User manual

ADCP-75-154 • Issue 3 • August 2006

Page 11

2.4 Bias-T Installation

2.4.1 Mechanical Attachment and Cable Connections

The BIAS-T is designed to fasten directly into BTS coax-connector or directly to the feeder cable.

Integrated lightening protection is built into each Bias-T unit. There is no additional mounting

hardware required. Connect the Bias-T as follows:

1. Connect the ground cable to the Bias-T grounding pole (see Figure 12).

Figure 12. Bias-T Ground Cable Connection

2. Connect the other end of the ground cable to the site grounding pole.

3. Connect the BIAS-T “BTS” connector directly into the BTS coax-connector.

4. Connect the coaxial run going to the MHU to the “ANT” port of the BIAS-T.

5. Connect the mini coax cable to the SMB connector of the BIAS-T unit.

6. Connect the other end of the mini coax cable to the PDU front panel SMB connector

TMA1…6 (whichever is being used).

2.4.2 Additional Lightning Protection

If operator chooses to install further lightning protection between the MHU and Bias-T, it must

allow the DC voltage to pass through the lightening protector.

3 TROUBLESHOOTING

When something is wrong with the system, the red alarm LED on the PDU is activated and the

PDU alarm output is activated. In such a case, troubleshoot for problems as follows:

1. Check that the power is fed into the PDU. PDU alarm output is activated if there is no DC

fed in it, or if DC is out of the range (20-50 VDC) or polarity is incorrect.

Caution: Prior to installing any Bias-T unit, ensure that the BTS transmitter output is turned off

and that precautions are taken to ensure that the transmitter cannot be activated during the

equipment installation.

BTS ANT

Bias-T kit

Freq: 800 - 2200MHz

Temp: -40 to +65 C

Input: 5 to 24VDC

Max Current: 2A

P/N: 1344027

S/N: XXXXXXXXX

Date: YYYY/MM/DD

ASSEMBLED IN

KOREA

GROUND TERMINAL

21298-A