User's Manual

Axell D-SBR 3709S Repeater
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd Doc PN 00038UMCD Rev. 1.6 13
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WARNING! Perform this procedure before connecting the antennas to the Repeater or
powering on the Repeater. The Repeater should not be operated prior to the verification of the
operating parameter in its installation environment.
Before connecting the antennas or power, verify isolation between the donor and
mobile antennas
The isolation between the Base/Donor and Mobile/Service antennas is critical.
• For proper operation of the Repeater, it is recommended that the isolation between
the Donor and Service antennas be at least 12dB higher than the Repeaters set gain.
• Insure proper vertical or horizontal distance separation between Donor and Service
antennas
NOTE: Lower isolation can lead to high in-band ripple, oscillations and low signal quality.
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.
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This test checks the signal strength from the BTS antenna to the Repeater.
Proceed as follows:
1. Using a Spectrum analyzer, measure the received signal from BTS at the Donor
antenna port near the Repeater.
2. Adjust the Donor antenna direction to receive the maximum signal strength.
3. Compare the received signal strength with the calculated signal strength from the
design phase.
4. In case of discrepancy, check for one of the following:
• Antenna out of direction
• Antenna tuned to side lobe instead of main lobe
• Antenna connector or antenna cable faulty
• Line-of-sight problem (obstruction), etc.
• Register the signal strength of the downlink channel for the system
operation phase.