Hello Howard,
>From the cable length that you measure it looks like 3/4 Lambda instead of 1/4
>Lambda which is too short for convenience working. From the electrical point
>of view it is the same, assuming low loss coax.
David 4X1DG
- Original Message -
From: Howard Kowall
To: AMSAT BB
Sent: Wednesday, March 23, 2011 3:28 PM
Subject: [amsat-bb] Cushcraft 416-TB
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
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