Ron: I am currently in the process of putting up a U.S. Tower MA-850 with
the rotor base and will be putting a 3 element SteppIR with the 40/30
modification on top. At a 70 mph wind and the tower fully erected, I will
surely be in an overload condition if there is no margin in the specifications.
I went through a lot of consideration, emails, and conversation before I
selected this tower because of the 70 mph wind load limitations.
I think that you will find that the tower companies will be very reluctant
to talk about margin and overload. I tried, several times, and was NOT able to
get that information. If anyone has that information, I would sure like to get
it.
My solution? I bought the fully motorized tower. I plan to keep it
retracted unless I am operating. While I was not able to get actual wind load
numbers for the retracted tower, I am lead to believe that it is much, much
higher than the SteppIR will present, maybe by a factor 5 or more.
Good luck getting your tower up.
73s,
Bernard, WA4OEJ
----- Original Message -----
From: w4lde
To: TowerTalk ; SteppIR Yahoo Group
Sent: Sunday, June 22, 2008 10:39 AM
Subject: [SteppIR] Advice on Tower
I recently have moved to a new home, SW of Atlanta and have a SteppIR
3-element with the 30/40 add on sitting in the garage waiting on a new
tower.
I have approval from the HOA and County to erect a Tower, home deed was
filed with modifications to allow a ham radio tower and antennas.
Although no specific restrictions on height or style are place on me by
the HOA or the deed modifications, when I started the process
I thought a US Tower MARB-550 would look very neighbor friendly and be
easy to get buy in's by all.
I already have a base for the tower in-place but I am a little concerned
as to the ratings for the MARB when comparing a TX-455 style.
My Counties wind rating is 70MPH, we have already seen 50MPH gusts
during a thunderstorm recently.
The tower is rated at 9 sq/ft at 70 MPH and 61#'s weight, the specified
wind load by SteppIR is 8.1 sq/ft. at 58#'s I would elect to use the
rotating n base thus keeping the rotor at the bottom of the tower and
reducing the extra weight and little load.
Now the questions?
1. Since I am almost right on top of the spec's, wind load and weight,
should I abandon this Tower selection.
a. As it now stands I have a 3'-6" x 3'- 6" x 6" concrete base with
rebar and mounting bolts per the US tower spec's
2. Is there a way to adapt any type of rotating guy device to this
type of tower?
3. I would also like to hear from SteppIR - US Tower users with similar
setups.
Plans are to erect the Tower some time in mid September or early October
depending on deliver time so I need to get the order underway.
Maybe I can improve on the ratings by not keeping the Tower raised to
the maximum height unless I am chasing some DX expedition or am I dreaming?
73's de
Ron W4LDE
__._,_.___
Messages in this topic (1) Reply (via web post) | Start a new topic
Messages | Files | Photos | Members
MARKETPLACE
------------------------------------------------------------------------------
Special offer for Yahoo! Groups from Blockbuster! Get a free 1-month trial
with no late fees or due dates.
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch format to
Traditional
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe Recent Activity
a.. 12New Members
b.. 17New Photos
Visit Your Group
Biz Resources
Y! Small Business
Articles, tools,
forms, and more.
Yahoo! Groups
Stay healthy
and discover other
people who can help.
Autos Group
on Yahoo! Groups
Discuss ways to
fix your car.
.
__,_._,___
E-mail message checked by Spyware Doctor (5.5.1.322)
Database version: 5.10080e
http://www.pctools.com/spyware-doctor/
E-mail message checked by Spyware Doctor (5.5.1.322)
Database version: 5.10090e
http://www.pctools.com/en/spyware-doctor/
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|