201A004
Interconnecting
Cable
2. Label the locations if replacing more than one cable.
3. Install the new cable by pushing the plugs into the same
phono jacks as used by the defective cable.
If the problem is not corrected by any of the remedies in this chapter, contact a
qualified service center.
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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. Seller’s sole obligation under these warranties shall be
to issue credit, repair or replace any item or part thereof which is proved to be other than as warranted;
no allowance shall be made for any labor charges of Buyer for replacement of parts, adjustment or repairs,
or any other work, unless such charges are authorized in advance by Seller.
If Seller’s products are claimed to be defective in material or workmanship or not to conform to specifications,
drawings, blueprints and/or samples, Seller shall, upon prompt notice thereof, either examine the products
where they are located or issue shipping instructions for return to Seller (transportation-charges prepaid
by Buyer). In the event any of our products are proved to be other than as warranted, transportation costs
(cheapest way) to and from Seller’s plant, will be borne by Seller and reimbursement or credit will be made
for amounts so expended by Buyer. Every such claim for breach of these warranties shall be deemed to be
waived by Buyer unless made in writing within ten (10) days from the date of discovery of the defect.
The above warranties shall not extend to any products or parts thereof which have been subjected to any
misuse or neglect, damaged by accident, rendered defective by reason of improper installation or by the
performance of repairs or alterations outside of our plant, and shall not apply to any goods or parts thereof
furnished by Buyer or acquired from others at Buyer’s request and/or to Buyer’s specifications. In addition,
Seller’s warranties do not extend to the failure of tubes, transistors, fuses and batteries, or to other
equipment and parts manufactured by others except to the extent of the original manufacturer’s warranty
to Seller.
The obligations under the foregoing warranties are limited to the precise terms thereof. These warranties
provide exclusive remedies, expressly in lieu of all other remedies including claims for special or consequential damages. SELLER NEITHER MAKES NOR ASSUMES ANY OTHER WARRANTY WHATSOEVER, WHETHER EXPRESS, STATUTORY, OR IMPLIED, INCLUDING WARRANTIES OF
MERCHANTABILITY AND FITNESS, AND NO PERSON IS AUTHORIZED TO ASSUME FOR SELLER
ANY OBLIGATION OR LIABILITY NOT STRICTLY IN ACCORDANCE WITH THE FOREGOING.
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