[TowerTalk] Mixing Rohn 20G and 25G

[Scott Reed]

As a WISP owner, I will not speak for your WISP, but all of our antennas 
are less than 2 sq ft wind load. Most weigh less than 5 lbs, so a little 
more than some TV antennas.

On 7/1/2014 9:24 PM, Linux Mercedes wrote:
> Wayne,
>
> I'll primarily be using it for wireless internet. Unfortunately, the 
> tech at the WISP I spoke to was pretty vague about the wind load of 
> the antenna they'll be using, but he assured me it would be 'minimal' 
> and didn't think it would be that big of a concern.
>
> I won't be house bracketing this install, but it will be guyed at two 
> levels (what Rohn recommends for 50' of 25G).
>
> --Nathan
>
> On 07/01/2014 09:59 AM, Wayne Kline wrote:
>> I also have experience with 20-G and 25-G towers... @ my station my 
>> 2mter/450 MHZ  and one 6 meter beam
>>   5 element 14' boom  are on at 36ft. an consist of  3 sections of 
>> 20-G and a top of 25-G  AG3 ?   it's house bracketed @ 18 ft.
>> Been in place for 24 years  BUT  extremely light wind load.
>>
>> IMHO  @ HF  a C-3. TA33  or A3 would be the BIGGEST  .
>>
>> So my question to you is WHAT are you planning to adorn the tower with ?
>>
>> Wayne W3EA   . .
>>
>>
>>> Date: Tue, 1 Jul 2014 07:42:14 -0500
>>> From: kkbroadcastengineering at gmail.com
>>> CC: towertalk at contesting.com
>>> Subject: Re: [TowerTalk] Mixing Rohn 20G and 25G
>>>
>>> Nathan,
>>>
>>> I would caution you to not mix the sections nor even use the 20 for
>>> anything more than VERY light duty use.
>>>
>>> With that said...  Back in my younger days when I did a lot of tower 
>>> work
>>> for CB and Ham operators, there were a number of mixed 20/25 towers
>>> supporting large CB antennas and they stayed up many years.  I do 
>>> recall
>>> working on one where the 20 top section physically broke during a wind
>>> storm.
>>>
>>> Climbing a mixed 20/25 tower is a real pain as the steps are different
>>> distances apart.
>>>
>>> Good luck,
>>>
>>> Kevin C. Kidd, CSRE/AMD
>>> AM Ground Systems Company  -  WD4RAT
>>> kkidd at kkbc.com  --  866-22-RADIO -- 866-227-2346
>>> www.amgroundsystems.com
>>>
>>>
>>> On Mon, Jun 30, 2014 at 7:42 PM, Linux Mercedes 
>>> <linuxmercedes at gmail.com>
>>> wrote:
>>>
>>>> Hello,
>>>>
>>>> Whilst moving tower sections from the shed to the shop so I could 
>>>> clean
>>>> them up and make a couple of fixes before putting up my tower, I 
>>>> noticed
>>>> that some of them seemed lighter than others. Turns out I've got a 
>>>> mix of
>>>> 20G and 25G sections.
>>>>
>>>> What are your thoughts on putting up, say, 30 or 40 feet of 25G and 
>>>> then
>>>> another 20 or 10 feet of 20G? I'd like to use the best sections I 
>>>> have on
>>>> the tower, but if mixing is a no, then I'll fix up some of the other
>>>> sections I have and build a homogeneous tower.
>>>>
>>>> Thanks,
>>>> Nathan
>>>> _______________________________________________
>>>>
>>>>
>>>>
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-- 
Scott Reed
Owner
NewWays Networking, LLC
Wireless Networking
Network Design, Installation and Administration
Mikrotik Advanced Certified
www.nwwnet.net
(765) 855-1060  (765) 439-4253  Toll-free (855) 231-6239