Headphone Outputs; Monitor Sends; Control Wiring; Mute And Timer Reset Bus Connections - Radio Systems Millenium-A Analog Console Installation And Operation Manual

Radio Systems Millenium-A Console
These inputs are intended mainly for air signal monitors, or for the connecting of other external monitor sources. Input
level trims for each of these inputs are provided on the Output Board.
4.2.4

Headphone Outputs

Two headphone outputs are provided. The first is available at a stereo, quarter inch, phone jack which is factory mount-
ed to the front panel. This output is capable of driving 8 ohm or greater loads. D0 NOT USE MONO HEADPHONES.
The output signal is selected by the front panel headphone or monitor switches and level adjusted by the front panel
headphone level control.
The second headphone output is stereo, balanced, and high level (lv RMS typical). It will drive loads of 2K ohms or
greater. This output, which is intended for connection to an external headphone amplifier, follows the input selection
switches but is not affected by the front panel headphone level control.
The connector for the headphone output is located on J11 on the output board.
Single conductor shielded cable or two conductor shielded cable with a foil shield around both conductors should be
used.
4.2.5

Monitor Sends

Three stereo, balanced, high level (lv RMS typical) are provided. Each output will drive loads of 2K ohms or greater.
The outputs are Dimmed
Monitor (controlled by Mute 1), Muted Monitor (controlled by Mute 2), and Unmuted Monitor. All outputs follow the moni-
tor selection switches but only the Dimmed Monitor is affected by the front panel monitor level control.
Connectors are located on the Output Board as follows.
Output Board Header
J12
J15
J16
Single conductor shielded cable or two conductor shielded cable with a foil shield around both conductors, or STP RJ-45
patch cords, should be used.
All monitor outputs are intended to drive external monitor amplifiers. The Dimmed Output, controlled by Mute 1, (which
also mutes the Cue speaker) is intended to feed the control room monitor amplifier where the console is located. When
the Mute 1 bus is enabled, the output from the Dimmed Output will be reduced to a level set by VR13 located on the
Output Board. This level may be set to maximize (for full muting) or, alternatively, to a level just below the feedback
threshold of the speakers.
The Muted Output is intended to feed any other room which that contains microphones connected to the console.
If it is desirable to feed all studios from a common amplifier, this amplifier should be fed from the Unmuted Monitor Out-
put. External relays driven by the muting contacts on header J7 could then be used to provide the necessary muting of
the signal.
4.3

Control Wiring

4.3.1

Mute and Timer Reset Bus Connections

A five position quick-connect type barrier strip maybe mounted onto Mute/Timer header J7 on the Output Board to pro-
vide external mute and timer reset functions.
The bus outputs are open collector current sinking outputs, maximum +24vdc open circuit voltage, 80ma. If the buses
are to drive external relays, install EMF suppression diodes across the relay coils. Do not exceed 150ma draw from the
+15v supply.
An interface relay is optionally available from Radio Systems. Illustration O-3 shows the wiring of this relay for external
tally lights.
The Timer Reset Bus activates only during the first 100ms after a mixing channel, with its Timer Reset Jumper(s) in-
stalled, is placed in the "on" mode. Repeated depressing of the "on" switch after the mixing channel has turned "on" will
result in additional pulses on the Timer Reset Bus.
Monitor Output
Dimmed Monitor (Mute 1)
Muted Monitor (Mute 2)
Unmuted Monitor
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