Loop on the Ground Antenna - Part 1 of 4

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The build and test of a loop on the ground antenna for low-noise receiving on the lower amateur bands. This is a design by KK5JY and the full technical details can be found at KK5JY.NET
The idea behind the design is to have a low noise receive antenna when working what can be very noisy low frequency amateur bands. Transmitting on the main antenna while receiving on the ground loop.
This is my build and test of this design. See how I get on...
The Fair-Rite binocular ferrite core can be sourced at Mouser (No. 623-2873000202). Also at Qubits in the UK (radio-store.co.uk/). Beware p&p costs!
Ferrite Toroid 73 Multi-Aperture Z=1250 Ohms @ 10MHz.
Parts 2, 3 & 4 of this series, where more tests are undertaken and better results found, can be seen at:
• Loop on the Ground Ant...
• Loop on the Ground Ant...
• Loop On The Ground - P...
This is just one of many amateur radio videos on this channel. Please feel free to browse, like 👍🏻 and subscribe 🔔
Thanks.
Ian.

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Опубликовано:

18 июн 2024

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Комментарии : 76

@GateKommand Год назад

I found it quite therapeutic watching you wind those turns!

@ianxfs Год назад

Funny.

@johnratcliffe6438 4 года назад

We were discussing beverage antennas last night at our club meeting; great timing Ian and thanks for the upload! 73s, John

@ianxfs 4 года назад

John Ratcliffe Thanks John! I’m going to tinker to see what I can achieve with this or something based on it....watch this space...

@robg3545 3 года назад

Excellent instructional video Ian.

@ianxfs 3 года назад

Rob G Thanks Rob! There’s a few more in this series too 👍🏻

@oldsal8648 2 года назад

Thank you for this very informative video. Will be constructing one soon. Very 73 de N9NY

@ianxfs 2 года назад

Great and thanks!

@xentxent3400 3 месяца назад

Exelence tutorial. Big thnx, friend.

@ianxfs 3 месяца назад

Thanks.

@M0SZT 4 года назад

Thank you Ian, really well presented video and thanks to G1WHP for starting the exploration. In theory would a bigger loop increase the receive?

@ianxfs 4 года назад

2E0EZT amateur radio Thanks Carl. Yes, possibly? I’ll experiment and see where I get to with this...Ian.

@murilorodrigues776 Год назад

Thank-you for video, very didactic and explanatory, congrats! PY2DS

@ianxfs Год назад

Thanks Murilo!

@TheGmr140 3 года назад

good stuff, i made a 6ft x 6ft loop connected to a 9:1 balun, then direct into my HF+ Discovery SDR by airspy, works well, any pros and cons of having a large loop area? also wondering if two loops, one on the ground, and one vertical, and a switch to see how the snr changes between the two V and H loops. 73s

@ianxfs 3 года назад

Thanks. The larger loop picks up more noise, so there’s a trade-off in size at some point. I’m not sure a vertical would work very well as effectively you’re into normal loop antenna territory there? What about two on the ground fed at different corners or the same one with some sort of switching setup to achieve the same? Different directivity then. Have fun experimenting 👍🏻

@G1WHP 4 года назад

Just a point I’m using satellite cable 75ohm but it’s low loss with good shielding. And best of all it’s cheep. I am going to run another loop at 3ft off the ground around the whole garden to see how that works. This may be called a beverage antenna or something similar, I have seen so many I loose track. It keeps me occupied anyway Paul

@ianxfs 4 года назад

G1WHP Yes Paul. I will try raising and lengthening too. I read what seemed a knowledgeable article that said don’t bother with beverage unless you can put up hundreds of feet of wire. Will dig it out...

@MikeM0XMX 6 месяцев назад

Hi Ian. Callum suggested I research LOG antenna as I have same problem as you. Is there a follow up have this? Did you succeed? Great vid by the way just wasn't the positive outcome I was hoping for. 73

@ianxfs 6 месяцев назад

Yes Mike. Four-parter video series. I still use this on 40/80/160 as original build and no external pre-amp. All good. Use in second VFO and lower noise to signal ratio in many cases 👍🏻

@M0JHN Год назад

Parts are on their way for this project, thanks for sharing Ian. Any updates in 2023 for this? Still working? Any improvements?

@ianxfs Год назад

Great Morgan. Still working, still using. It’s on my second VFO (& RX only input socket) for 80 & 160m 👍🏻Have fun 😀

@Steve-GM0HUU 2 года назад

Interesting and thanks for sharing. Obviously disappointing. If you have a manual ATU you could try that to see if makes any improvement. In terms of QRM-busting, I was thinking about building an RX antenna for HF. Had been considering a ground loop like this or possible an active receiving loop.

@ianxfs 2 года назад

Hi Steve and thanks! Watch the series through as it’s a lot better by part 4 👍🏻😀

@ytr734 2 года назад

hello, complimengi.you can tell me what thickness is the wire and how many turns you make in the ferrite thanks I always follow you

@ianxfs 2 года назад

Hi, see duplicate comment/answer.

@oldsal8648 2 года назад

Hi. What is the box made of? Assume PVC / plastic? Thanks de N9NY

@ianxfs 2 года назад

Hi. Yes.

@G1WHP 4 года назад

Hi Ian. I am going to try a low noise amplifier. About £4-5 of eBay to see how it improves performance. I will power it from a pp3 9v battery. I will let you know how it goes. Paul

@superconductorchip9072 4 года назад

You will need a BPF, you will hear the whole of the HF Bands including lots of Noise.

@ianxfs 4 года назад

Thanks Paul! I’ll experiment this end too...

@G1WHP 4 года назад

@Superconductor Chip Yes a wide band amp will amplify the whole bandwidth but I still think EMI noise will be reduced as the loop is not picking it up in the first place. I have also read that a good ground to the coax braid at the feed point helps. My lawn is turning to mud at the moment as it’s so wet I need to keep off it until it either freezes or drys out a little. 👍 Paul Anyone who has any experience with this type of antenna please comment

@ianxfs 4 года назад

G1WHP Just had a search. Yes loads to choose from by the looks of it...😀

@13HN870 7 месяцев назад

Hello, so 2 turns on one side and 4 turns on the other side of the ferrite?

@ianxfs 7 месяцев назад

2 & 6 as described from 08:09 onwards…

@richardtwyning 5 месяцев назад

I've got some telephone type wire. Will that be OK for the transformer wire?

@ianxfs 5 месяцев назад

Should be fine Richard and small enough to get the required turns 👍🏻

@richardtwyning 5 месяцев назад

@@ianxfs thank you 👍🏻

@robertchortek1944 3 года назад

Great instructional video! Loop does NOT seem to improve the S/N ratio AT ALL!

@ianxfs 3 года назад

Keep going Robert! There’s three more videos in this series. I now use this original version all the time. Got used to working worth it and it’s my second VFO on 80m, 160m and sometimes 40 👍🏻

@techiefan1986 3 года назад

I may be stating the obvious, but you are just makring a RF transofrmer to match the antenna's impedance to the feedline, no?

@ianxfs 3 года назад

Techie Fan Yes. A loop needs around a 6:1 transformer (50 Ohm feed) and in this case a very small one as it’s not for transmitting.

@IZ0MTW 3 месяца назад

@@ianxfsHi Yan, but this transformer is 9:1 ratio, not 4:1, right? 6 turns divided by 2 then squared. 6/2^2=9. Anyway I don’t think it makes much of a difference.

@ianxfs 3 месяца назад

@@IZ0MTW Yes, correct 👍🏻

@yaesuicomkenwood 4 года назад

well, I see, that you hear on the loop almost nothing :-(

@ianxfs 4 года назад

Martin, watch parts 2 & 3 👍🏻

@Andy2e0ree 4 года назад

I just use a 4=1 and 66 feet of wire in a loop

@ianxfs 4 года назад

Andy Cowley How do you get on with yours Andy?

@Andy2e0ree 4 года назад

I got it 2 feet of the ground and it drop my noise from 10over to lose them 2 so I think it’s great 73

@ianxfs 4 года назад

Sounds good! Do you earth it at the feed point or just connect to the feeder?

@Andy2e0ree 4 года назад

ianxfs no I just connected the feeder 73

@superconductorchip9072 4 года назад

Try a dummy load !! you may get better results.

@ianxfs 4 года назад

Superconductor Chip Yes it felt like that! I will keep trying....

@Sadiq254 3 года назад

@@ianxfs I found mine to work well on 40m more than any other band. Will try a 400ft version of it in a few days. 73 - A92HK - Fabien.

@ianxfs 3 года назад

@@Sadiq254 Good luck Fabien! There’s three more videos in this LoG series if you haven’t seen them already 👍🏻

@rivit90 10 месяцев назад

great video , i think you may have counted the loops around the core wrong , heres a link to a youtube video of a chap buliding the transformer , he counts his loops differently , Either he or you are wrong ,, just ordered a core to have a go myself ,,,, other vid ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-wMb8i5QajW0.html

@ianxfs 10 месяцев назад

Hi and thanks for the comment. I’ve used standard binocular core winding as you’d find on circuit boards. If you Google binocular core winding and focus on the electrical/electronics side of this you’ll see the standard approach. Good luck with your build 👍🏻😀

@luckydubeinrc5165 2 года назад

signal to noise ratio is not any better, they work marginally...not worth it

@ianxfs 2 года назад

Hi! There’s four videos in this series. I kept on with this setup and find it really useful. I use it as a second receive on 80m mainly, but also 160 & 40m bands. 👍🏻