QRP Club

QRP Station => Antennas => Topic started by: sm5mek on April 30, 2014, 08:37:22 UTC

Title: End feed windom
Post by: sm5mek on April 30, 2014, 08:37:22 UTC

Was looking at a end feed windom in our national paper QTC, anyone here tested any end feed windom? Looks simple and cheap to build. Already ordered the toroids, having wire from old military telephone cable and using RG58 with BNC connector.  :)


Drawing and text here (http://radio.thulesius.se/QRP_QTC/Egenbygge_03_2013.pdf), text in Swedish but drawing in English.

Title: Re: End feed windom
Post by: KO7I on July 21, 2014, 01:01:39 UTC

I was unable to read the text of the article, but looking at the design drawings the first thing that comes to mind is re-radiation off the transmission line. but it appears there might be a single radial that is present to deal with the RF. Otherwise it looks like a very well built antenna.

Vy 73,
 

Title: Re: End feed windom
Post by: sm5mek on July 21, 2014, 06:50:10 UTC

Quote from: KO7I on July 21, 2014, 01:01:39 UTC

I was unable to read the text of the article, but looking at the design drawings the first thing that comes to mind is re-radiation off the transmission line. but it appears there might be a single radial that is present to deal with the RF. Otherwise it looks like a very well built antenna.

Vy 73,

The first balune is an 1:1 for taking care of return signals and the second one on the end of coax is an transformer to split the feeding so it acts like an normal windom. This is the feedpoint. Lets see if i can find some translation of the text, maybee with help of google translate.

Title: Re: End feed windom
Post by: sm5mek on July 21, 2014, 10:37:40 UTC

Now i have done a breaf translation of the tecnikal part of the end feed windom antenna.  Se pics in the original  and the English text here. (http://sm5mek.eu/home/antenner/tradantenner/23-aendmatad-windom)