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Preview: Comments on: Random wire antenna for shortwave listening

Comments on: Random wire antenna for shortwave listening

The station, equipment and contacts of amateur radio station VA3STL

Last Build Date: Thu, 01 Aug 2013 23:18:40 +0000


By: Joe

Sat, 20 Jul 2013 20:28:52 +0000

Hi, I built a 9:1 unun for my random length wire SWL antenna by winding 31 turns of 20 magnet wire and then 10 turns of the same wire. One end of the 31 turns went to the wire (approx. 60 feet), one end of the ten turns went to the center of the SO-239. The remaining end of each winding were tied together and went to the common ground. Believe it or not, the thing works! I used 31 turns on the primary because I felt that would give just a tad better match. Anyway, it eliminated all of the electrical noise from the house. Neat project to include the grandkids on, one in which they can actually see the before and after difference. 73 Joe KB0TXC

By: va3stl

Tue, 03 Feb 2009 03:00:33 +0000

Sudipta, That is a very nice offer, thank you very much. I am sure any interested readers will contact you and at least pay for shipping. 73 and very best DX Alan VA3STL

By: Sudipta Ghose

Tue, 03 Feb 2009 00:38:16 +0000

I have a very good stock of binocular cores that were used in the B/W TVs. With demise of B/W TV nobody looks for them. In case you want to experiment I can send you a supply free. I live in India and SWLing since 60s. Regards, Sudipta Ghose oneghose at gmaildotcom

By: va3stl

Sun, 27 Jul 2008 19:28:46 +0000

Terry, Thanks for the update and great news to here the transformer and antenna work so well for you. It is always satisfying to build something yourself and to find it performs as well as you hoped, or better. Enjoy the SWLing with your new antenna. Best regards Alan, VA3STL

By: terry lynch

Sun, 27 Jul 2008 13:11:06 +0000

Alan, I got some fb-77-6301 beads from Amidon and wound 2 windings 3 turns and 9 turns, the 9 turns goes to 15 meters of wire plus earth and the 3 turns goes to the receiver.It works perfectly from 198khz to 30mhz.I am very pleased!. Best wishes, Terry lynch.

By: terry lynch

Wed, 25 Jun 2008 12:20:07 +0000

Thanks, Alan for your reply!. I will try a few ferrite cores and let you know how things work out.Best wishes, Terry.