Inventor- Martin Cooper
DynaTAC- “Dynamic Adaptive Total Area Coverage.” It was the first handheld mobile phone.
The Motorola DynaTAC 8000X commercial portable cellular phone received approval from the U.S. FCC on September 21, 1983.
|Charging Time||– 10 hours|
|Talk Time||– 30 minutes|
Its memory could store 30 phone numbers at a time, also offered an LED display for dialing or recall of one of 30 phone numbers. It was priced at $3,995 in 1984, its commercial release year, equivalent to $9,634 in 2018.
While Motorola was developing the cellular phone itself, during 1968–1983, Bell Labs worked on the system called AMPS, while others designed cell phones for that and other cellular systems. Martin Cooper, a former general manager for the systems division at Motorola, led a team that produced the DynaTAC 8000x, the first commercially available cellular phone small enough to be easily carried, and made the first phone call from it. Martin Cooper was the first person to make an analog cellular mobile phone call on a prototype in 1973 but it was available in the market in 1983.
The Motorola DynaTAC 8000x was very large compared to phones today. This first cell phone was very expensive when it was released in the USA in 1984. The DynaTAC’s retail price, $3,995 (about $10000 in 2018), ensured that it would not become a mass-market item; by 1998, when Mitchell retired, cellphones and associated services made up two thirds of Motorola’s $30 billion in revenue.
Several prototypes were made between 1973 and 1983. The product accepted by the FCC weighed 28 ounces (790 g) and was 10 inches (25 cm) high, not including its flexible “rubber duck” whip antenna. In addition to the typical 12-key telephone keypad, it had nine additional special keys:
- Rcl (recall)
- Clr (clear)
- Snd (send)
- Sto (store)
- Fcn (function)
- Pwr (power)
- Vol (volume)
U.S. Patent 3,906,166, September 16, 1975 for a Radio Telephone System. the cell phone. Martin Cooper, Richard W. Dronsurth, Albert J. Leitich, Charles N. Lynk, James J. Mikulski, John F. Mitchell, Roy A. Richardson, and John H. Sangster.
N.B. Two names were botched in the original filing; Albert Leitich’s surname was erroneously omitted, and Dr. Mikulski’s first name was omitted. The original document was refiled by Motorola’s legal staff, but has not yet been identified.
The DynaTac 8000X, due to its resemblance in size and weight to a standard clay-fired brick, was nicknamed the brick phone by users, a term later applied to other brands as a contrast to smaller handsets appearing in the 1990s.
While it might be considered extremely unwieldy by modern standards, at the time, it was considered revolutionary because mobile telephones were bulky affairs installed in vehicles or in heavy briefcases. The DynaTAC 8000X was truly the first mobile telephone which could connect to the telephone network without the assistance of a mobile operator and could be carried about by the user.
Motorola offered a one-hour desktop charger, though the battery could get quite hot while charging at this accelerated rate. In some cases, this could cause major problems with the battery, occasionally short circuiting it and rendering it unusable. Also, charging the battery at a high enough rate to substantially raise its temperature will cause the battery to wear at an accelerated rate, reducing the number of charge-discharge cycles that can be performed before the battery will need to be replaced. (However, considering the high cost of the DynaTAC, the cost of battery replacement would not typically be a concern to DynaTAC owners.)