Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Wed, 1 Jun 2016 16:20:46 -0400
When you want to measure the "real impedance" at the antenna, isn't it important that you have a feeder (coax) that has the correct Zo=50 ohms all the way? I guess that the bridge will not read a cor
I guess that the bridge will not read a correct antenna Z if the coax is not perfect. actually, what you need is a feedline that has a *known* Z and length. __________________________________________
Hi All, Yes to coax not being perfect. And it has problems too. And it's not a stupid question. The variable no one has ever brought up is "coaxial cable structural return loss" eg: How well can a ma
Real coax is seldom exactly 50 Ohms Real coax has a small amount of reactance Real coax has loss If you don't do a SOL calibration at the antenna end you're just guessing! 73, Roger On 6/1/16 1:20 PM
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Wed, 1 Jun 2016 20:22:15 -0400
An AIM in the shack can do all that for you without ever leaving the rig and it will do it to two or three decimal places. An accuracy that is way beyond being useful. . The difference between 50 ohm