Explore: Telephone Repeaters

Telephone repeaters were the first type of repeater and were some of the first applications of amplification. The development of telephone repeaters between

and Australian forces during the war. Built in 1941 and 1942, the Telephone Repeater Station and Powerhouse, relocated in 1946, were a result of the military's

as early telephone repeaters, making long-distance phone calls possible in the era before vacuum tubes. Called a Brown's relay, these repeaters worked by

amateur radio, repeaters are typically maintained by individual hobbyists or local groups of amateur radio operators. Many repeaters are provided openly

6J6. The 2C51 had been developed by Bell Labs for use in undersea telephone repeaters and had about 5 times the life (for 6 times the cost). This decision

low-power repeaters) (1997) Televisions: 52,000 (1997) Internet service providers (ISPs): 1 (1999) Country code (Top level domain): NC Telephone numbers

speeds. The old Shreeve electroacoustic carbon repeaters were used in adjustable amplifiers in telephone subscriber sets for the hearing impaired until

broadcast stations: 228 (plus 2,112 repeaters); note - these figures include 11 television broadcast stations and 89 repeaters in the Canary Islands (September

used in telephones from 1890 until the 1980s. Carbon microphones can be used as amplifiers. This capability was used in early telephone repeaters, making

"Lawrence Shop" that was occupied in 1957 produced BELLBoy receivers, telephone repeaters and carrier products under Merrimack Valley Works. The "Clark Shop"