User's Manual

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.)

The overdrive fail on the USHR-800NIH bi-directional amplifier is design to detect

whether the over driving is transient or permanent. If the output power level of

reverse path(=Up Link) exceeds prescribed limit, then reverse path is disconnected

and the RX Alarm LED (RED) is on. Bi-directional amplifier automatically checks

output power level every 1 minute of a 5 minute cycle when reverse path has over

power . If reverse path still exceeds level then shut down mode continues for

another 10 minutes. After 10 minutes, reverse path is switched on again and it

checks output power level again. (Repeats the process)

4. Trouble Shooting

If the bi-directional amplifier does not operate properly after installation, first make

sure that the installation procedures as described in section 2 of this manual were

followed correctly. Inspect each connection, both RF and AC, and connectors for a

secure fit, checking to see if all the connections are made to the proper ports of the

unit and the antennas.

If the malfunction is due to an alarm condition, refer to the appropriate part of the

section 3.2 of this manual. Corrective actions may be taken for the overdrive

alarms.

There are no user serviceable parts in the USHR-800NIH.

DO NOT OPEN the unit. There is a danger of an electric shock.

Opening the covers of the unit will void all warranties.

To comply with FCC RF Exposure requirement, the antenna must be

kept 20cm away from user.

CAUTION!