Good afternoon ! Having heard enough negative on the Polygon, we have shifted to Phillystran.. What I have read says you must run EHS Leaders (I have Plenty in stock) but not over 50% of the total gu
i recently put up 70 feet of Rohn 25 using Phillystran. The first 4-5 feet from the tower are EHS, to minimize the chance of something dropped from the tower cutting the Phillystran. From the anchor
I had a problem with just Preforms attaching to the tower legs connection - which caused distortion in the pattern of close mounted Yagi's. That is, Yagi's that were mounted only a few feet above a g
Thanks Tim, I will add supplies for that to the list. Do you think the 41' of EHS at the anchor ends will be OK ? Ron _______________________________________________ _________________________________
Hi Ron: I dont know what other antennas might be around your guy anchors, but 41 feet of EHS is too long for my taste. My EHS ground leaders tails are no more than 12 feet long. Remember when modelin
So this arrangement moves the preform away from the tower leg? I am rebuilding my tower and have three TIC rings mounted about 4 feet above the guy mounts. 73, Keith NM5G I had a problem with just Pr
It *disconnects* the preforms from the tower legs. I must say I'm surprised that this action was needed when talking about 40 meters, but if one wants perfection, and sees SWR changes with antenna ro
The problem with Preform connections is much worse as you go higher in frequency. I only had a photo of the 40 meter install. Knowing what I know now I would never direct connect a Preform to the tow
How is the shackle to the tower connected to the insulator? I may want to add some to my top guys. Tnx. Al N6TA The problem with Preform connections is much worse as you go higher in frequency. I onl
Hello Al: I use a Bent pin shackle around the insulator that is connected to the tower guy ear. https://www.dxengineering.com/parts/dxe-bps-j732 73 Tim K3LR How is the shackle to the tower connected
I am not sure how you know that the pattern was distorted but I think this is a good practice Tim. My top homebrew 15m beam has a higher SWR than the lower two - 1.4:1 vs 1.1:1. Just below the top an
Hi John, It's easy to see pattern issues with using a Elecraft XG3 generator https://www.dxengineering.com/parts/ect-xg3 to excite the antenna under test. Then use another antenna (almost any horizon
An added observation is the preforms on boom guys can interact. I notice this on my 10m 5 + 5 stack with swr a bit off. These antennas previously used Nicopress sleeves on the Phillystran. Recently,
Author: Mpridesti via TowerTalk <towertalk@contesting.com>
Date: Thu, 3 Oct 2019 10:46:48 -0400
Tim Thanks for bringing up the use of the XG3. Recently acquired one and was wondering how I could do some near field measurements. Any other particulars I should be aware of regarding pattern testin
For those who live in an area with wildfire danger, consider that the flame lengths from tall grass and shrubs can be more than 15 feet, and phillystran-melting temperatures above that. You will need
Been there, done that. In 2013 our wildfire had flame heights of over 100 feet. Not much you can do to protect against that. Just plan on tower replacement afterward. Ken K6MR For those who live in a
Yes, when you have tall trees and high fuel loading, there are bigger wildfire concerns than melted phillystran. 73, Steve, N2IC Ken K6MR -- *From:* TowerTalk <towertalk-bounces@contesting.com> on be
I was not originally realizing this preform discussion was talking about Phillystran. So are we saying that the 4 ft long preform, attached to the tower, is actually affecting the 40M yagi as it turn
Hello Ed: It is the combination of three preforms at the guy point and the tower face. The problem is worse as you go higher in frequency (20, 15 and 10 meters). K3LR uses two Moxon's and three full
I used 29 feet of EHS per guy, which put the lowest Philly at about 10' above ground (a somewhat tricky calculation as the tower is on steeply sloping terrain.) The tower is in a mowed field where gr