User's Guide MR2003B/D
Andrew Wireless Systems * Industriering 10 * 86675 Buchdorf * Germany *
Phone: +49 9099 69-0 * Fax: +49 9099 69-930 *
email: [email protected] * http://www.andrew.com
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5. Configuration of the LEDs and Connectors
G0783ZR
The MR2003B
is equipped with an integrated (indoor)
antenna and with an RF port to/from the Node B to the
donor antenna.
The RF connector (SMA female) is situated in the
middle of the connector panel of the repeater. This
port has to be connected to the RF cable of the donor
antenna to/from the Node B.
The MR2003D
is equipped with an external (indoor)
antenna port and with an RF port at the opposite side
to/from Node B.
The RF connector (SMA female) is situated in the
middle of the connector panel of the repeater. This
port has to be connected to the RF cable of the donor
antenna to/from the Node B. The RF port connector
to/from the user equipment at the opposite side has to
be connected to the RF cable to the external indoor
antenna that establishes the communication with the
user equipment (UE).
The socket for the DC supply is situated on the right
of the RF connector to/from the Node B
(MR2003B/D). Power supply voltage is 6.7 to 7.5 Vdc,
current is 1.7 A typ. Use the PSU supplied only.
There are two possibilities to provide the MR2003 with
power:
The first one is to use an external power supply and
connect it to the DC socket of the repeater. The other
one is to bias the MR2003 via the cable to the RF port
to/from Node B.
For the external power supply, only the power supply
that was shipped with the unit must be used. If the
MR2003 is biased, make sure that the correct voltage
is fed into the MR2003. Furthermore, the DC socket of
the repeater must not be connected if the bias via RF
cable is used.
The gain of the MR2003 repeater can be adjusted (by
internal attenuation) via a rotary switch; alternatively,
the gain of the repeater is controlled by the auto-setup
feature, see chapter
To get access to the rotary switch, the cover has to be
removed.
6. Functional
Description
The MR2003 is a repeater operating in the UMTS
frequency range. The operation principle is given with
regard to the following block diagrams.
MR2003B
MR2003D
Downlink signals reach the duplexer, i.e. the
frequency separation unit that splits and re-combines
uplink (UL) and downlink (DL).
From the duplexer, the signals get to a pre-amplifier
and afterwards to a mixer. The mixer converts the
signals down to an intermediate frequency (IF). An IF
filter provides the selectivity of the repeater. After the
IF filter, the signals are re-converted to the original
frequency by means of another mixer. A final amplifier
boosts the signal and provides the required output
power.
After the final amplifier, a power detection measures
the output power and controls the gain. This feature is
the automatic level control (ALC) and keeps
intermodulations and spectrum emissions below the
limits of 3GPP 25.106. Finally, the signals are fed to
the integrated antenna (MR2003B) or the external
antenna (MR2003D).
