On This Day in Telephone History August 17TH 1951 The First Transcontinental Microwave Telephone Call. AT&T's microwave radio-relay was the first facilities to transmit telephone conversations across the United States by radio rather than wire or cable. Calls were relayed along a chain of 107 microwave towers, spaced about 30 miles apart.

On This Day in Telephone History August 17TH 1951

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On This Day in Telephone History August 17TH 1951 The First Transcontinental Microwave Telephone Call. AT&T’s microwave radio-relay was the first facilities to transmit telephone conversations across the United States by radio rather than wire or cable. Calls were relayed along a chain of 107 microwave towers, spaced about 30 miles apart.

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