Andrew Antenna Gain vs Frequency, DB404 Series Installation Instructions

Models: DB404

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DB404 Broad Band Antennas

Andrew Corporation

 

 

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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 VSWR 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 VSWR 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- 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.

6.0 db

ANTENNA GAIN vs FREQUENCY

5.0 db

 

 

 

 

 

 

4.0 db

 

 

 

 

 

 

3.0 db

 

 

 

 

 

 

-10

-8

-6

-4

-2

fo +2 +4

+6 +8

These curves illustrate the gain of the DB404 and DB404L across a 20 MHz bandwidth. Maximum gain of 3.8 dBd (DB404) and 5.0 dBd (DB404L) occur at the mid-band frequency of each range. The gain of the DB404L is shown at the pattern maximum in the horizontal plane.

Figure 3. Antenna Gain Curves

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

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.

Side Mounting

When the DB404 and DB404L 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 DB5007 Side Mount Kit. The pattern for 12" and 24" towers will be similar.

DB404 (Omni) mounted on side of tower

DB404L, elements pointed toward tower

DB404L, elements broadside to tower

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. Other size clamps can be supplied on special order.

Figure 4. Typical Pattern Shape When Side Mounting

Andrew Corporation

Base Station Antennas

Telephone: 1-800-676-5342

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

8635 Stemmons Freeway

FAX (U.S.A.): 1-800-229-4706

U.K.: 0800 250055

Printed in U.S.A.

Dallas, TX U.S.A. 75247

Internet: www.andrew.com

Other Europe: +44 1592 782612

Copyright © 2003 by Andrew Corporation

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Andrew installation instructions Antenna Gain vs Frequency, DB404 Series Installation Instructions

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