[TowerTalk] Ground Level Rotators

Sun Sep 8 12:41:06 EDT 2013

I love the pipe mast and cable suspension.
Repurposing is FAR more fun than buying.
Did you know that the wooden flanges from RG6 thousand foot spools are an 
EXACT fit in 25G tower?
Heavily oiled, they should last several years.
Bore out the center hole to fit your mast.
Heck, the plywood is even easy on galvanizing!

AND, the threaded neck of some large plastic jugs is the perfect diameter 
and thickness to make a sleeve bearing for 1.5" EMT in a 2" top section 
tube!

Don't forget the CX contest 9/15 and 9/22.  See classicexchange.org

Wilson
W4BOH

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From: towertalk-request at contesting.com
Sent: Sunday, September 08, 2013 12:00 PM
To: towertalk at contesting.com
Subject: TowerTalk Digest, Vol 129, Issue 19

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Today's Topics:

   1. Re: Ground level rotator mounting (scottw3tx at verizon.net)
   2. Re: 1st list of Heliax stuff (Pete M)

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Message: 1
Date: Sat, 07 Sep 2013 21:03:13 -0400
From: "scottw3tx at verizon.net" <scottw3tx at verizon.net>
To: Jim Hargrave <w5ifp at gvtc.com>
Cc: "<towertalk at contesting.com>" <towertalk at contesting.com>
Subject: Re: [TowerTalk] Ground level rotator mounting
Message-ID: <D36F508D-07D3-4F94-BA1C-2A00BD9D4E4D at verizon.net>
Content-Type: text/plain; charset=us-ascii

ON4UN has an excellent description of placing a rotor at ground level, with 
a full height transmission shaft, in one of the earlier editions of Low Band 
DXing.

Best regards,
Scott

On Sep 7, 2013, at 6:58 PM, "Jim Hargrave" <w5ifp at gvtc.com> wrote:

Doug,

i have a homebrewed kludge.

I have a Prop Pitch rotor mounted about 4 ft from the bottom of my 50Ft.
tower.
On the top is a TH6 about 4 ft above the tip of the tower.
10 ft above that is a 14 el 2m beam. Then 2 ft above that is a 144/220/440
J=Pole.
All above the tower rotates together.

My mast is made with sections of 1 1/2" Galvanized water pipe.
In my case, I installed/assembled the mast as I raised the tower.
After assembly I drilled each coupling and installed two 1/4" bolts to keep
the
threads from coming loose.

This is a very heavy setup. I have suspended the mast with steel cable
attached
near the bottom and about 20ft up the tower. I adjust the height with a
turnbuckle
until there is no weight on the rotor in the mid rotation. As it rotates it
actually
lifts the assembly slightly so the rotor never feels any weight through
the entire rotation.

I installed two Phenolic retaining plates (@20 & 40 ft) to keep the mast
centered.
These are about 6 in square with holes cut in the center and mounted with
angle
iron between tower legs. These are loose fit, nothing scientific.

This setup has been in continuous operation at this QTH since 1997.

   73s de Jim
      W5IFP

> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com]On Behalf Of
> Doug Wetzel
> Sent: Friday, September 06, 2013 8:39 PM
> To: towertalk at contesting.com
> Subject: [TowerTalk] Ground level rotator mounting
>
>
> When I put up my HDBX-48 in the spring, I'm thinking of mounting the
> rotator at ground level.  Has anyone on the list done something similar?
> What did you use for mast all the way up the tower, and did you use
> multiple thrust bearings to align the mast?
>
> Thanks in advance.
>
> Doug
> K7IP
> _______________________________________________
>
>
>
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> TowerTalk mailing list
> TowerTalk at contesting.com
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Message: 2
Date: Sun, 08 Sep 2013 09:18:04 -0400
From: Pete M <pmanfre at gmail.com>
To: TowerTalk at contesting.com, Moon-net <moon-net at googlegroups.com>,
Test Equip Trader <TestEquipTrader at yahoogroups.com>
Subject: Re: [TowerTalk] 1st list of Heliax stuff
Message-ID: <522C790C.2030207 at gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

10 Pieces Andrew L7PNM 1 5/8 " N male premium connector for LDF7-50 $9
each Will ship priority mail or FedEx. ( at cost of shipping)

20 pieces Commscope 1873ADM 1 5/8" DIN Male HELIAX Connector $4 each +
Shipping easily adapted to LDF7 ( remove teflon sleeve from connector)

20 Pieces Andrew L2PNM-HC Heliax connectors, for 3/8 inch cable New in
boxes.  $2.50 each + Shipping

5 Pieces Andrew V7PDM-RPC Heliax connectors, for  VXL7 Heliax $9 each +
Shipping

5 Pieces Andrew L6PDF-RPC Heliax connectors, for  1 1/4 Heliax $7 each +
Shipping

20 Pieces Andrew L6PDM-RPC Heliax connectors, for  1 1/4 Heliax $7 each
+ Shipping

10 pieces RFS LCF-12-50-7 1/2 inch heliax DIN FM connector fits Cellwave
LCF12-50 and will fit LDF4 also. $3 each + Shipping

6 Pieces 7/8 clamp on ground kit  $2.50 each + Shipping

50 pieces Andrew SGL2-06B2 2 1/4 clamp ground kit ...EASILY usable on
all sizes, $3.50 each + Shipping

2 weeks for these.  If not sold I will not list any more of these items,
even if I run into more. Please do not ask for this in the future,
After this week off to scrap barrel ... sorry.  I will not sell anything
unless posted here.  I will search special for a $1000 fee ...J , in
other words I really do not want to because it is all disorganized....as
I sort I post.

Next week I will post different items

Thanks for looking,
Pete WA2ODO
Deputy Sheriff, LACOSO

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