This video shows amateur radio trans-continental communications using an Icom NXDN digital voice transceiver.
NXDN equipment is manufactured by both Icom and Kenwood and uses 4-FSK modulation, also known as C4FM.
The YouTube description reads:
This one of the first trans-continental NXDN communications via amateur radio. You are listening to KI4SWY repeater located in New Port Richey, FL, its is full time linked to River view, FL, Atlanta, GA, Cleveland, OH, and now Vancouver (Canada).
Watch ICOM NXDN (Tampa , Atlanta, New Port Richey, Vancouver, Cleveland Link)
2005 Icom and Kenwood demo 'Very Narrowband Digital Communications Technology'
http://www.southgatearc.org/news/apr2005/icom_kenwood_demo.htm
Source: http://www.southgatearc.org/news/august2012/amateur_radio_nxdn_communications.htm
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