BIRD THRULINE 43 Series User Manual

BIRD THRULINE 43 Series

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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

Table of Contents

Questions and Answers:

W
William KellyAug 11, 2025
Why does my BIRD Measuring Instrument show high VSWR or reflected power?
- D
  Derek YorkAug 11, 2025
  High VSWR or reflected power readings on your BIRD Measuring Instrument can stem from several issues: * A faulty load or poor connectors. You may need to replace the load, antenna, or connectors. * A shorted or open transmission line. In this case, service or replace the line. * Foreign material present in the line section or within the RF connector bodies. Refer to the Cleaning paragraph for guidance on cleaning.
W
walkerrobertAug 20, 2025
What to do if BIRD Measuring Instruments shows intermittent meter readings?
- L
  Lisa HughesAug 20, 2025
  If your BIRD Measuring Instrument displays intermittent or inconsistent meter readings, consider these potential causes: * A sticky or defective meter may be the culprit. Consider replacing the meter or returning the wattmeter to the factory for meter replacement and recalibration. * Dirty DC contact on the elements. Clean the contacts following the cleaning paragraph instructions. * A faulty transmission line or antenna. Inspect the line for any issues.
A
Allison BakerAug 30, 2025
How to fix no meter indication on BIRD Measuring Instruments?
- C
  christina60Aug 30, 2025
  If your BIRD Measuring Instrument shows no meter indication, it could be due to several reasons: * Lack of RF power. Check the RF source. * The “Arrow” on the Plug-in element is pointing in the wrong direction. Reposition the element correctly. * No pick-up from the DC contact finger. Adjust it according to the Contact Adjustment paragraph. * An open or short circuit in the DC meter. Replace the defective cable (RG-58/U). * A burned-out or damaged meter. Replace the meter or return the wattmeter to the factory for meter replacement and recalibration.

BIRD THRULINE 43 Series Specifications

General

Impedance	50 ohms
Accuracy	±5% of full scale
Humidity	Up to 95% non-condensing
Power Range	100 mW to 10 kW
Operating Temperature	-10°C to +50°C

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