[TowerTalk] 66-Foot Vertical (overlap of tubing)

[Roger (K8RI)]

Dick Williams wrote:
> <snip>
>
> So, all said and done, I think 3" overlap is enough to provide adequate 
> strength in the joint.
>
>   
Agreed although it does depend on the length of tubing beyond the joint 
plus the wind area.
I chose 1' arbitrarily as I like to be on the safe side. A number of the 
commercial antennas here use from about 3" to 8" (I'd have to measure to 
be sure...or find the manual)  One I'm thinking of is the AV640 which 
IIRC uses a fair amount at the base and little near the top.

73

Roger (K8RI)
> Dick K8ZTT
>
>
> ----- Original Message ----- 
> From: "Roger (K8RI)" <K8RI-on-TowerTalk at tm.net>
> To: "TowerTalk" <towertalk at contesting.com>
> Sent: Saturday, March 14, 2009 1:53 AM
> Subject: Re: [TowerTalk] DX Engineering 66-Foot Vertical?
>
>
>   
>> Oops...
>> <snip>
>>     
>>>  I can start with anything from 2 to 2 1/2 or 3". the sections
>>> should have a 1'. What do I need?  If need be I can take standard
>>>
>>>       
>> That should have said I should have close to a 1' overlap (+ 2 or 3" - 0)
>>     
>>> lengths, cut them and use the excess"  I was told they charge by the
>>> foot whether I use a full length or they cut it to length when I needed
>>> some a few years back, which was a surprise.
>>>
>>> "I think" which means I don't know for sure, that "standard lengths" are
>>> 6', 8', 10' and 12'
>>>
>>> That is what I'd give to the Aluminum shop in Saginaw.  True I could
>>> take any list of 6061 tubing and figure out what I need but the shop
>>> could do it in 10% of the time and for very little charge.
>>>
>>>       
>> 73
>>
>> Roger (K8RI)
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