L = 234/1090 Mhz = .2146 feet = 0.2146 x 12 inches = 0.2146 x 12 x 25.4 mm = 65.4 mmAgain I refer to this diagram. Can someone help me understand what length L refers to? As in, L = 234/1090 Mhz = .2146 (presumably meters, or 214.6 mm). On one side of the diagram they show λ/4. On the opposite side L=234/f(MHz). I could take that to mean that L = λ/4, but that makes no sense when we know that λ/4 of 1090 Mhz is 69 mm. Without L=234/f(MHz) the diagram makes sense to me.
View attachment 1292
Confusion caused by ARRL diagram not mentioning units. They take for granted that every one in the world uses FPS (foot, pound, seconds) system.