User's Manual

UHF BI-DIRECTIONAL AMPLIFIER TECHNICAL MANUAL

- Antennas should be mounted following the manufactures guild lines for RF connection and being

affixed to the building or location of desired signal.

- All cables used in the DAS system shall be 50 ohms and clamped properly to insure the cables 50 ohm

impedance characteristics. Improper clamps will change the impedance of the cable at that location thus

changing the efficiency of the system.

- Antenna placement through the DAS system is important to impose a balanced distributed signal. The

use of proper valued (dB) decouples, power dividers, and signal taps is important to promote a balanced

system.

BDA Installation

1) Verify that the frequencies listed on the Amplifier Box label agree with the channel assignments

for the Duplexer Box. If they are not the same, contact the factory for advice and instructions.

Please read the Warnings and Notices at the bottom of the next page before proceeding.

2) Mount the BDA system on a grounded rack, in a cabinet or on the wall. The BDA system is all-

metal and the mounting screws on the Filter & Diplexer Housing can be used as attachment

points for a ground wire.

3) Check the isolation between the Donor antenna and the Distribution antennas is 20dB above

the Gain of the Amplifier.

4) Connect the Donor Antenna Port and Antenna Output to Distribution Network port through

the Duplexer Box using solid-shield or double-braided 50 ohm coaxial cable with suitable

connectors.

5) Verify the MSA#1 setting of both Up-link and Down-link VGA. These attenuators should be

set at maximum attenuation (i.e. dial at position “F”).

6) Install the external UPS/Battery system if it is need. Connect the BDA to the AC power

source. Turn on the BDA unit by pressing the power button on the bottom of the BDA box.

Verify if the power button light is on. Inside the BDA box, verify if all power LEDs on the

VGAs and PAs are on (green color). Verify if the PA_OUT_SWR LEDs are on green.

7) After the unit is on, verify the RSSI LEDs on both Down-link and Up-link VGA. At 30dB

attenuation at the input, normally only the LOW LED could be on. Decrease the MSA#1

attenuation gradually (i.e. do not jump directly from “F’ to “0” position) until both LOW and

HI LEDs are on. If the HI LEDs cannot be on even at MSA#1 = 0dB attenuation, verify if

the input signal is present and at the expected level, then just leave the MSA#1 dial at “0”.

8) The BDA output powers are now at its maximum operable level in both up-link and down-link

direction. By mean of the MSA#2 (and if needed, use additional attenuator pads), optimize

the output power to the desired (lower) level, according to the specific distribution system

environment.

Installation is now complete.