(Continued from page 1)
INSTALLATION INSTRUCTIONS
1. Remove the antenna from the shipping box and ensure
that all parts are on hand and that there is no physical
damage.
2. Inspect the antenna feed assembly output connector
to determine that it mates with the end of your station
transmission line. Do not remove any connector or
cable from the antenna feed assembly; these are all a
part of your antenna.
.
3. Verify that the frequency to which the antenna has been
tuned is the frequency on which your radio system is to
operate.
4. Attach the furnished DB365 mounting clamps to the
bottom of the antenna mast at the designated locations.
Mount the antenna on the tower with the bottom dipole
above the tower.
5. A check of the antenna VSWR as measured at the
antenna is recommended at this point. Note this
measurement carefully and record it for future reference.
6. After checking the VSWR at the antenna, connect the
station transmission line to the antenna. (Make the
connection snug but do not apply heavy force from
pliers.) To avoid moisture problems, carefully wrap
VAPOR-WRAP
®
(Part # 11317 or 11316) around the
connection, working the compound into all cracks and
smoothing it over the outer jackets of the transmission
line. Failure to tape and waterproof the cable connection
will result in improper operation of your antenna. Properly
secure the feeder cable and antenna transmission line to
the tower in the best position to avoid physical damage.
Side Mounting
The DB5007 Side Mount Kit positions the antenna approximately 16"
from the tower and consists of a galvanized bracket and the necessary
hardware for attaching the bracket to round tower members up to 3"
OD, or angular members up to 2-1/2" on a side.
Figure 4. Typical Pattern Shape When Side Mounting.
These curves illustrate the gain of the DB404 (omni and elliptical) across a
20 MHz bandwidth. Maximum gain of 3.8 dBd (omni) and 5.0 dBd (elliptical)
occur at the mid-band frequency of each range. The gain of the elliptical is
shown at the pattern maximum in the horizontal plane.
Figure 3. Antenna Gain Curves.
When mounted to the side of a tower, the horizontal radiation pattern
necessarily becomes distorted. The following indicates the typical
pattern shape for an antenna that is side mounted on a tower with an
18" face using the DB5007 Side Mount Kit. The pattern for 12" and 24"
towers will be similar.
7. After the antenna and transmission line installation is
complete, a careful visual check should be made to
ensure that:
• All mechanical connections have been securely made.
• The antenna is mounted on the proper leg of the tower
with sufficient physical clearance.
• All connections have been carefully wrapped with VA-
POR-WRAP to prevent moisture problems.
Omni, mounted on side of tower
Elliptical, elements pointed toward tower
Elliptical, elements broadside to tower
095022-000
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