User's Manual

AXELL CSR 3604-3304 UHF REPEATER
PRODUCT DESCRIPTION AND USER’S MANUAL
Page 18 of 67
Document number: 3633B-UM
© Axell Wireless Ltd
Revision. 3
26/10/2015
Antenna Specifications and Installation Criteria 4
WARNING!!!
The installer is held accountable for implementing the rules required
for deployment.
Good engineering practice must be used to avoid interference.
Output power should be reduced to solve any IMD interference
issues.
This chapter provides information on the specifications of the donor and service antennas
suitable for operation with this repeater, and on the installation requirements of the antennas.
NOTE: The Donor and Mobile antennas can be positioned and installed (without connection
to the Repeater) at any time either before or after mounting and grounding the Repeater.
4.1 Base (Donor) Antenna
The Base (Donor) antenna is usually installed outdoors and is either a directional antenna
such as a Yagi or a Panel antenna.
4.1.1 Required Antenna Information
You will require the following antenna information:
 Antenna type and characteristics
 Height
 Length and type of coaxial cable required for connecting the Donor antenna to the
Repeater and the attenuation.
4.1.2 Donor Antenna specification
 Very sharp beam pointed to the BTS.
 Minimum cable and jumper loss = 2dB.
Equation (2) - Max DONOR antenna gain
Max DONOR antenna gain (dBi) = 39.1 – (27dBm - cable losses in dB).
For example:
No. of Antennas
Cable Losses
Max Allowed Antenna Gain
1
2
39.1 - (27-2) = 14.1dBi
Typical Antenna Types:
 4 element yagi 8.8dBi beam width 90
o
 6 element yagi 10.3dBi beam width 64
o
4.1.3 Installation Criteria
Installation requirements:
 Select a location for the Donor antenna and verify that there is enough signal strength at
that location.
 Install the Donor Antenna at the designated height.
 The antenna should point to the direction of the base station for maximum input power.
 Verify that the antenna is in the base stations line of sight (raise the antenna if needed).