Radio Systems Millenium-D, Инструкция по установке и эксплуатации

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Radio Systems Millenium-D Digital Console Page 19
Six Channel Audio Mother Board
3.1 Input Connectors
The Millenium digital console may be ordered factory equipped with either 5-pin removable barrier strip connectors or
RJ-45 style connectors. RJ-45 connectors are wired to the St audio standard. Both connectors accommo-
date either mono or stereo balanced or unbalanced analog connectivity or balanced AES-EBU or unbalanced S/PDIF
connections. Illustrations C-3 and C-4 show the location of these various input audio connectors.
3.2 Input Configurations
One six-channel input board is provided per six console inputs and mounted on the lower inside pan of the console.
The Six Channel Input Audio board houses up to six plug-in analog or digital daughter cards. These plug-in cards
configure both inputs of any channel to accept either analog (stereo mic thru line level) or digital (stereo AES-EBU or
S/PDIF) signals. Cards can be plugged into any slot and no hardware or software programming is necessary for the
console to “recognize” an analog or digital card.
3.2.1 Input Wiring
Every input, from mic thru high level, wires to the input connectors. One 5 pin connector or one RJ-45 connector is
provided for each channel “A” input and another is provided for each “B” input. Each connector handles left and right
balanced audio or stereo AES-EBU or S/PDIF digital audio from the source equipment.
The connectors also provide a grounding point for the audio inputs. Grounds should be connected at either the con-
sole or equipment and not at both ends, to avoid ground loops. The console is usually used as the grounding refer-
ence point.
See section 1.4.6 “grounding and shielding” in the ‘Installation, Wiring and Operations” section for more information.
3.3 Analog Daughter Cards
The universal, dual input, analog plug-in cards accommodate stereo or mono, balanced or unbalanced, low or high
(bridging) impedance, mic thru line level inputs. Any combination of these signals can be applied to the A or B inputs.
Various wiring configurations and jumpers program the cards to accept these different signal types.
3.3.1 Unbalanced Analog Audio
If an unbalanced analog audio source is to be connected to the console, single conductor shielded cable or two con-
ductor shielded cable with a foil shield around each conductor should be used. The audio should be connected to the
+ input, while the shield should be connected to both the - input and Ground. In this case, the shield is connected at
both ends of the cable.
3.3.2 Analog Mono Inputs - for Mic and Line Level
To connect an analog input so that it feeds both the left and right channels, connect the + Left Input to the + Right
Input, and connect the - Left Input to the - Right Input. The source will not be loaded, due to input impedance of 20K
ohms for high-level inputs and 4.5K ohms for microphone inputs. Inputs jumper programmed for mic level are automati-
cally set to mono with the left channel summed to both left and right.
3.3.3 Input Sensitivity
Input levels can be independently programmed for A&B inputs via on board jumpers. Jumpers are provided for 9 mic
gain settings, as well as +10 and +20 gain boost to line level inputs to accommodate low-level (consumer type) outputs
without the need for external matching amplifiers. Consult illustration C-1 for jumper locations.
Input levels can be pre-trimmed or boosted in console software in .1 dB
steps over a 25 dB range. Consult the “Channel Settings” page in the “Soft-
ware” section of this manual for more information.