Test #8 Flashcards
Signal
The message or data. Sent as a wave or light
Antenna
A thing designed to create and receive waves
Transmitter
Sends the signal- by moving electrons to create a wave or light
Receiver
Gets the signal- by having the waves move the electron in the antenna and decoding the signal
Analog signal
Shape of the wave holds this information
Digital signal
Message is coded as zeros and ones
Analog pros
Further distance, simple to create and receive
Analog cons
More interference, less info, hard to store/repeat
Digital pros
More information quickly, easy to store/copy, less interference
Digital cons
Less distance, need a processor to decode
CPU
Central processing unit- main brain of the computer and enacts the code
GPU
Graphic prossesor unit- makes codes visible
RAM
Short term memory- used to make machine run
Hardrive/SSD
Long term memory
Solid state drive
Like ram but for longer period of times
Hardrives
Spinning magnetic discs
how does an antenna receive a signal
the electromagnetic wave passing over the antenna induces a small voltage
what carries a wireless signal
radio waves
what does a transmitter do to create a signal
generate a carrier frequency which is then combined with the data signal and emitted
what parts of the electromagnetic spectrum does most wireless transmission take place in
20 KHz to 300 GHz
