Rtl Sdr_setting

RTL-SDR Setting

rtl-sdr

RTL-SDR:
Way to turn a cheap TV tuner into a device that can pick up a wide range of radio signals
-These TV tuners are usually used to watch digital TV on a computer and are based on a specific type of chip made by Realtek(RTL2832U)
-What makes them special is that this chip can send the raw radio signals it receives directly to a computer
-Originally, this feature was meant for listening to digital radio broadcasts (like DAB, DAB+, and FM)
-The idea to use these TV tuners as general-purpose radio signal receivers (or software-defined radios - SDRs) was first discovered by someone named Eric Fry. Another person, Antti Palosaari, often mistakenly credited with this discovery, actually didn’t have a role in starting the RTL-SDR project
Footnote:
Radio signal:
A kind of invisible wave that carries information (like music or voice) from one place to another
To pack as much information as possible into this wave and then unpack it at the other end, scientists use a clever trick by splitting the information into two parts and mixing it with the wave in two different ways I/Q Samples:
I/Q stands for In-phase/Quadrature
In radio communications, signals can be represented as a combination of two separate components:
“In-phase” component(I):
Varies in phase(Step)
“Quadrature” component(Q):
Varies in amplitude, 90 degrees out of phase
These components are used to encode the signal’s information.

임포티먼트 데이터 센터

DVB-T dongles based on the Realtek RTL2832U can be used as a cheap SDR, since the chip allows transferring the raw I/Q samples to the host, which is officially used for DAB/DAB+/FM demodulation. The possibility of this has been discovered by Eric Fry (History and Discovery of RTLSDR). Antti Palosaari has not been involved in development of rtl-sdr.

Reference:
https://osmocom.org/projects/rtl-sdr/wiki