600 ohm ladder line length adjustment and tuning

[@acestudioscouk-Ace-G0ACE]

Thanks for the video, how did it work out in the end?

[@nrfchannel8580]

Nice instalation

[@izzzzzz6]

Van I use a VNA with open wire? I want to test with a vna at the feedpoint of an inverted V and i was wondering about then using a vna to tune 300 ohm ribbon?

[@jonthebru]

I have just put a doublet up. I'm trying to find more concise information on tuning the feedline but most information is very general in nature.

[@user-qm5vs3ik3b]

podczas deszczu masz wode w rurce.Leprzy 8mm poliamid walki.sa lekkie i wystarczy naciac z bokow.

[@joewilson2258]

Your balun is wrong for matching the ladder line to fifty ohms for your radio station so you need a 12 to 1 balun or a unun to get the match you need .

[@robertrumsey1609]

Sorry but your statement regarding the balun is quite flawed. You are suggesting the balun ratio used should match the characteristic impedance of the feedline (600 ohms) instead of the actual impedance that exists on the feedline. Here is a good tech article that will explain why www.balundesigns.com/blog/baluns-for-multiband-antennas-fed-with-open-wire-or-ladder-line/. A good 1:1 or 4:1 balun is a much better choice and ununs should only be used for unbalanced antennas such as verticals, longwires and inverted L's.

[@artc9114]

@@robertrumsey1609 100% CORRECT.. We are not making the radio happy as they say.. We are keeping the tunable antenna system happy..

[@robertvantichelt6448]

You can use a 1:1 balun if you use the correct length of ladder line. If you have the proper length, the end of the ladder line will have the same impedance as the dipole feed point. It will vary based on the frequency you are on.