majoco
Stirrer
Everything I know about impedance matching comes from here....
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ApexRadio RX antenna
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majoco
Stirrer
.....and here's a pic of my unun made from a FT-114-43 ring and a braid-breaker.
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majoco
Stirrer
It works well right up to 20MHz, above that it's pretty quiet but there's not a lot of activity around here. The 11m CB band useage is almost nil and I don't get much on my discone into an Icom R7000 either. I could get an FT-114 -73 ring or -J and make another but it probably would be worth the effort. I notice that the John Bryant text says they only tested up to 7MHz but perhaps that was the limit of their test procedure. However, I found this on the Palomar Engineers website...
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majoco
Stirrer
I also found this very interesting site...
http://www.philipstorr.id.au/radio/technical/Balun and UnUn.pdf
....so I'm going to experiment with a binocular core with a higher mix, say 61 or 73 so that I can reduce the number of turns which is supposed to improve the efficiency.
There's mention in there also of a kitset for an antenna analyser for AU$145 which is pretty cheap.
http://www.philipstorr.id.au/radio/technical/Balun and UnUn.pdf
....so I'm going to experiment with a binocular core with a higher mix, say 61 or 73 so that I can reduce the number of turns which is supposed to improve the efficiency.
There's mention in there also of a kitset for an antenna analyser for AU$145 which is pretty cheap.
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Martin,
Been digesting all this, thanks for posting.
The first article mentions the IRCA (International Radio Club of America) which is primarily a MW DX club. So, my guess is that much of what is presented there is optimized for the AM BCB.
My antennas with 9:1 ununs using 43 material work great on LW and MW but start to go deaf much above 80 meters.
Have not had much luck here with powdered iron material for LW/MW but built an antenna with a unun using T106-2 and it worked well on 40 meters and higher frequencies.
Been digesting all this, thanks for posting.
The first article mentions the IRCA (International Radio Club of America) which is primarily a MW DX club. So, my guess is that much of what is presented there is optimized for the AM BCB.
My antennas with 9:1 ununs using 43 material work great on LW and MW but start to go deaf much above 80 meters.
Have not had much luck here with powdered iron material for LW/MW but built an antenna with a unun using T106-2 and it worked well on 40 meters and higher frequencies.
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