ฝัง
- เผยแพร่เมื่อ 23 ส.ค. 2024
- Improved my great home made QRP UltraLight MLA antenna working now for 100% ok.
For measuring i used the QRP transceiver XIEGU X5105. SWR on all bands is min. 1.1
Working from 7MHz to 28.6MHz continuisly and CB band is covered too.
MORE INFO ABOUT THIS MLA ANTENNA:
www.om0et.com/u...
JOIN TO OUR NEW HAM FORUM:
/ qrpworld
MORE RELATED VIDEOS:
• ver.3.0 UltraLight Mag...
(3th version UltraLight MLA - foldable construction)
• ver.2.0 UltraLight Ma...
(2nd version UltraLight MLA - bigger brother )
• IMPROVED - UltraLight ...
(1st version UltraLight MLA - Improved)
• UltraLight Magnetic Lo...
(1st version UltraLight MLA - how to do)
• Indoor QRP contacts wi...
(QRP indoor QSOs with ver.2 UltraLight MLA)
• XIEGU X5105 and UltraL...
(QRP trip with MLA)
• QRP indoor Magnetic Lo...
(QSO with Peter HB9UQX)
This is freaking awesome, Paul. I love mag loops ! your antenna has a pro look.
Peter Eichhorn thank you my good friend. I hope for next QSO with you again! ;-)
Loops are good and have been using them for 23 years now.
When some hams are on mailing list saying bands are shut I am working DX with my X5105.
No antennas allowed and I have metal above me and below me and building is steel structure.
Not supposed to work but does well.
Your loop is very professional looking.
73 BOB AF2DX
Yes i had a couple QSOs from indoors and it was impressive, see here: th-cam.com/video/5vhuqIwj3R8/w-d-xo.html
From LOOP adjustment is a little better from the practice of GAMA adjustment. Because GAMA is fixed and does not move, it holds the SWR perfectly.LOOP adjustment, knows that the wind moves SWR.
Very nice solution OM for this Loop with very good SWR and results, good luck and 73, from PA
Thank you very much for kind words and watching my video 😉👍
The small coupling loop, adjust it to oval, you will get a better match. More of it will be in contact with the main loop. Try it. Report what you find.
Gregory Heath ok but for what is it good if the SWR is on all bands perfect?
OM0ET th-cam.com/video/2RDtm6qXjuI/w-d-xo.html
OM0ET I am building one too.
i've seen this video and now i better understand of you question. Yes i did it on my MLA. Let see the coupling space of small loop along with the main loop here: 2:18 its 55mm long space (under this grey plastic holder). Main loop and small loop meets togheter there in 55mm long line - not just in one small point.
It would be real helpful if you can make one more video and show exactly how you connected the small Loop coax together at the top and also show how you connected a solid copper cable to the end of your radio output I'm assuming that you just connected the hot only and no ground connection is that right would appreciate the clarification on those two things
Thanks for your replay. OK i will try to make another HOW TO DO video. 😉
I agree!! Thanks
@@OM0ET it's been 4 years - can you please make a video on how to build a magnetic loop, and show what the tuner looks like on the inside
Super 👍Very good praise from me.
Hi Paul,. awesome and beautiful! loop antenna, also seen your superb QRP contact with friend Peter HB9UQX. I am a SWL,. no license yet,. but ordered a little RS-958B. coming soon to me ;-) Paul, I wonder if are you planning to offer this "beauty" for purchasing from your web, as you have done with MLA ver.3/4 .. Looking all of your interesting YT videos,.. 73! , Pedro.
Hello Pedro! Thank you for very nice comment! 😉 Yes I sell the v.3 and v.4 but the v.1 is no longer in production due to lack of some important components. You can purchase v.4 when you will send me an email. I don't have an eShop because of it's still too complicated and expensive to me.
@@OM0ET Hi again, Paul,. definitively I falled in love with your beauty v.4 (Ø1m) MLA antenna!,. I don't know if I finally will get the license, so I'll use for reception for now, .. Paul,. could I get your v.4 for 170Eur+shipp.? (without tripod&bag; as you said as respond in a recent video). If you think it is fine for you, I can send and email to you for concrete.. I live in the north of Spain, Asturias,.. another wonderful place like yours Slovakia!, . with beautiful and lovely mountains .. and near sea). 73!, Pedro.
@@pruebasytecnica This is an old price. Here is my website with pricing too and my email. Send me an email if you are ineterested in of my magloop and I will made one for you ;-)
Thank you so much, for the great video and the schematic, i will give it a try, definitely! vy 73
Well done on the very nice build..hope to see you use it on the Air maybe when the Weather gets a bit warmer...good luck Steve Liverpool UK M0BFM
Thank you! I will :-) Can't wait for spring already. hi
Done!!!! This antenna works perfect!!!! 40 to 10m, better on 20m!!! i will send yo a picture!! TKS 73´s!!
That is a great news! Well done Juan. I will very appreciate to see your loop 😉👍
Congrats 🎉 on Your build
The x5105 has an embarrassing error in the vswr scale. 5 label is on vswr 6 and 10 on vswr 11.
Very interesting. You say that you are now using the INNER wire of the co-ax as the receiving loop? Is it shorter to the sleeve, or is the sleeve entirely disconnected? Have you tried it with a gap in the sleeve at the top of the loop, as I have seen in some designs?
Thanks Phil. Yes there are the other videos where I use gap in the outer braid in the middle of the coax loop. Currently I don't use the gap any more but the braid is still not connected to anywhere. Connected is only inner wire to the capacitor (ver.3 and v.4 - see videos) 73, Paul
@@OM0ET I see. Do you have a theory about this? Or was it based purely on observation and practical testing?
@@BarefootBeekeeper Yes it was based on my observations and practical testings... it works very nice for me ;-)
Very impressed with the neatness of the design and a usefull compromise good band coverage 7mhz to 28mhz ... can you cover 29.7 ? G4XRM ... My loops work but yours is practical .
bryfosk thank you very much! 😉 I think max. frq is about 28.500 MHz. 29MHz could work by smaller loop i suppose. I did not tryed it ☺
Sir,If you don't mind please make a Shortwave Radio antenna cause I live in India Kolkata here SW signals are too weaker.
I made them and sell them here www.om0et.com
Awesome video my good friend 👍
So the main loop is the braid of the coax and is not connected inside the box, this couples to the small loop for tx/rx. The capacitor is connected to the inner conductors of the coax, how does this tune the loop when the the inner conductor is shielded by by the outer braid of the coax loop. ?
Yes I use the braid as a big coupler to the inner loop. Therefore is the braid not connected to any part of the antenna. I achieve better SWR in whole antenna range. Strange but it works. Watch version 3 and 4.
How much does the diameter of the loop matter?
I thought you went to shpw your antenna performing. It looks too small for 40 meters. Well built but too small to be efficient in 7mhz.
Is awasome!!! I love this antenna!! Gona make one!! (God help me...)
Juan José Castillo Very good. Dimensions are in video description. 73 ;-)
OM0ET allready print the pdf!!!!! Tks 73's
Please let me know when your antenna will be finished. 😉
Nice work one question did you split braid on top section or did u leave it intact
No, braid is just not connected. :-)
What would it take to make this work up to about 25 watts?
You will need a bigger capacitor. This capacitor in the video works max to 20W. 73, Paul
Given the size, I assume efficiency on 40m is really low, isn't It?
Fabio Sona sure but which small portable or pedestrian antenna has high efficiency? It's all about the compromises. That ones or we can use much bigger antennas like LW, dipoles or verticals. But this antenna is very easy to put her in to backpack a go. ;-)
Of course
Not efficient at all given the diameter of the outer loop. I also make my own magnetic loops, but I have different size inner and outer loops to creat the most efficient magnetic loop for each band. My capacitors are a lot bigger too, 12 inches long. If something is worth doing, it’s worth doing well, else why do it?
Do you share your specs and dimensions for this loop?
Steve Tomlinson yes, dimensions are mentioned down in video descriptions. ;-)
it.s almost perfect in CB 73 de yo9doc
how to make that antenna?
I have tried your antenna on 75/80mtrs for receive only?
OOPS! Have you tried your loop on 75/80mtrs for receive only?
@@dandruff7807 no, I never tryed it on 80m. But with an additional little capacitor you can use it for receive only. With this diameter it will be very nonefficient antenna.
Can we buy one from you
:-) Hello Jeffrey! Here is my website. You can see there how it looks like: www.sk-tech.sk/om0et/ultralight-mla-ver.4.html
Qrp ist fun my tx ist auch xgiegu x 5105
Yes it really is 😉 I love the X5105 👍
@@OM0ET many thanks for you 59 for my tx🤓
Paul i will Establish a group xiegu x5105 Europa and will make a in telgram chat is open qrp xiegu x5105 germany is open for you
@@schwellenkleineisen There is already one running :) It's name is "Xiegu X108G/X5105/G1M/G90 facebook group" Many users are in already :)
PA3FWU
Always interesting these MagLoop Antennas. If you need more power, up to 150W HF, build this one: th-cam.com/video/cN_lmGRaqOQ/w-d-xo.html 73's from HB9AIS.
Thanks for the very nice video.
QRP bags me many DX contacts
73 BOB AF2DX
BOB LECK thank you very much Bob for watching my videos 😉🖒
Link off :(
Th3 Pingas™ ahh sorry, tomorrow i will repair it. Ok?
OM0ET OK Alright! hey that your radio that you rode with pieces from China, the one that picks 6 bands. Is it possible to change the 10m band to cb? (11 meters)
Do you mean Xiegu X5105?
Xiegu has pre-defined 10m band but you can programming CB channels to the channels memory mode. And then you can easy use it as CB radio. Or you have VFO-A and VFO-B. So on VFO-A you can use only ham bands and on VFO-B you can leave the CB frequency (27.555 USB) and that's it.
If you mean home made 6-band SSB transceiver so it has also pre-defined program to switch 10m band front end filter when is tuned frequency around 10m band. Probably is possible just tune front end filter for lower frequency as CB is and it could work also because it's very close to the 10m band.