11:59 < gordonjcp> kdag: I think you put the frequency as something like 2000M:2200M
11:59 < charolastra> not with rtl_sdr; you're talking about rtl_fm
11:59 < charolastra> for plain visualisation you could also try rtl_power
12:00 <@ifreq>
12:04 < kdag> gordonjcp: great to know is possible, couldn't read on the --help
12:05 < kdag> just read is rtl_fm
12:05 < kdag> and power
12:05 < kdag> tx!
ffmpeg -i INPUT -vcodec libx264 "OUTPUT.mp4"
recordmydesktop --no-sound -x 120 -y 200 --width 268 --height 63 --fps=25 -o baudline_1.ogv
rtl_sdr -f 108000000 -s 2400000 - | ./baudline -reset -samplerate 2400000 -channels 2 -format u8 -quadrature -stdin
installing rtl_sdr

sudo aptitude install libusb-1.0-0-dev cmake

git clone

cd rtl-sdr

mkdir build

cd build

cmake ..

sudo make install

pi@raspberrypi ~/rtl-sdr $ lsusb
Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
Bus 001 Device 004: ID 1a40:0101 Terminus Technology Inc. 4-Port HUB
Bus 001 Device 005: ID 0ccd:00d3 TerraTec Electronic GmbH
Bus 001 Device 008: ID 0cf3:9271 Atheros Communications, Inc. AR9271 802.11n
Bus 001 Device 007: ID 0d8c:000c C-Media Electronics, Inc. Audio Adapter

Create a new file as root named /etc/udev/rules.d/20.rtlsdr.rules that contains the following line:

sudo nano /etc/udev/rules.d/20.rtlsdr.rules

Add this line (check ID and Product to your specific card)
SUBSYSTEM=="usb", ATTRS{idVendor}=="0ccd", ATTRS{idProduct}=="00d3", GROUP="adm", MODE="0666", SYMLINK+="rtl_sdr"

Unplug dongle then:
sudo restart udev
plug dongle!

Is possible you have to blacklist the DVB TV module, if so the file where to list it is here:
sudo nano /etc/modprobe.d/raspi-blacklist.confh

Useful for RTL-SDR:
Radio has with it plentiful different kinds of magic. It traces communication (basic human need), it entertains our constant pattern recognition while tracing and building kinship.

Radio is at the core of many of today's technological developments is then fundamental that we make more with/of it. In this workshop we will consider aspects of pirate FM but span out onto TCP/IP packet based transmission or SHF decentralized infrastructures operating on the 2.4GHz (as in pirateboxes). Relay like IRC chats or wide range scanning of the electromagnetic spectrum in the search for breakthroughs (as in EVP - Electromagnetic Voice Phenomena).

To comprehend radio from the bottom and be able to trace with it not only other possible paths to the so much required social-technologies in the times of the opposite, technocratic social market driven and sponsored investments.
Block #1 (1:30min)
-Participants intro (30min allowing time to comment and introduce interests and experiences by everyone)
-Radio History First Amateur Radio Relay League infrastructure 1914 30min.
-EVP (Electromagnetic Voice Phenomena) 30min Listening to recordings

Short 15min break

Block#2 (1:30min)
-The electromagnetic spectrum map 30min
-Radio Scanning the local Using RTL-SDR under GNU/Linux Soundscape listening 30min
-Satellite Spotting (demo of aplications and freqs) 30min

Short 15min break

Block#3 (3:00)

Setting up a local FM radio and online stream using Free/Libre Software

Intro to Net.Radio and streaming audio.
What is an Iceast server for streaming distribution.

Hardware to use:
-RaspberryPi running raspbian or installing an OggStreamer and doing the radio programs via the software Airtime
-5Watts transmitter for the FM micro-radio station

Open space workshop for the study of radio-electric waves on a wide range spectrum (Micro-FM and/or Net.Radio. Satellite monitoring and/or Radio Controlled Flying Devices). We will install a micro-FM radio at Eastern Bloc using mostly free, mostly libre hardware and software (raspberryPi + rtl_sdr + homemade antenna's). To explore notions of radio art, sound art, noise, EVP but many more issues that could help us redefine what radio practices mean today on this 'digital' age.

Free Information Infrastructure.
It is indeed the task of giving life and content what makes a particular community service be alive. We will revisit radio and see how to re-invent it together, not just on the tech side but content wise. We call on any sort of sound related participation you could think of.


-Social Fiction and Science fiction
-Fictional Critisim
-Radio scanning for spectrum analysis using cheap USB dongles (rtl_sdr).
-ITC (Instrummental Transcommunication),EVP (Electromagnetic Voice Phenomena, ESP (Extra Sensory Perception)
WKSP by Martin Rodriguez, Sylvain Le Beux & Alejo Duque
Tech Rider:

- FM Transmitter 5W (URL Above)
- 2 Telescopic antennas 1m each
- 2 raspberryPi (optional Oggstreamer TBD - URL Above)
- 2 16gig SD cards class 10 Brand SandDisk
- A video projector at the place and sound system at the place where the workshop takes place
- 2 Radio receivers for the FM band, could be second hand as long as they are portable (Any FM radio from a second hand shop)


- RTL_SDR - Where to buy
- Portable handheld Scanner (not needed if we have the RTL-SDR)
- USB HUB and USB Soundcard and Microphone.
The other matter is the soldering time required, users says that it takes ~3-4 hours for the 25B compared to ~6-8 for the 30B ...

that's why the "chinese" with cooling fan and BNC ready is a better option, already built and yes is cheaper... i will prefer to buy 2 chinese in case one fails. For a longer time workshop this are the ideal ones to solder:

(also because the artist is the one that few decades back took upon radio and its performative layer as a social-technology.. micro-FM

I looked on google maps what a 1/4 mile (~400m) represents and it seems enough to be able to broadcast until the park nearby, as well as a couple of bars we usually hang out to.

same or even less than what we got with the chinese clone... obviuosly here the antenna placement is fundamental.. for FM LOS (line of sight) is important... well for any radio matter in general.

Also, another question : do you install airtime directly on the Pi ? it seems like it's feasible, and I am not afraid doing that :

wao, i was not concious of that.. wonder how stable it is.. and then, if it works.. i guess it will be not possible to run many other services.. a thing to try and i sort of prefer this exploration than the soldering of the transmitter.

It is possible to put content in airtime through the web ? (I mean like adding audio files from home while the server is at eastern bloc)

yes, like with any CMS one has an account and can log in via web interface to airtime to upload and program.