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Shyam Telecom Limited
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Next Generation
Signal Enhancement
1. RF
cable installation must comply with local or
N
ational
E
lectrical
C
odes. The cable shall have nominal
50
-
O
hm impedance.
R
outing of
the
RF
cables is to be as per the site installation plan.
2. F
ix the supplied connectors to the
RF
cable and verify the following:
•
T
he center conductor to outer shield of
RF
coaxial cable indicates
“
Open
Circuit”
condition.
•
C
heck for any short circuit between center conductor and outer
shield.
•
P
lace 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.
R
epeater
G
ain
S
ettings
T
he repeater gain is one of the vital parameters since it also decides the
area required to be provided with
RF
coverage.
T
he noise contribution has to
be minimum while setting the gain which should be set with utmost care.
T
he
variation in gain up to
31
d
B
in steps
1
d
B
is possible to be achieved with the
help of software control attenuator, provided in the system.
T
he gain setting
for
U
plink and
D
ownlink path is independent of each other.
a.
F
orward
G
ain
S
etting
T
he process of setting the forward gain is very simple.
F
orward signal
level strength can be measured with a mobile hand set loaded with
NET
engineering software.
A
lternatively,
RF
output power of repeater can be measured using the
visual indication shown on the display panel of the repeater.
O
nce the
RF
output power has been determined, the attenuation will
have to be modified to reach the desired output signal level.
T
he gain of repeater can be set using any of the following methods:
a.
L
ocal
USB
serial interface mode
(GUI
based
)
b.
T
hrough
(
optional
)
wireless modem.
b.
R
everse
G
ain
S
etting
F
or reverse gain setting, a
31
d
B
variable attenuator is provided; the
required value can be inserted for the desired gain.
T
he gain is set to
such a value so as to cause minimum interference at the base station but
high enough to ensure a strong signal.
8.6.
C
ommissioning
I
mportant:-
R
epeater should not be connected to
P
ower without
termination at the antenna ports.
T
he termination can be carried out
either by the antenna connection as well as a dummy load or the
50
Ω
