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HAM RADIO: Magnetic Loop Antenna : Figure of 8 Mag loop : 40M & 80M Finished.
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- čas přidán 2. 01. 2022
- We are finally here, the finished loop and well, was it worth the wait? after a redesign to the capacitor and loop connections, finding out that I needed more capacitance than I had, and battling with the weather it is up and working.
It is big and beautiful, Well big anyway.
Still have fun and give it a go...
Please subscribe and like.
Cheers and Many thanks for watching
Mike - M0MSN
P.S. do not take my word for it, give it a go for yourself.
More antenna build to come♥️.
It’s a beast! A nice one at that 👍🏻
I wish you happiness, a healthy, successful year 2022 Boštjan🎊
Thank you and to you too.
nice build mike all the best andy p M7XAP keep up the good work
Thanks 👍
Another great video thanks for the upload.Thanks for leaving the part with your wife asking you to get the cat in it did make me smile the way she called you Michael.Have a great day and all the best to all.
😀😀😉🤣
Great stuff Mike , very interesting 👍👍
Brilliant Mike would look good at bottom of my garden 😄
Really Nice build. Really cool to see it step by step. Thanks for sharing!
Cheers John 😀
Good to see that the solar power array on the roof is not causing daytime interference - I wish I could say the same. Several nearby installations are driving me loopy ! :-). Happy New Year Mike. M7BLC
Awesome video Mike, thanks for the explanation of dual band ability of the figure 8 makes more sense now. Guess upsizing it is the next step to get your magical 80/40 or go all out for 160/80. Now it needs a rotator to get the directivity to beam where you want it to land.
Yep rotating will finish the whole thing 👍👍
A very happy new year to & yours, Uncle Mike. 73 de Your Friend Uncle Guenter 💯🎸🙋♂️
Same to you Uncle Guenter.
Very nice job Mike, Planning on getting loopy here too!! (Incidentally John G1GDS is trying to get in touch ref capacitor plates) 73 de GØUSL Happy New Year
Yes I am first. Happy New year to you and your family Mike.
Had to comment before I watch the video.
Great video all above my head this stuff but still a good watch Mike. Nice job.
Motters M7TRS
Happy new year!
Oh...you know it's serious when she uses your full name. 😊 Stop the world, the cat needs in.
Nice work on the loop Mike, I enjoyed the video series. I didn't realize you were so short until you stood next to the loop. 🤣
So what happens now? Revisions to make it play on 80 meters or settle for a really nice 40/20 loop? Either way, I think you did a fantastic job. That capacitor needs a clear tube to display your handy work.
Another interesting video, and a win I reckon. Nice qso up north without a lot of noise it would seem.
Congrats and 73 zl3xdj
Yes Brian, very pleased.😉
Tell him to bloody knock like everyone else does 😉🤣
Hi Mike have you considered switching in some more capacitance when you want to try 80m - maybe you have a trombone lying around somewhere?? Also I agree with wecb640, you should use some thicker wire...coax braid perhaps (i use strips cut from 25mm copper pipe) for the interconnects. Excellent work de m0tfy
Not concerned about the wiring on the capacitor as I intend to remove and upgrade the whole thing again shortly, but thanks for your Input.
Just a thought Mike, the loop that you drive that with (the 70cm one), try squashing it a little so that its not round (so that more of the lower 1/2 is closer to the figure of 8) - this (in theory) improves the coupling and can raise your output RF quite a bit, found some information about that whilst looking up designs for building a loop myself (that I never got around to) :)
It works very well Mike - a lot of effort and it has paid off. It is bloody unsightly and awful to look at and thus is a ironic piece of post-modern lawn art. Well done - I genuinely think it is fantastic. Ugly as hell.........but fantastic.........:). Science in the kitchen right there. Brilliant.
Yes the cost of success Bloody ugly loops (Anne-Marie has already asked me how long that Ugly thing is going to be there?).🤣🤣🤣🤣
3:30 be careful when connecting copper wires with zinc-plated washers and nuts. These metals form a galvanic pair. The copper part should be tinned, and the whole construction covered with a varnish, if possible.
Very impressive build, Mike! The fully enclosed air capacitor is spectacular and my favorite part of this build! What's the advantage of your figure-8 loop over, say, a 5M circumference single loop? Is one more efficient or better at DX-ing than the other? Have you been able to reach across the Pond with yours yet? Great build, and Happy New Year!
73 KD2ORG
can add a 100pf15kv constant capacitor at 80m and tune only with what you have built
MM0IMU
Hi Mike, well done. A comparison with a single loop on 20m could be exciting. Have you possibly already compared? 73! Ralf
Next job Ralf..👍
👍
I always enjoy watching your videos
Fascinating, you don't say how tall you are but I'm guessing the loop is 10 to 12 foot high? It's good to see that even well grounded antenna gurus (pun intended) and CZcams megastars have to stop for the cat. Just the same as us mere mortals really. 😉
Lol the Cat comes before everything so my wife informs me…😂😂
Interested to hear of the motivation on the loops since they are not an easy or cheap antenna. Space, noise or just plain curiosity? ps Appreciate the holiday season posting, it's a bit quiet ATM 😀
Sounds good!
Hi Mike … thank you for lots of great video’s … did you compare your 20 meter loop to any other antenna, like 1/4 ground plane ? I am interested to understand how it compare at low angles.? (DX)
Hope to meet you on the band some day 🤠 thanks
Niels OZ1CGQ
Great video Mike !! Really enjoyed following this ! Aside (inspired by cat) - not sure who is in the household, but do you announce to them that you are about to record? I know you can edit out things but generally the video filming appears smooth without interruptions. During summer / autumn 2020 I was filming training videos at home in the lounge using a green screen etc (for day job due to Covid closing hospitality_) and it was always a battle to keep everyone (wife, sons, animals) and everything (washing machine etc) quiet! Cheers, Mark, 2E0MSR.
lol, Quiet on set, action.......never makes any difference -- my wife says " I bloody live here as well". 🤣🤣
@@mike-M0MSN yep, I am told exactly the same :)
Mike, I very much enjoy you videos on mag loops - tends to brighten up the dark Swedish winter days :)
In this video, you say that the loop is only 40-50% efficient on 80m whereas it is 80-90% efficient on the 40m band. My problem is that I don't understand what you mean by efficiency in this context. Is it efficiency in the sense of ratio of the power radiated from the antenna relative to the power delivered to the antenna? If so, how do you measure the radiated power? Please enlighten me :)
I will answer that question a little later, but you can read a bit more about that here. www.66pacific.com/calculators/small-transmitting-loop-antenna-calculator.aspx
Got a video for gmrs antenna?
Hi Mike, well done on building the loop. Personally I think it looks brilliant. One question, I see that the coax connected to the driven loop is connected one side to the centre of the coax and one side to the outer screen. Does the radio not see it as a dead short? Or am I missing something and need to read up on loops? Cheers, Carlo.
You can't look at it in the DC domain. Like a transformer at DC looks very low resistance but in the AC domain its impedance is a ratio of the other coupled windings, in this case the Figure of 8 and the Capacitor form a tuned circuit. Whos impedance couples to the driven element once coupled become 50 ohms or there abouts. I hope that helps?
Aha, thanks for the info Phil.
Thanks Phil, could not have put it better myself. HNY chaps
@@mike-M0MSN HNY to you as well. Apologies didnt mean to steal your thunder.
Hi Mike
What is your final assessment? Is it worth the effort compared to a single loop? 73 Ralf
No
Unrelated question, I was curious about how you make your thumbnails. I have a side channel where I was going to post study info for the FCC tests and was curious how you and Callum make them.
either photoshop or gimp. any image processing will do the job.
I use. canva.com
What size single loop would work over 40 & 20 mike
5M circumference or 1.5M Dia. Will do both 20 & 40.
@@mike-M0MSN thanks so best for outdoor use ,what wire would be rigid enough at budget
In this project, can you show the dimensions by writing? sorry i don't know the language. Or is there a link to the project? 40-80 m antenna with helliax . detail size please. 73. TA5MEX from türkiye
Length of the Coax is 10 Metres 2x5m loops (20mm Heliax) see f5ad.free.fr/Liens_coupes_ANT/G/PA9OK%20Boucle%20magnetique%20en%208.htm
If it was me I. Would try and make one big loop then it will go on 80m and Just about 160 m if I have worked it our right de 2e0ree
Hi Andy, funny that Callum and I were just saying the same thing.
Your Uploaded video gives a good time.
Ease your stress with a Ukrainian/Russian music video.
R@d Done B0tton. Great Power. aaw
They said you're an all rounder but it turns out your completely loopy. You've gone round the bend.
Obay ? Is that near Bombay ? I knew a major who took his bird to see India. At the oval.
So, you want one prawn cocktail and a Waldorf salad ? Right, order, orders which must be obeyed. Don't mention the war. I did but I think I got away with it.
Can you do Jimmy Cagney ? Oh please try.....
This video is pure click bait! You've got suggestive bananas in the thumbnail but all the measurements you gave were in metric. Disappointed. On that basis I give this video a reluctant thumbs up, but only because the project has been really interesting and taught me a bit. p.s. Nice build.
lol