UltraLight Magnetic Loop Antenna + XIEGU X5105
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- Опубліковано 25 січ 2018
- How i made portable version (pedestrian version) ultra light Magnetic Loop Antenna. Weight only 530 grams. Covers from 40m up to 10m bands. No switch is needed. It's a QRP version for 5 to 10W max.
MORE INFO ABOUT THIS MLA ANTENNA:
www.om0et.com/ultralight-mla-m...
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That is awesome Pavol, sure likes 20 meters that is for sure. Even 17 is a nice swr for sure and decent bandwidth when tuned. Cheers Fred
Thank you Fred! After upgrade of this UltraLight MLA is SWR 1:1 on all bands from 40m - 10m. Now i just wait for better WX condx. I hope will hear you on such a small antenna too lol :) 73
Very nice job! Antenna is great and radio is great too! Thank you for this video.
N0TRJ Ham Radio thank you very much
N0TRJ Ham Radio thank you very much
looks great, would love to get a hold of the parts to make one for my X5105. may have to do some saving up for this
Thank you. Will be interesting to operate with this MLA on portable outdoor.
I have found the exact same capacitor as yours (320+380 pF) on eBay for $20 in Bulgaria. I've bought two and I will make the same antenna!
That's great. I recommend to you build a 4th version or 3th one 😉👍
@@OM0ET Thanks for the hint and 73's de F1SLS ;)
Hey dr op. What RG type cable is the main loop made of? And which scheme did you use for connecting the RG58 small loop at the ring/shielding? Thx es mny 73.
Is your antenna a resonant shielded frame? In the center of the loop, the screen should be cut, in the same place, the connection loop is connected in the form of a small circle.
Very good job. My next antenna build is a magnetic loop in the same frequency range as yours, I'm planning on using a capacitor out of a full power tuner. I have an old Amp Supply AT-1200, I also have a 10-foot 3/4-inch copper tube, since I already have the copper, I will go with it. I's nice to have an analyzer built into the radio, I use my G90 in the same manner. 73's🎙KD9OAM🎧
Hello, great video of your Magnetic Loop. I have a question, how long is your thick coaxial cable that you made as a big ring? 73Jörg
I made a couple Magnetic Loops. My best works for 15 threw 40 meters.
That variable capacitor has two major sections of different sizes.
They are probably for an AM radio. (MW & LW) The left hand section is about 500 pF the right hand is about 350 pF.
There are also 2 small, extra segments on the same shaft which are very low..
perhaps 15 pF . They would have been for FM radio tuning.
If you seek as high capacity as as possible, parallel them in as well.
It won't add a lot but every bit counts.
EA3BV
Thank you.
Paul, I love the video. I have a Xiegu G1M SDR QRP. I will build a similar antenna (waiting on a variable capacitor from China - similar to yours - 2 ganged 350 pf).
I am interested in the actual wiring setup. Did you join the center conductor and the shield at each end of the large Primary loop? Or did you simply use the center conductor inside the shield. I am thinking of joining the braid and center conductor at each end of the Primary loop, where they connect to the capacitor. [Edit: I see you left the shield unterminated and even with a few cm gap on the opposite side]
Also, have you simply left the ends of the Driven loop twisted off (it looks like) and unterminated? VK4FETC [Edit: I saw in another of your vids what you did - many Thanks]
Excellent! I might try to build one! Thanks and 73 de K2CJB
Hi Paul,
Many Thanks for another great video about magnetic loops.
I've been thinking about one for much higher power output, which will also obviously require a much larger spaced capacitor. However, due to the high Q of the magnetic loop, have you thought about putting a much smaller value variable capacitor in parallel with the main tuning capacitor. Maybe start with the fine tune capacitor at somewhere between 1 quarter mesh & 3 quarters mesh, and then tune the main capacitor in your normal way, followed by finer tuning with the secondary smaller variable capacitor. A field strength meter attached with its pickup antenna close to the mai large loop may simplify tuning & increase tuning accuracy, especially when fine tuning with the smaller capacitor in parallel with the main tuning capacitor.
I would be very interested & greatful to see your thoughts on this.
Once again Paul, Many Thanks for your brilliant antenna projects videos.
73 De M0RAY,
Sittingbourne,
Kent.
UK.
Most interesting project. Amazing results. And quality video.
I am building a very similar antenna, and will watch your progress with interest.
Nice! Watch also my latest videos with ver.3 and ver.4 ;-) 73
Paul love the Ant Analyser on the XIEGU X5105 . That is really useful. 73 once more, de John - G0WXU
Hello Paul, can you please give me a detail of how the small loop is connected? It does not look good on the video if you connect the central element with the mesh or how that connection is made.
thank you very much
HK6PAN
Pablo Andrés Naranjo Echeverry hello! 😉 I added the schematic diagram on the link below in video description. There are nice fugured out all details for you. If you will need help let me know please. 😉 and thank you very much for your interest.
Экран кабеля подключается к конденсатор, а центральный провод куда подключить.
My dear friend is the main loop diameter 45cm..is it...thank you for your reply...Ta3le..73...
Hello Paul, very interesting built of a MLA. Have been experimenting myself but have a larger size loop. This one is smaller but seems to be working well. Have 2 questions: Don't you have problems with tuning, I'm not shure your capacitor has reduction? And question 2 is: Could you tell us the length of the coax you used for the large and the small loop. I like the way you routed the coax through the tube, never thought of that. 73, Bas PE4BAS
Hi Bas thank you very much for you interest of my MLA. Lenght of main loop is 1190 mm and small loop is 445 mm. Small loop is no more made from coaxial cable. Now after i did improvements is made from 2,5mm thick solid core copper wire, let see my 2nd video after improvements here: ua-cam.com/video/Nfundq0cC7o/v-deo.html
At 1:40 you can see a small gearbox like reduction on capacitor. Tuning is not so hard to tune. Harder is to prevent little capacity change while is hand close to the tuning knob. Because of that you have to tune it little bit lower than is the best SWR position. When will be your hand away so MLA will resonant higher. It's about 3-5kHz change in my case.
Would you recommend the MFJ-9232 QRP LOOP TUNER? 73s. Really enjoying your videos.
Hi Jerry. Thanks for watching my videos! The MFJ-9232 tuner looks like very interesting thing. You will no need matching your loop with small loop or with gamma match. And you can change more loop sizes, one for 40m or other for 20m. But this price. 60USD + shipping is a lot by my opinion :-) 73
how big is this antenna? PY1LHL
This could be OK but would be better with gearbox on it. Tunning is very very fine so without gearbox you will have problems correct tune to the frequency. 😉
How close does the driven element have to be to the main loop? Did you play with varying distances between the two?
Barry Mercer it has to be as close as possible but it has not to be electrically touched each other.
Thanks. I enjoyed your vid and used it to make a similar loop! However, it is still to cold to go outside and play with it. Tell me, how do you like the Xiegu?
Barry Mercer Yes the Xiegu X5105 is an excellent radio. I like him very much. I sold my ex Icom IC-706MKIIG and bought this one. And i am very very happy with it.
Wow Nice!
Hello next great video
Good ideas. Got a little seasick watching the moving camera. I made videos for 30 years. The point of the motion camera is for the subjects to move NOT THE CAMERA. Devise a homebrew tripod for your camera, or buy one. The PVC mount seemed to have changed shape from the start to the end of the video. These are wonderful little antennas, and the ideas in this video are very solid. I look forward to making one.
Richard Schneider thank you. What program could i use to edit my videos please? Your recommandation? Thanks 😉
heiio Paul!
where can I see the exact scheme of your antenna?
I'm interested in connecting a small loop and capacitor.
73! RW9RN
Hi Andrey, if you want schematic diagram so i have to draw him. If i will done it i will put a file link in to this video description. OK?
excellent Paul!
I will wait for the link. this is a very interesting antenna for my summer cottage.
73!
Hi can u tell me the length of the thick coax and the small coax length pls de M0YQQ
Hello Steve! The ver.4 has 3m main loop and 0.720m small loop. 73, Paul.
Can you share any detail of how you closed the small loop? Did you just solder the shielding to the center?
Center is soldered to the braid 😉
Actualy rg 58 connected on small loop above and it runs near to capacitor,it is not cleared the actual connections, whether the coax is only connected to upper loop or it is interconnected too.and, if it is connected on upper loop then both the end of small loop connected with coax shield and core both?
I am disabled and could not build such an antenna. Would you be able to build one for me or recommend a commercial antenna of similar dimensions. Cost is not terribly important. Thank you, Mike, N0WDM
Hello Mike. Thank you for your interest of my loop antenna. I build and also sell this antenna but only V.3 and V.4 .
Ver.3 is 85cm diameter and ver.4 is 1m in diameter. Ver.3 is for 10-30MHz and ver.4 is for 7MHz - 27.5MHz.
Hello Paul, What is the emetter of 10.10 Mhz, I receive the same noise in France on the same freqency . I don't know from where it is coming . 73, F1HLF Serge
It's probably Weather RTTY station (Signal is 50 baud, 425hz shift, normal polarity)
@@OM0ETThanks Paul, I found it , it's locates to Pinneberg, just near Hambourg in Germany. The callsign for this frequency is DDK9 and the transmitting antenna is located at Pinneberg northern Germany. Best regards. Serge F1HLF
@@beot7248 Thank you Serge! I will know now ;-) Have a nice day! 73
Great video and antenna design, mag loops are really cool.
how much would you say it cost you to build? Also have you tested general Rx/Tx indoors?
73,
KE8GAH
Lync Volt the build price could be around 20€. Piece of PVC tube, small plastic box, short piece of coax, piece of copper wire and feedline with PL connector. To see how its works please visit my video list. There are few videos working QSOs with this antenna. 😉 73
Wormant is in Micro Bandas youtube page
3:39 HOT POLE (or central pole) not connected? Did you connected to condensator only to the cold pole of the coax cable?
Yes all my magloops are connected to the center cores of the main loop coax.
@@OM0ET 3:39 in this image i can see the condenser connected to the cold pole of the 2 connectors SO239, not connected to the center core of the SO239 connector. Is it correct?
@@mrtonicsvls3624 oh yes, in the 1st version I tryed connect to the outer shield, but i changed this configuration later.
@@OM0ET Perfect!
What confuses me is that the loops are made of shielded coax which blocks signals. Why isn't it better to use exposed copper?
Hi Golan, the shielding of the main loop never should be grounded if you use inner core as radiator. But you can use shielding as radiator too, but there is a problem when are used PL connectors, because of poor electrical connection will cause this tiny spikes as you can see here: 11:05 After this video i did few upgrades and one of them was that now i use inner core as radiator - there is a much solid connection and this spikes dissapeared. ;-) btw. shielding can be used as the prevention against strong electric noise, but i am not sure of that in this case.
My antenna is working excellent now after upgrade what i mentioned before. There are not any spikes/peaks anymore at antenna analyser graph. Inner core is connected only.
My question is on this cable used as big loop.as it has shield of corrugated copper thin film and not the smooth shield (as it is not seen in the cable used as it is already ended with pl 239 connectors.) Will it effect. As some doubt raised here is cleared by use not to ground the shield.but if I want to use this thick cable as VHF radia as shield and not middle one ,can I use it? If yes , what the effect on antenna?
where did you get the capacitor ?
Francis Farmer it was just from second hand :-)
Hi Paul, You never mentioned the size of the loops ???
Hi TheBogim, here is my website with more details about the loop 😉👍 www.om0et.com
Hello, thank you very much for the video. With a variable capacitor of 30 to 350 pF could you make that same antenna?
sierpes hello! Thank you very much for watching 😉 This capacitor is 320+380pF. So if you use only 320pF it will work only on less bands not as this one (from 40m to 10m). 73
Hello the effectiveness of the loop would greater if you increase diameter of loop closer to 36_39 inches adjust small loop to suit good luck steve gw7lop
Steve Edwards Thank you Steve, but this loop is pedestrian mobile style, so it must me small and light to hold it in one hand. ;-)
Hello. From Argentina want ask you, what do you knou about wormant antenna? Thank for your answer
Sorry, I never heard about such kind of antenna. Do you have any link please?
@@OM0ET ok. UA-cam page of Micro Bandas describe the wormant
@@OM0ET Paul the wormant is EA1HBX invention. He show videos by youtube about this
@@OM0ET sorry my ingles linguage is not so good
Hi Pavol .., im planning to build one of this antennas because in the house that i live .., i can't install big antennas :( .. could you share me more details about the size of both loops. This is XE1GSY .. 73.. !!
Hello! Sorry for thet space restrictions over there. For more informations try to visit my website here: sk-tech.sk/om0et/ultralight-mla-ver.4.html
73, Paul.
Thanks Pavol .. for your help .., and thanks for all of your videos sharing very good information ., 73.. from Mexico !!
@@pianistman2006 You're welcome my friend! Thanks for your support! 73 from Slovakia! :)
well made and nice video thanks for the hints de 2E0LGZ
Thank you very much Gary! ;-) 73
do you sell this antenna?built or kit? 73 de HB9GNK
steadfast666 i sold one for 60euros. It was complete antenna.
What would be the price with shipping to switzerland?
Send me please email and i will look for courier and the shipping price for you to switzerland. OK?
Realy nice job
Thank you! 😃👍
@@OM0ET i need to know how to connect the capacitot to loop.
I have a capacitor homemade found in a shop. It's bìg, 35pf-300pf. The loop is a 100 cm of diameter. People said is enought a 100pf capacitor but i don't have it 🙄. How can I send you a picture of my capacitor? No facebook, no instagram....
73, from Italy. Luca
@@OM0ET i' m a follower of OM0ET
@@lucanissoli9901 Hello Luca. Look at this picture, maybe it will help you 😉👍
www.sk-tech.sk/files/ultralight-mla-om0et.pdf
@@OM0ET thankyou🤗🤗🤗 you're the best !!!!
Nice job ! 73 deF4DNP.
Merci 😉👍
Have you tried to tune it down to 80 Meters band?
PhilsLab no i didn't. I suppose that so small diameter should be not usable on 80m.
I am planning to make one of those www.alexloop.com/artigo16.html 80 meters is the only one band where I was get at least something using SSB6.1. I have hope that a mag loop antenna will be useful there. Unfortunately I cannot make large antenna. I need something under 90cm in diameter.
yes, a couple of loops should work 80 meters. One loop is not enough.
Yes. I did my research there, ideal loop should be around 3m in diameter which is totally not feasible for me.
PhilsLab oh yes i can imagine that lol. :-) Two turns of 1.5m diameter could be much practical.
I hold the coax in place with zip ties.
I don't think leaving the copper on the PCB is a good idea. when the antenna works at high power, it will get really really hot.
captain Liang yes i tought that i will isolate screws from copper layer because it causes little frequency change when my hand is close to tunning box. There is used small high capacity capacitor so this antenna is only for QRP power 5W.
uh... yeah, it's not a big problem for QRP operation. I have built several loop antenna which the structure of it just like yours. one time I operate 50 Watts in CW mode about 1minute, I smell that something is burning up and I found the knob on the tuning box is so hot that I cannot touch it, but the capacitor is not hot. when I remove the small aluminum sheet from the knob, the problem solved. my best range record with loop antenna + 0.5WATTS in CW mode is about 8000KM on the 15meter band, but I screw it up because I was too excited to send Morse Code by straight key.
Fantastic build and explanation OM. 73 de Paul. N0AH
Thank you! 😃👍 73
MFJ should stop importing and supporting Chinese Radios.
What's wrong with Xiegu radios?
@@OM0ET My point is I don't care what is wrong with Chinese radios they are ripping off Western Technology! They are not getting my money.
Nice antenna! I want to build a 10 meter Loop. thanks for the reply.
@@n9oqu thank you for your point of view Bob 👍
@@n9oqu Once i was using my home made Magnetic Loop antenna as the base one. It was able to handle just 25W, but even with this low power i worked with VK, ZL, JA and W too. Loops are very practical antennas :-)