Installation and Operating Instructions

Dekolink Wireless Ltd.;16 Bazel St.Qiryat-Arieh Petah-Tikva Israel, 49510
Tel- 972-3-9180-180; Fax-972-3- 190-9180 ;
[e-mail]
CBDA Installation
Install the CBDA Repeater in a shielded, ventilated and easy to reach area. Use low loss cables
to connect antennas to the CBDA. Install the CBDA close to the service area to improve output
power and noise figure. Mount the CBDA 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
CBDA.
Note
: For cooling purposes The CBDA must be installed with the RF connectors facing down.
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.
Service 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 CBDA gain. Lower isolation would lead to high in-band ripple. Oscillations will build up
when the isolation is lower than CBDA 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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Web site- www.dekolink.com rev 0 08/04 page 9 of 16