User's Manual

z Page 3
Although the gain of the Dual Amplifier Booster/ Combiner is fixed, the output can be
adjusted by setting the input power level. The input to the Dual Amplifier Booster/
Combiner is the Nortel Power Amplifier (PA) whose output can be set at 16 power
levels in 2dB increments. As shown in diagram #1 and #2, setting the output level of
the PA to 41 dBm will result in a power level at the output of the Dual Amplifier
Booster/ Combiner of 45.5 dBm in the combined mode.
The Dual Amplifier Booster/ Combiner is followed by a Duplexer or TX filter module
which contains both a low-pass filter and duplex filter. The low-pass filter secures the
required reverse isolation and provides spurious and harmonic suppression of the
output signal. The duplex filter allows a single antenna to be used for both
transmitting and receiving. Due to the insertion loss of the Duplexer, the maximum
output power at the antenna connector of the radio base station is 44.5 dBm in the
combined mode.
Operation and Installation Instructions:
The following instructions should be followed when installing the unit in service:
Apply a 26-28VDC input voltage to the DC Input connector of the Dual
Amplifier-Booster/Combiner Module.
Insure that the DC Source is capable of delivering up to 15 Amps at 28VDC.
Apply a GSM signal of up to +41dBm to each RF input port of the Dual
Amplifier-Booster/Combiner Module.
The Dual Amplifier-Booster/Combiner Module will provide approximately
7.5dB or less of RF Gain.
Check the RF output to insure the proper output power is present.
{Approximately 30-35 Watts in the combined mode (DAC)}.
Adjust the input power level to insure the output power level is in compliance
with the values indicated in the table on page 2.
Install the Alarm Connector to the Alarm Output connector of the Dual
Amplifier-Booster/Combiner Module.