User's Manual

9
3. Operation
3.1 Introduction
This section provides information for operating the USHR-800NI repeater.
3.2 Operating Instruction
3.2.1 Power-up
Connect the repeater to AC/DC Adaptor. If no FAIL condition is present, only the
“POWER” LED will remain lit. The repeater 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.)
The overdrive fail on the USHR-800NI 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 FAIL 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)