User's Manual

4.3 INDICATORS
There are two LED indicators, one green and one 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
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. A synthesizer Out-
of-Lock indication usually means that one or both of the voltage controlled oscillators (VCO’s) needs to be
re-tuned. See the Alignment Section for details on tuning the VCO’s.
4.4 CONNECTORS
There are three connectors on the Repeater; an antenna connector on the rear panel and a DC power
connector and interface connector on the front panel. Their operation is detailed below:
4.4.1 Antenna Connector
One 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.
4.4.2 DC Power Connector
On the right side of the front panel is the DC Power Connector. This connector is a male P-5 type with a
2.11 mm (0.083 in.) inside diameter, 5.51 mm (0.217 in.) outside diameter and a 9.5 mm (0.374 in.)
internal length. The positive terminal is on the outside.
4.4.3 Interface Connector
Near the middle of the front panel is the Interface Connector. This connector is a female telephone RJ-12
modular connector which allows local microphone, speaker, Push-to-Talk and programming connections.
The RITRON Speaker/Microphone sold for use with the Repeater plugs into this connector. The pinout
and description of the pins of this connector are as follows:
Pin No. Name Description
1 GND Circuit ground and common point for other pins.
2 AUDIO IN Pre-emphasized audio input pin. Approximately 25 mV @ 1 kHz
required for 60 % rated maximum deviation. Input impedance
approximately 3 k-ohm.
3 PTT/MIC Combination microphone input and Push-to-Talk input. When the
voltage on this input is taken below approximately 2 volts, the unit