A portable radio bridge which allows most two-way radios to be interconnected regardless of the radio's frequency, modulation or encryption scheme to provide radio interoperability at the scene of a multi-jurisdictional emergency. The device channels the audio output from the external speaker jack on one radio to the microphone input jack on another radio. The process used is time division multiplexing. The device is microprocessor controlled and monitors input channels, determines if someone is speaking, and sends the audio to output channels in specified “talk groups”.
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