User Manual

Next Generation
Signal Enhancement
• RF cable routed from DONOR antenna is connected at the BTS port
as indicated.
• RF cable routed to SERVER antenna is connected at TX/RX port for
signal distribution.
• For energizing the system, the cable from AC mains is connected at
AC mains port, range 100-240 V.
• USB port is provided for carrying out configuration and monitoring.
Important: Grounding of the unit has to be ensured before extending the
power to the repeater system.
Following points need considerations for laying of RF cable:
1. RF coaxial cable installation must comply with local or National Electrical
Codes. The cable shall have nominal 50-Ohm impedance. Pull and
route the RF coaxial cables as per the site installation plan.
2. Fix the supplied connectors to the RF coaxial cable and verify the
following:
• The center conductor to outer shield of RF coaxial cable indicates
an “Open Circuit” condition.
• Check for any short circuit between center conductor and outer
shield.
• Place short between the center conductor and outer shield using a
piece of wire temporarily and check the other end of conductor for
any break in the RF cable.
8.5. Gain Setting
The repeater gain setting is a vital parameter since it ultimately decides
the area required to be provided with RF coverage. The noise contribution
has to be minimum while setting the gain hence it should be set with utmost
care. The variation in gain up to 31 dB in steps 1 dB is possible to be
achieved with the help of attenuator provided in the system. The gain
setting for Uplink and Downlink path is independent of each other.
For example, If repeater has a maximum gain of 95 dB and the required
repeater gain is 60 dB, the attenuation of 30 dB is required to be
incorporated by inserting attenuator of this value.
Note: Repeater gain should be at least 15 dB less than the antenna
isolation.
Signals intercepted by DONOR antenna from BTS and transmitted to the
repeater are termed as Downlink/Forward signals and the signals
originated by mobile users and intercepted by SERVER antenna for
application to repeater are termed as Uplink/Reverse signals.
a. Forward Gain Setting
The process of setting the forward gain is very simple. Forward signal
level strength can be measured using NET engineering software in any
NOKIA handset e.g. NOKIA 6210 or any other engineering mobile
handset.
Alternatively, RF output power of repeater can be measured using the
visual indication shown on the display panel of the repeater.
Once the RF output power has been determined, the attenuation will
have to be modified to reach the desired output signal level.
The gain of repeater is set using software control through local USB
serial port or optional wireless modem
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