Dear sir, thank you for this video. I have been very interested in OCF antennas, making them in particular. Your presentation was helpful. It is embarrassing that the ham world has its share of negative commenters. Please ignore their sad efforts. Best wishes from S.E.Tennessee, 73 KQ4IXD
Anybody? I'm tripping over the terminology "Balun vs Unun" when it comes to OCF's. This video @11:25 shows a Summary reprint of a 1988 QST article on OCF's and the transformer is identified as a "4:1 current balun". I learned to respect without question the tech stuff in QST but is their use of the word "Balun" is a poor choice of words or am I mistaken? I'm in the midst of an OCF install. My wire is up but my 4:1 Balun /CMC choke combo (copied from TRX labs on UA-cam) complete. swr's bad when up in the sky. On the bench with 200 ohm it's wonderfully flat 10-40m. Should I rewind the balun section of the TRX Lab's design to be a proper 4:1 Unun?
Like Ted, I'm a big fan of OCFDs. I'm often asked to help other hams with theirs. And I've abandoned the 1/3-2/3 split long ago. Anyway, I'm always surprised at how many hams not familiar with how an OCFD works that think they can trim 40 meters by adjusting length of the long wire, and adjust 20 meters by adjusting the shorter wire. This is NOT how an OCFD works, you can not adjust bands individually like with a fan dipole.
Excellent explanation of the OCFD, my main QTH antenna. At school, the x-axis went left to right, and the y-axis went up and down. I'm in the UK. Thank you for the presentation.
It's "Common Mode Current", not common current that flows on the outside of the shield. Then there is differential mode current that flows on the center conductor and the inside of the shield.
Ignore the trolls. Great video. Thanks for posting. You are an excellent speaker. I'm glad I watched!
73, N4MJR
Like the talk. I learn so much that I might need to make one of these…
Very good presentation
Dear sir, thank you for this video. I have been very interested in OCF antennas, making them in particular. Your presentation was helpful. It is embarrassing that the ham world has its share of negative commenters. Please ignore their sad efforts. Best wishes from S.E.Tennessee, 73 KQ4IXD
Anybody? I'm tripping over the terminology "Balun vs Unun" when it comes to OCF's. This video @11:25 shows a Summary reprint of a 1988 QST article on OCF's and the transformer is identified as a "4:1 current balun". I learned to respect without question the tech stuff in QST but is their use of the word "Balun" is a poor choice of words or am I mistaken? I'm in the midst of an OCF install. My wire is up but my 4:1 Balun /CMC choke combo (copied from TRX labs on UA-cam) complete. swr's bad when up in the sky. On the bench with 200 ohm it's wonderfully flat 10-40m. Should I rewind the balun section of the TRX Lab's design to be a proper 4:1 Unun?
Are these in Magnetic or True for 45 degrees and 150 degrees?
Your azimuth is not the same as his location. The map is on the internet. It is very enlightening.
Like Ted, I'm a big fan of OCFDs. I'm often asked to help other hams with theirs. And I've abandoned the 1/3-2/3 split long ago. Anyway, I'm always surprised at how many hams not familiar with how an OCFD works that think they can trim 40 meters by adjusting length of the long wire, and adjust 20 meters by adjusting the shorter wire. This is NOT how an OCFD works, you can not adjust bands individually like with a fan dipole.
Excellent explanation of the OCFD, my main QTH antenna.
At school, the x-axis went left to right, and the y-axis went up and down. I'm in the UK.
Thank you for the presentation.
Excellent talk!
It's "Common Mode Current", not common current that flows on the outside of the shield. Then there is differential mode current that flows on the center conductor and the inside of the shield.
Common Mode Current "is" RF current flowing on the outside of the shield.
Then make your own video and grace us with your superior knowledge.
Dx at 30 degrees? Ok there bud.