IT WORKS! INVERTED L EFHW WITH 49:1 AUTO-TRANSFORMER
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- เผยแพร่เมื่อ 5 ก.ย. 2024
- If you saw my last antenna update video then you'll be pleased to know that I freed the caught wire and finally have my EFHW installed how I wanted. And boy oh boy, it works, it works WELL!
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That was a surprise Matt hearing myself lol, I,m glad you up and running at your new qth, I have a UK antennas 49:1 nice bit of kit but using a 9:1 by Balun designs with 84ft of wire for now, hope to catch on 40m real soon.
FB, Matt, on the inverted EFHW. Sounds like a winner. Going back to your questions about the fence behind your shack, I think it would be fun to experiment both ways: 1) connect it as a ground to see if it gives you any advantage; 2) connect it as a low elevation NVIS antenna to see what you get! Thanks for your videos. I find them very informative and well done. 73, AE6SS
I shouldve warned you Matt.. I had same problem I was in amongst hedges and trees like tarzan after getting tangled..
I yanked the main element from a branch and stretched the wire and 80m element snapping the connector at the coil... Got a little frustrated. Lol.
I will have to order another as its way off on 80M.. I have a really small back garden so I'm really limited.
Yes get your ground onto the fence matt I have a fence that goes all the way around a reservoir and up over a cliff and its a perfect ground.
What a difference since your last configuration. Loved that Ateam Sstv tone.. Well in mate thanks for sharing
I own acreage in western Minnesota. The state installed an insulated electric fence so they could rent public property everybody owns to run livestock on. Before they rented it I attached my IC-705 and a manual tuner to the insulated wire and the ground or counterpoise to one of the uninsulated wires. I knew there was a net on so I called and reached western Oregon. Reception was wonderful. Light it up!
I’ve built a dozen EFHW antennas using mostly a 49:1 wind for the balun. By using a sweeping analyzer connected directly to the feed point but collecting data via Bluetooth (Rig Expert Stick Pro), I’ve been able to tune them to the fundamental band and those upward harmonics very, very well. Glad you’re on the HF bands from your new QTH! 73 de K4FMH
I would use one of the wires of the fence for a RX only beverage antenna! Add an inverted L for 160 + 80m and you're in business with the big guns on the low bands. Winter is coming so perfect timing! It seems you have a pretty low(er) noise level compared to your old QTH. Do you know by how much? Enjoy the new QTH and it's possiblities! Thanks for the update
Excellent stuff there Matt! It was great to work you on 40m on Friday too. 73!
Cheers matey! Good to get you in the log!
@@TechMindsOfficial we should ought to try on a few other bands too!
Welcome to EFHW Club, I have a 9.1 Moonraker EFHW 67ft wire then drops down the drain pipe works great 👍 great video :)
Use the fence as a counterpoise for you new inverted L.
...that fence, it's essentially a ground or will be at earth ground... those look like metal stakes or fence posts... I don't think you would have good results loading it up. But.... I wouldn't think twice about burying some #10 wire and clippint it to the fence if you feel the need. A good earth ground eliminates static buildup and RX noise...Try taking out that 1:1 balun.. there is loss in those things, and you don't need loss... if your coax is buried into the earth, I doubt you really need it.. whether you like it or not your coax shield becomes the counterpoise..there is nothing wrong with that. The inverted L introduces a vertically polarized component into the radiation pattern, and tends to fill in the nulls that exist on a horizontal only antenna. Wow beautiful QTH Matt...
You can certainly have some fun experimenting with that fence. I couldn't tell from the vegetation if it was properly insulated from the posts nor if there were any metal posts between the wooden ones.
Where I grew up in wheat and cattle land in northwestern Oklahoma there are many, many miles of "hot fence", but most of them will be buzzing at one time or another. Kinda glad I'm not out there any more just for the possible QRM ;)
Personally, Matt, I would walk around the fence tracking where it goes wherever it goes, and if there were any breaks, I would find a way to link them. I would then check its resonance with the VNA if it was no good, then I would use it as a ground.
Matt, could you do a video on SSTV reception? Be interesting to hear what you do with that fence, but you may have to ask the landowner’s permission, and make sure he doesn’t electrify it whilst connected to your shack! 73 Simon, M7WWX
Great to see you getting good reception at your new place, as for the wire fencing... go on... load it up! :)
Glad you got it up Matt, very important.
I have built 5 EFHW antennas now of differing types. They all work well. Attaching an earth/counterpoise made very little , if any, improvement. None of my wire antennas, EFHW, OCFD, G5RV, Half Wave dipoles, Inv Vees etc, worked as well as my 80m horizontal full wave loop antenna. None. In 40 years the sky loop at 30 feet rules. Only the triband yagi is better on 10, 15 and 20. I live on a farm with wire fencing. It only takes a few rusty or corroded joins in the wire and you have an RF generating diode causing substantial problems. In my experience forget attaching the neighbours old fence to your earthing system. It gave me grief. It might be OK on new correctly installed electric fence but that would soon be energised by the farmer anyway. Cheers VK5LB
Matt, Nice house, Nice views, Good take off but please leave that fence alone ☺
A wire with alligator clips from ground bar to fence to see if adding the fence as a counterpoise will add better reception or TX. I did that to mine and it is working fine in reception side.
Nice to hear normal sound in the beginning of the video. The indoor sound always gives me the shivers :-) Mike is way too much "crispy" I think.
About the fence: are you sure it will never be at high voltage? I would never take the risk to blow up my equipment, unles it's my own fence.
Living on a Croft I have 13 acre fence, about 5km in length I tried connecting wires as a rx and as a ground , both performed very poor .
Mind you I was using a 240 feet doublet. Your EFHW works great . That fence will need to be scrapped off the galvanised, that would compromise the fence . Is it your fence ?
Drop a 200m wire straight to the field, and make Beverage On The Ground. Or, dig a coax 20-30m from the fence and make Loop On The Ground.
Best RX antenna, you can have
Amazing setup. Most of us can only dream about something like this, 73
I would maybe use it as a counterpoise or ground, but not antenna. Probably has some weeds and grass up on it. Some of the electric fences around here are set up to be weed burners, that will burn off the grass that gets to the fence... but, as dry as it has been here I don't know that it is ran that way lately.
Is it insulated from ground? Post the antenna analyser results before trying to load it.
Try the fence as a counterpoise would be my suggestion.
Looking great! Very neat as well as effective 👏👏👏
Does the fence loop all the way round ? if so, maybe a LOG antenna ?
Hi I think you need to check if that fence is live first Matt best of luck.Gary
Countetpoise!!! It will not load well. Use it as the Mat-40 tuner ground/counterpoint. Mine worked superbly.
Do it!!!! Or use the Barbed wire as a receive beverage antenna. It’s low enough.
Use it as a ground, using it as an antenna could be asking for trouble from interference
Looks and sounds Fantastic!
You will have to scrape off the galvanised coating off the fence to make your connection
I’ve run a 35 foot vertical wire as an end fed half wave on 20
meters with a 49:1 impedance matching transformer with good results in terms of good matching (about 1.2:1 SWR and performance, based on reverse beacon network SNRs, casual QSOs, and contesting on both CW and SSB. It will also match well as an end fed full wave on 10 meters, but radiated performance is markedly inferior to a simple quarter wave 10 meter vertical with a counterpoise or a simple horizontal doublet or dipole. Suspect that at a full wave vertical there is degraded low angle radiation and enhanced high angle lobbing going on. Can also make a 35 foot up 35 foot over 80 meter inverted L over 18 elevated radials run as a 40 meter end fed half wave inverted L with the 49:1 transformer and also 11:24 as a 20 meter full wave inverted L and a 10 meter 2 wavelength inverted L. All have relatively low SWR but performance is not a good as a simple quarter wave vertical band for band, based on comparison of RBN SNR comparisons on multiple occasions. The 80 meter 1/4 wave inverted L is about 10 sB better to Europe than my 45 foot elevated dipole however.
Chris AJ1G Stonington CT
Load it up as a Receive Ant.
Hi Mate check the wire fence isn't broken at any joints farmers are notorious for being a bit lazy if the field does not contain animals as you mentioned it only has crops.. WIRE IT!!!! go on take a chance!
Fun video. Thanks.
Glad you enjoyed it!
Interesting to see what you do with that fence. I have a similar fence around me. As yours is a public foot path maybe loading it up wouldnt be good, eg RF burns?
Be careful about using a long fence as a radial or antenna if you have lightning. They are prone to attract it and can lead to all kinds of damage to your gear.
I would try both loading the fence and using it as an earth!
Or may be the time for 60-70 ft self supporting tower with Optibeam yagi on it )
Load it up… receive antenna.
Looks good on receive. How about on transmit?
Matt, I have heard a lot of stories about these 49:1’s. Which has kind of put me off. Maybe you can give me some advice as I have bought one, so I can try for myself. One thing I’m not sure about, i’ve been told the coax, must be a specific length when used with the 49:1 as I understand these use the coax as part of the matching. can you tell me as to the specific lengths of coax & wire for top band? Or a formula used depending on what size required. Thanks 🙏
Tune up the fence and give it a go :)
I would be inclined to keep the line isolator and UnUn well off the ground (Nail to tree?). A square loop or half square around the fence might be an interesting idea.
Also that exterior wood (fence/decking) in the garden needs wood preserver. G7VFY
Did you ever load it up?
we can so get a 40m long wire in there matt :)
Try the fence as a ground. It is too close to the public to be an emitter.
If I lived there... I would fous on VHF/UHF, wide open clear takeoff's
Depending on the age/construction and wire jointing, the fence could be problematic... noisy...
Beverage receive antenna
Any suggestions for a receive antenna for HF connected to an RSP DX. Have a garden that is 123 feet long and need ideas. Thanks.
@TechMinds , followed your channel since you first started .
Just wondering Matt . What length from the tip of fibreglass mast to end of Henri coil?
Reason I ask is my garden is almost identical to yours and I also have a big metal fence that runs for miles .
Let me know m8 .
73
Hi ya, and thanks for following my channel for so long! Ummm.. Do you mean the tip of the tri-band vertical antenna to the 110uH coil on my EFHW antenna? If so, probably 3 to 4 meters I think.
@@TechMindsOfficial Yes Sorry Matt , the EFHW antenna, the distance where it leaves the spider beam pole to where its attached to the pole on your building.
4 metres sounds about right. Thanks I'm going to go for it as my primary antenna .
Thanks for the video it has persuaded me to install something similar. Please could you tell me what radio and software you are using?
Thanks
Mike 2E0UMF
Was you wire about 41.5m long?
Great video Matt and congratulations on the excellent performance success! Quite inspiring. 👍📻⚡️Cheers! Tom - WA7FLY
Rec Antenna !
Can you have the box closer to the house
I guess so. I had thought about putting the box on my chimney but my garden isn't long enough to have 40m or wire horizontal.
There is one way to find out if its electrified... get electroboom to come by and touch it.
load it up and use as a NVIS antenna?
What to do with the metal fence? Do what amateurs do. Experiment!
"Cows and things" ... Also known as livestock!
The fence is someone else's property. Do what you like with it, just don't tell anyone. Oh, wait...
fence too low for antenna. good for ground.
🎧KG7JM🎧 😳🤯💥🎯
Rx antenna - beverege…
73 la5tta
Public footpath and the fence isn't yours so doing anything with it is a bad idea.
I knew you could do it Matt, where's there is a will there is a way. M7RLL
Absolutely! Cheers!