[UK-CONTEST] Aerial Mounting?

[Cooper, Stewart]

I have a Force 12 20m 4 ele yagi with riveted elements. I break up the boom into sections with the elements already attached at the appropriate places and progressively winch up the tower as I attach the boom sections. This does require a little ingenuity when it comes to attaching the truss - but basically it too is progressively attached. On my Trident 15m beam one side of the elements are not riveted and I do what Chris and Dave suggest and add the tapering element bits as the tower is raised, but on 15m it's easier of course, 'cos de elements is shorta.
Either way, I would strongly advise against any sort of swivelling arrangement at the mast head. Use as big a clamp as you can find/make. Even the patented Force 12 EZ-Klamp or whatever it's called (boom to mast clamp) is a waste of time. I have a broken one to prove that.
73
Stewart
GM4AFF
 
Stewart Cooper
Maintenance Systems Engineer

ODL
Buchanan House  Summer Street  Aberdeen  UK  AB10 1SJ

Tel (Direct) +44 (0)1224 628039
Tel (S'board) +44 (0)1224 628000
Fax +44 (0)1224 643325


________________________________

From: uk-contest-bounces at contesting.com on behalf of Chris Tran GM3WOJ
Sent: Fri 16/05/2008 18:02
To: Tony Bettley; uk-contest at contesting.com
Subject: Re: [UK-CONTEST] Aerial Mounting?



Hi Tony

I have two HyGain 205CAS antennas here - by far the easiest method of
installation is to mount the boom on the stub-mast, with the boom parallel
to the ground i.e. horizontal, with the boom at a convenient working height
e.g 5'.   Mount the boom to element clamps on the boom.

The upper halves of each of the 5 elements are fully assembled and mounted
on the upper side of the boom, along with the bracing wire, coax + balun -
then the tower is progressively tilted upwards, adding the lower half
elements in sections, tightening each section as you go.

Eventually the antenna is fully assembled, with the tower still tilted over
at about 45 degrees.

Don't waste time/money on any sort of swivelling clamp system - the above
method is well proven with all yagi antennas where the elements can be
broken down into short sections - rivetted antennas like Force12 are another
matter.

73
Chris
GM3WOJ

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