Redback A 5131 User manual
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Redback® A 5131 Priority Mixer
Operating Manual
A 5131 Priority MIxer
Description
This four channel mixer features 4 balanced mic inputs and 3 line inputs. Input 1 is a dedicated balanced mic input whilst
inputs 2 - 4 can accept either balanced mic or line level.
Priorities
3 modes of priority are selectable via the DIP switches on the rear:
Cascade: Input 1 overrides 2-4, Input 2 overrides 3-4, Input 3 overrides 4.
FIBD: First In Best Dressed - Regardless of which input is being used, it automatically blocks out all other inputs.
MIxed: No priority therefore all inputs will be mixed as per a normal mixer.
Muting
The system can be congured for PTT muting which operates only with microphone inputs, or VOX muting which
operates with both microphone and line inputs. This function is switch selectable via the rear panel DIP switches.
(See DIP Switch settings).
Phantom Power
Each microphone input has the option for phantom power (+12V DC). The phantom power is activated for all microhone
inputs via jumper JP5 located inside the unit. (Refer to Fig 2).
System Busy
Euro block terminals are included for remote LED indication that the system is busy. For the input in use the LED is in a
steady illuminated state. For all other inputs the LED’s ash indicating the system is busy and in use. The corresponding
LED on the front panel also illuminates indicating the active channel.
The LED’s operate both with microhpne and auxilliary input signals with either the PTT or VOX muting options selected.
The remote busy indicator voltage can be selected internally to 1.5V DC for driving LED’s direct ,or 12V DC for driving
incandescent lamps.
VOX sensitivity
The sensitivity of the VOX circuit can be adjusted via the trimpots located on the front of the unit. Each input has its own
dedicated adustment trimpot. If the Vox circuit needs to be turned off for a particular input, turn the corresponding
trimpot fully anti-clockwise.
Features
• 4 balanced microphone / 3 line inputs • 3 modes of priority Cascade, FIBD,Mixed • VOX or PTT muting
• Channel active indicators • VOX muting or both mic and line inputs • 24V DC operation
• Adjustable VOX sensitivity for each input• Separate volume for each input • 24V DC plugpack included
User manual revision number 1.4 25/10/2021
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Redback® A 5131 Priority Mixer
Front Panel Controls
Each input is equipped with a volume control and channel active LED indicator. LED’s are provided to indicate power, mode
of priority ie Cascade, FIBD, or Mixed plus the type of muting. i.e. PTT or VOX.
Fig 1
1 Volume Controls
Each input has its own dedicated volume control.
2 Input Active LED
These LED’s indicate which input is currently active, with a steady indication. All other input LED’s ash to indicate
the system is busy.
3 VOX sensitivity controls
Each input has its own VOX sensitivity adjustment trimpot.
4 VOX/PTT Indicators
These LED’s indicate if the unit has VOX or PTT muting active. Selectable via DIP Switches (Refer DIP SW settings).
5 Priority Indicators
These LED’s indicate which priority mode the unit is running in, if muting has been enabled via DIP switch 1.
Internal Jumper Settings
Phantom Power
Jumper JP5 is used to activate phan-
tom power. Once activated 12V DC
will be provided to the hot and cold
terminals of all four of the microphone
input connectors.
System Busy - Switched Out
Voltage
Each channel has a corresponding
‘switched out’ set of terminals which
can be used for remote monitoring.
The voltage output on these terminals
can be set to either 1.5V DC for direct
driving of an indicator LED or 12V DC
for driving incandescent lamps. A set
of jumpers has been provided for each
output.
Fig 2
Power
On
Cascade
FIBD
Mixed
PTT
VOX
Input 1
Vox
Sens.
Input 2
Vox
Input 3
Vox
Input 4
Vox
Sens. Sens. Sens.
Timer
Priority Mixer
A 5131
1
23 4 5
0
2
46
8
10
0
2
46
8
10
0
2
46
8
10
0
2
46
8
10
Phantom power
jumper
Jumpers select switched out
voltage. 1.5V DC or 12V DC.
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Redback® A 5131 Priority Mixer
Inputs and Outputs
Microphone connections are via 5 way pluggable euro block and line connections are via stereo RCA sockets (converted
to mono internally). Two outputs are provided, one for balanced output (level selectable 3mV or 1V via the rear panel DIP
switches ) and one for line level.
Fig 3
1 Line Level Inputs
Auxilliary RCA inputs are available on channels 2,3 and 4. These are nominal 1V inputs which are internally
mixed to become a mono signal.
2 DC Input
Power is supplied to the unit via a 2.1mm (tip to positive) DC socket. The input voltage must be between
24-28V DC.
3 DIP Switches
These switches congure the priority mode, muting options and the mic output sensitivity.
(Refer to DIP Switch settings for more detail).
4 Mic Output
This is a balanced microphone output with adjustable level of 3mV or 1V.
5 RCA Stereo Line Output
A iine level output of 1V (Note: Left and right channels carry the same output signal. This is not stereo output).
6 PTT and Switched Out
Connects via Euroblock screw terminals. The switched output terminal can be used for remote monitoring, and
becomes active when the correspnding input is active. The output can be set to 1.5V DC or 12V DC for driving
LED’s or Incandescent lamps.
The PTT terminal is for use with microphones with the PTT (Pust To Talk) option.
7 Mic In
Euro block screw terminals are provided for the microphone inputs. These are a balanced input with a hot, cold
and gnd connection. Connection can be made using screened cable such as the w 3032.
Mic 4
Manufactured in Australia
By Altronic Distributors Pty. Ltd.
24VDC
Input
+
-
Line Out
www.altronics.com.au
DIP Switch Settings
SW ON OFF
1
2
PTT Mute
3
Cascade
4
Mic Out 3mV
Mute On Mute O
VOX Mute
FIBD
Line 4 Line 3 Line 2
Mic 2 Mic 1
+-
+-
+- +-
Mic 3Mic Out
L
R
L
R
L
R
PTT
PTT
PTT
PTT
Sw. Out
Sw. Out
Sw. Out
Sw. Out
+-
L
R
Mic Out 1V
1 2 3 4
2
1
3 4 5 6 7
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Redback® A 5131 Priority Mixer
Cable Requirements
Connection details for balanced microphone inputs with PTT switch and busy LED indicator.
Fig 4
DIP Switch settings
The DIP switches on the rear of the unit congure the Priority mode, muting options and the Mic output sensitivity.
Switch 1 is set ON to enable muting and OFF to disable muting
Switch 2 is set ON to enable PTT muting and OFF to enable VOX muting
Switch 3 is set ON to enable Cascade priority and OFF to enable FIBD priority
Switch 4 is set ON to set the Mic Output Sensitivity to 3mV and OFF to set the Mic Output Sensitivity to 1V
Troubleshooting
NO Power (Power LED does not illuminate):
Check power supply DC jack is 2.1mm and not 2.5mm size.
Power supply voltage is 24-28VDC.
Power supply is a DC output, not AC.
Hot +
Cold -
Earth
PTT Switch
Busy Light 12V or 1.5V DC
MIC
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