Antenna Installation Site - Considerations; Connection To Antennas And To Power - Dekolink Deko2119 Product Manual

P M
RODUCT ANUAL
4.6 A I
NTENNA NSTALLATION
4.6.1 Base/Donor Antenna Installation Site Selection
The Base/Donor antenna installation is usually a directional antenna such as a
Yagi or Panel antenna with 8 to 13 dB gain. The location of the Donor antenna
must have line-of-sight with the base station. Proceed as follows:
•
Point the antenna to the base station to receive maximum input power.
•
Make sure the antenna is in line of sight with the base site. You can
raise the antenna higher if necessary.
4.6.2 Remote/Mobile Antenna Installation Site Selection
Before installing the Remote/Mobile antenna, see the FCC regulations for
information regarding recommended distances between the antennas and
The Remote/Mobile antenna is connected to the Mini-Repeater mobile port.
This type of antenna is usually omni directional (isotropic), or wide beam, with
0 to 2 dBi typical gain. This type of antenna is typically deployed within a
Distributed Antenna System (DAS). This antenna, in the context of the DAS,
serves to distribute signals indoors (in-buildings, tunnels, basements, parking
lots, shopping centers, etc.).
4.6.3 Antenna Isolation
For proper Repeater operation, Dekolink recommends that the isolation
between the Base/Donor and the Mobile/Service antennas be 8 dB, in contrast
with the 15 dB isolation required by conventional repeaters. Lower isolation
can lead to high in-band ripple, oscillations and low Signal Quality.
However, in case of poor isolation, the Smart ALC (SALC) comes into
operation, and ensures no-oscillation operation of the Block Selective Mini-
Repeater. Whenever the isolation drops, the Repeater automatically reduces the
gain to keep away from oscillations. Once the isolation problems are solved, the
Repeater automatically raises the gain anew.
To measure the isolation, prior to connecting the antenna to the repeater,
proceed as follows:
•
Inject a known signal into one antenna
•
Measure the coupled output from the opposite antenna
•
Perform this procedure across the frequency range of both Uplink and
Downlink bands.
4.7 C
ONNECTION TO
Perform the following connection procedures (see Figure 4 for connectors'
location):
1. Connect the Donor antenna cable to the BASE connector
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INI EPEATER
S – C
ITE ONSIDERATIONS
Note
population centers. Refer to paragraph 5.4.
A
NTENNAS AND TO
Proprietary Data
D 2119 D
EKO EKOLINK
P
OWER
Pub. 313-2006 Rev. 2.01S
W L .
IRELESS TD