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LF: Re: Antenna mast

from [Alan Melia] [Permanent Link][Original]
To: <[email protected]>
Subject: LF: Re: Antenna mast
From: "Alan Melia" <[email protected]>
Date: Mon, 10 Sep 2012 19:07:34 +0100
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Sender: [email protected]
Hi Terry I have put up 60 ft masts with dural scaffold pole and sleeve joiners. The problem with the method is you need a lot of real estate and 12 guys. No trouble with "bendies" and a couple of 4m beams on top. An unguyed pole would need a lot of stiffening, and steel poles will bend just like dural( I have some bent bits to prove it ) and are much (much) heavier.
 
 I have a 53 foot pole which is a 20ft joined to 16 ft. ( nominal 2in. dural) these are hinged at about 3ft above ground ( Barenco hinged, U-bolted plate ) to a 18 foot steel pole set in concrete. The top is 1.5 inch TV pole( slides nicely inside dural, bottom filled with garden split cane to stop it bending sharply over the dural end) very floppy and needs bracing to take sideways wire tension. The central join in the 1.5in TV pole is a 2ft length of 1.25in steel handrail.  The bits were "to hand" :-)) It currently needs reguying since storms blew tree branches into the guys. Also 60 ft trees have spead across the wire run :-((.
 
Alan 
G3NYK
----- Original Message -----
Sent: Monday, September 10, 2012 5:54 PM
Subject: LF: Antenna mast

Graham

 

I understand your surprise at 60ft with scaffold poles! In fact Mark1 was a disaster with single poles and joints ? all bendy in the middle and no chance of getting it vertical ? if you see what I mean!!

 

Mark2 is a different design combination steel and alloy. I?ll let you know if it works and post some photos. At the moment all is going to plan apart from the Welsh weather.

 

73 Terry

 

From: [email protected] [mailto:[email protected]] On Behalf Of Graham
Sent: 10 September 2012 16:45
To: [email protected]
Subject: Re: LF: RE: Re: Re: Decca NDB on EBay

 

60 ft  !  I have   2  x 20 alloy as  insulated  mast , with  saddle  joints  , you  using  steel or alloy ?

 

G.

 

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