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Many thanks
15 April 2014 | by to those of you who posted comments, or sent me private e-mails concerning the 9:11 UNUN, and particularly to “Anonymous” who provided the link to: http://www.balundesigns.com/servlet/the-102/QRP-9-cln-1-Unun-1.5/Detail
That was an eye-opener. If the weather isn’t too chilly or damp this weekend, I think I am going to see what happens when I use the 24.5′ and 36′ wires as the radiator. As my friend Bob W3BBO says, this is the fun of playing around with homebrew antennas – playing around until you discover something that works for you. It will help if propagation is decent – it’s never a great day to evaluate an antenna when just about no one is around!
The 24.5′ wire would allow decent SWRs on 40 through 6 Meters (according to the chart, the highest SWR would be on 17 Meters at 2.1:1), while the 36′ wire would allow decent SWRs on 80 through 6 Meters (according to the chart, the highest SWR would be on 20 Meters at 2:1). In either event, this should work better than what I had previously tried, where I was getting a 3:1 SWR or higher on some bands.
I know there’s no “one size fits all’ kind of solution here. If there was, someone would be either very rich, or very famous. My concern is to be able to go to the park, toss one manageable wire into a tree and get as much operating time in as possible. Multi-band doublets might yield better results, but at a cost of increased setup time as well as the need for two supports. Another simultaneous goal is to be able to switch bands as much as possible, without messing around with wires too much after the initial set up.
I know – about as easy as trying to change lead into gold.
I’ll keep you who are like minded posted as to what I discover.
72 de Larry W2LJ
QRP – When you care to send the very least!
3 Responses to “Many thanks”
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Bob at Balun Designs knows how to treat his customers. I am on my 3rd balun from him. Well made. Built to last. Good value.
Too often, I have run into employees & even owners that treat the Ham buyer w/o respect. I don’t think that will ever happen at Balun Design. – 73 Bob
kx3helper.com has a 9:1 unun fed antenna at 31′ long. So it is interesting to see all the “magic” lengths that work.
Do let us know what you find. I just built a 9:1 unun, and am interested in experimenting with it. Waiting on coax.
I built one of these with #10 insulated wire. Needless to say the core quickly became very crowded. I played around with it some but not enough to ‘get it right. This balun is very neat and tidy, nice! The workmanship puts mine to shame. I’ll have to get some magnet wire and teflon tape and re do the core.
Please keep us posted, Larry! This is very interesting antenna.