AMR radiotelephone network (Czechoslovakia)

Technical features

• The complete network has 63 base stations and capacity for 9,999 users.
• Reach of base station was 15 – 25 km, the radiophones were also able to communicate directly with one another.
• Three frequency bands were used: 162/167 MHz for the experimental network, 161/165 MHz for the country level network and 152/157 MHz for local networks.
• Fixed monthly payment tariff was used, 1000 Kčs per month in 1990, because the system was unable to record call details.
• Authentication of the users was added only in 1993.
• There was no encryption of the transmission and it was possible to listen to the traffic on any tuned receiver.
• The only services provided were incoming and outgoing voice calls within the country.