Building and testing the Loop On Ground LOG Antenna

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In this episode, I construct a Loop On Ground (LOG) antenna and evaluate its performance against my terminated folded dipole.
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SDRPlay RSP1A Software Defined Radio
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Pre-made Loop On Ground HF Receive Antenna
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Bi-Core BN-73-302 for balun
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The LOG antenna is simple to build, consisting of a 60-foot wire loop and a 6.25:1 balun. I built the balun by wrapping a binocular core with two turns on one side and five turns on the other to match the loop to 75-ohm coax. For 50-ohm coax, you can increase to six turns for a proper match. I used 16-gauge wire to construct the loop, forming a 15-foot per side square on the ground, held in shape with wooden stakes.
For testing, I used an SDRplay RSP1a software-defined radio and a DIY antenna switch to compare the LOG to a T2FD folded dipole. Despite both being terminated antennas, the LOG, placed outside, showed less RFI compared to the attic-mounted dipole. Surprisingly, the LOG performed well above 80 meters, sometimes outperforming the dipole due to its outdoor placement.
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#hamradio #amateurradio #shortwaveradio

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Опубликовано:

19 июн 2024

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Комментарии : 31

@davegasque8392 Год назад

Been running a 25x25 square for a month now, with a Cross Country Wireless Loop kit. Most impressed with the low noise, yet great signal capture. A hidden gem of a design.

@BrokenSignal Год назад

It really is an impressive antenna that many think won't work.

@zsradioham 2 года назад

This LOG works superb. I have written an article in our club newsletter. It makes a huge difference for reception. Some days the noise is 7 - 9DB and switching to the LOG it goes down to 3 -5DB. Surprisingly one can find some conversation which is not audible on the other antennas. WORKS!

@BrokenSignal 2 года назад

I have noticed similar results. Sometimes switching to the log makes the difference in the signal being audible.

@fly1327 6 месяцев назад

A ham from long ago, starting to listen again with an HF "dongle" (imagine that) to my computer. 40 meters my favorite. 60' loop in the grass with a simple impedance transformer works? Hell, living in my HOA home, I'm going to give it a go. Thanks!

@BrokenSignal 6 месяцев назад

I think you'll be surprised how well it works! Let me know what you think.

@graphicventures 2 дня назад

Significant lowering on the noise floor with the LOG

@BrokenSignal День назад

That's it's best attribute!

@tlebryk 2 года назад

Easy to setup for field trips. I have used 100 foot down to 40 foot circumference with 9:1 balun and all work well except that as it gets smaller, could use a preamp boost. I currently use a 29 foot 3-conductor wired like a folded dipole and connected to a Welbrook Medium aperture amplifier in place of the balun (the Welbrook amp has a 4:1 balun builtin). Thanks for the demo comparisons.

@BrokenSignal 2 года назад

It is one of the easiest to setup that's for sure.

@yaroslavartyukh964 2 года назад

Mine, with yard staples completely invisible under the grass. And yes, from 1,5 Mhz to 10 Mhz outperforms Cuschcraft R9 vertical from 5 to 10 db in SNR terms. Below 1 Mhz it take some noise from unknown neighbor sources. Compared with W6LVP magnetic loop, the LoG is a bit lose couple db's.

@BrokenSignal 2 года назад

It definitely is for the top bands. As you said above 10 Mhz it doesn't work to well.

@davegasque8392 Год назад

A week ago, with my 25x25- had a fabulous couple of nights catching AUS hams on 20M ~ 0700z in the MidWest. They were everywhere. Like another poster said: WORKS!

@GG-vx7gi 2 года назад

Good info. Just got a rsp1a and looking for antenna ideas. I have an 132 ' endfed with a 9:1 balun to try with hf and maybe add a discone. No HOA but still want to stay low profile. Just like the gutter antenna, I wouldn't have expected the ground loop to do as good vs the dipole as it did

@BrokenSignal 2 года назад

If you have 132' of wire in the air you'll do quite well. I would recommend the T2FD Antenna. It's a great all around receiving antenna and since it's terminated will complement the end-feed well when it's noisy.

@anthonyfranz8317 5 месяцев назад

I want to try this soon.

@BrokenSignal 3 месяца назад

It's a fun easy project with surprising results. Let me know how it goes for you!

@hamradio1017 2 года назад

I have all of the parts to make one, I just need to assemble it. I hope to get it up yet this fall and bury it a couple inches in the ground for easy mowing and snow removal

@BrokenSignal 2 года назад

It is fast to construct and deploy. Should be able to accomplish it in a few hours. Let me know how it works for you.

@PatAutrey 2 года назад

I’m trying to figure out how to put a receive antenna connector on my 991a - Any ideas how this is done

@55Ramius 2 года назад

Can this setup be buried a few inches to not have to move for mowing?

@BrokenSignal 2 года назад

You can place it closer to the ground and you yard staples to hold it low enough. I have heard of placing it a couple inches below ground and plan to try that method myself.

@hamradio1017 2 года назад

@@BrokenSignal My understanding is yes, you can.

@oasntet Год назад

5:2 binocular isn't a 9:1 balun, is it? More like a 6.25:1. I guess if you were matching to 50 ohms, you'd use 6:2 turns instead, and that'd be a 9:1 balun.