Cordless phone was invented by a jazz musician named Teri Pall in 1965. But she could not market her invention because radio signal of two mile range was interfered with aircrafts. The first cordless phones were introduced in 1970s. The FCC or Federal Communications Commission first granted the frequency range of 47-49 MHz for these phones to facilitate less interference and less power to run. The FCC later in 1990, raised this frequency range of 900 MHz. A cordless telephone replaces the handset cord with a radio link.
The handset of a cordless phone communicates with a base station connected to a fixed land phone line. The range of a cordless phone is usually limited to the same building or up to some short distance from the base station. The antenna efficiency is one key factor that enables a greater range of the 900 MHz and 2.4 GHz phones.
Cordless telephones need mains electricity to power its base stations with rechargeable batteries which are charged when the handsets sits in the cradle.
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