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KF5JRV > TECH 11.05.16 12:25l 9 Lines 424 Bytes #999 (0) @ WW
BID : 2757_KF5JRV
Read: GUEST
Subj: Improved Modem
Path: IZ3LSV<IK6ZDE<F1OYP<F1OYP<KQ0I<N0KFQ<KF5JRV
Sent: 160511/1122Z 2757@KF5JRV.#NWAR.AR.USA.NA BPQ1.4.65
An Improved Modem 1958
Though modems existed for teletype since the 1940s, these transmitted
at speeds of about 150 bpi. To meet demands of the U.S. military, in
1958 researchers at Bell Labs developed an improved modem
(modulator-demodulator), using amplitude magnification to provide a way
to convert digital signals to analog signals and back for transmission
at speeds up to 1600 bpi over analog telephone lines.
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