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Date Posted by Category User IP

2016-07-21 (UTC)


Towers & Access

FS: military mast AB-577

85- 90% complete with 8 sections and launcher - $ 550 pick up near Carson City NEVADA
AB-577/GRC mast system, complete:


The AB-577 mast is an all-aluminum tower designed to be field deployed
by one or more people. It does not require a prepared surface or
foundation of any kind. The kit consists of a launcher, eight tube
sections, guy wires and all hardware and tools to assemble a 50 foot
mast (see complete parts list below). Useful for any application
requiring a temporary or permanent tower such as lighting, surveillance,
emergency communications or RF survey work. The quick erection time also
makes the mast very useful for antenna experimentation and use in
neighborhoods where a permanently installed tower is not allowed.


Tower and guy locations are laid out using the supplied radius rope. The
tube carrier is removed from the launcher and the locking pins for the
brake, the elevator and the winch reel are removed. The top adapter is
attached to a mast section and the mast section is installed and locked
with the brake in the top of the launcher. The top guy ring is installed
over the top adapter section and the longest guy wires are connected to
the guy ring. The antenna may be attached to the top adapter at this
time or after the launcher has been guyed. Anchors are installed and the
base of the launcher is pinned to the ground. The first set of guy wires
is connected to the top of the launcher and adjusted using the built in
level to hold the launcher in a vertical position. The elevator
mechanism is lowered to the bottom of its travel. A tube is inserted and
clamped to the already installed top section. The brake is released and
the winch is used to raise the elevator platform and tube to its
uppermost position. The mast is locked in place and the elevator is
lowered back to the bottom. Another tube is installed and the process is
repeated. During the installation of the fifth tube the middle guy ring
and associated guy wires are attached to the mast. When all mast
sections have been installed, the guy wires are secured to the anchors
and tensioned. Under windy conditions or when erecting to 75 feet, the
guy wires should be tended by additional people to maintain the tower in
a perfectly vertical position. The entire mast sits on a bearing
assembly and may be rotated from the base using the supplied wrench.
This allows for antenna positioning from the ground without the use of a

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