[NLRS] How high can I go?

[Clare Jarvis]

Thanks for the advise.  


Clare
   


On Monday 21 March 2011 13:21:51 Dr. Gerald N. Johnson wrote:
> I'll be talking about stacking distances at Aurora in a couple months.
> Like Kent Britain has been campaigning, closer may work pretty well.
>
> Pipe threads are the weakest point of the pipe and prone to breaking
> with a bending load. Been there, done that, broke it.
>
> I'd go with a longer pipe (chain link fence top rail is well galvanized
> and not too weak) (chain link fence posts are sturdier in short lengths)
> and use long u-bolts to lap the extension. I did that for decades to
> hold a pair of RIW for 432 (19 elements each) above my mast.
>
> 73, Jerry, K0CQ
>
> On 3/21/2011 12:11 PM, Clare Jarvis wrote:
> > Matt, (KF0Q)
> >
> > I want to add a 222 MHz 8 or 11 element yagi to my vhf/uhf stack.  The
> > stacking distance is about 6 feel vertical and I do not have that much
> > space left.   Can I put a threaded  extension on top or do I need to buy
> > a longer galvanized pipe?   How long a pipe can I put on the 40 foot
> > tower with that thrust bearing?
>
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-- 
Mr. Clare Jarvis
President, Jarvis Computer Software
PO Box 1264
Winona, MN 5598707264

(507) 454-2575