Updated May 29, here to go to our page on biological hazards of
radiation New for June 2009! On this page we will (hopefully)
start explaining how cell phones work. If anyone has any
suggestions please send them our way! We are not experts on cell
phones, but that never stopped us from blabbing on and on about
a microwave Most cell phones use GaAs HBT power amplifiers and
pHEMT transmit/receive switches. Silicon germanium may replace
GaAs HBT due to its lower cost some day. Most cell phones
operate around Because cell phones are made with lead-free
processes due to ROHAS, don't expect them to last more than a
few years. This info came from Rick... thanks! CB radios and
walkie-talkies are half-duplex devices. One frequency is used
for talking and listening. This means that only one person can
talk at a time. Cell phones are full-duplex devices which means
that one frequency is used for talking and a separate frequency
for listening. The word "cell" in cell phones comes from the
fact that an area is divided int