User's Manual

SMR 700 800 HIGH POWER PS NFPA CLASS B SIGNAL BOOSTER
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless – Coverage
Date: 23-Nov-16
www.cobham.com/wireless
Doc. No.00060CDUM Rev. 3.4 Page | 8
2.2.3.3 Horizontal Separation Configuration
In the Horizontal Separation configuration, the Donor and Service antennas are installed on two separate
towers at approximately the same height. The towers can be either on the same side of the building or on
different sides of the building as shown below.
Figure 2-3. Donor and Service Antennas
Installed on Separate Towers
Figure 2-4. Service and Donor Antennas Installed
on Opposite Sides of the Building
2.2.3.4 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