In this article we will talk about the first car phone which was a great way in the modern technology of invention the mobile phones. The journey of the car phone is quite interesting one needs to keep track of the events that were happening around that time then one can easily analyze how important was the role of a particular technological development in that particular time. Let’s look at this wonderful machine which was important at one point in time.
Timing Of The First Car Phone
In the advent of the second world war, this kind of radiotelephone became very important in connecting Armies because many countries sent their armies to the battlefield and it was really important to coordinate with the allies. A particular radiophone was able to do the work. After the war, the threat of cold war and communism started looming. Countries particularly of the capitalist block tried to increase their surveillance mechanism and the car phones were also one of the ways.
After the use in the military and in police the car phone proved it’s used in other important areas. The companies envisioned two forms of mobile telephone service, “HIGHWAY” and “URBAN.” Both would be VHF, and both would use FM. The “Highway” service, as its name implies, was intended primarily to serve the major land and water routes that existed across the United States in the 1940s, which would not be served by the “Urban” systems. Highway service was intended for trucks and barges on inland waterways rather than private vehicles.
The Highway Service
Highway service was allocated 12 channels in the VHF “low band,” with the mobile equipment receiving on 35 Megacycle and transmitting on 43 Megacycle frequencies, although not all 12 channels were initially used. The Urban equipment, as its name implies, was intended to serve mobile subscribers whose travels took them primarily within the immediate radius of a major urban canter, such as doctors, delivery trucks, ambulances, newspaper reporters, and so forth.
Urban equipment operated on VHF 152 Megacycles (receive) and 158 Megacycles (transmit,) and the initial FCC allocation in 1946 was for 6 channels. The separation in transmit and receive channels was necessary to provide a “half-duplex” communications circuit and allowed the telephone company base station to remain on the air continuously during the duration of the call. The first Highway system went on the air on August 28, 1946, in Green Bay, Wisconsin, and the first Urban system went on the air in Saint Louis on June 17, 1946. This kind of networking made possible the invention of the modern mobile phones.
By 1948, Urban service was available in 60 cities in the United States and Canada, with 4000 mobile subscribers, handling 117,000 calls per month. Highway service was in place in 85 cities with 1900 mobile subscribers, handling approximately 36,000 calls per month, with most major highways in the east and Midwest covered.
One can understand how much car phones helped to grow America with this simple above-said data only. This was an important step in imagining the invention of mobile phones because for the first time one was able to take signals while driving. That was the car phone for you.