Hello Bob -
Today I had a tree climber install a True Ladder Line antenna and when I went to check it out using my LDG-600 Pro II auto-tuner and a Palstar B4000 balun, I found it would not tune (SWR >3:1) on 75m/80m, my favorite bands. The LDG just gave up with an error signal. :-(
I thought I would have to alter the length of the feedline, but then I decided to try your 4124T that I bought back in August 2017 when I thought I had a balun heating problem (it wasn't). I had swapped back to the Palstar thinking I would use the 4124T outdoors at the base of a tree with window-line up to the antenna, but that project never happened.
After I replaced the Palstar with your 4124T the SWR was 1.2:1 on 75m and 1.8:1 on 80m, both acceptable to my ALS-600s amplifier. It is flat on 40m/30m and 1.2:1 on the higher bands.
I would not have thought that changing the balun would make so much difference, but I know the 4124T is designed for better response at lower frequencies than other baluns. It seems 10x heavier than the Palstar. :-)
It certainly saved me a lot of trouble trying to adjust the feedline, but I may still tweak it to see if I can get the SWR a little lower (I'm a tweaker ... I subscribe to 'If it ain't broke, fix it until it is broke.')
I wanted to tell you how your quality product saved the day. :-)
Thank you for such a fine product.
Today is Dec 2 2017. I recently installed an Inverted L for 160 meters and tried it out last weekend in the CQWWCW contest. It played ok, but my feed point resistance of 25 ohms was not matched well and it caused amp problems.
So, I pondered what to do, and considered all sorts of options like running 2 50 ohm pcs of coax in parallel for impedance matching and winding a coaxial "ugly choke" to block common mode current (using elevated radials). Rather than taking those measures, I found "Balun Designs" and ordered their 25 to 50 ohm 5kw UNUN model 1235t. My amp (Yaesu Quadra) only does 1kw, but I wanted overkill ! This weekend, I am trying things again in the ARRL 160 contest using the Balun Designs UNUN and am pleased to report (after 224 qsos) all is working FB. It made my Inverted L "come alive". The UNUN accomplishes both impedance matching (swr 1:1) and common mode current blocking.. Kudos to Balun Designs.
I’m new to the world of HF, and due to living in a townhome I’m in a difficult position when it comes to antennas. I made my own EFQW, and while it works suitably with my tuner the SWR is still higher than I like at times. A number of knowledgeable people told me that an EFQW didn’t need a balun, but if I’ve learned one thing over the years it’s that the more confident someone is, the less they tend to know. I opted to try one of your 4:1 baluns, as long with a 1:1 balun at the transceiver to see if it could help bring the noise down.
To keep a long story long, your 4:1 balun brought my SWR down closer to 1:1, and my tuner now spends dramatically less time clacking away trying to clean up my mess! The 1:1 balun brought the noise down a notch or two, but more experimentation is needed on my part.
Finally got my Home Brew Skyloop in the air on Sunday. It is, at it's highest point, 35 Feet. I positioned the Balun per your instructions. It works amazingly well. When I first did a contact with a net on 80M I did not realize I was only powered to 40W but most of the stations reported 5/20 with great audio. Thanks for your product and your help. I will always recommed you to anyone who asks about a Balun. (Used to be a Unidilla Fan)....
Thanks and 73's, John
This short note is to congratulate you on the “behavior” of your latest balun 1116di, which I find excellent. At this particular time I am surrounded by several tall buildings under construction, and you can imaging the electrical noise coming from gasoline engines of pumps, winches, and concrete mixers of all sorts in the surroundings, and coming from several buldings in a choir of sorts.
And I thought you might be interested in knowing something I found with the new balun: I very seldom get out from home because I find it very painful to walk, So one of the things that entertains me is recording music, using an iMac computer and an exterior Samsung disc writer costing all of 30 dollars; and the recorded sound is excellent as the noise is eliminated by the Balun, especially in my case for I have a vertical coaxial cable measuring 150 feet from the top of my building to my apartment. I have the computer, plus an ICOM 7200, plus a 300 watts amplifier by Hy Tokyo (I hope it is written this way), and the balun cleans most of the interference…
Thanks again, Cliff
thank you very much for the products that l purchased some time back. the quality is the best l have seen . l could not resist temptation and removed the cover of one only ocf 4;1 balun, l was like an art critic looking over a canvas painting. more than l expected the quality and precision all exacting, just perfect and yes all work perfectly.
thank you again bob, magnificent products.
Eham Review of competing product
The biggest issue I have (with the U******) is the tendency of the core to saturate during longer operating sessions.
A friend is running his end fed with a Balun Designs 5KW 9:1 (Model # 9135) using the same configuration, wire gauge, counterpoise, etc I use. There is no comparison. The Balun Designs 9:1 absolutely blows away the U****** matching unit. Lower SWR across the bands, no saturation, and the core stays stable. I have ordered a 9135 but will keep the U****** unit as a back up.
The U****** is a good antenna for what it is. Comparing it to the Balun Designs unit is like comparing a BMW to a Ford. For those of us with restricted real estate, my advice would be to get your hands on a Balun Designs 9:1. It is significantly more expensive but it just plain WORKS. Keep your U****** for your back up, bug out bag, Field Day, etc
I use your UnUn 9130 for about 1 month in various locations in Chad with the following setup. Radio Kenwood TS-50 + MFJ-971 portable tuner + 7 meters of RG58 cable to connect the UnUn 9130. In some places I use only 12m of 1mm wire and on other location have used 26 meters, but I always been able to tune the antenna for a low SWR value.
The setup worked very well, especially with a good length or wire, I made QSO with all continents. Also worked Japan on 80m, VK, EU, USA on 40m.
I recently purchased two Model 16132 UNUN’s (32 to 50 Ohms). I have installed each UNUN on “home brew” 40 meter band 1/4 wavelength verticals, 1) a portable ARRL Field Day antenna with three insulated radials and 2) a fixed station vertical antenna with four insulated radials. Both UNUN’s replaced DX Engineering 1:1 baluns. When installed and tested, the Balun Designs UNUN’s have greatly improved the performance of both antennas with lower VSWR and wider bandwidth. Your balun and UNUN engineering design and quality production is outstanding!
I want to thank you for having such a quality product. I was speaking to a ham on the air a few months ago - he said that your 9:1 unun had really
changed the ability for him to throw out a good signal. I've already ordered (and installed) one for myself, one for a friend, referred a friend
(who purchased) and am about to today order another one to help yet another buddy of mine install a decent end-fed wire.
The ability to eliminate a mismatched run of coax - with all of the negative consequences involved - means that QRP work will be happening more
often now. I ended up installing one at my mother's house, as I'm spending more time with her as she ages - and the 175 foot run of wire at 20 feet on the low end and 100 feet on the high end means that I can work literally anything that I can hear. (of course, it doesn't hurt to have 1/2 mile of
barbed wire fence directly under the feedpoint as a great counterpoise!)
At any rate, you'll be seeing more orders coming out of the Memphis, Tennessee metropolitan area as I educate folks on how to avoid the fallacy
of their rigs' built in 'antenna tuner' making them think that all is well.
Take care and have a blessed Thanksgiving.
i want to let you know i received my order - QRP 4:1 unun - arrived today. thank you for such good service and a quality product. your workmanship is outstanding and i'm sure it will perform as advertised. that compliment is coming from a custom cabinet maker! thank you again,
Just wanted to drop you a quick note about the balun I purchased. As I said on the phone, I have learned that you get what you pay for! Thank you for a super quality product. My SWR’s on 20, 40 and 80m are all 1.3 to 1 or lower. My receive is so much quieter and I’ve hammered this thing with legal limit all weekend and worked the world with no issues what so ever! This balun does not saturate!! A quality product made with pride in the USA. I assure you I have become an unofficial salesman for Balun Designs! Thanks again Bob, I will be making future purchases from you this fall when I put some more wire in the air!!
They lesson here is get the real deal, not some cheap look-a-like.
Thanks for building great products.