[UK-CONTEST] Stub Masts

[Clive GM3POI]

Agreed John, that  is why I got my own head units made, as my third section
up my tower is the size of a bottom section of an HD P60; and is guyed at
all levels as per Versatower with 16mm dia Parafil ropes.  
All needed to do the job properly if you can ever get serious weather. 73
Clive GM3POI
-----Original Message-----
From: uk-contest-bounces at contesting.com
[mailto:uk-contest-bounces at contesting.com] On Behalf Of John Lemay
Sent: 03 March 2012 09:16
To: uk-contest at contesting.com
Subject: Re: [UK-CONTEST] Stub Masts

That's a serious stub mast !

A word of caution ...........

My Versatower spec sheet says head load capacity of an H1 head unit is 36kg
and an H2 head unit is 56kg.

John G4ZTR


-----Original Message-----
From: uk-contest-bounces at contesting.com
[mailto:uk-contest-bounces at contesting.com] On Behalf Of Clive GM3POI
Sent: 03 March 2012 08:43
To: 'David Aslin'; uk-contest at contesting.com
Subject: Re: [UK-CONTEST] Stub Masts

A good while ago I decided to use Chrome- Moly steel tube for my main stub
mast, it however was expensive, heavy but extremely strong.
It is 2" dia with a 0.5" wall thickness and weighs about 60kg. However it
has survived all sorts of weather including serious wind exceeding 125mph.
73 Clive GM3POI 

-----Original Message-----
From: uk-contest-bounces at contesting.com
[mailto:uk-contest-bounces at contesting.com] On Behalf Of David Aslin
Sent: 02 March 2012 11:32
To: uk-contest at contesting.com
Subject: Re: [UK-CONTEST] Stub Masts

If the stack is big enough, scaffold tube will bend.  See
http://www.arraysolutions.com/Products/antennamastapps.htm or W6NLs Yagi
book...

Aluminium Warehouse does some thick wall (3/8 or ½ inch)  2" and 2.5" OD
6082-T6 tube if you really want to use Al.

Just saying, since staying on the air is important!

73

David G3WGN

 

 

 

Ken,

 

I hope that you've made sure that the wall thickness of the stub mast is
sufficient for the loading. I made the mistake of using thin wall
(1/16"?)tubing (to keep the weight down) for the my stub mast which was
supporting a 2 ele tri-bander&  beams for 4, 2&  70 cm.

 

A few of winters ago it snapped in a gale leaving all the antennas dangling
on the feeders.

I replaced the lower half with 3/16" aluminium wall tubing, not much fun in
January when there aren't many hours of daylight&  it's cold outside.

 

Do scaffolding companies still use aluminium tubing or is it all steel these
days?

 

73...

 

Ken

 

G3LVP

 

Message: 7

Date: Fri, 2 Mar 2012 07:41:06 +0000

From: Ken Chandler<g0orh at sky.com>

Subject: [UK-CONTEST] Stub mast

To: uk-contest at contesting.com

Message-ID:<63F57664-8E04-466F-BE99-A080B5E19001 at sky.com>

Content-Type: text/plain;     charset=us-ascii

 

Thanks to everyone who responded, Re the stub mast help request.... Its
sorted!

 

Cheers

 

Regards

 

Ken..G0ORH / M3i

 

 

 

 

 

 

 

 

 

 

 

 

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