Andrew Wireless Innovations Group MRB-LMR User Manual
3. Installation
MR Booster Manual: (MN001808-1, 9/99)
Page 25
REPEATER
DONOR
ANTENNA
PORT
MOBILE
ANTENNA
PORT
REPEATER
PORT
TO/FROM
BTS
MR
BOOSTER
MOBILE
PORT
COVERAGE
ANTENNA
I2C BUS
CONTROL
Figure 3-5. Typical MR Booster application (repeater)
3.5
System Optimization
Refer to Figure 3-5 for an example of an application in which the MR Booster is used
to boost a repeater. For additional information regarding system optimization, please
contact Mikom technical support at 1 (800) 800-7465.
to boost a repeater. For additional information regarding system optimization, please
contact Mikom technical support at 1 (800) 800-7465.
3.5.1
Downlink Gain Setting
The downlink gain is generally determined by the output power that provides
coverage of the hole that the MR Booster is filling. This power should not
exceed the specifications in Section 6 for differing technologies and number
of carriers. The gain of the repeater must be adjusted via the operational
software so that the desired output power equals the system gain (repeater
plus booster) plus the input power received from the BTS.
coverage of the hole that the MR Booster is filling. This power should not
exceed the specifications in Section 6 for differing technologies and number
of carriers. The gain of the repeater must be adjusted via the operational
software so that the desired output power equals the system gain (repeater
plus booster) plus the input power received from the BTS.
The input power can be determined from the downlink RSSI reading of the
repeater for each applicable RF channel. For greatest accuracy, the factory
test data sheet enclosed with the MR Booster can be used to determine the
booster gain near each channel of interest.
repeater for each applicable RF channel. For greatest accuracy, the factory
test data sheet enclosed with the MR Booster can be used to determine the
booster gain near each channel of interest.
3.5.2
Downlink Power Measurement
To ensure that the proper output power is reached, measure the composite
power coming out of the mobile duplexer port. Use a power meter capable of
handling 100 mW with a 30 dB, 60 W power attenuator on the mobile
connector for an accurate measurement without damage. The composite
power measured by the meter, after calibrating out the loss of the attenuator,
should be approximately equal to the desired power per carrier plus 10logN,
where N is the number of carriers.
power coming out of the mobile duplexer port. Use a power meter capable of
handling 100 mW with a 30 dB, 60 W power attenuator on the mobile
connector for an accurate measurement without damage. The composite
power measured by the meter, after calibrating out the loss of the attenuator,
should be approximately equal to the desired power per carrier plus 10logN,
where N is the number of carriers.