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D
W
L
.
EKOLINK
IRELESS
TD
4.3
A
NTENNA
Note 1: Do not operate the Dual Band BDA without terminating the antenna connections
with actual antennas or proper dummy loads.
Note 2: If the coaxial cables are NOT weather-resistant type, wrap the exterior coaxial
cables with insulation and holding tape (Type 3M Rubber splicing tape) for
environmental protection and to ensure longer lifetime.
To connect the antennas to the Dual Band BDA
Connect the Donor antenna to the Dual Band BDA BASE port.
•
Connect the Service antenna to the Dual Band BDA MOBILE port.
•
4.4
V
ERIFYING
The isolation between the Base/Donor and Mobile/Service antennas is critical especially
for high gain, outdoor applications.
For proper operation of the Deko3178B Dual Band BDA, it is recommended that the
isolation between the Donor and Service antennas be at least 15 dB higher than the
Dual Band BDA set gain.
The isolation between the antennas is critical for high gain outdoor Dual Band BDA.
To measure the isolation; inject a known signal into one antenna and measure the
power at the other antenna. This should be done across the frequency range of both
uplink and downlink bands.
NOTE: Lower isolation can lead to high in-band ripple, oscillations and low signal quality.
To measure the isolation, proceed as follows:
1. Inject a known signal from a signal generator into one antenna (preferably the
Donor antenna).
Pub. 300TC80031 Rev. 1.55
C
B
-D
OMPACT
I
IRECTIONAL
C
ONNECTIONS
Figure 4-1.Deko3178B – Antenna Connections
I
SOLATION BETWEEN
Proprietary Data
A
D
3178B
MPLIFIER
EKO
D
M
ONOR AND
P
M
RODUCT
ANUAL
A
OBILE
NTENNAS
Page 17
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