[SJDXA] FW: For sale - Tri-EX HZ-571N tower

[Bob Schenck N2OO]

I just got this, fyi to the group.

 

See ya' in the Pileups!

73!

Bob Schenck, N2OO

President SJDXA

GO SJDXA!!! www.sjdxa.org

 

From: William N. Goodman, CPA [mailto:wgoodman at goodmancpa.biz] 
Sent: Friday, December 10, 2010 8:07 PM
To: Gilbert Kauffman, K3CC
Subject: FW: For sale - Tri-EX HZ-571N tower

 

 

For sale – Tri-Ex HZ-571N tower

 

Do you want to be loud in DX pile-ups and contests?  I own a very rugged,
high quality, and impressive Tri-Ex HZ-571N tower that I want to sell.  It
cranks up to 71 feet extended, and collapses to 21 feet 6 inches.  You can
nest the tower sections and antennas during storms.  You can hide them
during the daylight from fussy neighbors and raise them at night, when the
neighbors are not looking!  The tower cranks up and down with an electric
motor remotely controlled from the ham shack.  The tower rotates on its base
using a prop pitch motor, chain, and sprocket, also remotely controlled from
the shack.  It is self-supporting with three steel bars that act as stiff
guys from the 21-foot level to the ground.  It may be tipped up or over
using a special fixture and winch.  

 

The plans are dated 12-23-59, Tulare, California.  It is in good condition,
resting horizontally on logs in my yard.  I removed it from a ham’s home
about 100 miles away, using a flat bed, roll back truck.  Bob Puharic, WF3H,
helped me dismantle and bring it home.

 

Tri-Ex is made no more.  The manufacturer was absorbed by Tashjian Towers
Corporation, which makes a similar tower now, their model LM-470.  I see no
difference between my Tri-Ex HZ-571N and the Tashjian LM-470.  Any
differences must be subtle.  I suggest you visit their website for details
on the LM-470, http://017cbac.netsolhost.com/crankup.html.

 

He had three HF yagis on it, a Hygain 204BA, Hygain 155BA, and Hygain 105BA.
He also had a couple of VHF and UHF yagis on the mast.  The 105 BA was
clamped to the mast.  The 155 BA was clamped to the side of the top section.
The 204BA was clamped to the side of the second tower section from the top.
I recommend that you do the same.  I can sell the Hygain yagis to you.  His
mast had steps in it.  You can probably buy a similar mast from Tashjian.
See their website.

 

I have all of the blue prints and plans needed for installation.

 

I intended to erect it at my hill top contest / DX station, but my wife I
got seriously ill and I had to abandon contesting and DXing, including such
ambitious projects.  Now I am ill and plan to sell my rural QTH.  I already
had other towers and monoband yagis erected and in use, so I did not need
this crank up tower.  I thought it would be perfect for the multiplier
position at my multi-multi contest station. It is also perfect for a serious
DXer who can erect only one tower, but wants multiple single band yagis that
play loud.

 

(I was the original customer for the revised designs by Hygain engineers,
known as 205CA, 155CA, and 105CA that provide better forward gain and front
to back ratios than the BA models.  I can provide those plans.)

 

The specifications for the LM-470 are as follows:  

 

LM-470

 

TYPE: Self-supporting, extendable, crank-up tower.

 

SPECIFICATIONS:

 

TOWER HEIGHT: Extended 70 feet.  Retracted 23 feet.

 

TOWER SUPPORT: Self-supporting, no guys.

 

WIND LOADING: Engineering analysis indicates the tower will support 18
square feet of

projected area per 85 MPH 3-second gust wind speed per ANSI/TIA EIA RS 222
Rev. G.

 

DEAD LOAD: The maximum dead load is 550 lbs.

 

WEIGHT: The tower with the base weighs 1200 pounds.

 

SECTIONS: The tower is made from four each 20-foot sections #5, #6, #7, and
#8.

 

DESCRIPTION:

Tower is complete with a gearbox, drum, hoisting cables, and a rigid
concrete base mount.  The tower price includes instruction manual and one
set of stamped drawings and calculations.  Hoisting cable system designed to
extend the tower telescopic sections uniformly.

 

The LM-470 is a motorized version of the above tower.  The l/2 HP electric
motor comes with an electric

control box and two limit switches wired for 110.  This tower has a positive
pull down.  A

“Positive Control” worm gear winch permits the raising and lowering of LM
towers without the aid of

stops or locks.  LM470 uses a 40:1 ratio winch.  The LM-470 also includes a
pre-wired motor control

assembly.  

 

This tower has a pulley frame on two faces and uses 3/16” x 7 x 19 Aircraft
cable.  The tower can be made with ¼” lift cables as an upgrade.  The
standard tower does use ¼” cable for the lift and pull down.

 

ACCESSORIES:

 

RCB-70 LT (#8 Wide Section) LM-470 Manual, Drawings, Calculations

CO-4 for LM-470 Replacement Pulleys

TA-70 Masts

#5 rotator plates

Cable Kit for LM-470

TB-2 Trust Bearing

 

Tashjian states that their towers have the following qualities, which sound
very similar to the Tri-Ex.

 

APPLICATIONS: General communications, amateur radio, two-way radio, light
cellular antennas, citizen band radio, television, cameras, and
environmental monitoring instrument installation. 

FINISH: All crank up towers are HOT DIPPED GALVANIZED after fabrication.
They are galvanized in accordance with ATSM A123. The towers are galvanized,
hot-dipped, after fabrication in molten zinc so that tube legs are zinc
coated inside the tubes as well as outside and completely covering all the
steel tower.  Drain holes shall be kept clear. 

MATERIAL: The towers are made of ASTM-36 structural shapes, ASTM A513
Tubing, ASTM A53 Grade B pipe.  Hardware is hot dipped galvanized or
Stainless Steel.  No plated hardware is used. 

WELDING: Welding is done in accordance with AWS D1.1 the latest Revision.
Welding rod and gas are selected to insure the highest ductility and to
insure embrittlement does not accord during the galvanizing process.
Certified AWS welders are used and they certification kept on file.  

DESIGN AND ENGINEERING
The crank up towers meets the American Institute of Steel Construction
standards for steel structures.  The concrete design meets the American
Institute of Concrete requirement for concrete and reinforcement.  The tower
design meets the 1997 Uniformed Building Code as stated in the calculations.


Karl Tashjian is a licensed Registered Civil Engineer. 

PROJECTED AREAS FOR ANTENNAS
Wind loading is dependent on the wind loading characteristics of whatever is
installed on the tower (antennas, lights, instruments, etc.), concrete base
size, type of concrete, soil conditions at the base of the tower which can
vary due to weather conditions (wet, dry, frozen) and type of soil (sandy,
rocky, loam, etc.).  Also, maximum expected sustained winds and wind gusts,
and icing probabilities.  The foregoing factors should be considered when
installing equipment on the tower. 

REINFORCED CONCRETE BASE
The base mount and the tower base are designed so that two bolts may be
inserted into the base mount and the tower base while the tower is laying
horizontally on the ground.  Then the base mount and the tower base are
hinged.  This allows the tower to be tilted upwards to the vertical position
where the final bolt can be inserted, thus locking the tower in the vertical
position. The purpose of this design is to make it easier and safer to erect
the tower.  To access the antenna for maintenance, a tilt over accessory is
required to position the antenna in a working elevation.

 

 

Tashjian advertises its LM-470 for a base price of $6,795 (plus California
sales tax).  It has many accessories and options for additional costs.  I
would be satisfied to get $3,795, saving you $3,000.  Take a look.  You
would save freight from California.  This is not a cheap, bargain,
lightweight tower.  This is a serious tower for serious hams!  Yet, I doubt
you could erect free standing towers, with guys, rotators, insulators, etc.
for that price.  Plus, you do not need a big yard for lengthy guy wires and
anchors.

 

If interested, please call me.  Please tell your friends.  Bill, K3ANS>>

 

 

William N. Goodman, CPA (K3ANS)

Residence:  765 Young's Hill Road

Easton, PA 18040-6726

Telephone:  610-258-5063

Cell: 484-241-6176

 

Work:  

 

Goodman & Company, CPAs &

Good Knives, LLC

Telephone: 610-253-2645

 

 E-mail: wgoodman at goodmancpa.com