RELM Communications Inc SRU50ABC ユーザーズマニュアル
S Series Repeater USER MANUAL
©RELM Communications Inc. Revision 1.0
27
Appendix B
Interface Connections
SR35/50 Rear Chassis Connector Description
Universal DB15 Analog I/O
Pin Number And Description:
Universal Analog I/O DB15 Female Rear Connector
Universal Analog I/O DB15 Male Rear Connector
Internal Circuit Board Header SKH Connector
8
1
1
EARTH.
Use this Earth for general connection and PTT return. For Analog Earth and Audio
common use the ANALOG EARTH pin.
Use this Earth for general connection and PTT return. For Analog Earth and Audio
common use the ANALOG EARTH pin.
15
9
2
RECEIVER AUDIO 600
Ω
Ω
Ω
Ω.
Normal receiver audio output from op-amp. Nominal line level is set to -10dBm.
Common return to analog Earth or differential audio output pin.
Common return to analog Earth or differential audio output pin.
7
2
3
RECEIVER AUDIO 5
Ω
Ω
Ω
Ω.
Low impedance differential audio output from op-amp.
14
10
4
RX MUTE / SQUELCH MONITOR.
The mute status may be monitored by reading this voltage. 5 volt logic high =
signal received or the mute is open. Output impedance = 100K
The mute status may be monitored by reading this voltage. 5 volt logic high =
signal received or the mute is open. Output impedance = 100K
Ω . Connect to high
input impedance (>1M
Ω).
6
3
5
O/C ALARM OUTPUT.
Open collector output sinks current to earth when an alarm condition occurs. Same
function as front panel Alarm LED. An alarm is generated if the Power Amplifier is
over temperature or if the supply voltage exceeds the defined limits. The trip points
are selectable via the utility program.
Open collector output sinks current to earth when an alarm condition occurs. Same
function as front panel Alarm LED. An alarm is generated if the Power Amplifier is
over temperature or if the supply voltage exceeds the defined limits. The trip points
are selectable via the utility program.
13
11
6
TX DC-FM INPUT.
Wide band audio or data may be connected to this point. In order to conform to
transmitter bandwidth emissions limits, this input is hard limited to the nominal
deviation and Bessel filtered -3dB @ 3400Hz for minimum group delay. Input
impedance is 100K
Wide band audio or data may be connected to this point. In order to conform to
transmitter bandwidth emissions limits, this input is hard limited to the nominal
deviation and Bessel filtered -3dB @ 3400Hz for minimum group delay. Input
impedance is 100K
Ω. If this input is not used then jumper # JMP14 on the Micro
Controller board should be removed to avoid any pickup of stray signals, or
alternatively do not connect any wires to this pin. Also avoid the use of ribbon
cables longer than 30-50cM as this may also result in excess coupling or crosstalk.
alternatively do not connect any wires to this pin. Also avoid the use of ribbon
cables longer than 30-50cM as this may also result in excess coupling or crosstalk.
5
4
7
TX REFLECTED POWER.
The voltage from the reflected power directional coupler in the Power Amplifier
goes directly to this pin. In a correctly terminated load the voltage should be less
than 200mV. Depending on the degree of mismatch at the load, the voltage will rise
to approx 3-4 volts for 50 Watts forward power. The internal reflected power
control circuit also monitors this point, such that when the reflected power voltage
exceeds half that of the forward power voltage the forward power is then reduced
to about 25% of full power. Full forward power is returned when the reflected
power drops below the trip point mentioned. The output impedance is about 5K
The voltage from the reflected power directional coupler in the Power Amplifier
goes directly to this pin. In a correctly terminated load the voltage should be less
than 200mV. Depending on the degree of mismatch at the load, the voltage will rise
to approx 3-4 volts for 50 Watts forward power. The internal reflected power
control circuit also monitors this point, such that when the reflected power voltage
exceeds half that of the forward power voltage the forward power is then reduced
to about 25% of full power. Full forward power is returned when the reflected
power drops below the trip point mentioned. The output impedance is about 5K
Ω.