Burying everything from the pole to the building. The only copper going
up the tower will be Cat 6. I doubt those big copper cables used for
ham antenna would last more than a few days.
On 02/19/2012 12:29 PM, Stan Labinsky Jr. wrote:
> Given the neighborhood you mentioned, one thing comes to mind... copper
> thieves.
>
> Are you making provision for that possibility? Like keeping a box of snakes
> on the roof of your block shed?
>
> Stan
>
> ----- Original Message -----
> From: "Bruce Ward"<Bruce@IPIntel.com>
> To:<towertalk@contesting.com>
> Sent: Sunday, February 19, 2012 12:56 PM
> Subject: Re: [TowerTalk] Request for Advice - Rohn 25 vs TRI-EX HZN 471
>
>
>> I have another friend who is a tower climber. He is has installed 60'
>> freestanding Rohn 25Gs and is comfortable climbing them. I am not
>> comfortable with him doing so.
>>
>> If I go with the Rohn 25G I will use boom truck to install the steel
>> structure (I beam, tubing, pipe, etc approved by engineer). Then the
>> tower can be installed by the climber as a normal bracketed tower. The
>> tower would not extend more than 40' above the top bracket point.
>>
>> With the TRI-EX he the boom truck would be used to install the tower.
>>
>> If the tower were to fall over in a storm it would fall into a wooded
>> area without damaging any structures. I really want to avoid this
>> scenario so I am investing in the bracketing.
>>
>> I am in a county, outside the city, that does not have zoning or code
>> issues. Although I do not want to build anything that would not pass
>> code inspection.
>>
>> I am fairly sure my boom truck operator would not allow any riding of
>> the ball. He was very careful while installing the trusses for my house.
>>
>>
>>
>>
>>
>>
>>
>> On 02/18/2012 09:53 PM, K8RI wrote:
>>> On 2/18/2012 8:58 PM, Gary K9GS wrote:
>>>> Seems like an awful lot of trouble when you can just buy an extra
>>>> section or two of used Rohn 25.
>>> Remember he can't guy it.
>>> Another problem is standing up this much tower, let along it being
>>> unguyed, and having to service it.
>>> No way would I consider climbing that much free standing 25G. So it'd
>>> have to go up with the coax and antennas in place.
>>> In "the old days" we would have had a crane lift it in place and either
>>> ride the tower up or climb it while the crane still held onto it. Either
>>> way meant "riding the ball" down, or rigging a release we could pull
>>> from the ground which with only 60 to 80 feet is not much of a problem.
>>>
>>> You can use heavy I-Beam with bracing at the bottom welded in place. I
>>> believe they come in 24' lengths like most structural steel. One 12
>>> incher might cost as much or more than your 60 foot 25 G.
>>>
>>> Another question is what happens if the tower goes over in a storm? Are
>>> there any zoning restrictions? How will you prevent people from climbing
>>> it?
>>>
>>> Twas 30 plus years ago we had a problem at work that was one of those
>>> "how do we get some one up there and back down". I suggested the crane.
>>> To say that was unacceptable would be a vast exaggeration. Even the
>>> suggestion was considered unacceptable.<:-))
>>> I always thought "riding the ball" was fun. Once in a while though
>>> you'd find a lot of grease on that sucker just to make things
>>> interesting.<:-))
>>>
>>> Amazing as many of us made "old age" as did.
>>>
>>> 73
>>>
>>> Roger (K8RI)
>>>
>>>
>>>> Just saying......
>>>>
>>>>
>>>>
>>>> On 2/18/2012 6:33 PM, Bruce Ward wrote:
>>>>> Mark,
>>>>>
>>>>> You make a very sane suggestion.
>>>>>
>>>>> My reason for putting the tower on top of the building, if I do, is to
>>>>> get an extra 8' to 10' of height. The building will be sufficient to
>>>>> handle the 1100 pound weight plus the horizontal wind loads.
>>>>>
>>>>> The tower site is covered in 60' plus trees and there is a similar
>>>>> height hill with similar height trees between my tower and the far end.
>>>>> I need to get above the trees plus above the fresnel zone so I want to
>>>>> go as high as I can.
>>>>>
>>>>> If I use the Rohn 25G we will add sections until we are high enough.
>>>>> This method could mean that I have to build sufficient structure to
>>>>> bracket even higher than 35'. I would place the bottom section Rohn
>>>>> 25G
>>>>> on the ground (a concrete base) and bracket it to a pole embedded into
>>>>> the building.
>>>>>
>>>>> If I use the the TRI-EX I am stuck with its 70' height plus a 10' mast.
>>>>> Since it is a one shot deal I would like to start as high as I can.
>>>>>
>>>>> Thank you.
>>>>>
>>>>> On 02/18/2012 06:19 PM, Mark Robinson wrote:
>>>>>> I am not a mechanical engineer but why don't you put the tower in the
>>>>>> ground
>>>>>> and the building next to the tower.
>>>>>>
>>>>>>
>>>>>> Mark N1UK
>>>>>>
>>>>>>
>>>>>> ----- Original Message -----
>>>>>> From: "Bruce Ward"<Bruce@IPIntel.com>
>>>>>> To:<towertalk@contesting.com>
>>>>>> Sent: Saturday, 18 February, 2012 6:53 PM
>>>>>> Subject: [TowerTalk] Request for Advice - Rohn 25 vs TRI-EX HZN 471
>>>>>>
>>>>>>
>>>>>>> I am setting up a tower (my first) to get internet service. The
>>>>>>> antennas will be less than 2 square feet of wind loading combined and
>>>>>>> could be even less using 2 11x14" grid antennas.
>>>>>>>
>>>>>>> My plan is to build a 10'x10' 9' to 10' tall block building on a slab
>>>>>>> that is larger in all directions. This building will will have a
>>>>>>> concrete roof with rebar and wire in all concrete. The blocks will
>>>>>>> have
>>>>>>> rebar and concrete in every cell. The structure will use 12 to 15
>>>>>>> yards of concrete plus 400 concrete blocks providing an over 45,000
>>>>>>> pound base for the tower. I have a civil engineer friend who will be
>>>>>>> involved in the final design of the building. The building is dual
>>>>>>> purpose, it will provide a secure home for my servers and a stable
>>>>>>> base
>>>>>>> for the tower.
>>>>>>>
>>>>>>> Now for the difficult part, I do not have room for guy wires.
>>>>>>>
>>>>>>> I am trying to decide between two options
>>>>>>>
>>>>>>> 1. I have 9 full and a top section of Rohn 25G in my yard waiting to
>>>>>>> be
>>>>>>> be installed. Currently Rohn rates the 25G for freestanding use up
>>>>>>> to
>>>>>>> 40' with 1.4 square feet of wind loading. From reading online it
>>>>>>> sounds
>>>>>>> like Rohn 25s have been used for decades even higher without guy
>>>>>>> wires.
>>>>>>> I do not want to risk stretching beyond Rohns specifications. I have
>>>>>>> access to 40' lengths of 8" pipe. If I go with the Rohn 25G my
>>>>>>> intention
>>>>>>> would be to embed a 40' section of the 8" pipe into the building and
>>>>>>> bracket to that pipe up to 35' or so then have the tower extend
>>>>>>> another
>>>>>>> 35' to 40' above the pipe. All the metal would be isolated from the
>>>>>>> ground and properly guided with a ground rod to avoid corrosion
>>>>>>> issues.
>>>>>>>
>>>>>>> 2. There is a TRI-EX HZN 471 available locally. I would have jumped
>>>>>>> on
>>>>>>> this one earlier but it is worth more the the current owner than it
>>>>>>> is
>>>>>>> to me. This is a 70' (71'?) crank up tower with a motorized winch.
>>>>>>> The
>>>>>>> motor is broken and would need to be replaced. The tower is free
>>>>>>> standing with the exception of three diagonal pipe braces that
>>>>>>> connect
>>>>>>> from the top of the bottom of the 4 sections to the ground around 10'
>>>>>>> out. I like that this tower is freestanding and I believe I could do
>>>>>>> away with the braces if I bracketed the tower at the same location to
>>>>>>> a
>>>>>>> sufficiently strong structure. If I used this tower I would likely
>>>>>>> build a 3'x3' column of solid concrete into my building and place the
>>>>>>> tower on top.
>>>>>>>
>>>>>>> I would very much appreciate any suggestions and advice.
>>>>>>>
>>>>>>> Thank you.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>> _______________________________________________
>>
>>
>>
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