I have only 10 Yagi's in the air but I do the same, no caps and no rope. I quit using end caps when I purchased a few Telrex beams in the 80's that did no come with them. I realized that they were un
I used to have a 20m Hy-Gain beam in addition to my stack of homebrew Yagi's. I used no rope and it shed element tips constantly. I am not a mechanical engineer but I believe the tips break because t
My TH7, assembled according to the manual with ropes and end caps, was up for almost 30 years, with no failures. I do wish I had noticed before I put it up that a few of the parts weren't stainless.
There are those who swear by anti-dampaning rope and some who swear at the technique . Having installed numerous type of manufactured antenna one fanonimum is eveadent. Certain designs have a self me
HI Scott: All homebrew Yagi's here - and yes, made strong enough with Yagi Mechanical software. In the process of replacing the 40 meter Yagi's here this summer. 28 years is enough for these elements
Hi Tim, I know aluminum has a finite fatigue life, no matter how low the stress, but how do you know when to replace an antenna, unless it has failed? 73, Scott K9MA -- Scott K9MA k9ma@sdellington.us
I think the topic "resonance of yagi elements" has a total attention in publications of about zero. Then the topic, "coupled resonances of yagi elements" has substantially less coverage. With a big s
But why do we care, Don? RF current flows on the outer surface of the elements. To me, the only issue is corrosion at junctions, which is a separate issue that others have well addressed. 73, Jim K9Y
Author: Steve via TowerTalk <towertalk@contesting.com>
Date: Sun, 21 Jul 2019 06:41:06 -0400
I used fiberglass type window screen rolled up tight. Made like a cigarette filter and put in every element and boom ends. Had trouble with mud wasps or similar insect building nests and causing corr
Jim, I once had a yagi with end caps on the boom that failed due to a huge amount of water inside the boom. Also had one without caps that had bird nest in one end...not a good situation. I prefer to
On 7/20/19 6:35 PM, Richard Smith wrote: I believe that the rope in the elements, specifically the element tips, is particular to the Hy-Gain yagis, at least the 20, 15, and 10 meter designs. I have
On 7/20/19 6:46 PM, john@kk9a.com wrote: I used to have a 20m Hy-Gain beam in addition to my stack of homebrew Yagi's. I used no rope and it shed element tips constantly. I am not a mechanical engin
It has zero attention in ham publications. I can assure you it has a lot of attention in things like spacecraft design, power line design, etc. ALL structures are coupled resonators of some sort, and
If you have been using the same 40m OWA design for 28 years, that would be impressive. Are the new beams going to be any different? What boom diameter do you use? John KK9A HI Scott: All homebrew Yag