I would still build the rebar cage with or without the base section.
On 9/16/2011 7:47 AM, Larry wrote:
> The Rohn 45G brochure shows a round base 2'6" in diameter, 4 feet in the
> ground,
> with 6" above ground, with pier pin for towers up to 150' at 110mph wind.
> Same
> base is OK for up to 200' at lower wind speed. The base has 8 #7 vertical
> rebar
> in a circle plus some #4 rebar rings (1 cu yd of concrete). This all depends
> on soil
> conditions, local codes, etc of course.
>
> The brochure also says one could make a square base 2'6" on a side. No
> mention
> of using the short base in concrete and how it might affect the rebar
> schedule.
>
> I have a square base on my 100 foot 45G with concrete ending slightly above
> the
> bottom of the legs in gravel on a short base. It has made it through a
> couple of hurricanes
> and a tornado so far without problems.
>
> 73, Larry W6NWS
> ----- Original Message -----
> From: "Stan Stockton"<stan@aqity.com>
> To:<towertalk@contesting.com>;<starrose444@aol.com>
> Sent: Thursday, September 15, 2011 9:08 AM
> Subject: Re: [TowerTalk] 45g Tower
>
>
>> Bob,
>>
>> All this is just opinion:
>>
>> I suggest that you consider putting up one tower and making it about 85
>> feet tall. There would be four fewer holes to dig, fill with anchors,
>> concrete, etc. You would only need two sets of guy wires (same as what
>> you were planning except all on one tower) and whatever you will put up
>> will be overall better at that height than at 35 feet. You would have
>> the option of antennas at lower heights either fixed in one direction or
>> rotating with a side arm.
>>
>> Unless you are on top of a hill with a steep drop off near the tower,
>> where an antenna may actually work better at 40 feet than at 80 feet,
>> the elevation above sea level makes little difference except for its
>> relation to surrounding area and line of sight communications. In other
>> words someone on a little 100 foot hill surrounded by sea level is in a
>> much better location than someone on flat land for miles in every
>> direction at 2000 feet elevation.
>>
>> As far as the base is concerned I think 5 feet deep is way overkill.
>> For a guyed tower, all you are trying to do is keep the thing from
>> sinking. Check the source who said 5 feet is needed and see what they
>> say about 3 feet versus 5 feet.
>>
>> Stan, K5GO
>>
>>
>> ----- Original Message -----
>> From:<starrose444@aol.com>
>> To:<towertalk@contesting.com>
>> Sent: Wednesday, September 14, 2011 6:05 PM
>> Subject: [TowerTalk] 45g Tower
>>
>>
>>> Again thanks for all the information about using a mid section for a
>>> base.This is my first tower so I want to do it right.I have 8 10ft 45g
>>> sections and one 45ag top section would like to make two towers.Each
>>> tower will only be about 35-45 feet in height I am elevated at 1100
>>> feet now on a very large farm.I was told the hole should be about 3x3
>>> and 5 feet deep.They will not be aginst the house so I have two sets
>>> of guy wires Iam thinking a set on each?Any information like how much
>>> gravel in the hole grounding etc.
>>>
>>>
>>>
>>>
>>>
>>> Thanks
>>> Bob
>>> Kc8phb
>>> _______________________________________________
>>>
>>>
>>>
>>> _______________________________________________
>>> TowerTalk mailing list
>>> TowerTalk@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/towertalk
>> _______________________________________________
>>
>>
>>
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>
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--
J6/W0MU November 21 - December 1 2011 CQ WW DX CW
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