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# SDR
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## Softwarově definované rádio
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- Co nejdříve převést signál na digitální
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- Signál zpracovávat programem
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- Složitá matematika a náročné na výkon
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# Signály
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## Základy
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- Co je to signál
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- Co je to modulace
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- AM
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- FM
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- Co je to vzorkování
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- Shannonův theorém
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## Signály kolem nás
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Identifikace signálů na [sigidwiki.com](https://sigidwiki.com)
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Zajímavé rozsahy:
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- 120 - 140 MHz
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- LPKR
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- 156 MHz
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- Metro
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- 440 MHz
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- FM hlas
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- 446 MHz
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- PMR
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- 516, 166-800 MHz
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- Bezdrátové mikrofony
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## Signály kolem nás
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Další věci které lze poslouchat:
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- GSM
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- Airprobe, OsmocomBB
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- Šifrované pomocí A5/1
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- deka
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- GSM-R
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- Vláčky
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- TETRA
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- 420 - 440 MHz
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- Průmyslové GSM
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- Městská olicie, DPP
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- Umé spoustu módů šifrování - všude je mod 0 :)))
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- TERAPOL
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- Policie, armáda
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## Signály kolem nás
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- FM(AFSK)
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- Vlaky
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- Sirény
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- Radiosondy
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Nepříliš dobré řešení, ale levné.
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## Signály kolem nás
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- ACARS, ADS-B
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- Letadla
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- flightradar24.com
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- acarsdec, dump1090
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## Triangulace
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Triangulace
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## Odrazy
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Duchové
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## Hardware
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- BladeRF
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- HackRF
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- AirSpy
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- SDR Play
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- LimeSDR
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- RTL-SDR
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- ...
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## Software
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- rtl_*
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- GNURadio
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- GNURadioCompanion – GUI ke GNURadiu.
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- Gqrx
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- Gqrx-scanner – Frekvenční skener pro Gqrx.
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- Kukuruku – Interaktivní SDR klient od Jendy Hracha.
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- Fldigi
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- Universal Radio Hacker
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- qradiolink – Multimode SDR pro VOIP.
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- SDRangel – Mocný klient pro SDR.
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- SigDigger – SDR klient podobný GQRX, ale nevyužívá GNURadio.
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