11
Installing Feedline and Transformer
There are four basic feedline mounting styles:
• Leg mount, where the mount attaches directly to a tower leg
• Pole mount, where the mount attaches directly to a customer-sup-
plied mounting pole. The pole may be mounted alongside or atop
the tower.
• Face mount, where the mount includes a crossbar which horizon-
tally spans two tower legs.
• Two-leg-pick-up mount, where a crossbar spans two tower legs and
extends away from the tower.
Simplified top views of the four styles are shown in
Figure 6
on page 10.
Feedline mounts vary from installation to installation, to accomodate various
tower and mounting pole requirements.
Figure 7
on page 12 shows several
common configurations.
Your feedline mounts may be one of the common designs shown; if they are
not, they will be shown in detail on your installation drawing.
Before you begin installation, study the mounts, the mounting tower leg(s) or
pole, and your installation drawing carefully, establishing which mount(s) will
be used for each component.
a. On the tower, starting at the top, use a steel measuring tape to find the
location of each bay in accordance with the installation drawing. Mark the
mount locations.
b. Mark the specified location of any accessory mounts, such as for the
transformer or special coax input line sections, to make sure they will fit as
planned.
c. Watch carefully for any interferences by tower members or guy wires which
were not accounted for in the design.
d. Where the mounts will be in contact with the tower or pole, scrape the tower
paint away to ensure good electrical contact.
e. Secure the feedline mounts to the tower leg(s) or mounting pole using
U-bolts.
f. When all mounts are in place, sight along them vertically and align them
before finally tightening the hardware.
g. Touch up any exposed metal on the tower or pole.
If any problems appear during this process, please call Shively Labs and dis-
cuss them with the installation designer.
Installing the Feedline
Sections
a. Install the feedline sections, transformer, and other components carefully, in
accordance with your installation drawing and the illustrations in this
chapter.
b. Secure the feedline to the mount saddles using the hose clamps provided
(generally, two hose clamps on a 6"-long saddle and 4 hose clamps on a 12"-
long saddle). To align the antenna to the proper azimuth, match the
stenciled line on the feedline with the weld dot on the top edge of the mount
saddle.
NOTE
You may use anti-seize on
U-bolt threads to help
prevent galling.
