Tech Articles

All About the 1:1 Current/Choke Balun

Posted by Jerry Sodus, KM3K on 18th Oct 2018

How a 1:1 Guanella-Balun (Current-Balun) Operates By Jerry Sodus, KM3K In the spirit of the hobby, I pass along what I have learned and don’t profess to know all the answers. 1. The primary reason … read more

Noise Sources, RFI and their Suppression

Posted by Bob, KZ5R on 20th Mar 2017

With the advent of new technology in TV's, power supplies/chargers, new lighting products and other modern devices, there is an unfortunate downside from the electronic noise many of these items gen … read more

Balun and Unun Core Material Selection

Posted by Various on 7th Nov 2016

This is why use of a mix 43 for HF applications is almost always a mistake.Balun and Unun Core SelectionTransmitting balunsOccasionally errors are made regarding core selection and this especiall … read more

But I Only Run 100 Watts!

Posted by Bob, KZ5R on 18th Oct 2015

As with most equipment, we have become accustomed to determining our needs relative to power handling capability and the output power being used. However, when it comes to baluns and ununs, this rat … read more

Baluns for Multiband Antennas fed with Open Wire or Ladder line

Posted by Bob, KZ5R on 20th Nov 2014

At least once a week we receive a request a for high ratio balun (6:1, 9:1, 12:1) to manage the transition from high impedance ladder line / open wire feedline to coax.  This is a common mis … read more