User's Manual

SER

S MANUAL FOR BAND SELECTIVE REPEATERS

03P

User'sManual.doc Id.-No.:154999 Page 29 22-Jan-01

5. COMMISSIONING

5.1. PREPARATION

5.1.1. General

Please read the description carefully to avoid mistakes and proceed step by step as

described. The repeater must not be operated with open antenna ports. This means

that each antenna port has to be terminated with either a 50Ω resistor, a dummy load

or a connected antenna. The repeater could be damaged when operated without any

50Ω terminations.

When opening the repeater, do not damage the seals on the devices inside the

repeater. Warranty void if the seals are broken!

5.1.2. BCCH-Channel

Apart from the antenna isolation measurement described in chapter 5.1.3, it is also

necessary to measure the BCCH level (BCCH=Broadcast Control Channel). The

resulting max. allowed repeater gain of the antenna isolation must be compared with

the resulting max. allowed repeater gain of the measured BCCH channel. The lower

gain has to be set for the repeater.

The following example clarifies how to set the correct gain:

Antenna isolation:

Antenna isolation: 100 dB

Safety Gain Margin (SGM)*: 15 dB

-------------

Allowed max. gain: 85 dB

BCCH channel:

Power out**: +30 dBm

Received level of BCCH: -(-40) dBm

----------------

Allowed max. gain: 70 dB

* Refer to chapter 5.1.3 Antenna Isolation for further information about SGM.

** Max. P

out

required by customer, but not higher than the rated P

out

per channel stated for this

repeater at the required number of channels.

In this case, 70 dB gain has to be set for the repeater.

∗ Note: If a higher gain is set, the ALC will be active! This might affect the

quality of the signal!