Andrew Wireless Innovations Group RPT-MR801 User Manual

M0050A0B.doc

Id.-No. 148222

Page 10 of 12

11-Mar-99

An example shall demonstrate the above statements.

For further details how to perform certain actions please refer also to the Repeater manual.

Assumed we want to replace a module with variable bandwidth in an Extension Unit 2. The
desired bandwidth is 16.2 MHz and the desired centre frequency in the UL is 902.5 MHz and
in the DL 947.5 MHz. The attenuation in UL has to be set to 16 dB and 22 dB in the DL.

First thing is to check whether the rotary switches of the module are in the correct position.
The rotary switch for filter 1 in UL has to be in position 8, for filter 1 in DL in position 9, for
filter 2 in UL in position A and for filter 2 in DL in position B. (See table “Rotary switch
position”.)

The module has to be inserted and if the bandwidth of the filters in the module is not known it
can be gained with the VER command. Entering the VER command will be responded by
(amongst others) the hardware of the Repeater including the bandwidth of the filters. The
response for example of the software in a MR301A with 25 MHz filters would be:
MR301A-25

, where 25 shows the bandwidth in MHz.

Next thing to do is to calculate the centre frequencies that have to be entered. With the above
given formula we get:

UL:

2

1

+

=

=  (902.5 – 8.1) MHz + 12.5 MHz = 906.9 MHz

2

2

−

=

=  (902.5 + 8.1) MHz – 12.5 MHz = 898.1 MHz

DL:

CF1 = (947.5 – 8.1) MHz + 12.5 MHz = 951.9 MHz

CF2 = (947.5 + 8.1) MHz – 12.5 MHz = 943.1 MHz