How Many Ferrite Beads on an HF Antenna? What is Coaxial Cable? What are Common Mode Currents?

NEVER DOUBT, The "your Elmer" is so true, will always refer to these videos... as needed... Thanks Jim, these videos so very much appreciated !!!

Great vid, Jim! I look forward to the next one with Mark's box. Interesting that Mosley Antennas docs say this isn't needed, then they go on to recommend a coil of coax right at the feedpoint. Others have said that a coil of coax is ineffective compared to beads or toroids. I believe the science and measurements myself! -de NI0K

Thankyou Jim a great little video

Wow, 10 seems like a lot. Another option might be looping the coaxial cable around a ferrite ring several times.

Great subject Jim. Wish I had this info a year ago when I was starting out but I’m very happy to have it now. Keep up the good work!!

Thanks Jim. Great to see you back and looking good and healthy. AG7UJ

This was well explained. Thank you very much Jim! I’m home brewing a vertical for static mobile use and was wanting to use beads to make the choke. This gave me the nod. 73zzz!

Jim, another home run… great video!

Jim I hope you feel better soon. Thanks again for a great video and all the valuable help you have given as I set up my first station ! All I want is the best sound I can get !! I just ordered rg-213 coax and now my questions on chokes have been answered ! Next up is finding a compatible antenna tuner that I can use with an Icom 735. I will do a lot of listening across the bands and then use the 735 some on 10 meters until I take the general test ! Best Wishes

Important subject, under exceptional conditions, very much appreciated, Halibut Electronics do indeed provide a great piece of test equipment. 👍 73. ( The New Choke Cookbook, is a great resource too).

Wow, Jim. This is something I have always wondered about and you have answered it and more as I need to check to see if my beads are a 31 mix and fit tight against the coax. Thanks again! Alan KZ6B

I wish everyone would teach in your manner

This one makes the top 10 list! Great piece - really helps explain this concept. Thanks Jim ~ 73. KN6ETI

Another great video...Jim can u not just wind the coax to achieve the choke at the antenna? Hope to hear you on the band soon...73's NX8T JIM

Hey thank you so much for the education on trying to straighten out my sons RFI problem due to high tension lines above house

Good video Jim! With regards to the ferrite beads - I believe that a K9YC put out the Choke Cookbook back in 2018 and he also found that the ferrites were not consistent in their testing he conducted. It's worth a read if you have time!

Appreciate the Help. Very Good Idea, THANKYOU 👍

Jim I really need to find the video you did on calculating loss from using a tuner to correct SWR and all the corresponding loss in RF. You explained it perfect how the 100 W eventually diminished cycle after cycle. Done so well. I want to educated some folks with this valuable data. Had someone say just add power. No way to convince them of the actual theory. You are are appreciated. Trust your health is improving . Love all your presentations. Is there a list of all your presentation. You are the gold standard. Richard KC6ART

Good stuff Jim! 4:1 Balun works great on my G5RV

I have a single Mix 31 snap-on with the coax making 6-7 passes in a loop. Is that roughly the same as having 6-7 beads in tandem on a straight piece of coax? Or do the loops add a capacitive element, too? My Rigblaster interface freezes during FT8, but only on 20m and only occasionally. Therefore, I still think I may have a tiny bit of common mode on 20m... it's only noticeable with the Rigblaster (voice is fine). I find myself considering a second bead snapped on the same loop to "double" the choke's effect. Will it work that way? Thanks! -Scott, KE4WMF