User's Manual

D-MBR 3707-3708 PS NFPA CLASS B SIGNAL BOOSTER
PRODUCT DESCRIPTION AND USER’S MANUAL
www.cobham.com/wireless Cobham Wireless – Coverage
Date: 6-Set-15
Page | 6 Doc. No. 00060CDUM Rev. 1.0
2 ANTENNA REQUIREMENTS
This section describes the information and specifications required for Donor and Service antennas.
WARNINGS!!
• 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.
2.1 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 Signal Booster
and the attenuation.
2.1.2 Donor Antenna specifications
• Yagi type or similar – 10 to 15 dBi gain, very sharp beam pointed to the BTS.
• Cable and jumper loss is at least 2dB.
• The required Base signals should be the dominant signals; at least 6 dB higher power than other
signals.
• Example of antenna's typical specifications:
Gain: 8 dBd (=10.1 dBi)
VSWR: < 1:5:1
Impedance: 50 ohm
2.1.3 Installation Criteria
NOTE: Verify that the antennas meet requirements described in the previous sections..
Installation requirements:
• Select a location for the Donor antenna and verify that there is the signal strength is strong
enough 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 necessary).
• Install the donor antenna at a higher level (i.e. floor) than the mobile antenna.
• Must be installed at a minimum distance of 1 meter from any personnel within the area.