Alphatron ALPHACALL MF, Руководство по установке и эксплуатации

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ALPHACALL MF manual version 1.0 Page 11 of 22
ALPHACALL MF
3.3.1 Terminating the cables
The ALPHACALL MF must be connected in accordance with the instructions in the Appendix.
When designing the ALPHACALL MF, careful attention has been given to the sound quality.
To guarantee this quality in the installed system, here are some recommendations regarding
the grounding of the system:
‰
Prevent ground loops, make one central ground point.
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The main unit must be grounded.
‰
The shielding of the power supply cable must be correctly grounded.
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In addition, connect unused cores of the cables to ground.
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The shielding of the cables to the substations must be correctly grounded.
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Ensure that the cable of the gooseneck is separated from other cables, to prevent cross-talk
and/or acoustic feedback. Note that the ground of the microphone is not connected to the
ship's mass, but to the minus connection of the microphone input.
With respect to the cables to use, the following:
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For the majority of substations, a three-core shielded cable is sufficient.
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Preferably use twisted pair shielded cables for the substations.
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For substations that have a provision for an additional signal indication, at least a five-core
shielded cable must be used. See the Appendix for an overview of the substations.
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Install the cable connections between the devices in accordance with the Appendix.
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If not stated differently, shielded cables with flexible cores must be used with a minimum
core diameter of 0.5mm².
‰
The cabling must not run for long distances next to UTTP or antenna cables that carry high
currents.
For the instrument to operate correctly, it is essential that all of the cables are terminated
correctly.