Radio Systems Millenium-A Analog Console, Installation And Operation Manual

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Radio Systems Millenium-A Console Page 25
Output Board
4.1 Overview
This circuit board provides the following console functions:
Line output amplification
Cue amplification
Headphone amplification
External Inputs
Monitor sends
Meter and peak LED functions
Level sets for all functions
Muting and timer reset functions
Power supply interface
Talk back circuitry
Illustration O-1 provides a complete layout of all connectors, level set locations, and all user connector pin-outs for the
5-pin version console. Illustration O-2 has the same information for the RJ-45 version console
4.2 Audio Circuitry
4.2.1 Program and Audition Outputs
The program and audition outputs provide identical stereo performance, are active balanced, and factory calibrated, with
a 600 ohm load, to p4dBm when the front panel VU meters read “0” VU. This will provide in excess of 20dB of
headroom. Adjustments for output levels, meter calibrates, and peak LED trip points are provided on the Output Board,
so that other output levels maybe set.
The outputs will drive a 600 ohm load or higher. The outputs connectors are mounted on connectors J30 (PGM), and
J29 (AUD), located on the Output Board.
It is recommended that two conductor shielded cable, or two pair shielded cable be used in wiring all balanced audio
inputs to the console. Use STP (shielded twisted pair) patch cords when wiring the RJ-45 version. To minimize RF
interference and ground loops, the shields should be tied to ground only at one end of the cable.
If an unbalanced console output is required, single conductor shielded cable or two conductor shielded cable with a foil
shield around each conductor should be used. The audio should be taken from the + Output terminal, while the shield
should be connected to Ground. In this case, the shield is connected at both ends of the cable. There should be no
connections to the - Output. In this configuration, the console output will provide -2dBm into a 600 ohm load when the
front panel VU meters read “0” VU.
4.2.2 TEL (Telephone) Output
The mono TEL Output is located on connector J33 on the output board.
The two TEL Outputs provided are in parallel, from the same amplifier. The combined load on the amplifier from both
mono sends should be no less than 600 ohms.
In other aspects, the performance and connections to the TEL Output are identical to the PGM and AUD outputs.
4.2.3 External Monitor and Headphone Inputs
Four balanced, stereo, high impedance (4.7K ohm) inputs are provided which feed both the headphone and the monitor
amplifiers. These inputs are located on connectors J19 (EXT IN 1), J20 (EXT IN 2), J25 (EXT IN 3), and J26 (EXT IN 4)
on the Output Board.
Two conductor shielded cable with a foil shield around each conductor or STP RJ-45 patch cords should be used.