Andrew DB404 installation instructions General Information, Optional Radiation Pattern

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Installation Instructions

Bulletin 095022-000

Revision K • September 2003 • Page 1 of 2

 

Broad Band Antennas – Omni/Elliptical

DB404

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. When the dipole element pairs are spaced at 90° to each other, an omni-directional or circular pattern re- sults. When 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.

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

 

DB404L

(Omni pattern)

(Elliptical pattern)

 

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Figure 1. Dipole Arrangement For Pattern Performance

DB404

DB404L

Figure 2. Azimuth Pattern with Respect to Half Wave Dipole

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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.

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Contents Optional Radiation Pattern General InformationGeneral Mounting Information Antenna Gain vs Frequency DB404 Series Installation Instructions

DB404 specifications

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