RANDOM WIRE ANTENNAS USING THF LDG 9:1 UNUNS

Thank you, Peter. Your explanations are so thorough I finally feel like I can understand these issues. I have both LDG 9:1 and the 1:1 choke. Your explanation of the counterpoise was most welcome.

Wow! This is a classic presentation that everyone interested in end-fed random wire antennas and 9:1 ununs should view. I think it is Peter's best presentation, and may be the best available on the practical aspects of feeding and optimizng end-fed random wires.

This is the best discussion of both the random wire antenna and the unun that I’ve ever heard! Thanks!

I use 130 feet of wire on my endfed. People have gone to 203 feet and longer. That is what I have planned for my next endfed.

I could listen to you all day long, please don’t stop the videos amazing

Back in another life in the Royal Signals... the random wire was my best friend! We parked up in an underground area on a chicken farm during an xcercise. I was the only one with comms due using a coax out to a unbalun connected to a very long fence!

Sir, you’ve been the single most helpful source for me to learn from as I look into HAM radio. I’m a pilot and assumed I’d understand more about radio, but boy was I wrong. So, thank you and keep up the great work!

Bravo! Finally someone explained the basics of antenna design in an English I can actually digest. Thank you!!!!

Hello Peter.. Thanks for this video, im sure my eyes didn't move while watching this one. Antennas, and especially cheap simple easy to erect antennas are very interesting.. I use a small 10m wire and 9-1 unun at 7ft high. Worked stateside and most if Europe quite frequently. Didnt know about the line isolator though. Fantastic presentation. Many thanks. Gary.

Great video, Peter. Your opening does sound like a Monty Python spoof, however.

Your comments at 9:20 onward helped me better understand the relationship between low SWR and impedance. It stands to reason that the 49:1 is happy every time it sees 2450 ohms. Brilliant. Oh, by the way, we put quarter-wave end-feds on our rigs all the time. It’s called an HT, hi.

Wonderful discussion, sir! Thank you for sharing your experiences and very helpful information.

I have two of these 9:1's and they work very well. For wire I found speaker wire is very cost effective and it comes in thin sizes that hide easy.

A well thought through presentation Peter. I use a 9:1 to some success, Brazil on 10w whilst sat in the garden. Yes I needed to use the tuner. A counterpoise or mix of radials are a must.

+1 on using a line isolator! Using a 9:1 random wire setup without one with just 10W on 15m made my PC do some very strange things, it was like there was a ghost in the machine. A bit shorter wire than yours worked well for close European contacts on 20m SSB with only 4W along just the top of a 1m high fence. Turning it into a sloper with the far end on 7m pole got me out to eastern Europe and one in to Asiatic Russia still on QRP SSB. I was really surprised what a bit of cheap wire could do. As you say, it will be good for portable or those starting out on HF on a budget. Mine is self wound, but found it fiddly to do so would probably just buy one of these if needed another in the future.

This is one of the best, most concise, and (most importantly) technically correct explanation for these types of antennas. Thank you! 73 from NJ USA 🇺🇸

Thank you Peter for the clarifacation on 9:1unun. I have one I tried to use on a short feeder cable of rg58 which is about 12ft long, I measured out 65 ft for the antenna, and I was using no ground earth, and was disapointed on some of the higher swr readings, and therfore thought it was faulty, the atu I was using is a edx1 from Alinco, my shack is in a stone building and a ground post is very possible in fact I have one to install now on watching this I am less worried I have been setting up correctly, The un un I bought was commercially made. I also made a line isolator on ferrite FT240-43 FERRITE TOROID from ebay and put it on the antenna side of the ATU. The radio I am using is ts130s I have had some contacts on it, and now you have put my mind to rest on this situation, as I did not want to damage the radio. I intend now to watch more of you videoes and have suscribed regards G1GDB

Thanks, Peter! A very informative presentation to help with my portable 40m QRP station. You have moved my timeline forward to getting me on the air. 73-Allan KA3FBL

I have learned so much from you. Thanks for this great video.

Great video. I am using the LDG 9:1 UNUN. I have it placed at the bottom of an inverted L. My feed line is a 100ft. RG 214 low loss. At first it worked fabulously from 80m to 10m. Then after a month or so all was lost. Upon inspection, the UNUN had filled with water. It's not supposed to do that. So they claim. Drained and dried out the UNUN and sealed. Mine wasn't initially sealed. Now it works again but it seems I do not get out as well as I used to. VSWR is very acceptable among the bands. Kind of confused at this point. I gave recommended the use of the 9:1 to several of my ham buddies a while back fo their end fed set up. Theirs have been working great. Man I love this hobby. Keep the videos caming. Have fun, stay safe and stay healthy.