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-# RTLSDR usage
-
-# Index
-
-
-1. Setup rtlsdr
- 1.1. Get sources
- 1.2. Drivers
- 1.3. Check if works
-2. Collection of tools
-  2.1. FM
-  2.2. Spectrum diagram
-  2.3. ADSB
-  2.4. AFSK1200
-3. Projects where rtlsdr used
-  3.1. WebSDR
-4. Problems
-  4.1. Sync errors
-5. Links
-6. Changelog
-
-
-## 1.Setup rtlsdr
-
-
-By rtlsdr usually call RTL2832U chip based tv-tunners which
-can be used for not just recievin DVB-T frequencies but much more
-and yes price is ~$10 it mean that anyone can just buy and try
-without "loosing" money.
-
-
-### 1.1.Get sources
-
-
-Main development repository is on http://sdr.osmocom.org/trac/wiki/rtl-sdr
-on github you can find more repos with experminental 
-features (https://github.com/keenerd/rtl-sdr).
-
-Getting sources from git:
-```
-  git clone git://git.osmocom.org/rtl-sdr.git
-```
-I prefer using plain binaries without any kind of installation. Just
-compile and use binary without any troubles.
-Build:
-```bash
-  cmake .
-  make
-```
-All binaries is in src dir
-
-
-### 1.2.Drivers
-
-
-Linux kernel have some drivers for rtlsdr stick and DVB-T. When you will plug
-rtlsdr then kernel probably will load DVB-T drivers and you will not able
-to use you rtlsdr for sdr. Way yo fix is it add some drivers to black list and
-next time when you will plug rtlsdr this drivers will not be loaded.
-
-Check if rtlsdr related drivers is loaded:
-```bash
-  lsmod | grep rtl28
-```
-If there is some drivers then balcklist driver by creating file
-in */etc/modprobe.d/* with content:
-```
-  blacklist dvb_usb_rtl28xxu
-```
-Next thing that could appear is permissions on rtlsdr usage when its pluged in.
-To allow everyone to use create file in */etc/udev/rules.d/* with content:
-```
-  SUBSYSTEM=="usb", ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="2838", \
-  GROUP="adm", MODE="0666", SYMLINK+="rtl_sdr"
-```
-
-### 1.3.Check if works
-
-How to test if rtlsdr works? Run one of commands:
-  rtl_test
-
-I like to run rtl_adsb as you can see there that something is recieved and
-you see that everything "works":
-  rtl_adsb
-
-There should be line by line showing up some "hex" lines. If some data is showen
-then adsb data from plains is recieved.
-
-## 2.Collection of tools  
-
-
-### 2.1.FM
-
-Get some sound trancmited from FM radio stations.
-
-```bash
-  rtl_fm -f 96.3e6 -M wbfm -s 200000 -r 48000 - | aplay -r 48k -f S16_LE
-```
-
-
-### 2.2.Spectrum diagram
-
-Scan spectrum to find some activities on different frequencies.
-Good link with all description is http://kmkeen.com/rtl-power/ . 
-Main usage of rtl_power is :
-```bash
-  rtl_power -f 76M:108M:125k -i 1 fm_stations.csv
-```
-and then draw image :
-```bash
-  heatmap.py fm_stations.csv fm_stations.png
-```
-
-### 2.3.ADSB
-
-ADS-B ( Automatic dependent surveillance broadcast ) in simple words airplain
-geoposition, speed, height and flight number broadcasting. You can recieve
-this data and see how many plains is around and sometimes flight number.
-
-rtlsdr have default one rtl_adsb programm but it shows only recieved data,
-without any decoding. Here is dump1090 specifically for rtlsdr and nothing
-more:
-
-  https://github.com/antirez/dump1090
-
-description howto install could be found also here
-
-  http://www.satsignal.eu/raspberry-pi/dump1090.html
-
-Using in interactive mode with height in metrs:
-```bash
-  dump1090 --interactive --metric
-```
-Output:
-
-```
-  Hex    Flight   Altitude  Speed   Lat       Lon       Track  Messages Seen .  
-  ------------------------------------------------------------------------------
-  71be01          10052     1009    36.434    33.544    45    9         1 sec
-  424913 SDM6329  10966     711     36.440    33.405    221   65        0 sec
-```
-
-
-### 2.4.AFSK1200
-
-Gqrx is graphical SDR software where you can travel across frequencies
-and in real time search for some transmission.
-
-  http://gqrx.dk/
-
-It have builtin AFSK1200 demodulator or in simple words ham radio packets.
-And you could try to see what people sending in tex around the world.
-
-## 3.Projects where rtlsdr used  
-
-### 3.1.WebSDR
-
-WebSDR probably best site where you can go and click on some radio reciever 
-and liste what happends in some particular country. WebSDR site contains
-about 80 radio recievers around the world that can be accessed trought web
-interface. 
-  http://websdr.org/
-
-If you whant setup your own radio reciever read FAQ, prepare mail and send mail
-after that you could recieve precompiled websdr software with is easy
-to setup with rtlsdr stick.
-
-## 4.Problems 
-
-### 4.1.Sync errors
-
-Once there was sync error when was trying to use rtl_test or rtl_adsb.
-To fix that changes for better quality usb cable.
-
-# 5.Links
-
-1. [http://kmkeen.com/rtl-demod-guide/](http://kmkeen.com/rtl-demod-guide/)
-2. http://kmkeen.com/rtl-power/
-3. http://sdr.osmocom.org/trac/wiki/rtl-sdr
-4. http://www.rtl-sdr.com/
-5. https://github.com/antirez/dump1090
-6. http://gqrx.dk
-