Digital data transmission tests on voice channels
Inc. Urban Sciences, United States. National Bureau of Standards. Special publication., National Institute of Law Enforcement and Criminal Justice., Law Enforcement Standards Laboratory. · 1977
To study the transmission and reception of digital data over typical voice channels, a series of tests was performed in Allegheny County, Pennsylvania, using existing local government transmitting sites and a specially equipped mobile unit.Carrier frequency, digital data transmission rate, modulation technique, range of transmission, speed of the mobile unit, and time of day were varied.The tests were conducted in both urban and suburban environments.