[TowerTalk] Mast size

[Mike]

Thanks Mike. It did indeed have a bushing, long gone.
1.5" water pipe is 1.9" OD. I really need to replace the water pipe with 
tubing, so I was trying to verify that my top section isn't gonna work 
for that.

73 Mike NF4L

Mike Schelly wrote:
> Mike,
>
> Some Rohn 25AG top sections came with a knockout bushing at the very top to
> accommodate 1.5" water pipe when the CB craze was going on in the 70's.
> There were also a lot of 25G knockoff's manufactured across the
> country...here in Memphis
> most assuredly, the local fabricator shipped nationwide during that time
> period. 
> Look for a reducer bushing and remove it. Hope this helps.
>
> Mike K4EAR 
>
> -----Original Message-----
> From: towertalk-bounces at contesting.com
> [mailto:towertalk-bounces at contesting.com] On Behalf Of Mike
> Sent: Thursday, July 16, 2009 6:11 PM
> To: towertalk reflector
> Subject: Re: [TowerTalk] Mast size
>
> Nah. I don't climb.
> IF the section is 25AG, the catalog says 2" OD with 16 ga. walls. 16 ga. 
> is .0598" x 2 = .1196. 2-.1196 = 1.8804. The galvanizing takes up a couple
> of atoms thickness.
>
> Doesn't leave much.
>
> Mike
>
> Pete Smith wrote:
>   
>> My catalog is ancient - mid 90s.  So you've measured the tube?
>>
>> Pete
>>
>> On 7/16/2009 4:11 PM, Mike wrote:
>>     
>>> Hey Pete -
>>> True, but I don't think it's either of those. The tube doesn't extend 
>>> down as far as the AG2, and the AG3 has the extra brace about 1/3 of 
>>> the way up the slanty part.
>>> Page 29 in my catalog(2004 revised). Where'd you see the part about 
>>> the 2" mast?
>>>
>>> 73. Mike NF4L
>>>
>>> Pete Smith wrote:
>>>       
>>>> From my Rohn catalog, both the 25AG2 and 25AG3 have 2 1/4" OD tubes.  
>>>> The catalog says a 2" OD tube will fit snugly.
>>>>
>>>> 73, Pete
>>>>
>>>> On 7/16/2009 1:14 PM, Mike wrote:
>>>>         
>>>>> Would somebody look at the pic at http://nf4l.com/top.htm and 
>>>>> verify that's a 25AG section?
>>>>>
>>>>> I'm needing to replace the water pipe mast with something stronger 
>>>>> because I want to put a 6M yagi over the SteppIR.
>>>>>
>>>>> I work out the ID of the tube on the 25AG to be 1.88" (not 
>>>>> accounting for the galvanizing). Seems like the OD of the steel 
>>>>> tubing I see advertised is 1.9"
>>>>>
>>>>> What can I use, and where can I get it? I need 12-15 total length'
>>>>>
>>>>> 73, Mike NF4L
>>>>> _______________________________________________
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> TowerTalk mailing list
>>>>> TowerTalk at contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>>>>
>>>>>           
>>>       
>
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