Magnetic loop Helically Loaded Magnetic Loop Antenna
HTML-код
- Опубликовано: 19 сен 2024
- This magnetic loop antenna is about 50% smaller in diameter then a text book magnetic loop. The performance is outstanding, it compares or is better then a 1/2 wave dipole mounted 1/2 wave above ground. It is also directional, when turned with a rotor it quite often changes around 10 to 12 db from the plane of the loop to broadside.
Amateur Radio Antennas.
HOA Antennas
Antenna Restrictions.
It was great pleasure for me to watch this video Rochard...Greetings from Poland, the country where your roots come from I think.
Witek, SP5TAA
Wow! This is the loop to build, impressive. Thank you for sharing this design,
You can use a air variable with reduced performance. If you live in an area with allot of moisture you will have more issues with a air cap. Nothing beats a Vacuum capacitor in his application, it is the heart of the great performance.
That is very nice. Wish I could find someone to build me one;both actually.
I have an AlexLoop Walkham I use with my little FT-817ND and it works great.
Great job !!!
I am working on a mag loop to deal with operating in an apartment, your design is very interestinf
Thanks, I have many requests to build these antennas. Way too time consuming for me, the cost for me to build them one by one would be cost prohibitive to the interested party. Parts are also in demand and not very available. The vacuum cap is the biggest issue, too expensive new.
Good luck but don't be too disappointed with the effectiveness of the air cap.
I have already been down that road.
very nice .im no ham but i build sw receivers and i have magnetic regen i love. great idea.great vid
To OutwestDx
The point is not that I need 1 KW of power, it is that the antenna can handle 1.5KW. That is why there is the FCC power limit. If one wants to use the power they can; especially in the case of poor band conditions. How do YOU know that I always run high power, are you the power God? I actually had a contact today from here (central AZ) to Vancouver BC, I was running 100 mW, yes 1/10th of a watt and received a 5/2 report with Q5 copy on his end. I don't have to prove anything.
@oh1sdr
Actually the loop is the same or better 95% of the time, probably due to the fact that I can rotate the loop for best direction. Once in a while the 390 ft dipole is just a few db better due to the gain lobes in certain directions.
I have checked and compared this now several hundred times with the same results.
Excellent...
Hi Rich, I was listening to you on 17 meters today, great signal here in Seekonk, MA, you were talking to Jack KL7GKY in Oregon. You were talking about your neat antennas, so I check QRZ, and found all this kool stuff on them. I would love to build one (or two), as I don't have a big lot to work with. How expensive are the parts? Gary -N1ICX, Thanks for posting this video.
The purpose is simple mathematics, if I get an S9 +10 for a report; the same station will still hear me at 1 watt or less. If a station has a low noise floor he will hear you with 100 Mw, I do it all the time.
If you look at my QRZ page you will see that I have a design using an inductive coupling method. It is actually better balanced but doesn't work any better then the gamma match.
do the test of putting it horizontal, in a horizontal plane, to see if it is omni directional
I've seen where a stepper motor was used nd it created interference that is picked up by the antenna and radio
Would a flux charged antenna core change radiation strenght???
Would an inductive loop work for feeding RF rather than the gamma match technique?
it is hl magnetic loop antennas .com not jsut hl magnetic loops .
Your probably looking at $450 for the small one 20/10 and around $550 for the 80/20.
For your first try you will probably have 40 hours of work in each of them if you have skills.
Rich,
Hate to be the one to burst your bubble but, your antenna design (basically it's a DDRR with the ground-plane displaced 180 degrees or Earth-ground tuned depending) isn't anything new. I've built one or two (more like a half-dozen or so). I came across the design in the ARRL big book of antennas. My last design was a helical adaptation much like yours ,however, I designed my antennas for use in the 10 & 11 meter bands.
It's too bad that the frequency range is limited with the DDRR designs. I was looking for information to see if I could build a DDRR-type antenna for use in the 2.4-5.5GHz range of operation.
FYI - You should really proofread what you write before posting it. There are several glaring spelling errors on your QRZ.com page. The inability to spell makes everything you do, no matter how ingenious it may be, look like it was done by a hick that got lucky and not by someone that has invested years into the design.
Just putting it out there to make you think...
Catch you in the DX!
To DrGoodwrench64,
I hate to burst your bubble but you cannot show me anywhere whhere there was a previous design using flat copper strap to increase RF skin surface while making the DDRR 40 % smaller in diameter. If you can find something published before my posting i would like to see it, I researched all patents on the entire net. What makes my design different then the DDRR is the helical winding to make the antenna compact so that it can be implemented in a small area.
As far as your unnecessary comments on spelling,most engineers can't spell, as long as you obviously understood all of it, what does it really matter anyway?
Did you know that an intelligent person can read a paragraph flawlessly even if most of the letters in all the words are transposed? Only a certain percentage can do this, maybe you can't? That is probably why I don't see my own errors and really don't give a sh_ T! Have fun.................
LMAO! While you two are working out your grammar and spelling, I got a comment. If you build DDRRs in 40, 20, and 10 you can mount all 3 in an old sattellite dish. Now if you add asmuth and elivation motors you can shoot signal like a rifle :) (An old Raydex works best with a 4 to 1 F to D) Keep it down to QRP and you can use 50 cent high voltage caps to load the DDRRs. What do you need with more than 1.5 watts anyway? First, master the power of the AA battery :) AE4YW
DrGoodwrench64 Wise man once said... "I don't know of any thing in my book to be criticised on by honourable men. Is it on my spelling? - that's not my trade. Is it on my grammar ? - I hadn't time to learn it, and make no pretensions to it. Is it on the order and arrangement of my book ? - I never wrote one before, and never read very many; and, of course, know mighty little about that. Will it be on the authorship of the book? - this I claim, and I hang on to it, like a wax plaster. "
can you please send me the web adress i cant get it sorry fore that nice work lovly antennas need one to 27.555
QRZ.com
Search for K8NDS