Ritron RIT44-465 Manual Do Utilizador
10
3.3
INDICATORS
There are three LED indicators, green, amber and red, on the front panel. Their operation is detailed below:
Indicator
Function
Status
Green
Power-On
Off: Unit not powered-up
Blinking: Receiver Synthesizer Out-of-Lock
Steady On: Normal Operation
Amber
Receiver status
Blinking: carrier is on channel as set by RSSI squelch
Steady On: NXDN signal detected
Red
Transmit
Off: Unit not transmitting
Blinking: Transmitter Synthesizer Out-of-Lock
Steady On: Unit Transmitting
Note: If the receiver is out-of-lock (Green LED blinking), the unit will NOT transmit. See the Alignment
Section for details on tuning the VCO’s. Both the receiver and transmitter VCO are tuned at the factory for
operation over the 20 MHz band and should not need retuning.
3.4
CONNECTORS
There are four connectors on the Repeater: an antenna connector on the rear panel, a DC power connector,
RJ interface connector and USB port on the front panel. Their operation is detailed below:
3.4.1
Antenna Connector
On the rear panel is a type N Antenna Connector. An antenna, tuned to a 50 ohm match at the transmit
frequency, should be connected to this connector. Although it is permissible to connect a whip antenna
directly to the connector, best results are usually obtained by using a quarter-wave ground-plane antenna
mounted in an optimum location and connected to the Repeater via a length of low-loss, high quality
coaxial cable. The performance of the duplexer is somewhat dependent on the tuning of the antenna. Whip
antennas are very sensitive to proximity to metal and other surfaces which can make their operation, when
directly connected to the repeater, less than optimum. Also, a good quality coaxial cable should be used to
avoid de-sensing the repeater. Also, older cables have been known to cause problems.