Shively Labs 6822, Instruction Manual Installation, Operation, & Maintenance, Page: 10 / 78

Preparation
2
Tower-leg mount
The 6822 antenna may be mounted on a tower leg if the tower has at least
18" face width. The width is necessary to allow separation between the
antenna and the power divider, as shown in Figure 1 a.
The tower leg must extend at least five feet (1500 mm) above the top bay
and five feet below the bottom bay.
Figure 2 shows the mounting, cable run of a typical side-mounted single-bay
antenna.
Support-pipe mount
An alternative is to mount to a customer-supplied vertical pipe ( Figure 1 b),
which in turn is mounted on the tower. The pipe must be between 2-3/8” and
3-1/2” (60 and 89 mm) nominal outside diameter and mounted at least 16" off
the tower.
The mounting pipe must extend at least five feet (1500 mm) above the top
bay and five feet below the bottom bay.
Figure 3 through Figure 8 show support-pipe mounting for two- through eight-
bay antennas.
NOTE
Shively can accommodate other pipe sizes if necessary by special order.
Top-mounted support pipe
NOTE
This mounting method can only be used for a single-bay antenna,
because it allows no location to mount a power divider.
If your support pipe is mounted on top of a tower or building ( Figure 9 ),
locate the antenna with at least ten feet (3.1 m) of vertical clearance between
the bottom antenna bay and the top of the tower or building. Then mount the
pipe in accordance with the guidelines above.
Preparing the tower leg or
mounting pipe
Prepare the mounting location as follows (see Figure 10 ):
a. Starting at the top of the support pipe, mark the location of each bay in
accordance with the installation drawing.
b. Also, mark the specified location of any accessory mounts (eg: de-icer box
mounts), to make sure they will fit as planned.
c. To ensure good electrical contact between the support pipe and the tower,
remove the tower paint and any rust at the support pipe mount locations
before installing the mounts. After installing the mounts, be sure to touch up
the paint where you removed it.
CAUTION
If you don't get good elec-
trical contact between the
mounts, the support pipe,
and the tower, the
antenna may not perform
as designed and may pro-
duce stray signals that will
interfere with other ser-
vices on the tower.