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Redback® A 1760 Microphone Delay/Mic-Line Recorder
5.0 MODES and OPTIONS
The A 1760 has three active modes of operation. These include an Audio Delay, a Microphone Recorder and as an Audio
Recorder. These modes are set by the DIP switches as outlined below.
DIP Switches 1 & 2 select the mode.
DIP Switches 3 & 4 select Options 1 and 2 respectively.
Mode 0 : Audio Delay (DIP SW 1= OFF, DIP SW 2 = OFF)
Press and hold any of the PTT triggers to begin and continue recording audio from the Microphone or Music input. The
activity LED should change to GREEN to indicate the unit is recording. A 1 second minimum record time is required. If
the trigger is released within this time period, the recording will be cancelled and the playback will also be cancelled. The
recording is made in mono with a voice tuned AGC (automatic gain control) enabled. Release the PTT trigger to finish
recording. When the recording is finished, the unit will begin playback immediately and the activity LED should change to
BLUE and GREEN. The "Output Active" contacts will close while the recorded message is playing. Once the recording has
finished playback, the LED will change to BLUE to indicate the unit is ready for the next recording. The recorded message is
stored on the Micro SD card for playback at a later date if required (refer to section 6 for more detail).
Option 1 (DIP SW 3) : Pre-chime and Post-chime.
It is possible to play a chime, message, music track or just about any audio file before and/or after a recorded message.
See section 5 for more information regarding the audio files.
Dip switch 3 is used to select this function.
DIP SW 3 = ON, Chimes are played before and after recording playback if files are present in folders (refer to section 5).
DIP SW 3 = OFF, No chimes are played.
Option 2 (DIP SW 4): Not currently used.
Mode 1 : Microphone Recorder (DIP SW 1= ON, DIP SW 2 = OFF)
Press any of the PTT triggers and release to begin recording audio from the Microphone input. The activity LED should
change to GREEN to indicate the unit is recording. Press again to end recording. If the recording is for less than 1second
the recording is cancelled. Holding the PTT trigger will result in constantly attempting to begin, and subsequently cancel-
ling recording, which may leave the unit recording when unintended. The recording is made in mono with a voice tuned
AGC enabled. Once recording has finished no further action is taken. i.e there is no audio playback and the activity LED
will change to BLUE to indicate the unit is ready for the next recording. The recorded message is stored on the Micro SD
card for playback at a later date if required.
Option 1 (DIP SW 3): Audio Pass Through
DIP SW 3 = ON
Audio is passed through IN to OUT while recording.
The "Output Active" contacts will close while the audio is passed through.
DIP SW 3 = OFF
No audio is output
The "Output Active" contacts will remain open.
Option 2 (DIP SW 4): Not currently used.
Mode 2 : Reserved (DIP SW 1= OFF, DIP SW 2 = ON)
Not currently available.
Mode 3 : Audio Recorder (DIP SW 1= ON, DIP SW 2 = ON)
Press any of the PTT triggers and release to begin recording audio from the Music input. The activity LED should change to
GREEN to indicate the unit is recording. Press again to end recording. If the recording is for less than 1second the record-
ing is cancelled. Holding the PTT trigger will result in constantly attempting to begin, and subsequently cancelling record-
ing, which may leave the unit recording when unintended. The recording is made in stereo with no AGC enabled. Once
recording has finished no further action is taken. i.e there is no audio playback and the activity LED will change to BLUE to
indicate the unit is ready for the next recording. The recorded music is stored on the Micro SD card for playback at a later
date if required.
Option 1 (DIP SW 3): Audio Pass Through
DIP SW 3 = ON
Audio is passed through IN to OUT while recording.
The "Output Active" contacts will close while the audio is passed through.
DIP SW 3 = OFF
No audio is output
The "Output Active" contacts will remain open.
Option 2 (DIP SW 4): Not currently used.
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