[TowerTalk] AN Wireless HD tower installation advice needed

David Gilbert xdavid at cis-broadband.com
Sun Sep 16 13:57:37 EDT 2012


Here is how (pictures and description) I installed my HD70 tower, 
starting with the hole for the foundation.   Most of what you asked 
about is shown on pages 4 and 5, but if you are assembling the tower 
yourself the entire series of pages may be useful to you.

http://ab7e.com/AB7E_Tower_Page_1.html

I used Cadweld molds that I found on eBay to connect the ground wires to 
the rebar, to connect the rebar to each other, and to connect the wires 
to the tower base inside the foundation, but to be honest some of that 
was probably overkill.  My website doesn't show a picture of it, but my 
ground wires also connect to each leg of the tower itself above the 
foundation (which I did partly to be able to show later that the tower 
was actually grounded), and for that I used half of a galvanized pipe 
ground clamp (also bought at Home Depot).  I drilled two holes through 
the tower leg and bolted the half with the wire connection to the tower, 
and after I tightened down the screw for the wire I sprayed everything 
with galvanizing paint.  I'm pretty sure that same method would work for 
the wires that connect the rebar cage to the tower base inside the 
foundation instead of using a wire-to-plate cadweld mold like I did.   I 
can take a picture and send it to you if my description here wasn't clear.

Here is how I grounded my coax at the top and bottom of the tower. I 
bought the angle stock with holes in it from Home Depot and reamed out 
the holes to fit 2 inch long nickle-plated SO-239 barrel connectors.  
The picture shows the bracket at the bottom of the tower, but there is 
also one at the top.

http://ab7e.com/AB7E_Antenna_Page_4.html

The picture at the bottom of the page shows the bracket at the bottom of 
the tower, but there is also an identical bracket at the top.  In fact, 
I also put a smaller but similar bracket on each boom-to-mast plate in 
order to make it easier to disconnect the antennas since the coax 
attachments are pretty far out on the booms.  You can see a picture of 
that on page 2.

Lastly, I connected a 4/0 stranded wire between the mast and the top of 
the tower (wrapped a couple of times around the mast to allow for 
turning) because I didn't want to trust the top "thrust bearing" 
(actually a bearing for lateral mast load) to keep lightning strikes 
away from my rotator.

You will LOVE your HD60.  I get monstrous wind gusts at my QTH on the 
southern end of the Huachuca Mountains here in southern Arizona, 
especially in the spring when the thermals are active.  I've measured 
clear sky wind gusts in excess of 95 mph, and 70 mph and 80 mph happen 
several times almost every day in April and May.  The tower with two 
fairly large antennas (Optibeam OB16-3 and OB2-40) has held up 
beautifully and I have a hard time seeing any deflection in such winds 
when I stand at the base and look upwards.  I'm actually afraid of 
heights, but I've been at the top of my tower when 50 and 60 mph gusts 
have hit it and can barely feel the sway. I've always felt secure up 
there, although wearing a full body harness and being clamped in with 
three different straps definitely helps that.   ;)   Your HD60 is of 
course even stronger than my HD70.

Don't hesitate to ask if you have more questions.

73,
Dave   AB7E






On 9/16/2012 5:50 AM, Mat Eshpeter wrote:
> I will be ordering an HD60 from AN Wireless on Monday for my windy and lightning-prone ridge top WV location and have some questions regarding installation:
>
> 1. It looks like the preferred way to support the base prior to concrete is to rest the base on cinder blocks. Are there other tricks needed to keep the base level and immobile during the actual concrete pour? Perhaps I need to use rebar ties to fasten the tower base to the rebar cage? I am paranoid about having the base shift during the pour and creating a "leaning tower of Pisa" in my yard.
>
> 2. How did you run your feedline up the tower -- are there suitable clamps available? The profile of the legs looks makes me think some ingenuity will be needed.
>
> 3.  Grounding coax at top of tower - Same tower leg profile challenge. I have only found products that are suitable for tubular shaped tower legs. So how do you securely bond the shield to the tower leg of an AN Wireless tower? Example: http://www.dxengineering.com/parts/dxe-cgb-150
>
> 4. Grounding base of tower to ground field - I have 2/0 solid copper that I need to connect to the tower legs at the base. Same tower leg profile challenge. The tower is galvanized so I need some sort of stainless steel plate to separate the galvanized tower from the copper; and I need to figure out how to make a solid connection of the ground wire to the tower legs. I have no idea how to make this connection.
>
> Thanks for any advice.MatKK1C 		 	   		
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