[TowerTalk] Trussing of antenna elements

[Grant Saviers]

If you have a copy of Leeson's Mechanical Design of Yagi.. he covers it 
in depth.

Attach the guy to the element where there is at least double thickness 
as in a overlap joint.  If you triple wall then a vertical hole and eye 
screw (forged and galvanized best) can be used.

Phillystran is the guy material to use.  At the inboard end use a Big 
Grip.  Since you are going to adjust this antenna a Big Grip might work 
at the outboard end.

Otherwise you have to use cable clamps (which I strongly dislike on 
PS).  I have also seen Nicopress sleeves used on PS on several antennas 
I purchased used.  They were in good shape after 7 years and known icing 
that bent an element on Leeson's 110mph design (scratch built correctly) 
40m Moxon.  oops.

The center post needs to be strong and taller is better as that reduces 
stress levels all around.  Think 3 to 4' above the boom.

Grant KZ1W


On 1/21/2016 16:28 PM, Larry wrote:
> I forgot, but I think element trussing was discussed in ON4UN's Low 
> Band DXing book and in Lawson's book. I am not at
> place where I can check.
>
> 73, Larry  W6NWS
>
> -----Original Message----- From: Bill Conwell
> Sent: Thursday, January 21, 2016 6:44 PM
> To: towertalk at contesting.com
> Subject: [TowerTalk] Trussing of antenna elements
>
> I am toying with the idea of rebuilding a surplus M2 40M3L into a WARC
> antenna, with full-size elements on 30m (as well as other elements for 
> 18m
> and 12m).
>
>
>
> Due to local wind and ice, I’d like to truss the 30m elements. The
> original M2 antenna trussed the 40m elements with linear loading 
> rods.  The
> central truss supports were a mere 10 inches above the centers of the
> elements (I presume to keep the linear loading rods sort of 
> horizontal). With
> the linear loading considerations gone, I could raise the truss points
> higher than the present 10 inches.  Is there a good reason to do so?
>
>
>
> Relatedly, what’s the preferred way to connect trussing cables (e.g.,
> Phillystran) to the elements?  Shall I drill vertically through the
> elements and install stainless steel eyebolts at the connection 
> points?  Is
> another Phillystran-attachment arrangement preferable?
>
>
>
> (Is there a definitive reference work that addresses trussing of antenna
> booms and elements?)
>
>
>
> Tnx,
>
>
>
> /Bill, K2PO
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