Bird Technologies - The Legend Lives On
Our thanks to Bird Technologies for allowing us to reprint the following article.
By Lynn Strube, Bird Technologies Group Applications Engineer


Introduction


The evolution in public, military and emergency communication is growing at an explosive rate. This reality necessitates the essential need for transmitting equipment to function at its full potential. Confidence in the equipment means knowing that on the operating frequency, the power specified by the transmitter manufacturer, is being achieved, delivered to the antenna and being broadcasted. A Bird THRULINE® Wattmeter was the best selection in the past for measuring RF power and is still a trusted selection today.


The Bird THRULINE® Wattmeter model 43 was created, and first produced, in the 50's. The self-contained instrument used microwatts of energy from the transmission it measured. Its precision reference line section made it economical and provided build-in reference accuracy that remained consistent with age.


In the 1960's the mobile radio had the majority of its components stored in the trunk of a car and was comparable in size to a microwave oven. A Bird 43 THRULINE® Wattmeter was used to test the power output of the two-way mobile radio transmitter and to match it to the antenna most commonly mounted on the trunk. The transmission line to the antenna was very short. This provided easy access to the equipment which in turn made measuring the equipment convenient. Additionally, the same wattmeter was used to measure the RF power in the operational base station...


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