Of course I meant that I use 3.00" (not 300) diameter boom on my 20m
beams. One reason is that the DX engineering heavy duty insulated brackets
that I use are made for 3" boom and they fit my 1.25" diameter elements
perfectly.
GL,
John KK9A
Sent via the Samsung Galaxy 7 edge, an AT&T 4G LTE smartphone.
On Thu, Nov 2, 2017 at 11:45 PM, Bob K6UJ <k6uj@pacbell.net> wrote:
> John,
>
> I see your point. Thanks for your insight on this.
> I have a good inventory of 2" dia boom tubing from former Force 12
> antennas and also the great Force 12 element to boom brackets for 2" tube.
> So no sense on working any more on modifying the boom. I will go with a
> truss cable and be happy. A reality check was needed
> here hihi The YagiMech program shows the yagi is rated for 100mph with a
> truss.
>
> Bob
> K6UJ
>
>
>
>
> ------------------------------
> *From:* "john@kk9a.com" <john@kk9a.com>
> *To:* towertalk@contesting.com
> *Sent:* Thursday, November 2, 2017 7:25 PM
> *Subject:* Re: [TowerTalk] acceptable boom sag ?
>
> I truss is so simple to build and inexpensive, why are you against having
> one? I use a 300 "x .125 boom on my HB 4el 20m OWA and a truss.
>
> John KK9A
>
>
> To: "towertalk@contesting.com" <towertalk@contesting.com>
> Subject: [TowerTalk] acceptable boom sag ?
> From: Bob K6UJ <k6uj@pacbell.net>
> Reply-to: Bob K6UJ <k6uj@pacbell.net>
> Date: Thu, 2 Nov 2017 23:58:38 +0000 (UTC)
>
> I am trying to eliminate truss wires if I can on a 4 EL 20M yagi I am
> building.Using DX Engineering's Yagi Mech software I show about 5.5 inches
> of
> sag
> on each end of the 30 foot boom. I am using 2" OD .058" wall tube
> sectionsfor
> the boom. The 5.5 inches of sag is with the center two boom sections
> sleevedto
> .116" wall thickness. Without the sleeved center two sections the sag is
> about
> 7.5 " on each end. New to using this software and not sure what sag is
> acceptable either.What are your thoughts ?
> BobK6UJ
>
> _______________________________________________
>
>
>
> _______________________________________________
> 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
|