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The RSA-M3 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). It combines receive and transmit audio at levels matched to the
line input of voice logging recorders. It also provides transformer
isolation and RF bypass.
For use only with two-way
radios that have switched transmit audio (about 300 mv of transmit
audio that is muted by the radio when not transmitting). Many radios
no longer mute the transmit when not transmitting. If your radio
does not mute the transmit audio when not transmitting, see:
Omnicron RSA-M4 or
RSA-U5 adapters. .
RSA-M3 is supplied with cables and connectors which have been wired
to meet most standard applications. It can also be customized to
meet unusual requirements. Consult your place of purchase if cables
are required with non-standard lengths, connections, or circuitry.
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 RJ-11
telephone style jack on the RSA-M3 connects to your recorderís
audio input. Receive and transmit audio are mixed together on the
center two pins of this RJ-11 jack. Use the eighteen-foot phone
cable supplied with each RSA-M3 or other suitable wiring to connect
from this jack to your recorder.
3. Locate a
convenient spot on your radio to mount the RSA-M3. 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-M3 to attach it to your radio.
IN CASE OF DIFFICULTY If
the unit fails to work properly, recheck all connections and test
your recorder to see that it is operating properly. Make sure that
the microphone is only active when transmitting, otherwise you could
record room sounds between transmissions (set radio jumpers, or
program for switched transmit audio). Assistance is available from
your place of purchase, or directly from Omnicron Electronics at the
phone numbers listed below and via this web site.
Federal law 90-351 title 18, section 2511, sub section 2D, requires
that at least one participant in a recorded conversation be informed
of the recording. Check your state and local regulations for further
assistance in the selection of the products that are best suited to your application.|