Overview
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MSRA & MSRA-RM Multi-Station Relay Adapter
The Multi Station Relay Adapters (MSRA & MSRA-RM) are a microprocessor based, three stereo channel accessory for the DASDEC™ EAS/CAP encoder-decoder, allowing a single unit to expand the number of individually controlled stations from a one to up to a total of four. All commands and EAS audio are supplied by the DASDEC™, and the MSRA interprets these commands to select the appropriate station (or stations) for EAS broadcast.The MSRA connects to the DASDEC™ rear panel via the supplied RS232/audio cable along with the EAS audio from the “Auxiliary Audio Output” connection. The MSRA provides a multi-turn recessed front panel “ Input Gain” trim potentiometer and multi-turn individual “Station Gain” controls for controlling the active stereo distribution amplifier sections with balanced output levels capable of greater than +12dBm into a 600 ohm load impedance. A recessed front panel “Test” switch provides a handy aid for setting audio levels.An optically isolated open collector “Tally” output for user control applications is provided and is active when any or all of the 3 MSRA controlled stations are activated, and remains active until the end of the EAS activation.
The MSRA is transparent to program audio due to it’s loop-through design, and uses 6 high quality bifurcated gold over silver nickel contact sealed relays, one relay for each left and each right channel circuit. The MSRA also is designed to remain transparent to program audio during any power failure condition. All station inputs and outputs are connected using large 5mm Eurostyle screw type pluggable connectors for wiring ease and connection reliability. The internal power supplies, precision regulators, precision audio distribution amplifier sections and quality components throughout assure long life and trouble free operation of the MSRA. No external power supplies (wall warts) are required. Front panel LED indicators are provided for “Power” and “Station” left and right audio relay activation during an EAS event.
