J. Raymond Bird, who had founded the company a decade earlier, invented this practical device in 1952, 50 years ago. More than a quarter of a million wattmeters have followed that unit off the ...

If there’s one instrument that hams and other radio enthusiasts covet, it’s the venerable Bird 43 Thruline wattmeter. The useful RF tool has barely changed in the nearly 70 years since it was ...