User's Manual

Dekolink Wireless Ltd.;16 Bazel St.Qiryat-Arieh Petah-Tikva Israel, 49510
Tel- 972-3-9180-180; Fax-972-3- 190-9180 ;
[e-mail]
BDA INSTALLATION
Install the BDA Repeater in a shielded, ventilated and easy to reach area. Use low loss cables
to connect antennas to the BDA. Install the BDA close to the service area to improve output
power and noise figure. Mount the BDA with RF connecters pointing down. The RF connection is
made via two type “N” female connectors. The RF connector labeled “Base” must be connected
to the antenna; usually a Yagi; pointing to the base station. The RF connection labeled “Mobile”
must be connected to the antenna pointing into the area to be covered by the BDA.
DONOR ANTENNA INSTALLATION/ BASE
Typically this is a directional antenna such as Yagi or Dish antenna of 10 to 15 dB gain. This
antenna is pointed to the base station to get maximum input power. This antenna should be in
line of sight with the base site. Raise this antenna higher if no line of sight is achieved. The
required Base signals should be the dominant signals; at least 6 dB higher power than other
signals.
Choose the antenna site to get the maximum isolation from the remote (mobile serving) antenna.
MOBILE ANTENNA INSTALLATION/ REMOTE
The remote antenna is an Omni antenna or a directional antenna according to the coverage
requirements.
For indoor applications covering a large building, the RF signals are split using power dividers
and distributed to many antennas each covering a floor or a small area.
ANTENNA ISOLATION
For proper operation the isolation between these two antennas must be at least 12 dB higher
than the BDA gain. Lower isolation would lead to high in-band ripple. Oscillations will build up
when the isolation is lower than BDA gain.
The isolation between the antennas is critical for high gain outdoor repeaters.
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.
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www.dekolink.com
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