5–7
070-20000340-01 Rev A
C
H APTER
5. I
NSTA LLI NG
R
AD IO S
AN D
A
NTENN AS
DC Voltage Insertion for Extra-Long Cables
If the radio signal cable is longer than 165 feet (50 meters), the power provided by
the Base Station Unit via this cable will be attenuated to the point that it is insufficient
to properly power the radio. In such a case, power must be inserted onto the radio
signal cable using a bias tee and an external power source (18 V dc, 1.5 A) as illus-
trated in
Figure5-5
.
Figure5-5
DC Power Insertion for Radio
To insert dc voltage onto the radio signal cable:
1.
Provide an 18 V dc power source capable of supplying 1.5 A, a coaxial bias tee
with two female F connectors and one BNC connector, and a short coaxial
cable with a male F connector at each end.
2.
Connect the short coaxial cable to the
RADIO IF
connector on the Base Station
Unit as illustrated in
Figure 5-4
.
3.
Connect the other end of the short coaxial cable to the dc blocking side (female
F connector) of the bias tee as shown in
Figure 5-5
.
4.
Connect the radio signal cable from the outdoor unit to the other female F con-
nector on the bias tee as shown in
Figure 5-5
.
5.
Connect a cable from the 18 V dc power source to the BNC connector of the
bias tee as shown in
Figure 5-5
.
Radio signal cable
Length greater than 50 ft (15 m)
Bias Tee
To BSU
To Radio
18 V dc source, 1.5 A
F connectors
F connectors
BNC connectors
dc block
