Andrew DB920 Інструкція з монтажу - Сторінка 3
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Andrew Corporation
(Continued from page 2)
4.
Locate the four mount-
ing brackets (two with
tabs and two without
tabs). Note the two
brackets with tabs
mate with the U-brack-
ets on the back of
the antenna (Figures 1
and 2).
5.
Insert the 6" bolts into
the brackets with tabs
as shown in Figure 2.
Note: Once the clamp
is attached to the
antenna, there will not
be enough room
between the clamp
and the back of the
antenna to feed the 6"
bolt into the clamp.
6.
Using the 1-1/2" bolts,
lock washers and nuts,
attach the assembled
bracket with tabs to the
antenna U-brackets
(Figure 2).
Note: One end of the antenna is labeled with an
"up" arrow. This end should point upward when the
antenna is mounted; this will allow the antenna's
drain hole to point downward.
7.
Bring the antenna into position on the tower and se-
cure it using the brackets without tabs and hardware
provided as shown in Figures 2 and 3. To avoid twisting
the antenna, ensure that the top and bottom mounting
clamps are aligned with each other (Figure 4). Securely
tighten all hardware.
8.
A check of the antenna VSWR as measured at the an-
tenna is recommended at this point. Note this measure-
ment carefully and record it for future reference.
9.
After checking the VSWR, the station transmission line
(not supplied) should be connected to the antenna us-
ing a male N-type connector or a 7-16 DIN connector,
depending upon the antenna model. Make the connec-
tion snug, but do not apply heavy force with pliers.
10. To avoid moisture problems, carefully wrap all connec-
tions with VAPOR-WRAP
DB11317), smoothing it into the cracks and over the
outer jacket of the transmission line. Failure to water-
proof the connection will result in improper operation of
your antenna.
11. Secure the transmission line to the tower in the best
Figure 3. Attaching Antenna to
a Mast Using DB390 Kit.
®
(part no. DB11316 or
Bulletin 095341-000 • Revision G • December 2003 • Page 3 of 4
Figure 4. Aligning Top and
Bottom Brackets.
MOUNTING
MULTIPLE ANTENNAS
Up to three antennas can be
mounted on a single mast;
however, several factors
must be considered to deter-
mine the proper mounting
method. When two or three
antennas are mounted on the
same mast, typical isolation is
45 dB or greater. The degree
of offset around the mast
combined with the diameter of
the mast must also be consid-
ered.
When two or three antennas
are mounted on a single mast, the mounting brackets will pre-
Directional Panel Antennas
position to avoid physical
damage to the cable.
12.
After the antenna
and transmission line have
been installed, a careful vi-
sual check should be made
to ensure that:
•
All mechanical connec-
tions have been made and
the antenna is mounted with
sufficient physical clearance.
•
The "up" arrow is point-
ing upward and the drain
holes in the end cap are ori-
ented downward.
•
All connections have been
carefully wrapped to pre-
vent moisture problems.
Figure 5. Two antennas
"Stagger Mounted."