User's Manual

3. Operation

3.1 Introduction

This section provides information for operating the USHR-800 bi-directional

amplifier.

3.2 Operating Instruction

3.2.1 Power-up

Connect the bi-directional amplifier to AC/DC Adaptor. If no FAIL condition is

present, only the “POWER” LED will remain lit. The bi-directional amplifier is

then operating properly.

3.2.2 Fail Status

3.2.2.1 Overdrive Fail

There is one overdrive fail on the unit, for the up link. Over driving occurs when the

RF output power of the bi-directional amplifier exceeds a prescribed limit. This

means that the input RF power level is too high, or the bi-directional amplifier is

oscillating. The condition may be transient, caused by a passing emergency vehicle

emitting a strong signal for example, or permanent, due to a nearby base station. It

may also indicate low isolation between the antennas, which causes the unit to

oscillate (please refer to the section 2.6.2 of this manual for antenna alignment and

isolation.)