MTD (mobile network)
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MTD (Swedish abbreviation for Mobilelefonisystem D, or Mobile telephony system D) was a manual mobile phone system for the 450 MHz frequency band. It was introduced in 1971 in Sweden, and lasted until 1987, when it had been obsoleted by the NMT automatic service. The MTD network had 20,000 users at its peak, with 700 people employed as phone operators.
MTD was also implemented in Denmark and in Norway (from 1976), which allowed roaming within the Scandinavian countries.
In Sweden, the first mobile phone system was MTA (for Mobilelefonisystem A), which was introduced in 1956, and lasted until 1967. It was a 160 MHz system available in Stockholm and Göteborg, with 125 total subscribers. The second system, MTB (for Mobilelefonisystem B), had transistorized mobile sets, was introduced in 1962. and lasted until 1983. It operated in the 76-77.5 and 81-82.5 MHz bands, and was also available in Malmö, and had around 600 subscribers.
In Norway, the first mobile phone system was OLT, introduced in 1966. In 1981 it had 30,0000 subscribers, which made it the worlds largest at the time.
[edit] External links
- Brief description of MTD as well as MTA and MTB (in Swedish)
- Some history behind MTA and MTB (in Swedish)
