Original article from: Wayne Sarosi
Reposted by Rob Dennis,Moderator HAM_TECH,for use of the FIDO HAM_TECH echo.
THIS POST/SERIES NOT TO BE USED IN ANY CDROM COMPILATIONS FOR COMMERCIAL
SALE WITHOUT EXPRESS WRITTEN PERMISSION OF ORIGINAL AUTHOR(S) OF THIS POST.
ALL AND ANY COPYRIGHTS RETAINED BY AUTHOR(S).
SUBJECT: Towers,part two
Towers are an interesting subject where antennas are concerned.
We have the commercial types which can cost you a bundle.
Then there are the cheap-o second (fifth) hand towers older than most hams,
that we buy which,at best,offer a shakey support if not reworked properly.
Antenna supports come in various flavors from trees,to push-up masts,to full
blown,motorized,telescoping,hundred footers capable of leaping tall buildings
in a single bound. All are good depending on what you use them for.
A tower rated for 10 sq.ft windload should be adhered to order to save your
equipment. An antenna and rotor system mounted on top of a a tower can put a
heavy torque (twisting action) on the tower. Some towers and masts can't
ake
that torque and they crumble.
There are ways to by-pass that problem and they will be discussed later.
Guy lines can be a pain in the butt also.
Metal guys can play havoc with various bands and ropes stretch.
These will be looked into also.
I reposted my first tower article based on some problems I have had here.
I won't be able to cover everything but I have a few friends that have some
interesting towers that I will share with you.
AREAS TO BE COVERED:
o Trees
o Wooden towers
o Push-up masts
o Tubular towers
o Small Steel Crank-ups (7 & 9-in tri-angulars)
o Rohns
o Commercial Grade
o Monster Crank-ups
o Roof mounts
o Tilt-overs
o Trouble spots
-WS
--- GoldED 2.42.G1219
---------------
* Origin: VE3SJN....Moderator....HAM_TECH (1:163/506.4)
|