My Fair-Rite's arrived today. I really wanted to try out the 49:1 following your instructions. I always used the FT240-43 with “standard winding”. I'm excited. Thanks for your tips. Best regards and '73, Udo
Thanks! I wish it was my idea but it wasn't, but I try to gather ideas from everyone and put them to use! Thanks for watching! If you haven't already, subscribe and turn on notifications!
@@BudgetHamRadio Yea, it's nothing new, but for some reason, most YTers like to twist those wires. I guess it's because they saw someone do it that way. LOL
Thanks for your detailed work on this autotransformer unun. I like your method of construction and that your results concur with others who have experimented with this method of winding. Enough people are having good results to prove this method is worthwhile.
Great video. Built one of these for 10-40 about 6 months ago. About 64 ft. Very pleased with the performance. Its now my primary. Consistently outperforms the old commercial MYANT EFHW I used to use. Next build is a 56:1 when it warms up outside. BTW, be sure to wear eye protection. Those wire ends are sharp and can get a little gangly while winding.
It took a while to get all of the materials and the mag wire was only 18g ugh, but I built it and I'm pretty pleased. The 10m band 8s a bit higher on swr then I had hoped, but my testing was hasty so I haven't played around with hight or wire length. Question for you... is the 18g mag wire sufficient for up to 100 watts? I never go higher than 25 watts digital so not concerned there. I do havev16g coming and bought extra parts :) Thanks for a great tutorial. Love playing with antennas!
I am considering doing more testing with different capacitor values. If I decide to do that testing it would be easy to include a test without capacitors. Be sure to subscribe if you haven’t already.
The CMC was on about a 2m coax it was just wrapped around the post. Do you have any experience or suggestions on the cap values? Thanks for watching and be sure to subscribe.
I haven’t tested on 160 so I couldn’t say for sure. I think the core would probably work but of course you would need a much longer EFHW element. You woukd need to test and tune the antenna length to get your SWR adjusted. Sorry I don’t have a more definitive answer for you. Thanks for watching, if you haven’t already, please subscribe..
@@Aimsport-video A recommended cap for 100 watt rigs: Kemet C330C101JHG5TA 100pF C0G/NPO 5% 3KV $2.41 at Digikey, $2.12 at Mouser. Low ESR rated. I copied this From k1rf instructions build for efhw
Also, what wire length you exactly used? will be nice if you play around with laying down the counterpoise, no counterpoise, coil compensator and play with length of the wire. Will be a whole new video. Thanks for your videos.
Yeah, I forgot to put the length in the description. I had it written down and just overlooked it. It is there now. I did adjust the length a little to try to balance the SWR between 20 and 15 meters. I ended up with 64 feet of the 22 awg silicone wire like what is in my links in the description. Thanks for watching.
Knew you would get to those cores. Might need a little tuning on the antenna length and resonating coil. I redid my cores to a 56:1 unun and get an easier match on 80 to 10m. It antennas quite well
Hello Budget Ham Radio you could try reading this article on end fed with a 36:1 transformer end experiment "A Deep Dive into End-Fed Half-Wave Antennas (Original)" enjoy.
Thanks for the info. I will try to look that up. Thanks for watching. If you haven't already please like, subscribe and turn on notifications to help out the channel!
What specifically are you looking for that this unun does not do? It should work very well at QRP power levels. Subscribe to be notified when new videos are posted about one per week. Thanks for watching.
@@BudgetHamRadio thank you i want to wind a torid 20watt max a ft140-43 core with 22mag wire cause thats what i have if possable i think i can handle it thank you
Should work great on SSB at 200w. I don’t believe it could handle digital at that power. Good luck and have fun. Thanks for watching and remember to subscribe!
I agree they were a little long while testing but needed either them or test leads in order to connect everything. They were shortened when it was mounted in the enclosure and tested in the field. Thanks for watching. Be sure to subscribe!
The things I saw with this torroid was 40 meters was not very good. SWR 1.5-1.8, and 10 meters was resonant way higher in the 10 meter band. The 10 meter issue can be compensated with a coil in the wire. It definitely has the best efficiency by far. But efficiency doesn't always mean better when you put the wire on it.
I wouldn't bother with the 1.5-1.8 SWR on 40 meters, cause most Rigs' built-in ATU can handle it. But I wonder if a 40-meter-long wire makes any difference.
@edwardpacman7082 Yes, but that's a best case scenario. Also, whether you have a tuner or not, you still have a 2-3 SWR on the matching transformer, which will cause heat and negate the efficiency gains. The 140-43 has a great multi band spread with good SWR on all bands. Yes, it's not as efficient, and it can't handle as much power, but these are the trade-offs. I have done extensive testing with this toroid, and I really don't like it.
I agree that every antenna has it's trade offs and pros and cons. It really depends on what bands you intend to use most often and how you plan to use the antenna. Every antenna is a compromise. Thanks for watching and remember to subscribe if you haven't already.
while that may be the case you are trading antenna gain for a marginally lower SWR. The link to KJ6ER pdf from the first POTA PERformer video of mine goes over that in more detail. 73, Jerry
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My Fair-Rite's arrived today. I really wanted to try out the 49:1 following your instructions. I always used the FT240-43 with “standard winding”. I'm excited.
Thanks for your tips. Best regards and '73, Udo
Hope you enjoy it! Thanks for watching.
It's so refreshing to see someone doing their tap like this, instead of twisting __ inches of wire for the tap.
Thanks! I wish it was my idea but it wasn't, but I try to gather ideas from everyone and put them to use! Thanks for watching! If you haven't already, subscribe and turn on notifications!
@@BudgetHamRadio Yea, it's nothing new, but for some reason, most YTers like to twist those wires. I guess it's because they saw someone do it that way. LOL
Thank you for the master class in antenna theory. 😀🥳
You are very welcome. Thanks for watching. Be sure to subscribe and turn on notifications so you don’t miss new videos.
Love that truck! Learned a ton on this video. Thank you.
Glad you liked it! Thanks for watching. Remember to subscribe to help out the channel!
@@BudgetHamRadio 100% sub'ed
Thanks for your detailed work on this autotransformer unun. I like your method of construction and that your results concur with others who have experimented with this method of winding. Enough people are having good results to prove this method is worthwhile.
Thank you very much for watching and your comments. Be sure to subscribe if you haven’t already.
@@BudgetHamRadio I subscribed a while back and am glad I did. 😃
Very good presentation on this 49:1 . From start to finish you have covered all the bases. Thank You
You are welcome! Subscribe, more videos are planned, about one per week or so. Thanks for watching.
Great video. Built one of these for 10-40 about 6 months ago. About 64 ft. Very pleased with the performance. Its now my primary. Consistently outperforms the old commercial MYANT EFHW I used to use. Next build is a 56:1 when it warms up outside. BTW, be sure to wear eye protection. Those wire ends are sharp and can get a little gangly while winding.
Thanks for the warning and thanks for watching. If you haven’t already, please subscribe.
Nice build, thx 👍
Glad you like it. Hope you have subscribed and turned on notifications.
Great video. Much thanks.
Glad you liked it! Be sure to subscribe and turn on notifications so you won’t miss any new videos.
Great video Ty
I was told if you stack them you would not have great results , I have not tried it yet. Thanks for your time 73s
Thanks for watching. I know Collin MM0OPX has stacked 2 with good results. Be sure to subscribe and turn on notifications.
@ I have already
It took a while to get all of the materials and the mag wire was only 18g ugh, but I built it and I'm pretty pleased. The 10m band 8s a bit higher on swr then I had hoped, but my testing was hasty so I haven't played around with hight or wire length.
Question for you... is the 18g mag wire sufficient for up to 100 watts? I never go higher than 25 watts digital so not concerned there. I do havev16g coming and bought extra parts :)
Thanks for a great tutorial. Love playing with antennas!
18ga should be fine for your application. Thanks for watching.
Marvelous! Makes one wonder what a little more capacitance would do.
Yeah it’s a deep rabbit hole. I may try other caps as money and time allows. Subscribe and turn on notifications so you won’t miss any new videos.
I don't think I've ever seen anyone do testing with and without the cap to show what it does do.
I am considering doing more testing with different capacitor values. If I decide to do that testing it would be easy to include a test without capacitors. Be sure to subscribe if you haven’t already.
May want to try that coil at about 2m from the UNUN on the antenna. Might help. Different cap values may be called for too. Good Work!
The CMC was on about a 2m coax it was just wrapped around the post. Do you have any experience or suggestions on the cap values? Thanks for watching and be sure to subscribe.
Excellent tutorial. Your solution with the tap is fantastic. 🙂 Do you think this core will work with 160m?
I haven’t tested on 160 so I couldn’t say for sure. I think the core would probably work but of course you would need a much longer EFHW element. You woukd need to test and tune the antenna length to get your SWR adjusted. Sorry I don’t have a more definitive answer for you. Thanks for watching, if you haven’t already, please subscribe..
I ordered the Remington 14ga and kemet 100pf low esr capacitor to do that build this week. Gonna have a hell of a time wrapping the 14ga😂
It will definitely be a little harder. Good luck with your build.
Which specific Kemet, voltage?
@@Aimsport-video A recommended cap for 100 watt rigs:
Kemet C330C101JHG5TA 100pF C0G/NPO 5% 3KV $2.41 at Digikey, $2.12 at Mouser.
Low ESR rated. I copied this From k1rf instructions build for efhw
Also, what wire length you exactly used? will be nice if you play around with laying down the counterpoise, no counterpoise, coil compensator and play with length of the wire. Will be a whole new video. Thanks for your videos.
Yeah, I forgot to put the length in the description. I had it written down and just overlooked it. It is there now. I did adjust the length a little to try to balance the SWR between 20 and 15 meters. I ended up with 64 feet of the 22 awg silicone wire like what is in my links in the description. Thanks for watching.
Knew you would get to those cores. Might need a little tuning on the antenna length and resonating coil. I redid my cores to a 56:1 unun and get an easier match on 80 to 10m. It antennas quite well
Thanks for the suggestion. I’m sure I will experiment more at some time. Please subscribe if you haven’t already.
Hello Budget Ham Radio you could try reading this article on end fed with a 36:1 transformer end experiment "A Deep Dive into End-Fed Half-Wave Antennas (Original)" enjoy.
Thanks for the info. I will try to look that up. Thanks for watching. If you haven't already please like, subscribe and turn on notifications to help out the channel!
thank you what about qrp ppl?
What specifically are you looking for that this unun does not do? It should work very well at QRP power levels. Subscribe to be notified when new videos are posted about one per week. Thanks for watching.
@@BudgetHamRadio thank you i want to wind a torid 20watt max a ft140-43 core with 22mag wire cause thats what i have if possable i think i can handle it thank you
@@craigpalmer9196just duplicate what I did with this toroid on your toroid with the 22 awg and you should be golden.
Is this ok for 200w radio too?
Should work great on SSB at 200w. I don’t believe it could handle digital at that power. Good luck and have fun. Thanks for watching and remember to subscribe!
Change the cap to 150 pf.
Good things may happen on the wire length you have.
What should changing the cap do for it?
Jerrym your primary wires are still much too long (about 2"), if you shorten them to 1/2" efficiency will increase
I agree they were a little long while testing but needed either them or test leads in order to connect everything. They were shortened when it was mounted in the enclosure and tested in the field. Thanks for watching. Be sure to subscribe!
The things I saw with this torroid was 40 meters was not very good. SWR 1.5-1.8, and 10 meters was resonant way higher in the 10 meter band. The 10 meter issue can be compensated with a coil in the wire. It definitely has the best efficiency by far. But efficiency doesn't always mean better when you put the wire on it.
I wouldn't bother with the 1.5-1.8 SWR on 40 meters, cause most Rigs' built-in ATU can handle it. But I wonder if a 40-meter-long wire makes any difference.
@edwardpacman7082 Yes, but that's a best case scenario. Also, whether you have a tuner or not, you still have a 2-3 SWR on the matching transformer, which will cause heat and negate the efficiency gains. The 140-43 has a great multi band spread with good SWR on all bands. Yes, it's not as efficient, and it can't handle as much power, but these are the trade-offs. I have done extensive testing with this toroid, and I really don't like it.
I agree that every antenna has it's trade offs and pros and cons. It really depends on what bands you intend to use most often and how you plan to use the antenna. Every antenna is a compromise. Thanks for watching and remember to subscribe if you haven't already.
I've always experimented with different lengths of counterpoise to lower swr and height of transformer from ground, the closer to ground the lower swr
while that may be the case you are trading antenna gain for a marginally lower SWR. The link to KJ6ER pdf from the first POTA PERformer video of mine goes over that in more detail. 73, Jerry