Digital Alert Systems DASDEC-III Manuale di installazione dell'hardware - Pagina 9
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Digital Alert Systems
industry-standard F-type connectors for each receiver. If not equipped, each radio's F-type connector
will be covered with a cap plug. Review your state's Emergency Alert System Plan for the appropriate
monitoring assignments; these assignments will assist in determining the proper antenna for the
frequencies that need to be monitored.
The EAS device's internal radios are designed to receive the following frequencies:
Band
Frequencies
FM
87.9 - 107.9 MHz
NOAA
162.440 - 162.550 MHz
AM
530 - 1700 KHz
For proper reception, use a good quality, shielded RG6 coaxial cable and connectors. The quality of the
incoming audio signal will affect the operation of the audio decoders, and the quality of the forwarded
audio messages.
Audio Wiring
Overview
The DASDEC-III platform has two types of analog audio: EAS Monitored Audio and Program Audio.
EAS Monitored Audio Inputs feed the internal EAS decoders for processing. Only signals with EAS
information should be directed to these inputs. Program Audio connections are used for internal
switching of program audio.
Program Audio and Monitor 4 Wiring – Analog/AES Digital (optional)
The DASDEC-III utilizes RJ45-style connectors for analog and digital audio. These balanced audio outputs
deliver a continuous audio program stream that switches between the Program Audio inputs and EAS
audio during an alert.
The following wiring diagram illustrates the connections using common T-568B cabling.
Connection diagrams for EAS Monitor Input 4 (DAS3-EX/GX), Analog and AES Program Audio
There are several sources for professionally terminated cables in various lengths and formats. One
excellent source is Studio Hub
Revision 1.0
Min. Input Level
30-40 uV(-80 to -77 dBm)
3-4 uV (-98 to -97 dBm)
2-3 uV (-102 to -98 dBm)
(https://studiohub.com/adapters/)
DASDEC-III Hardware/Installation Guide
Max. Input Level
1mV (-48 dBm)
<500 uv (-55 dBm)
<500 uv (-55 dBm)
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