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Re: [TowerTalk] Inverted V on a retractable tower

Subject: Re: [TowerTalk] Inverted V on a retractable tower
From: K8RI <>
Date: Sat, 06 Oct 2012 19:59:25 -0400
List-post: <">>
On 10/6/2012 4:44 PM, SPWoo wrote:
Hi Larry,

Thanks for the reply.  I get a lot of wind here and I'm afraid that the 
counterweight would swing in the wind and cause stress on the rope/wire.  I 
wonder if there's a device that would retract the wire on a reel.  Since I 
retract my tower after I'm done with each operating session I need an automatic 
device where I don't have to make a trip to the outside.  I do have one of 
those coax arm supports already on the mast.

My tower is also loaded to the max. so a rotatable dipole is out of the 
question.  My other options are to mount the apex at the top of the bottom 
tower section, or to shunt feed the tower for 80m.

A couple of things to think about when doing something like this. Because it's an Inverted-V letting the tower down does not mean you need to take up that much slack from the antenna.

You can use a block and tackle arrangement so the support rope enters the block and tackle. IE used the block and tackle backwards for a 2,3,o4 4:1 take up. You can use and really need to use a heavier counter weight for this approach.

Treating the counterweight separately it can be kept inside a pipe, Steel channel, square Aluminum or steel tube, or even wooden enclosure where it either hangs free or slides within the enclosure.

Take up reels: Instead of counter weights you can use spring loaded take up reels or even take up reels powered by weights, or actual powered take up reels that would activate when ever the tension was released by letting the tower down.

You can also use the stretchy rope from the anchor point out to the antenna ends.

OR you can use a combination of these approaches.

Let your imagination be your guide.

Ask others in the area. Some suggestions will be a bit impractical like the dual wishing wells, to outlandish, to actually useful.

Much of this would not work for me as my antennas are under several hundred pounds of tension to keep them at least some where near straight as the centers support close to 100 feet of LMR400 and relatively large current chokes consisting of 5 2.4" #32 cores with 5 or 6 turns of Davis BuryFlex(TM)

73 and good luck,

Roger (K8RI)

Best Regards,
Jonathan Woo
(970) 646-1711

  From: Larry Loen <>
To: SPWoo <>
Cc: "" <>
Sent: Saturday, October 6, 2012 1:58 PM
Subject: Re: [TowerTalk] Inverted V on a retractable tower

I have seen this very thing done.

Basically, you need some sort of extender (if you're talking about US Tower, 
they sell such a device) so that the summit of the inverted V clears the tower 

Then, you just need to have some sort of system at the ends of the antenna that 
amount to some fairly simple pulley system with weights to allow the wires to 
fall down when the tower is cranked over for service.

On a tower at W0IBM, I saw something like a commercial product that did this.  It was 
tubes of maybe 2 inches in diameter attached to courtyard walls (the tower was in a 
courtyard).  When the tower came down, the weight-and-rope at the end of the wire antenna 
retracted into the tubes well enough.  We could detach or keep the thing intact from the 
top of the "V" when we tilted it over.  I believe we typically detached it for 
service; the system was designed such that
the wire was simply "where it needed to be" when the tower was retracted (but 
not cranked over) so we could reattach it
after we cranked the tower back from horizontal to vertical.

At my forever under development new shack, I plan to do something similar with my US 
Tower retractable.  I have an old trick of putting conduit over rebar as a distant 
antenna support for simple wire antennas.  I'll probably resort to the same 
weight-and-pulley trick -- I may even settle for a simple "eye hook" instead of 
bothering with a pulley.

The nice thing about the rebar-covered-by-conduit is that while it is plenty 
stable, it is easy enough to simply lift the conduit off of the end of the 
rebar (the fit is tight, but not overly so). So, everything is serviceable.  
With my simpler scheme, the wire may end up on the ground, but most of it would 
be away from the tower and, I presume, easy to manage without kinking and 

If I discover I can manage 20 feet of conduit with my scheme, then it is more 
like the W0IBM installation, because it would be at about the same height as 
the retracted tower.

Larry Wo0Z

On Sat, Oct 6, 2012 at 11:29 AM, SPWoo <> wrote:

Hi All,

Does anyone know how to install an inverted V antenna for 80m on a retractable 
tower?  Is there anything that could be done to prevent the wires from laying 
on the ground when the tower is retracted?  Thank you and 73.

Best Regards,
Jonathan Woo
(970) 646-1711

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