Hi, I like your coupling setup. Have you tried using different coupling loops diameter? Different coupling loop diameters on different bands improve efficiency and your mounting system would make this easy. Great setup. Thanks for sharing.
I saw this video some time ago and remember what a good idea that was. I’ve always used T240-43 toroids as a n turn : 1 turn impedance transformer. My 40m tunes 50ohm at resonance with 6 turns. The same loop tuned to 20 only needs 3 turns and I have to wrap the feed winding around the antenna loop for best match. That’s on a 5m circumference loop I’m now trying to get the smaller 3m loop to tune 10m and having problems as the loop is a little long and I can’t get an impedance match at resonance Looking at gamma matches and coupling loops to get it to resonate at 28MHz. I have found if you can get the SWR dip to correspond with the loop resonance, you get better results than when the SWR minimum is different to the resonant frequency of the loop.
If I may, I would like to suggest an experiment. Here is the basic idea: Measure the field strength you make several meters away The loop's tuning capacitor has quite a high voltage on it at the RF frequency. Rotate the antenna so that the capacitor is to one side in the middle. Make a short fat dipole antenna. As we know a short dipole looks capacitive. Mount this dipole at the capacitor vertical and connected to the capacitor Trim the tuning. Check the field strength again. I think the dipole will add signal as seen off in either horz direction but not straight up. Thus more power will be sent where you want it.
Thank you. You mean to made a directional magloop antenna? Hmm.. could you send me please a sketch or diagram of it? For my better imagination? I may to try it...
Paul, thanks for another excellent video. Your videos are among the very best on RUclips. The video/audio quality is always excellent and I truly envy your construction techniques.....outstanding! keep up the great work! 73, George K2WO
My pleasure George! Thanks for this very nice comment. It gives me more motivation to do more videos! :-) Have a nice day and thanks for watching my channel ;-) 73 Paul OM0ET
I was beaming west that time 15m , ant 4 el quad, hearing you with 5 watt impossible with ant away from you, if ant was your direction it would work. 73 de LA4UOA.
Hey Preston, nice to meet you again! Thank you for the nice comment. I want to make this antenna more and more practical and better. This is one of the other modifications :-) Have a nice day my friend. 73
Very nice setup!!!! I want to build one of these myself. Do you have specifications, suppliers, especially for the variable capacitor?? I am wanting to get something that I can use portable to run QRP for Parks On The Air (POTA). Thanks for excellent videos!!! Juddie WD8WV
thank you PAUL for sharing I ask again to activate my callsign because I stopped for 10 years and I should resume F5OKB. I would like to realize your antenna but I can not find the variable capacity. Can you give me a link to buy this capacity? the top would be able to one day copy you with your antenna thank you very much PAUL and 73
Hello Pierrot! Thanks for your nice comment ;-) For your own project you can use for example this capacitor on Ebay: www.ebay.com/itm/Air-Variable-Tuning-Capacitor-ELTRA-Dual-Gang-380-320-2x14-7pF-1pc-new-/291923147870?oid=291970236315 I hope to hear you one day from loop to loop ;-) That would be great! Hi. 73 Paul OM0ET
@@OM0ET thank you PAUL I start the reception of my call. I will also mount this qrp which I think will make a good together for qrp performance thank you again. f8bdx.free.fr/_bitx_3414.htm
A bit of a late note but I hope this helps: If you make two turns around on the main loop and add a switch to the capacitor box, you can run the two turns in series or parallel. When in parallel it looks like just one turn as usual. When in series, the inductance is almost exactly 4 times as big. I have (in the distant past) made inductive loop antennas for AM radio frequencies. They had more turns but the idea is kind of the same. I had to carefully tune to get good reception but the experiment worked.
@@kensmith5694 The penalty in efficiency is enormous making more than one turn. I made a 40 meter loop with two turns and it obtained only about 1/4 of the signal strength. It tuned, but it is not efficient.
@@thomasmaughan4798 You need to space the windings and you also may have to use wire rope. You need to fight the proximity effects as well as the skin effect. The smaller diameter means the current is much higher for the same radiated power.
vy nice Puol my new antenna of your production I can't wait to try it soon. we resent in private. Thanks for the video and good qso in qrp ... 73 de in3ufw Marco / OK jn70
![40M UltraLight QRP magnetic loop antenna + TEST [ XIEGU X5105 ]](/img/1.gif)
That’s fantastic. It looks well made, clean design, should hold up well. Very fine indeed.
Thank you John, I do my best ;-) although the propagations could be even better :-) hi hi Best 73, Paul OM0ET
The modification make the loop more portable and easier to use. Thank you for the video.
Yes, completing of this antenna took me about 2minutes now without a screwdriver ;-) 73, Paul
Coupling is the Key. Grand video.
Thank you! 🙂👍
I'm following you wherever you are cause you make a very simple video.
Your contacts are amazing with magnetic loop.😜 indoor. 73
Thank you Luca! :-D hihi. My pleasure! :) 73
Hi, I like your coupling setup. Have you tried using different coupling loops diameter? Different coupling loop diameters on different bands improve efficiency and your mounting system would make this easy. Great setup. Thanks for sharing.
I saw this video some time ago and remember what a good idea that was.
I’ve always used T240-43 toroids as a n turn : 1 turn impedance transformer.
My 40m tunes 50ohm at resonance with 6 turns. The same loop tuned to 20 only needs 3 turns and I have to wrap the feed winding around the antenna loop for best match. That’s on a 5m circumference loop
I’m now trying to get the smaller 3m loop to tune 10m and having problems as the loop is a little long and I can’t get an impedance match at resonance
Looking at gamma matches and coupling loops to get it to resonate at 28MHz.
I have found if you can get the SWR dip to correspond with the loop resonance, you get better results than when the SWR minimum is different to the resonant frequency of the loop.
Hello Paul! we spoke on 17m!!! congratulations for your videos!!! it's alwais a pleasure to Watch it!!! 73!!!!!
Hello Frederic, nice to see you here on YT as well. Thank you for your kind comment and QSO on 17 today :-) Propagations are poor as usual :-) 73 Paul
Twoja antena wygląda super .
If I may, I would like to suggest an experiment. Here is the basic idea:
Measure the field strength you make several meters away
The loop's tuning capacitor has quite a high voltage on it at the RF frequency.
Rotate the antenna so that the capacitor is to one side in the middle.
Make a short fat dipole antenna.
As we know a short dipole looks capacitive.
Mount this dipole at the capacitor vertical and connected to the capacitor
Trim the tuning.
Check the field strength again.
I think the dipole will add signal as seen off in either horz direction but not straight up.
Thus more power will be sent where you want it.
Thank you. You mean to made a directional magloop antenna? Hmm.. could you send me please a sketch or diagram of it? For my better imagination? I may to try it...
@@OM0ET
I haven't made a picture of it yet, it is just an idea.
Paul, thanks for another excellent video. Your videos are among the very best on RUclips. The video/audio quality is always excellent and I truly envy your construction techniques.....outstanding! keep up the great work! 73, George K2WO
My pleasure George! Thanks for this very nice comment. It gives me more motivation to do more videos! :-) Have a nice day and thanks for watching my channel ;-) 73 Paul OM0ET
I was beaming west that time 15m , ant 4 el quad, hearing you with 5 watt impossible with ant away from you, if ant was your direction it would work. 73 de LA4UOA.
That's what I need! Great video. Do you have a tutorial for build it?
do you have a specifications and list of materials needed to build that magloop antenna?
Been watching the evolution of your mag loop. Each upgrade/improvement has been really great. Wish you were selling these loops.
73
wd4dda
Hey Preston, nice to meet you again! Thank you for the nice comment. I want to make this antenna more and more practical and better. This is one of the other modifications :-) Have a nice day my friend. 73
Very nice setup!!!! I want to build one of these myself. Do you have specifications, suppliers, especially for the variable capacitor?? I am wanting to get something that I can use portable to run QRP for Parks On The Air (POTA). Thanks for excellent videos!!! Juddie WD8WV
Здравствуйте! Я бы хотел приобрести у вас антенну. Это возможно?
thank you PAUL for sharing I ask again to activate my callsign because I stopped for 10 years and I should resume F5OKB.
I would like to realize your antenna but I can not find the variable capacity. Can you give me a link to buy this capacity?
the top would be able to one day copy you with your antenna
thank you very much PAUL and 73
Hello Pierrot! Thanks for your nice comment ;-) For your own project you can use for example this capacitor on Ebay: www.ebay.com/itm/Air-Variable-Tuning-Capacitor-ELTRA-Dual-Gang-380-320-2x14-7pF-1pc-new-/291923147870?oid=291970236315
I hope to hear you one day from loop to loop ;-) That would be great! Hi. 73 Paul OM0ET
@@OM0ET thank you PAUL I start the reception of my call. I will also mount this qrp which I think will make a good together for qrp performance thank you again.
f8bdx.free.fr/_bitx_3414.htm
nice addon :-) congrats Pavol
Thank you very much Erwin ;-) 73
Any plans for a motorized tune option ? I find there is very few with this so could be a great niche for you to expand sales
Yes it is still as a functional prototype version. I just need to fix a few details 😉👍
LA4UOA is from Norway, not Finland. 73 de TF3AO
Ou sorry, you are right I make mistake... :(
Very nice. Where did you obtain the plastic clamps?
Thanks 😉👍 The supplier company selling these with the PVC pipes. It's from a local hardware shop. Best 73
@@OM0ET Thank you.
Hi,
It looks very cool!
What type of coax you use for big loop?
Thank you!
Thank you! It's H1000 or in video here: ruclips.net/video/B6gYmXz9CxA/видео.html
Nice Mod,
Hi, like the loop & your mods! I also work QRP, what distance have you worked & where are you living? God bless, Bill (G6ATO)
Thank you! 😊 I did a QSO's across the Europe and Russia with QRP 5W on PHONE. It's great little indoo/outdoor antenna 😉👍 73.
Hello;
Can you show us how can you do this connector? I want to do this.
73's ta2igs
Hello, yes I can do a video about it, stay tuned ;-) 73! Paul
Will adding 80 meters be too complicated? Just wondering. 73
80m could be done by adding additional capacitor. But by this diameter it will work effective only on receive. 😉
@@OM0ET Thanks.
A bit of a late note but I hope this helps:
If you make two turns around on the main loop and add a switch to the capacitor box, you can run the two turns in series or parallel. When in parallel it looks like just one turn as usual. When in series, the inductance is almost exactly 4 times as big.
I have (in the distant past) made inductive loop antennas for AM radio frequencies. They had more turns but the idea is kind of the same. I had to carefully tune to get good reception but the experiment worked.
@@kensmith5694 The penalty in efficiency is enormous making more than one turn. I made a 40 meter loop with two turns and it obtained only about 1/4 of the signal strength. It tuned, but it is not efficient.
@@thomasmaughan4798
You need to space the windings and you also may have to use wire rope. You need to fight the proximity effects as well as the skin effect. The smaller diameter means the current is much higher for the same radiated power.
looks pretty nice Paul !. vy 73 de HB0BB Fredy
Thank you Fredy! ;-) It's much easy and fast to connect the coax feed line to the small loop :) 73, Paul
thx
vy nice Puol my new antenna of your production I can't wait to try it soon. we resent in private. Thanks for the video and good qso in qrp ... 73 de in3ufw Marco / OK jn70
Thank you Marco. Yes I will finish today or tommorow for you :-) 73
Looks Great! Keep up the good work! KX4EZ
Thank you very much 😉👍 Best 73. Paul OM0ET
LA is Norway
74 OM O ET