Справочник Пользователя для Andrew Wireless Innovations Group 803D15

 

User's Guide for 

MR803D, MR853D, MR903D and MR1903D 

 

Andrew Wireless Systems GmbH * Industriering 10 * 86675 Buchdorf * Germany * 

Phone: +49 9099 69-0 * Fax: +49 9099 69-930 * 

email: WIsupport.germany@andrew.com * http://www.andrew.com 

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The operation principle of the miniRepeaters is given 
with regard to the following block diagram. 
 

manual

Attenuation
setting

automatic

E0783B0

 

 
Downlink signals from the BTS reach the internal 
duplexer through the “to/from BTS” RF port. Following 
the DL path from the duplexer, the RF signals are 
amplified by an LNA, which feeds the amplified 
signals to a mixer. The mixer converts the signals 
down to an intermediate frequency (IF), where a high 
rejection IF filter provides excellent selectivity to allow 
only the user’s frequency band to be repeated. After 
the IF filter, the signals are re-converted to the original 
frequency by means of another mixer. A final amplifier 
boosts the RF signals to the required output power. 
 
After the final amplifier, a power detection circuit 
measures the output power and controls the gain 
through a closed loop feedback circuit. This feature is 
the automatic level control (ALC), which prevents the 
repeater from being overdriven and maintains 
intermodulation products and spectrum emissions 
below the regulation limits. Finally, the RF signals are 
fed to the external antenna through the duplexer and 
“to/from Mobile” RF port. 
 
The uplink signals are received by the external 
antenna through the “to/from Mobile” RF port and are 
then fed to the duplexer. After the duplexer the RF 
circuitry and functionality is identical to the downlink 
path, which provides high rejection filtering for the 
desired operation frequency band and ALC 
functionality. 
 

 

G0825Z8

 

 

 

 

The miniRepeater may only be mounted 
horizontally to a wall according to the above 
drawing to ensure the natural convection 
cooling. Do not mount the miniRepeater to the 
ceiling! 

Always choose a mounting location that 
avoids condensation!

 

 

 

Size H x W x D 

114 x 154 x 51.5 mm 
(4.5 x 6.1 x 2.0 inch) 

Weight 0.7 

kg 

Sealing Class 

IP30 

 

 

The environmental specifications are according 
to ETS 300 019 (European Telecommunication 
Standard) and the safety specifications are 
according to UL Std No 1950 and CAN/CSA-
C22.2 No. 60950. For further details please ask 
your supplier. 

 

MR803D, 18 MHz Filter 

18.7 MHz 

 

MR853D, 1.5 MHz Filter 

2.1 MHz 

MR853D, 10 MHz Filter 

10.7 MHz 

MR853D, 12.5 MHz Filter 

13.2 MHz 

MR853D, 25 MHz Filter 

24.7 MHz 

 

MR903D, 6 MHz Filter 

6.6 MHz 

 

MR1903D, 5 MHz Filter 

7.0 MHz 

MR1903D, 10 MHz Filter 

11.0 MHz 

MR1903D, 15 MHz Filter 

16.0 MHz 

Wall 

Mounting 
bracket 

miniRepeater 

V1550_X03