bird model 43 wattmeter
the bird model 43 thruline directional wattmeter created in 1950s. self-contained instrument used microwatts of energy transmission measured. reference line section made economical , provided built-in reference accuracy remained consistent age. patent granted directional wattmeter in 1958.
in 1960s mobile radio had majority of components stored in trunk of car , comparable in size microwave oven. model 43 wattmeter used test power output of two-way mobile radio transmitter , match antenna commonly mounted on trunk. transmission line antenna short providing easy access equipment in turn made measuring equipment convenient. additionally, same wattmeter used measure rf power in operational base station.
in 1970s, mobile radio had advanced trunk of car car s front interior. model 43 still used in same capacity of testing rf output , matching transmitter antenna. however, new interior position of mobile radio, , existing rear antenna position required longer transition line. still provided easy access test , measure system.
the model 43 used in aviation industry accomplish identical results. measure power transmitter , match antenna system.
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