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INSTRUCTION BOOK FOR
RF DIRECTIONAL
THRULINE
®
WATTMETER
MODEL 43
Also Covers Models
4305, 4330, 4431, 4521-27, and 43P
© Copyright 1998 by Bird Electronic Corporation
Instruction Book Part Number 920-43 Revision. C
Thruline® and Termaline® are registered trademarks of
Bird Electronic Corporation
Electronic Corporation
Cleveland (Solon) Ohio USA
Safety Precautions
Keep Away From Live Circuits
Do Not Service Or Adjust Alone
Safety Earth Ground
Shock Hazard
Resuscitation
Safety Symbols
Warning Statements
Bird Model 43 Wattmeter
Caution Statement
Safety Statements
É
Ú É
Bird Model 43 Wattmeter
Bird Model 43 Wattmeter
About This Manual
Operation
Maintenance
43 43P 4305A 4331
4431 4521 4522 4523
4525 4526 4527
Parts
Changes To The 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.
Bird Model 43 Wattmeter
Table of Contents
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . i
WarningStatements. .....................ii
Caution Statement. . . . . . . . . . . . . . . . . . . . . . iii
Safety Statements. . . . . . . . . . . . . . . . . . . . . . iii
About This Manual. . . . . . . . . . . . . . . . . . . . . . vii
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Purpose and Function. . . . . . . . . . . . . . . . . . . . . 1
Performance Characteristics and Capabilities. . . . . . . . . 1
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . 4
Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . 7
Travelling Wave Viewpoint. . . . . . . . . . . . . . . . . . . 7
Coupling Circuit. . . . . . . . . . . . . . . . . . . . . . . . . 7
Standing Wave Ratio vs Reflected/Forward Power Ratio. . 9
Load Power. . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Measurement And Monitoring of Transmitter Power. . . . 14
Testing of Lines, Connectors, Filters, Etc.. . . . . . . . . . 14
FrequencyResponse.....................16
ImpedanceMismatch.....................17
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Portability. . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Connections. . . . . . . . . . . . . . . . . . . . . . . . . . 19
Remote Installation. . . . . . . . . . . . . . . . . . . . . . 20
Operating Instructions. . . . . . . . . . . . . . . . . . . . 23
Zero Adjust. . . . . . . . . . . . . . . . . . . . . . . . . . 23
General. ...........................24
NormalOperation.......................25
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . 31
Troubleshooting........................31
Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Preventive Maintenance. . . . . . . . . . . . . . . . . . . 33
Line Section Care. . . . . . . . . . . . . . . . . . . . . . . 33
Contact Adjustment. . . . . . . . . . . . . . . . . . . . . . 33
Calibration Checks - Thruline Wattmeter vs
TermalineWattmeters. ...................34
Model 43 Replacement Parts List. . . . . . . . . . . . . . . . . . . 35
Model 4431 Thruline Wattmeter. . . . . . . . . . . . . . . . . . . . 38
Theory of Operation. . . . . . . . . . . . . . . . . . . . . 38
Operation. ..........................40
Maintenance..........................40
Model 4431 Replacement Parts List. . . . . . . . . . . . . 41
Series 4520 Thruline Wattmeters. . . . . . . . . . . . . . . . . . . 42
Installation...........................42
Theory of Operation, Operating Instructions and Mainte-
nance Sections. . . . . . . . . . . . . . . . . . . . . . . . 43
Series 4520 Replacement Parts List. . . . . . . . . . . . 43
Model 4305A Thruline Wattmeter. . . . . . . . . . . . . . . . . . . 44
Bird Model 43 Wattmeter
Model 4305A Replacement Parts List. . . . . . . . . . . . 45
Model 4330 Thruline Wattmeter. . . . . . . . . . . . . . . 45
Model 4330/31 Replacement Parts List. . . . . . . . . . . 46
Model 43P Peak Wattmeter. . . . . . . . . . . . . . . . . . . . . . 46
Model 43P Specifications. . . . . . . . . . . . . . . . . . . 47
Operation. ..........................47
Peak Detector Response. . . . . . . . . . . . . . . . . . . 47
Model 43P Peak Calibration. . . . . . . . . . . . . . . . . 48
Maintenance..........................49
Customer Service. . . . . . . . . . . . . . . . . . . . . . . 50
Bird Model 43 Wattmeter
Chapter 1
Introduction
Purpose and Function
Performance Characteristics and Capabilities
Bird Model 43 Wattmeter
Raised Stop Edge
Stop Pin
Figure 1
Stop Pin
S
top Pin
Co
nt
ac
t
Figure 2
Stop pin and
contact
Introduction
Specifications
Impedance, Nominal (All Models) 50 ohms
Insertion VSWR
All models except 4431
4431
Less than 1.05:1 maximum
1.07 (when coupling is less than
30dB)
Connectors
RF Sampling (if applicable)
Primary Line
Female BNC
Bird “QC” Female N normally supplied
Power and Frequency Range
Models: 43, 43P, 4521/22/23/25/26
Model 4527
Model 4431
Model 4305
Model 4330
100mW-10kW Frequency range from
0.45 to 2700 MHz (depending on
element).
1000W maximum 2-200MHz
500W maximum from 200-512MHz
5000W maximum from 2-30MHz
1000W maximum from 30-1000MHz
(applicable only when coupling is
less than 30dB).
25kW Maximum from 0.45-2.5 MHz,
10kW from 2-30 MHz.
5000 W Maximum from 2-30 MHz.
1000 W Maximum from 30-1000 MHz
(applicable only when coupling is
less than 30 dB).
Bird Model 43 Wattmeter
Accuracy (All Models CW)
(Model 43P, Peak Power)
± 5% of full scale.
± 8% of full scale.
Dimensions, Nominal
Models 43
Model 4431
Model 4305A
Models 4521/22/23/25/26/27
3-5/8"L x 4"W x 6-7/8"H
(92.1 x 101.6 x 174.6 mm)
3-27/32"L x 4"W x 6-7/8"H
(97.6 x 101.6 x 174.6 mm)
4-5/32"L x 3-27/32"W x 6-53/64"H
(105.6 x 98 x 173 mm)
19" W x 5-7/32" H x 1-11/16" D
(483 x 133 x 43mm)
Weight, Nominal
Model 43
Model 43P
Model 4431
Model 4305A
3 lb. (1.36 kg)
4 lb. (1.8 kg)
3-1/2 lb. (1.59 kg)
3-1/4 lb. (1.47 kg)
Operating Position Any
Finish (All Models) Grey Powder Coat
RF Coupling
Model 4527
Model 4431
Approx. -53 dB from 512 MHz down
to 10 MHz decreasing to -70 dB
between 10 and 2 MHz.
Adjustable, 15-70 dB
Insertion Loss (Model 4431)
2-512 MHz.
512-1000 MHz
0.1dB Maximum
0.2dB Maximum*
Introduction
1-5/16"
(33.3mm)
3-3/8"
3-5/8"
(92.1mm)
(85.7mm)
6-7/8"
(174.6mm)
4"
(101.6mm)
1-3/4"
(44.5mm)
Female "N" Q.C.
Connectors (2)
(Normally
Supplied)
Socket for
Extra Element
Model 43 Outline Drawing
Bird Model 43 Wattmeter
/
