If the beam is more than 10' away from the guy grips, it may not matter. In
my case it was just above and the SWR was very much affected. I estimate the
grip plus attachments without the egg insulator resonates about 21.5 MHz
73 John N5CQ
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of John Simmons
Sent: Tuesday, October 11, 2022 7:16 AM
To: towertalk@contesting.com
Cc: towertalk@contesting.com
Subject: Re: [TowerTalk] Phillystran to steel tower connection.
I literally just got done re-doing the top guys.
*NOW* you tell me!
--
73,
-de John "Curly" NI0K in rural Debs, MN USA Hamshack Hotline: 6100000271
https://www.qrz.com/db/NI0K
Tim Duffy wrote on 10/11/2022 4:02 AM:
> Insulators at the tower end are very necessary if you have Yagi's
> close to the Phillystran attachment point.
>
> The problem is significant and is caused by the preforms that are used
> to terminate the Phillystran. The preforms are of significant length
> (metal) and when they are directly connected to the tower, they will
> interact and significantly reduce the performance of the Yagi. This
> has been proven in field and computer modeled studies.
>
> All guy wires at K3LR are Phillystran and all have insulators with
> bent pin shackles at the tower connection point. This solves the problem.
>
> https://www.dxengineering.com/parts/dxe-ins-p1
>
> 73
> Tim K3LR
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
> John Langdon
> Sent: Tuesday, October 11, 2022 4:48 AM
> To: 'James M. Galm, W8WTS'; towertalk@contesting.com
> Subject: Re: [TowerTalk] Phillystran to steel tower connection.
>
> Jim,
>
> See the photo at
> https://drive.google.com/file/d/1eu8pSe_UvdPCsdKR5-trK3GlmE-G1SfV/view
> ?usp=s
> haring
>
> The 15M beam just above this guy ring had major SWR issues before this
> insulator was installed, and this fixed it.
>
> 73 John N5CQ
>
>
> -----Original Message-----
> From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of James M.
> Galm, W8WTS
> Sent: Monday, October 10, 2022 10:11 PM
> To: towertalk@contesting.com
> Subject: [TowerTalk] Phillystran to steel tower connection.
>
> I understand from previous posts that there is value in connecting a
> Phillystran guy cable to the steel tower with an insulator. This
> avoids grounding the 3 ft long Phillystran big grip to the tower
> connection point, which will distort the pattern of nearby yagis.
> What have people done to connect the insulator to the tower? It would
> not be sensible to use two EHS big grips back to back with a short
> piece of EHS between them (one EHS BG at the insulator and the other
> at the tower), as that would defeat the purpose of the insulator. Is
> there a connection means between the 502 insulator and a thimble that is
only a few inches long?
>
> 73,
>
> Jim, W8WTS
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|