Rectangular Loop Antennas for Small Gardens
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- Опубликовано: 5 ноя 2023
- The rectangular Loop Antenna is not that well known. Yet it offers some interesting qualities including gain and low angle radiation. Peter G3OJV, takes a closer look and outlines how you can build your own, easily and cheaply.
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Hi Peter, really liking your videos as of late. Couple of things spring to mind when watching them....firstly at no point are you using any of these video's created from your home to promote your business which is think in itself deserves kudos. And secondly, your are realistic in what most of us hams have for back garden space along with budget....no huge 100ft towers with a tribander on top. Really shows that you are aware of a lot of the U.K amateur radio users wants and needs right now with these videos. Thanks and all the best, Mike 😁👍🏻
Thanks Mike, you are very welcome.
Top Video from a Top Operator/Musician. My EFHW 80->10 is supported on 3.5M Bamboo Canes 🙂
Many thanks. 73 Peter.
It's hard to wrap my head around that you started in radio in 1960. I was born that year! 😅 It would be interesting to hear about how you got into Amateur Radio AND the amateur radio business! 73 DE W8LV BILL
Hi Bill. I might cover this in a video sometime. But there were quite a few school boys of my age, who were fascinated by radio and the developments. 73 Peter
Cracking Video Peter - will have a go in making one, and looking forward to your next video. thanks again.
Have fun
Another great video, Peter! Thanks!
My pleasure!
Wonderful discussion Peter. I'm looking forward to the next episode, and the information about takeoff angles. I believe we as hams spend too much emphasis on SWR and not enough about actual radiator efficiency and focusing (or nulling) where we point the RF. 73 OM
Thanks for sharing.
Good ideas. Thanks Peter.👍
No problem 👍
Thank you for another thought provoking video, of course a 10m loop is often quite practical in a loft space. You have reminded me too of the "Lazy H" though of course that is not a loop. Antenna modelling software is a very useful tool, but of course does not take account of fences, sheds, foliage and houses in the surrounding area. 73
Absolutely right about antenna modelling and yes, loft space is a good option. 73 Peter
Hi Peter
I once built a 1.5 wave delta loop. It had a top horizontal length with a break in the centra and the bottom of the triangle was near ground and fed here with a home made 1:1 Balun. Despite looking through a railway embankment 30ft away and then power lines beyond, it worked very well to Haiti but strangely, also Northern uk under unusual short skip on 10 Metre. This was in the 1970s.
73 Dave G4BTI.
Thanks for sharing. 73 Peter
I use the 6 X 12 loop 10 and am very happy with it. My question is how would things change IF you put a 6 meter loop inside of the 10 meter loop? Would this change anything on the 10 meter side or would the 10 meter side change anything on the 6 meter side? I use 1/2 inch pvc for the top and bottom spreaders and let the vertical wire act as supports between the top and bottom. If you used a X fitting in the middle of the top and bottom you could then build the bottom 6 meter spreader and a top spreader inside of the 10 meter loop. Feeding both antennas from the bottom middle. Two antennas taking up the same space looks to me like.
Many hams use multi-band quads with several loops one inside the other. So should be no problem.
Hi Peter, just a quick note to say how much I enjoy your videos. I've not been licensed long and your content has been invaluable. I wonder if you get a moment to do a video on radiation angles. Its a bit of a confusing subject, no doubt one you should shed some light on! Keep up the great work! 73 M7PGX.
My next video covers that. 73 Peter
I have a small Delta Loop, works great too on x2 flagpoles up 10ft, works as a small square or a triangle, both fed from the bottom, centre for triangle & corner of the square
Great.
I enjoy 10m and have been playing with loops, and so enjoyed YOUR video. The vertically polarized rectangle is one that will fit many loft spaces if you don't have a garden. I have my own take on a vertically polarized loop in my loft which has been working well form me, the plan is on my QRZ page if anyone wants to try it. Looking forward to your next videos. 2E0LMI
full size closed Loops are one of the best antennas one can own, if you got QRM around you than be prepared to be pleasantly surprised, Those antennas do not need to be very high, cheap to make and could be erected horizontally in some strange shapes to suit even the smallest garden and yes, it could be used as a multi band with the aid of a good tuner, there is a lot of give when putting one of those up.
Many who have antenna restrictions hide those very well and are very active on DX regardless.
Give it a go, don't worry too much about SWR, let the antenna tuner take care of it.
Many thanks. 73 Peter
Hi Peter, Really enjoy your videos. I wanted to look at the extra material on loops, but the link takes me to a Microsoft log in. I was hoping you might discuss loops in the horizontal dimension. Thanks again. 73
Sorry about that. I will check it out and correct. 73 Peter.
Excellent ideas Peter. I'm a loop fan. I have a nested delta loop for 20/17/15/10M with a common feed and 2:1 transformer/balun. I find they are also quieter than dipoles. 73...W6QR
Hi, nice to hear from you. 73 Peter
Nested delta loop sounds interesting. Curious about the construction. Especially how you supported the loops inside each other.
@@Steve-GM0HUU the loops are hung on a rope, each apex is at a different height. The loop centers are all at 11M. The corners are pulled out using ropes. The feed points are connected like a quad
@@wshanney Thanks for the info.
thanks Peter really interesting video curious to know what formula your using as i would like to scale for 15m or 20m thanks
There is a link below the Video.
Thanks i missed the link will have a look
Opinions encouraged. I want to try a horizontally polarized circular loop made from 1/4"> copper tubing, suspended by a plastic swivel on an overhead rope. Feed with a 75-ohm coax matching stub to a 50-ohm line. My thinking is if I need to shorten the length. I will need only to trim one end and make that end the shield side. Also a diamond 1/2" EMT configuration.🤔 73
Go for it!
Good video, thanks! {I have a 40m full sized, HORIZONTAL delta loop} 73 de WA4ELW in TN 🇺🇸😃
Nice to hear from you.
Really appreciate this video. I've been considering a square loop for a while, but a rectangle would be easier. I will probably try both vertical and horizontal. Could I make the vertical rectangle vertically polarized, would there be any disadvantage to that?
According to EZNEC that would give you a 200 Ohm impedance and only 1 dBi gain and a very low radiation pattern. I'd say no.
In EZNEC a distance from the ground of 1/2 wavelength seems to be better for the vertical rectangle. The FF plot even shows 8 dBi at 25 degrees. Doubt the 8 though ..
The loop ( quad ) and it's variants are underrated: easy to build, cheap materials, surprising gain and some directivity. At higher (UHF) frequencies they are so easy to bend from just some electral wire.
It should work fine. The measurements may need rweaking as the high voltage point would be nearer the ground.
@@watersstanton perhaps I'll just stick with your measurements for a horizontally polarized, vertical rectangle.
I'm thinking 1/2" pvc pipe for the frame, and then hopefully I can hoist it up into a tree
➰ 🏹🌳
@@watersstanton I believe redeye wanted to move the feedpoint of the vertical rectangle to the vertical ( long ) side to make the antenna vertically polarized. That not only changes the impedance but also the radiation pattern.
Your rigexpert link is not working
I did NOT realize a rectangle provides a better match to 50 ohm, nor was I aware of the 2:1😲 😃🇺🇸
Glad it helped.
C00L , me too .
T/C/E
Slot Antenna
Thank U Peter for such unusual arrangement Antenna , which i call it Government Antenna's as Philosophy of Ranking .
Hopefully you introduce us to HenTenna in next episode ..
is true that HenTenna has 3 dBd (Not 3 dBi) ?
What about extended double HenTenna and Folded HenTenna ?
moxon