User's Manual

Page 13 of 21
IDEN Digital Repeater Installation
Manual
10 BDA INSTALLTION
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.
The BDA Base/Donor connector port is connected to donor antenna, usually a Yagi antenna,
while the BDA Mobile/Remote connector port is connected to a mobile antenna; outdoor indoor.
10.1 BASE / DONOR ANTENNA INSTALLTION
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 site 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.
10.2 REMOTE / MOBILE ANTENNA INSTALLTION
The second antenna is connected via cable that has typical 1~10 dB attenuation (depends on the
length of the cable) to the CBDA MOBILE port. This type of antenna is omni directional
(isotropic), or wide beam, with 0 to 2 dBi typical gain and is installed and distributes indoor (in
buildings, tunnels, basements, park lots, shopping centers etc.). Typical specifications: gain: 2
dBi, VSWR: better than 2:1, Impedance: 50 ohm. For direct connection to the BDA this antenna
must be installed to provide a minimum separation distance of 2 m (200 cm) from persons
within the area.
Less separation is needed if the power from this power is divided into many antennas covering
many floors or areas.