A logarithmic unit that can be used to measure ratio
dBm
A unit of measurement used to indicate the ratio of a power level with respect to a fixed reference level (1mW)
Bel
One-tenth of a decibel
Electronic Communication System
Its fundamental purpose is to transfer information from one place to another
Electronic Communication
The transmission, reception, and processing of information between two or more locations using electronic circuits
Analog signals
Are time-varying voltages or currents that are continuously changing such as sine and cosine waves
Attenuation
Is sometimes referred to as a power loss
Unity Power Gain
Is sometimes referred to as a, If Pout = Pin, the absolute power gain is 1, and the dB power gain is 0 dB
Digital signals
Are voltages or currents that change in discrete steps or levels
Telephone
In 1876, Alexander Graham Bell and Thomas A. Watson were the first to successfully transfer human conversation over a crude metallic- wire communications systems using this device
KDKA
The first commercial radio broadcasting station in 1920 that broadcasted amplitude modulated signals in Pittsburgh
Decibel (dB)
Is a logarithmic unit that can be used to measure ratio
dBm
Is a unit of measurement used to indicate the ratio of a power level with respect to a fixed reference level (1mW)
