wattmeter called diamond

Auto Couplers - Article by K0BG on automatic antenna couplers, erroneously called antenna tuners with reviews of popular tuners and basic concepts.

ChuckMartin - RF Supply - RF Wattmeters - RF Power Measurement - Bird Wattmeters Telewave - Coaxial Dynamics Wattmeters - Daiwa Wattmeters

Build a simple RF sampler - Homemade simple RF sampler for the Bird Model 43 Thruline Wattmeter By W3KKC

Inside Those Bird Slugs - Notes on Birds wattmeter slugs

Elecraft W2 Watt Meter Build - N1IC - Elecraft W2 Wattmeter Build (part of Elecraft K3 Build)