Re: [Repeater-Builder] Re: Aluminium ladders as towers

[Ian Wells]

thanks for the thoughts .Does anyone know of some good pages on cheap masts or tower construction around 5-9 meters Thank you Ian Wells Kerinvale Comaudio mail service 1017, Biloela,4715. www.kerinvalecomaudio.com.au Mike Perryman K5JMP wrote: Ian, In my part of the world a good aluminum ladder costs about twice what a section of Rohn 25G costs... I think I would go with the 25G just for safety and strength, not to mention that your insurance agent would have a fit.. Mike -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Chuck Kelsey Sent: Sunday, August 21, 2005 3:39 PM To: [EMAIL PROTECTED] Subject: Re: [Repeater-Builder] Re: Aluminium ladders as towers I agree. There is not very good lateral strength in a ladder because there is no diagonal bracing like most towers have. You need to think "triangles." If it creates a triangle, in all planes, it's going to have strength. The old "Dill" towers with horizontal "steps" had no sideways strength. Today's Rohn has "Z" braces to form triangles. Chuck WB2EDV ----- Original Message ----- From: "Coy Hilton" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, August 21, 2005 3:10 PM Subject: [Repeater-Builder] Re: Aluminium ladders as towers --- In [EMAIL PROTECTED], "Coy Hilton" <[EMAIL PROTECTED]> wrote: One addition, this is a single aluminum ladder. Well, This was shown in the 2000 ARRL hand book...sorry to say. This is a single aluminum ladder. It works fine for field day operation the photo shows an exstention ladder guyed at three points sitting in a hole dug about a foot deep to keep it from walking off in the wind. I can see this being done for a temperary setup but to use it as a commertial installation is shurely dangerous. Good luck Ian AC0Y --- In [EMAIL PROTECTED], Ian Wells <[EMAIL PROTECTED]> wrote: Hi guys .I have heard of a communication business here in australia useing ladders as towers .anyone tried this or know of any webpages They must either join two together with braces or four of to form a square which forms a free standing tower Thank you Ian Wells Kerinvale Comaudio mail service 1017, Biloela,4715. www.kerinvalecomaudio.com.au Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/ YAHOO! GROUPS LINKS  Visit your group "Repeater-Builder" on the web.    To unsubscribe from this group, send an email to:  [EMAIL PROTECTED]    Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.