User Manual

AXELL D-CSR 3302 US VHF REPEATER
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd Doc PN 0034B-UM Rev. 2.1 5
2 Antenna Specifications and Installation
Criteria
WARNING!!!
o The installer is held accountable for implementing the rules
required for deployment.
o Good engineering practice must be used to avoid interference.
o 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.
2.1 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.
2.1.1 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.
2.1.2 Donor Antenna specifications
 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:
 8 element yagi 11.8dBi beam width 54
o
 12 element yagi 13.8dBi beam width 36
o