User's Manual

SMR 700 800 HIGH POWER PS NFPA CLASS A SIGNAL BOOSTER
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless – Coverage
Date: 22-Dec-16
www.cobham.com/wireless
Doc. No.00068CDUM Rev. 2.3 Page | 10
2.2.4.4 Verifying Isolation between Donor and Service Antennas
Note the following:
• The isolation between the Donor and Service antennas is critical especially for high gain, outdoor
applications.
• For proper operation of the Signal Booster, it is recommended that the isolation between the Donor and
Service antennas be at least 15dB higher than the Signal Boosters set gain. (Lower isolation can lead to
high in-band ripple, oscillations and low signal quality.)
• Ensure proper vertical or horizontal distance separation between Donor and Service antennas
To measure the isolation, proceed as follows:
1. Inject a known signal from a signal generator into one antenna (preferably the Donor antenna).
2. Measure the coupled output from the Service antenna, using the Spectrum analyzer and LNA if
applicable.
3. Perform this procedure across the frequency range of both the Uplink and Downlink bands.
4. Register the lower result for system operation.
2.3 Required BTS Information
Required BTS Information
• BTS channels
• BTS output power per channel
• BTS antenna gain
• BTS antenna height and distance from antenna site
2.4 Selecting the Booster Location
When selecting a location, verify the requirements described in this section are met.
2.4.1 Installation Location Criteria and Environment
Location criteria
• Application type – indoor or outdoor
• Distance from antenna site and BTS antenna height.
It is recommended that the installation location be as close as possible to the antenna site in order to
maintain the cable loss to a minimum.
• General surroundings and accessibility of location
• Mounting surface - Use a suitable mounting surface, such as a flat back rigid wall.
• Plan mount – according to overall dimensions of the unit enclosure.
• Plan connection cable clearances - the connections located on the underside of the unit will need at
least 300mm vertical clearance below the unit to enable the connections to be made. The minimum
bend radius for RF cables must not be less than the recommendations made by the cable manufacturer.
Plan the cable runs and ensure adequate space is available.
• Allow for door opening - ensure that there is sufficient space at the front of the unit to allow the door
to be fully opened and for maintenance engineers to get access to the unit with test equipment such as
a spectrum analyzer. Allow an additional 500mm of space in front of the unit when the door is fully
open.