Dual Radio Interface

Features

• Simultaneously transmits over two radios for dual-frequency broadcasts.
• Combines the HoldOff signal from each radio, preventing radio transmissions if either channel is busy. If a channel remains busy for an extended period, the NG/NG² employs HoldOff logic to transmit at an appropriate time.
• The defect detector listens for DTMF tones from Radio-1 to provide the Rebroadcast feature that repeats the last announcement to the train crew.
• A HoldOff LED indicates that one or both radios are busy receiving radio traffic.
• A PTT LED indicates when the unit provides both radios with the Push-to-Talk signal.
• The Power LED indicates that the defect detector supplies power.

Features Complementing Ritron DTX-160 Radios

• The Ritron DTX-160 connected to the Radio-1 connector is programmable using the serial interface of the SmartScanNG².
• Two eight-position selector switches provide channel selection for each radio.
• The power supply input is reverse-polarity protected and used to power the Ritron radios through the interface cables.