[amsat-bb] Cushcraft 416-TB

Howard Kowall hkowall at shaw.ca
Wed Mar 23 06:28:07 PDT 2011

Hello All
I acquired a Cushcraft 416-Tb antenna,the so called phasing harness was in bad shape,so I am going to make a new one for it.
I could copy the original one,but yes I am making it hard on myself and decide to calculate the proper cable type and length,and to do that I need to know how the antenna actually works.Here is my problem ,the 2 driven elements have a balun to each of the Tmatchs to make the impedance 50 ohms on each driven element.The original phasing harness is 2 piece of 75 ohm aprox 13" that goes to each driven element and the a so239 connector on the other end of the harness is the 50 ohm feedline.I originally thought this was a matching stub,but when I do the calculation for the matching stub,should only be aprox 4" to each driven element.Am I missing something here,how are they able to do this,does anyone know this antenna and how it works.
Thanks to all who read and respond in advance
Howard VE4ISP

More information about the AMSAT-BB mailing list