[TowerTalk] Mobile Tri-ex 70 tower

[jimlux]

On 7/13/18 6:11 AM, W0MU Mike Fatchett wrote:
> The problem with the trailer is that it should be "guyed" in three 
> directions 50 ft from the front and the outriggers.  I have not found 
> the original owners manual so I am not completely sure how effective the 
> guys really are.  I found a great manual online that a club put together 
> for their Field Day ops.  They drive rebar in the ground with a washer 
> welded at the end for the tie offs.
> 

Speaking cynically, I think those "stakes in the ground" are more to 
provide a secure anchor point for the guyline so that it holds up when 
someone trips over it in the dark. And to mark the approximate "fall 
radius" for the tower, so you can make sure you don't set up an 
operating tent within that radius.

I doubt they have any signifcant pull-out strength, so if the wind comes 
up, the stake will bend, pull out, and over the tower goes.


*real* temporary installations designed to withstand significant wind 
(or seismic) loads will use auger screw anchors, or these days, I've 
seen a lot of use of "big blocks of concrete" or K-rail/jersey barrier. 
The truck drives up with the rented weights, a crane or forklift puts 
them in position, and you're done.  The purpose designed weights are 
about 5000 pounds, with a big steel loop on the top to attach a guy to. 
They're roughly a cubic yard in size.

You could probably also use FIBC (Flexible Intermediate Bulk Carrier) 
bags full of gravel as weights.  They are also in the 5000 pound range.

They're surprisingly inexpensive to rent - $5/day kind of numbers.  It's 
the delivery cost that might be pricey.



> W0MU
> 
> 
> On 7/12/2018 8:15 PM, john at kk9a.com wrote:
>> With all of the HOAs, I'm guessing that this would be more valuable on 
>> the
>> trailer.
>>
>>
>> John KK9A
>>
>> To:    towertalk at contesting.com
>> Subject:    [TowerTalk] Mobile Tri-ex 70 tower
>> From:    W0MU Mike Fatchett <w0mu at w0mu.com>
>> Date:    Thu, 12 Jul 2018 18:08:20 -0600
>>
>> Can you remove the tower from the trailer and mount these on a concrete
>> base?
>>
>> W0MU
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk at contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
> 
> _______________________________________________
> 
> 
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk