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Re: air core loop antenna balun
M6MRP-Phil, Well having the bookmark indeed saved, when clicking on it though, it brings up the current eBay page, which is not including the diagram. I am also going to check in my documents files, which would indeed have the diagram, as the document file was not his actual previous eBay page... I will continue to search my document files, possibly I may have cut and pasted the balun design, but many files to search and not sure of what title I would have assigned the file...so maybe just maybe it may be in there, I would let you know if so! Also researching the eBay global program, it has grown greatly...here are all the countries eBay will ship, at less than direct postal methods, and includes complete tracking! Australia Austria Belgium Bulgaria Canada China Cyprus Czech Republic Denmark Estonia Finland France Germany Greece Hong Kong Hungary Indonesia Ireland Israel Italy Japan Latvia Lithuania Malta Mexico Netherlands New Zealand Philippines Poland Portugal Romania Russia Singapore South Africa South Korea Spain Sweden Slovakia Slovenia Taiwan Thailand United Kingdom Good luck...PS: Balun designs also offers similar loop balun of interest, yet also not inexpensive. Continued luck Phil, old boy. -73- Ross? -KB8NTY- |
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Re: air core loop antenna balun
phil blast
Thanks Ross, if you still have the details saved that would be a great help, he has nothing on Ebay at the moment I have already checked, I have pondered over this for a while now about using a 4:1 balun which is meant for 200 ohms down to 50 on a loop that is from 125 to 130 ohms or around there depending on how its deployed, it leaves the match way below the required 50 ohms, even a 3:1 would be better but could not find any details on building them? I am in the middle of moving qth at the moment but once settled I intend to try a few experimental windings and see if I can get close myself, about the global shipping on Ebay last year I was looking to purchase a build yourself switchable low pass filter board with all the components from over the pond and the seller told me the USA
was not yet signed up for it so shipping was still expensive? if they have now it will make things a whole lot easier as there is so much over there which we do not have in the UK radio wise and I am desperate for a new battery for my Yaesu FT51r handy which is not available in the UK (the battery) but abundant in the US even in the newer chemical formats but they will not be allowed to be shipped as they are liquid gel. regards Phil M6MRP On Wednesday, 19 February 2014, 4:55, "kb8nty@..." wrote:
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M6MRP-Phil, I have also been following this fellow and his balun. Seems the reviews are quite positive and yes the balun ratio seems to be more in-line with matching a loop's resonance. Hard to be 100% sure though! A bit back he posted the actual details and winding diagram, but checking back to help answer your request, I notice he has taken those specifics off his site and eBay, but still includes all the swr plots etc. I'm thinking I had bookmarked that information...I will try to look and see if it's still there for you. On a brighter note as an established eBay top rated and power seller, I do know eBay had set up a global shipping program!...This makes the out of US purchasing and shipping much less expensive...However the big issue is the eBay seller needs to sign up to take part in this program, don't know why he wouldn't as it really don't cost the seller
all that much more to take part, and it allows exposure to sell world-wide right on eBay. Take a look on his eBay listings, don't recall his eBay handle, but you can search the item, I think it's called the AG6IF talented balun, and also loop antenna as he sells the balun alone or with the loop antenna wire. His listing will say if it's set up for eBays global shipping program, if not you can message him-through eBay and request he set it up. It will sure be less expensive shipping using the global shipping program, than buying and shipping through normal channels. I'll look to see if I still have his balun design details bookmarked, but may take a few days as I'm in and out of my QTH here recently. Good Luck Friend! -73- Ross? -KB8NTY- |
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Re: air core loop antenna balun
Is this the gentleman. Windows 7 Home Premium. Regards John Barnett York North Yorkshire Locator?IO93lw Save Shortwave Radio. On 19 February 2014 04:55, <kb8nty@...> wrote:
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Re: air core loop antenna balun
M6MRP-Phil, I have also been following this fellow and his balun. Seems the reviews are quite positive and yes the balun ratio seems to be more in-line with matching a loop's resonance. Hard to be 100% sure though! A bit back he posted the actual details and winding diagram, but checking back to help answer your request, I notice he has taken those specifics off his site and eBay, but still includes all the swr plots etc. I'm thinking I had bookmarked that information...I will try to look and see if it's still there for you. On a brighter note as an established eBay top rated and power seller, I do know eBay had set up a global shipping program!...This makes the out of US purchasing and shipping much less expensive...However the big issue is the eBay seller needs to sign up to take part in this program, don't know why he wouldn't as it really don't cost the seller all that much more to take part, and it allows exposure to sell world-wide right on eBay. Take a look on his eBay listings, don't recall his eBay handle, but you can search the item, I think it's called the AG6IF talented balun, and also loop antenna as he sells the balun alone or with the loop antenna wire. His listing will say if it's set up for eBays global shipping program, if not you can message him-through eBay and request he set it up. It will sure be less expensive shipping using the global shipping program, than buying and shipping through normal channels. I'll look to see if I still have his balun design details bookmarked, but may take a few days as I'm in and out of my QTH here recently. Good Luck Friend! -73- Ross? -KB8NTY- |
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air core loop antenna balun
Hi, looking for the winding details of a 2.5:1 air core balun for a single band loop antenna, I have read lots of arguments against these but still wish to try one against my 4:1 toroid balun out of interest, there is a guy in the USA selling them with good reviews but for the sake of a plastic tube former and some wire it would not be cost effective to have one shipped to over here in the UK, does anybody on this forum have the winding details or a link to constructing one as I cannot find it anywhere?
cheers Phil M6MRP? |
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Re: Alpha Loop
If some owns a Alpha Loop antenna can they post some clear pictures of the coupling box and antenna in general. I think these are great antennas for portable use, from descriptions I have heard they are well built but even the manufacture does not have clear pictures of the antenna on their web page. There are hundreds of pictures of the Alex Loop antenna and with this being a the same type of antenna, it would be great to compare the way they are made. I am currently working on a Aluminum loop antenna made from 5/8 inch wide strips of flat bar about 1/8 inch thick. They bolt together and have a permanent bend to them so when assembled form a near perfect 4 foot diameter loop. I am using 1/4 inch Teflon insert lock nuts, washers and bolt to assemble the antenna. Takes a little more time to assemble than the Alex loop but over all I like the way I have it. From the pictures of the Alpha loop, they seem very similar. Don't have any idea what type of capacitor is used in the Alpha loop but at this point it really does not matter. This loop design is always up for improvements. But if anyone has one of the Alpha loop, some clear pictures and descriptions would be great!
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Re: N3FJP's Nested Loop article 2014 March QST
N6RK-Rick, Hello-sure didn't mean to get you upset...sorry if so. Just with good intentions I wanted to share, some may have been more receptive to it. Having said that-do know I for one personally value your vast-proven knowledge-especially regarding loops-radials etc, You and I had been exchanging messages regarding your "remote tuned" loop design. Last communication was this past November.?I had expressed great interest in a design favoring 80-40-30 meters, you had referenced a 10' and 20' design, with a few tweaks-eliminations of a few diodes. conversation?ended with you stating you were field testing this modified design and was going to check performance of the modified circuit with the 10' loop and also a 20' which would also include 160m! I had continually expressed my interested, but requested?for you?work on it only as you could. Very last message you said possibly over that weekend you may give it a field test...My concerns all along were I wanted you to accommodate my request truly at your convenience as I know you remain busy, I was sincere in my interest request, but after November I received no further communication? I didn't want to harass you or bother you, so I have sat back, checking often for?any follow-up?reply with your findings. When I seen your reply to my QST nested loop post, I thought it may be an opportunity to touch base once more in the interest and hopes of some positive findings, allowing to move ahead. Please follow-up if you wish-off list possibly would be best, I am good on QRZ, or at jrl@... It was good to see you in there-although sure didn't mean?to create a problem with my post. Was just trying to pass on the article to others to view and digest. Thank you Rick, for working with me on my previous interest in your remotely tuned receiving loop and my inquire we previously had been exchanging communication up till November 2013....Thinking something may had come up, so was relieved to see your recent active post- as now I know all is ok on your end friend. Kind Regards Rick. Ross? -KB8NTY- |
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Re: N3FJP's Nested Loop article 2014 March QST
Yet another worthless QST antenna article.
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This is nothing new, it is just the driven element from a quad antenna. Lightning Bolt sold a 5 band quad 30 years ago. Only they wisely used fiberglass spreaders, instead of PVC. PVC is a terrible structural material. They also wisely used a broadband transformer instead of bandwidth limiting 75 ohm sections. The article claims there is no interaction between elements. I don't know how the author arrived at this, but I modeled this configuration a few years ago and found that there is substantial interaction especially on 10 meters. And I modeled it with relays at the feed points to open up the unused loops. As described in QST, it would have even more interaction. Rick N6RK On 2/14/2014 9:17 PM, kb8nty@... wrote:
Check out N3FJP's Loop antenna article in the new 2014 March QST issue. |
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Nested Loop Antenna March QST (duplicate post)
Just wanted to report, my duplicate (not exact) nested loop post was due to a long delay. Well what seemed long as I posted my first, then the next day I didn't see it up yet, so I created another. Other yahoo groups my posts usually post within minutes to less than 1/2 hour so I thought maybe I had made an error in the original post. To my surprise now both appear?...Go figure?...No big deal, just wanted to explain! So anyway regardless checkout the article, I just wanted to share with the group. -73- Ross? -KB8NTY- |
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Re: Nested Loop Antenna March QST
¿ªÔÆÌåÓýOne of club member built a similar multi-band loop out of fiberglass poles and tie wraps.? It performed very well and did many QSLs on field day. 73, Alan - W6ARH ? ? From: loopantennas@... [mailto:loopantennas@...] On Behalf Of kb8nty@...
Sent: Sunday, February 16, 2014 8:28 AM To: loopantennas@... Subject: [loopantennas] Nested Loop Antenna March QST ? ? N3FJP & son?had built a multiband nested loop...looks interesting...and a good read! ? ? It is featured in the March 2014 QST, and is available also on-line. ? -73- Ross? -KB8NTY- ? ? ? ? |
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Re: Loop Antenna Balun
It may be true that HOAs can seem to be overbearing.? But everywhere I know of the homeowner is informed of the HOA before buying the home.?
That said, one of the great things about a loop antenna is that it can have nearly any shape and can be easily disguised within the normal architectural features of nearly any home.? After all, it is just a piece of wire.? :) |
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Re: Loop Antenna Balun
HOA = Home Owners Association, also may be known as the Nazi Architectural Control Committee, etc. that often abitrarily and strictly enforces silly regulations and rules created usually by a small group who want to control how others live, and charge you for the privilege...fortunately not all neighborhoods have one.
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Nested Loop Antenna March QST
N3FJP & son?had built a multiband nested loop...looks interesting...and a good read! ? It is featured in the March 2014 QST, and is available also on-line. -73- Ross? -KB8NTY- |
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N3FJP's Nested Loop article 2014 March QST
Check out N3FJP's Loop antenna article in the new 2014 March QST issue. ?Don't have it yet, it's also now on ARRL website. Interesting read... -73- Ross? -KB8NTY- |
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Re: Loop Antenna Balun
Harry, I have used an untuned loop about 90 feet circumference ( a two turn loop sides 6 metres x 2 metres, hung under the eaves at this QTH.) The plane of the loop North/South used it to listen to the Sydney Hobart Yacht race. Armchair copy, you could almost swell the salt air! Positioning it on the roof may make it susceptable to mains bourne QRN. Could you position it under the eaves of the building Am not sure what a HOA is. Give it a go, temporarily? at first, if it's OK make it permanent. Tuned loops need to be say 1/3 to1/4 wavelength and brought to resonance capacitivly. An untuned loop will have a basic resonance derived from its native inductance and capacitance. Again give it a go. Regards Max VK2TTI
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Re: Loop Antenna Naivete
It is fascinating that I would compare any antenna, except in an antenna shoutout, to a loop. I find that fascinating because no where in the design of a small Magnetic Loop Antenna will you find the formula used on the other antenna systems used (i.e. 468/frequency mhz). When an MLA is tuned, for the RECEIVE side there is indeed an increase in the noise floor, a VERY big increase. To say that the receiver does not benefit from a lower SWR is wrong. Also wrong is that the loop is anything but inefficient, rather the efficiency of a loop is higher than other wide band antennas like a dipole. Isn't it true that the effective radiated power is greater from a loop than a traditional dipole?
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Re: Loop Antenna Balun
? Harry, ? Might you not be better off with an easily homemade multiband dipole, cut and orientated to the frequencies/regions of your preference? Such an antenna is easily hidden, too and its installation may not even contravene your local legislation. ? J. |
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Re: Loop Antenna Balun
A 100 foot long receive loop makes no sense. Receive loops
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need to be less than 1/3 wavelength at the highest frequency, which would limit you to 3 MHz. You should probably be looking at a Pixel or Wellbrook loop, 3 foot diameter. You should be able to deploy that even in an HOA. Rick N6RK On 2/14/2014 10:12 AM, hmholden69@... wrote:
I live in an area that has HOA rules against outdoor sw antennas. I |
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Loop Antenna Balun
I live in an area that has HOA rules against outdoor sw antennas. I think my best bet is a stealth loop antenna laid directly on the roof. It would be trapezoidal in shape and about 100 feet long. I want to feed the receiver with small coax {RG 174}. I want to make a balun on a ferrite rod or air core type. I have some torrid cores but go crazy trying to wind them. Any ideas on the ratio I need {4:!, 9:1, etc} and a place to get plans for winding.This will be a? receive only antenna.
Harry |