Andrew DB404 Manuel utilisateur

GENERAL INFORMATION

The DB404 series is a heavy duty, light weight antenna for

use where an omni-directional or an elliptical radiation pat-

tern is desired.

OPTIONAL RADIATION PATTERN

One important feature of the DB404 series antenna is that it

permits the user to adapt the antenna to changing coverage

requirements. hen the dipole element pairs are spaced at

90° to each other, an omni-directional or circular pattern re-

sults. hen both sets of dipoles are in line (collinear - see

the DB404L illustration in Figure 1), the antenna has a di-

rectional characteristic, giving an elliptical pattern as shown

in Figure 2. Also, see Figure 3 for gain variation with fre-

quency for DB404 and DB404L antennas. The change from

one radiation pattern to the other is easily accomplished.

The banding clamps that hold the dipole elements against

the mast and the tape securing the antenna harness to the

mast are loosened. The top elements are rotated around

the mast as indicated in Figure 1, then the clamps again

securely tightened. Retape the antenna harness to the mast

- covering the tape that secures the cabling harness to the

mast with an aluminum backed tape such as Scotch #425.

(Part # DB11901)

GENERAL MOUNTING INFORMATION

The DB404 series antenna is designed for mounting on the

top of a tower or wooden pole. For best operation, it is rec-

ommended that the bottom dipole be above the tower. Side

mounting of the antenna requires the use of a DB5007 side

mount kit. Radiation patterns obtained with the antennas

side mounted on a 18" tower are shown in Figure 4.

Figure 1. Dipole Arrangement For Pattern Performance

Installation Instructions Bulletin 095022-000

Revision K • September 2003 • Page 1 of 2

Broad Band Antennas – Omni/Elliptical

DB404

NOTICE

The installation, maintenance, or removal of an antenna

requires qualified, experienced personnel. Andrew installation

instructions are written for such installation personnel.

Antenna systems should be inspected once a year by qualified

personnel to verify proper installation, maintenance, and

condition of equipment.

Andrew disclaims any liability or responsibility for the results

of improper or unsafe installation practices.

DB404

(Omni pattern)

DB404L

(Elliptical pattern)

Figure 2. Azimut Pattern wit Respect to Half Wave Dipole

DB404 DB404L

Do not install near power lines. Power lines,

telephone lines, and guy wires look the same.

Assume any wire or line can electrocute you.

Do not install on a wet or windy day or when

lightning or thunder is in the area. Do not use

metal ladder.

Wear shoes with rubber soles and heels.

Wear protective clothing including a long-

sleeved shirt and rubber gloves.

(continued on page 2)

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Bulletin 095022-000 • Revision K • September 2003 • Page 2 of 2

DB404 Broad Band Antennas Andrew Corporation

DB404 SERIES 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 trans-

mission 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 VS R as measured at the an-

tenna is recommended at this point. Note this measure-

ment carefully and record it for future reference.

6. After checking the VS R at the antenna, connect the

station transmission line to the antenna. (Make the con-

nection snug but do not apply heavy force from pliers.)

To avoid moisture problems, carefully wrap Vapor-

rap™ (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 Mo nting

When the DB4 4 and DB4 4L antennas are mounted to the side of a tower,

the horizontal radiation pattern necessarily becomes distorted. The follow-

ing indicates the typical pattern shape for an antenna that is side mounted

on a tower with an 18" face using the DB5 7 Side Mount Kit. The pattern

for 12" and 24" towers will be similar.

The DB5 7 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. Other size clamps can

be supplied on special order.

DB404L, elements broadside to tower

DB404L, elements pointed toward tower

DB404 (Omni) mounted on side of tower

Andrew Corporation

Base Station Antennas

8 35 Stemmons Freeway

Dallas, TX U.S.A. 75247

Telephone: 1-800- 7 -5342

FAX (U.S.A.): 1-800-229-470

Internet: www.andrew.com

Customer Service, 24 Hour: U.S.A. • Canada • Mexico: 1-800-255-1479

U.K.: 0800 250055

Other Europe: +44 1592 782 12

Printed in U.S.A.

These curves illustrate the gain of the DB4 4 and DB4 4L across a

2 MHz bandwidth. Maximum gain of 3.8 dBd (DB4 4) and 5. dBd

(DB4 4L) occur at the mid-band frequency of each range. The gain of

the DB4 4L is shown at the pattern maximum in the horizontal plane.

(Continued from page 1)

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- rap™ to prevent moisture problems.

Figure 3. Antenna Gain Curves

Figure 4. Typical Pattern S ape W en Side Mounting

-10

3.0 db

4.0 db

5.0 db

6.0 db

-8 -6 -4 -2 fo +2 +4 +6 +8

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