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RSA-M4 TWO-WAY RADIO
SUPERVISORY ADAPTER
The RSA-M4 is used to provide a simple and inexpensive method of connecting
voice logging recorders to two-way radios that are not remote controlled (with
remote controlled radios most digital logging recorders can be directly connected to
the control pair).
When the radio is transmitting, a relay is used to disconnect the audio output of the
RSA-M4 from receive audio and connect it to the transmitter audio only when
transmitting. The RSA-M4 is designed to match audio levels common with Motorola
radius series of 2-way radios. It increases the transmit audio volume fed to the
recorder by 500% to match receive audio and has a green LED to indicate when it is
sending transmit audio to the recorder.
Installation
The RSA-M4 is supplied with cables and connectors wired to meet most standard
applications. It can also be customized to meet unusual requirements.
1. The short three wire gray cable connects to the two-way radio audio.
a) Connect the BLACK lead to radio common (chassis ground).
b) Connect the GREEN lead to receive audio (about 0.5 vAC when active).
c) Connect the RED lead to transmit audio (about 0.1 vAC when active).
2. The short two wire gray cable connects to the 2-way radio transmitter
power. It powers the relay that switches the audio output (RJ-11 jack)
from receiver audio to transmit audio when the radio is transmitting.
a) Connect the BLACK lead to radio common (chassis ground,
as with 1a).
b) Connect the RED lead to a point in the radio that has +12vDC
power when transmitting (10 to 15vDC@40ma). This voltage
also powers the green LED.
3. The RJ-11 telephone style jack on the RSA-M4 connects to your recorder’s
audio input. Receive and transmit audio are mixed together on the
center two pins of this RJ-11 jack. Use the cable supplied with
each RSA-M4 or other suitable wiring to connect from this jack to your recorder.
4. Locate a convenient spot to mount the RSA-M4. Ensure that there
is enough slack in the cables so that they can be easily un-plugged,if required,
and that it will not interfere with the operation of the radio. Use the double stick
foam pad and cable ties which are included with each RSA-M4.
SUPERVISORY ADAPTER
The RSA-M4 is used to provide a simple and inexpensive method of connecting
voice logging recorders to two-way radios that are not remote controlled (with
remote controlled radios most digital logging recorders can be directly connected to
the control pair).
When the radio is transmitting, a relay is used to disconnect the audio output of the
RSA-M4 from receive audio and connect it to the transmitter audio only when
transmitting. The RSA-M4 is designed to match audio levels common with Motorola
radius series of 2-way radios. It increases the transmit audio volume fed to the
recorder by 500% to match receive audio and has a green LED to indicate when it is
sending transmit audio to the recorder.
Installation
The RSA-M4 is supplied with cables and connectors wired to meet most standard
applications. It can also be customized to meet unusual requirements.
1. The short three wire gray cable connects to the two-way radio audio.
a) Connect the BLACK lead to radio common (chassis ground).
b) Connect the GREEN lead to receive audio (about 0.5 vAC when active).
c) Connect the RED lead to transmit audio (about 0.1 vAC when active).
2. The short two wire gray cable connects to the 2-way radio transmitter
power. It powers the relay that switches the audio output (RJ-11 jack)
from receiver audio to transmit audio when the radio is transmitting.
a) Connect the BLACK lead to radio common (chassis ground,
as with 1a).
b) Connect the RED lead to a point in the radio that has +12vDC
power when transmitting (10 to 15vDC@40ma). This voltage
also powers the green LED.
3. The RJ-11 telephone style jack on the RSA-M4 connects to your recorder’s
audio input. Receive and transmit audio are mixed together on the
center two pins of this RJ-11 jack. Use the cable supplied with
each RSA-M4 or other suitable wiring to connect from this jack to your recorder.
4. Locate a convenient spot to mount the RSA-M4. Ensure that there
is enough slack in the cables so that they can be easily un-plugged,if required,
and that it will not interfere with the operation of the radio. Use the double stick
foam pad and cable ties which are included with each RSA-M4.
