Axell D-MBR 3007-3008-PS-NFPA
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd
UMCD00013 Rev 2.2
21
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.
3.6.2 Verifying the Link between the BTS and the Repeater
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.
•
In case of discrepancy, check for one of the following:
o
Antenna out of direction
o
Antenna tuned to side lobe instead of main lobe
o
Antenna connector or antenna cable faulty
o
Line-of-sight problem (obstruction), etc.
•
Register the signal strength of the downlink channel. for the system operation
phase.
3.7 Antenna Connections
WARNING!
Do not connect the antenna cables to the Repeater before verifying the installation
parameters - specifically the isolation between the antennas.
DO NOT POWER-ON the Repeater without either the antennas being connected
or the antenna connections terminated with dummy loads
NOTE: If the coaxial cables are NOT weather-resistant type, wrap the exterior coaxial cables with
insulation and holding tape (Type 3M Rubber splicing tape) for environmental protection and to
ensure longer lifetime.
To connect the antennas to the Repeater
1. Install the antenna cables along their path to the Repeater, and connect them to the
Antennas.
Note: Be sure to use low loss cables.
2. Connect the
Donor antenna
to the
Repeater BASE port
. (Donor antenna
specifications and installation criteria are described in section 2.1.
3. Connect the
Service Antenna
to the
Repeater MOBILE port.
(Mobile antenna
specifications and installation criteria are described in section 2.2).
4. Verify all RF connectors are tightened and the cables and antennas are secured.