Updated rtl_sdr usage notes. Fixed typos. Added note about rtl_433 and r820t2. renamed freenode to libera

1 files changed, 32 insertions, 18 deletions

diff --git a/md/writeup/rtlsdr_usage.md b/md/writeup/rtlsdr_usage.md
index cc43edb..a1440ce 100644
--- a/md/writeup/rtlsdr_usage.md
+++ b/md/writeup/rtlsdr_usage.md
@@ -10,12 +10,14 @@ 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.
 
+As of 2022 the cheap that commonly available is r820t2.
+
 
 ### Get sources
 
 
 Main development repository is on http://sdr.osmocom.org/trac/wiki/rtl-sdr
-on github you can find more repos with experminental 
+on github you can find more repos with experimental 
 features (https://github.com/keenerd/rtl-sdr).
 
 Getting sources from git:
@@ -53,12 +55,12 @@ Check if rtlsdr related drivers is loaded:
 ```bash
   lsmod | grep rtl28
 ```
-If there is some drivers then balcklist driver by creating file
+If there is some drivers then blacklist 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.
+Next thing that could appear is permissions on rtlsdr usage when its plugged in.
 To allow everyone to use create file in */etc/udev/rules.d/* with content:
 ```
   SUBSYSTEM=="usb", ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="2838", \
@@ -68,14 +70,17 @@ To allow everyone to use create file in */etc/udev/rules.d/* with content:
 ### 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
+```
+I like to run rtl_adsb as you can see there that something is received 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.
+There should be line by line showing up some "hex" lines. If some data is shown
+then adsb data from plains is received.
 
 ## Collection of tools  
 
@@ -104,11 +109,11 @@ and then draw image :
 
 ### ADSB
 
-ADS-B ( Automatic dependent surveillance broadcast ) in simple words airplain
-geoposition, speed, height and flight number broadcasting. You can recieve
+ADS-B ( Automatic dependent surveillance broadcast ) in simple words airplane
+geoposition, speed, height and flight number broadcasting. You can receive
 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,
+rtlsdr have default one rtl_adsb programm but it shows only received data,
 without any decoding. Here is dump1090 specifically for rtlsdr and nothing
 more:
 
@@ -139,7 +144,7 @@ and in real time search for some transmission.
 
   http://gqrx.dk/
 
-It have builtin AFSK1200 demodulator or in simple words ham radio packets.
+It have built-in AFSK1200 demodulator or in simple words ham radio packets.
 And you could try to see what people sending in tex around the world.
 
 ### Multimon-ng
@@ -165,18 +170,26 @@ could used for fast prototyping
 Project that make rtlsdr as entropy source, uses FIPS 140-2 standart to
 verify that data is random enought to pass test.
 
+### rtl_433
+
+Generic data receiver. Can use to track remote sensors, weather stations and alot
+other devices.
+
+  https://github.com/merbanan/rtl_433
+
+
 ## Projects where rtlsdr used  
 
 ### 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
+WebSDR probably best site where you can go and click on some radio receiver 
+and listen what happens 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
+If you want setup your own radio reliever read FAQ, prepare mail and send mail
+after that you could receive p recompiled websdr software with is easy
 to setup with rtlsdr stick.
 
 ## Problems 
@@ -189,14 +202,14 @@ To fix that changes for better quality usb cable.
 ### More then 1 dongle
 
 When you run you run usually more then 5 dongles you could get error saying
-something about libusb error (-5) you need to decrese buffer as default one 
+something about libusb error (-5) you need to decrease buffer as default one 
 is (16 * 16384) and it should work
 
 ```bash
 rtl_test -b [NEW_SIZE]
 ```
 
-thx goes to freenode/##rtlsdr chan
+thx goes to libera.chat/##rtlsdr chan
 
 ## Links
 
@@ -207,5 +220,6 @@ thx goes to freenode/##rtlsdr chan
 5. https://github.com/antirez/dump1090
 6. http://gqrx.dk
 7. https://github.com/roger-/pyrtlsdr
-8. https://github.com/EliasOenal/multimon-ng
+8. https://github.com/EliasOenal/multimon-ng  
+9. https://github.com/merbanan/rtl_433