brmlab project:sdr

Eve's drops

Anonymous (anonymous@undisclosed.example.com) — 2015-05-28T01:07:33+00:00

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	+	====== Eve's drops ======

	+	//Eve's drops// is a multi-channel audio recorder. It provides convenient monitoring and statistics.
	+
	+	{{ :project:sdr:evesdrops.png?nolink \|}}
	+
	+	http://jenda.hrach.eu/gitweb/?p=fmrec;a=summary
	+
	+	http://jenda.hrach.eu/p/fmrec

FCL, a fast spectrum channelizer

Anonymous (anonymous@undisclosed.example.com) — 2016-11-25T07:29:49+00:00

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	====== FCL, a fast spectrum channelizer ======		====== FCL, a fast spectrum channelizer ======

-	FCL splits wideband spectrum from your SDR into narrowband channels. This is useful for networks that have lots of transmitters side-by-side, like for example [[http://jenda.hrach.eu/gitweb/?p=fmrec;a=summary\|FM broadcast]], [[:project:sdr:tetra\|TETRA]], [[:project:sdr:tetrapol\|Tetrapol]] and [[project:gsm:start\|GSM]].	+	FCL splits wideband spectrum from your SDR into narrowband channels. This is useful for networks that have lots of transmitters side-by-side, like for example [[http://jenda.hrach.eu/gitweb/?p=fmrec;a=summary\|FM broadcast]], [[:project:sdr:tetra\|TETRA]], [[project:tetrapol:start\|Tetrapol]] and [[project:gsm:start\|GSM]].

	It supports everything you would expect from a decent channelizer:		It supports everything you would expect from a decent channelizer:

Find, fix and finish

Anonymous (anonymous@undisclosed.example.com) — 2014-08-07T03:34:54+00:00

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	+	====== Find, fix and finish ======
	+
	+	fff is a convenient tool for in-field transmitter location & recovery by triangulation with directional antenna. The user interface is optimized for phones, tablets and other constrained handheld devices.
	+
	+	<code>
	+	/tmp/fifo
	+	----------------->
	+	I/Q samples
	+	RTL-SDR -----> fff_server fff_client
	+	(gnuradio) tcp:6666
	+	<---------------->
	+	XMLRPC control
	+
	+	</code>
	+
	+	===== Screenshot =====
	+
	+	<code>
	+	> ./fff_client.py
	+	Find, fix and finish by NSA Litoměřice
	+
	+	This program is part of GlobalEye signals intelligence toolkit.
	+	Visit http://jenda.hrach.eu/nsa/ for more information.
	+
	+	Hotkeys: g/h ... SDR gain
	+	n/m ... speed
	+	q ... quit
	+
	+	Starting DSP
	+
	+	▒
	+	▒
	+	▒
	+	▒
	+	█
	+	██
	+	████
	+	█████
	+	██████
	+	█████████
	+	███████████
	+	████████████▒
	+	████████████▒
	+	████████████▒
	+	████████████▒
	+	████████████▒
	+	████████████▒
	+	█████████▒
	+	█████████▒
	+	█████████
	+	████████████
	+	████████████████████████████████▒
	+	██████████████████████████████████▒
	+	██████████████████████████████████
	+	██████████████████████████████████▒
	+	██████████████████████████████████
	+	</code>
	+
	+	===== Usage =====
	+
	+	Adjust frequency and ppm in fff_server to your needs. Adjust FIR and decimation rate if you are targeting a wideband transmitter (default bandwidth is 10 kHz).
	+
	+	* mkfifo /tmp/fifo
	+	* ./fff_client.py
	+	* ./fff_server.py
	+
	+	===== Tips =====
	+
	+	Want to run fff_client over SSH from an untrusted machine?
	+
	+	<code>
	+	no-agent-forwarding,no-X11-forwarding,command="path_to_fff_client.py" ssh-nsa key
	+	</code>
	+
	+	===== Obtaining fff =====
	+
	+	git clone http://jenda.hrach.eu/p/fff/
	+
	+	http://jenda.hrach.eu/gitweb/?p=fff;a=summary
	+

GnuRadio and rtl-sdr on RaspberryPi

Anonymous (anonymous@undisclosed.example.com) — 2012-10-27T22:22:26+00:00

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	+	===== GnuRadio and rtl-sdr on RaspberryPi =====

	+	==== Building on RPi ====
	+
	+	* 3 GB of space in / for build-dependencies
	+	* swap (linking takes up to 1 GB RAM)
	+	* build-space (prefeably over network or on USB HDD to avoid destroying SD card)
	+	* compilation takes ~24 hours
	+
	+	NBD server example:<code>
	+	/etc/nbd-server/config:
	+	[generic]
	+	[export]
	+	exportname = /dev/mapper/group-pishare
	+	port = 2001
	+	authfile = /etc/nbd-server/pi
	+
	+	/etc/nbd-server/allow:
	+	192.168.0.203
	+
	+	mkfs.ext3 /dev/mapper/group-pishare
	+	mount /dev/mapper/group-pishare /mnt
	+	dd if=/dev/zero of=/mnt/swap bs=1M count=1500
	+	mkswap /mnt/swap
	+	umount /mnt
	+	</code>
	+
	+	On RPi:
	+	<code>
	+	apt-get install nbd-client
	+	modprobe nbd
	+	nbd-client 192.168.0.23 2001 /dev/nbd0
	+	mount /dev/nbd0 /mnt
	+	swapon /mnt/swap
	+	</code>
	+
	+	Use script [[http://www.sbrac.org/files/build-gnuradio\|build-gnuradio]]. When it fails, compile gnuradio [[https://lists.gnu.org/archive/html/discuss-gnuradio/2012-07/msg00266.html\|with soft FPU]]:
	+	<code>
	+	cd gnuradio/build
	+	cmake -Dhave_mfpu_neon=0 -DCMAKE_CXX_FLAGS:STRING="-march=armv6 -mfpu=vfp -mfloat-abi=hard" -DCMAKE_C_FLAGS:STRING="-march=armv6 -mfpu=vfp -mfloat-abi=hard" ../
	+	make
	+	sudo make install
	+	</code>
	+
	+	Croscompilation: TODO

Radio repeater

Anonymous (anonymous@undisclosed.example.com) — 2016-02-17T18:23:18+00:00

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	+	====== Radio repeater ======

	+	The goal is to obtain license from the Czech telecommunication office and run NBFM repeater in 2m band.
	+
	+	Legal parameters:
	+	* Allowed are NFM voice and AFSK data.
	+	* Allowed to operate are Spoje.net employees and brmlab members.
	+	* The transmitter is located in Střešovice.
	+	* The operation is allowed 25 kilometers around Malostranské náměstí. This covers entire Prague and Jílové, Říčany, Úvaly, Brandýs, Neratovice, Veltrusy, Kralupy, Velvary, Kladno, Loděnice, Řevnice and Davle. This does not cover Mníšek, Beroun, Slaný, Mělník and Čelákovice. We are sorry, but broader coverage would cost excessive money.
	+	* Allowed TX power is 10 W (40 dBmW) EIRP.
	+	* License permits 20 handheld stations and 10 stations in vehicles.
	+
	+	Status:
	+	* Obtain all the paperwork: WIP (by Harvie and Jim)
	+	* Acquire radio: Done (by TomSuch)
	+	* Program radio: Done
	+	* Acquire duplexer: Done
	+	* Tune duplexer: SPECZ, Jenda, drsnik
	+	* Acquire first stage RF filters: teroz.cz
	+	* Create antenna: Jenda, drsnik, SPECZ
	+	* Create software: Jenda
	+
	+	We hope we will be operational in spring 2016.
	+
	+	The software should implement advanced features like mailbox, predefined mails/HTTP requests etc. The whole thing should be UPSed allowing for 24 hours of operation without external power supply.

Silence detection and timestamping

Anonymous (anonymous@undisclosed.example.com) — 2012-08-09T13:30:51+00:00

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	+	====== Silence detection and timestamping ======

	+	Imagine there is something like civil band radio and you want to run some software overnight and have conversations logged like this:
	+	<code>
	+	-rw-r--r-- 1 jenda jenda 183k rec-2012-08-08-18-37-37.ogg
	+	-rw-r--r-- 1 jenda jenda 98k rec-2012-08-08-18-41-49.ogg
	+	-rw-r--r-- 1 jenda jenda 100k rec-2012-08-08-18-47-35.ogg
	+	-rw-r--r-- 1 jenda jenda 200k rec-2012-08-08-18-54-52.ogg
	+	</code>
	+	We will use one computer for receiving and another for splitting based on silence detection.
	+
	+	==== Receiving ====
	+
	+	gnuradio-companion sketch is [[http://jenda.hrach.eu/brm/rad/nbfm_rx.grc\|here]]. It receives narrow-band FM, but changing it for other modulations should be easy.
	+
	+	Create a pipe, run netcat to transmit data over the network and run the gnuradio program.
	+
	+	<code>
	+	mkfifo test.wav
	+	cat test.wav \| nc 192.168.77.226 3333 &
	+	./top_block.py
	+	</code>
	+
	+	==== Detecting ====
	+
	+	On the other end (well, you can run everything on one computer just by piping it instead of using netcat) download and compile [[http://jenda.hrach.eu/brm/rad/squelch-cut.c\|squelch-cut.c]] and run it like
	+
	+	<code>nc -l -p 3333 \| ./a.out</code>
	+
	+	WAV (they are actually RAW) files should appear in current working directory after the first transmission occurs.
	+
	+	Use oggenc to encode them to some more common format.
	+
	+	<code>oggenc -r -C 1 --raw-endianness 1 rec-*.wav</code>

Software Defined Radio

Anonymous (anonymous@undisclosed.example.com) — 2021-03-02T00:45:53+00:00

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	* See also: [[:event:dsp#Zdroje\|Digital Signal Processing#Zdroje]]		* See also: [[:event:dsp#Zdroje\|Digital Signal Processing#Zdroje]]

-	[code]	+	<code>
	< Jenda`> https://www.youtube.com/watch?v=wv79DSqVi9w		< Jenda`> https://www.youtube.com/watch?v=wv79DSqVi9w
	< Muaddibdib> [wv79DSqVi9w] #195: RF Diplexer Basics: Tutorial, construction and tuning (11:59)		< Muaddibdib> [wv79DSqVi9w] #195: RF Diplexer Basics: Tutorial, construction and tuning (11:59)
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	< Jenda`> https://www.youtube.com/watch?v=ImNRca5ecF0		< Jenda`> https://www.youtube.com/watch?v=ImNRca5ecF0
	< Muaddibdib> [ImNRca5ecF0] #275: Smith Chart: Z, VSWR, Reflection Coef and Transmission Line Effects (15:07)		< Muaddibdib> [ImNRca5ecF0] #275: Smith Chart: Z, VSWR, Reflection Coef and Transmission Line Effects (15:07)
-	[/code]	+	</code>

szdc

Anonymous (anonymous@undisclosed.example.com) — 2016-08-09T02:55:21+00:00

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	====== szdc ======		====== szdc ======

-	szdc is a receiver for a specific inverse tone coded squelch used by a certain railway network. It uses [[:project:sdr:fcl]] to get baseband channels and then some code with FFTW to detect presence of the IDLE tone. If IDLE tone is not present, the channel is assumed be active and is dumped to a file.	+	szdc is a receiver for a specific inverse tone coded squelch used by a certain railway network. It uses [[:project:sdr:fcl]] to get baseband channels and then some code with FFTW to detect presence of the IDLE tone. If IDLE tone is not present, the channel is assumed to be active and is dumped to a file.
		+
		+	If the channel is active for too long (see guard in constants.h), it is presumed that signal is lost or something and it is disabled (and appears in mask).

	Edit run.sh to suit your needs. Edit constants.h (number of channels, SNR).		Edit run.sh to suit your needs. Edit constants.h (number of channels, SNR).
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	$ make		$ make
	$ ./run.sh		$ ./run.sh
		+	Using Volk machine: avx_666
		+	snr: 54 31 51 58 60 61 59 32 58 57 61 mask:
		+	snr: 54 30 50 58 61 62 59 32 60 58 62 mask:
		+	Opening new file 2016-08-09-02-47-13.8.cfile
		+	snr: 42 29 52 57 60 62 50 37 4 50 52 mask:
		+	snr: 53 29 50 57 60 62 59 32 3 53 53 mask:
		+	snr: 46 27 52 58 61 62 57 50 55 51 58 mask:
		+	snr: 53 28 51 58 61 62 59 48 55 57 61 mask:
		+	snr: 53 32 50 57 59 61 59 36 56 56 59 mask:
		+	closing 8
		+	snr: 37 26 53 57 61 62 46 33 59 53 61 mask:
		+	...
	</code>		</code>

	To decode audio, you can use for example mfm.py from [[:user:jenda:kukuruku]].		To decode audio, you can use for example mfm.py from [[:user:jenda:kukuruku]].
	<code>		<code>
-	cat foo.cfile \| mfm.py -r 0.666	+	cat foo.cfile \| mfm.py -r 0.520833 # 25/48 kHz
	</code>		</code>

tetra-listener

Anonymous (anonymous@undisclosed.example.com) — 2017-01-02T11:35:36+00:00

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	tetra-listener consists of GnuRadio Tetra demodulator, [[http://tetra.osmocom.org/trac/\|Osmocom TETRA]] patches extracting speech data and some helper scripts.		tetra-listener consists of GnuRadio Tetra demodulator, [[http://tetra.osmocom.org/trac/\|Osmocom TETRA]] patches extracting speech data and some helper scripts.

-	https://brmlab.cz/gitweb/?p=tetra-listener.git;a=summary	+	https://jenda.hrach.eu/gitweb/?p=tetra-listener;a=summary

	[[https://www.youtube.com/watch?v=aMMEQNnSZIo&t=990\|A proprietary extension to TETRA standard]] enables psychological control of nearby people. The publicly available version of brmlab tetra-listener does not support this feature.		[[https://www.youtube.com/watch?v=aMMEQNnSZIo&t=990\|A proprietary extension to TETRA standard]] enables psychological control of nearby people. The publicly available version of brmlab tetra-listener does not support this feature.

Třitchoři - a radio reconnaissance tool

Anonymous (anonymous@undisclosed.example.com) — 2014-05-11T19:34:10+00:00

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	+	====== Třitchoři - a radio reconnaissance tool ======
	+
	+	<note warning>This tool is in a very initial phase of development (read: I've written most of the code tonight).</note>
	+
	+	//Třitchoři// is a radio reconnaissance tool for rtl-sdr-based software-defined radios. Given reasonably modern computer (Pentium 4+), it can scan the spectrum at over 1000 channels per second (compare with [[http://www.uniden.com/scanners/beartracker+153-warning-system-scanner-with-800-mhz-trunktracker-iii/invt/bct8g\|commercial ones]]). It provides both fast spectrum survey for tactical operations and long-term autonomous monitoring of radio situation. Moreover, several machines running //Třitchoři// can be linked into a scanning cluster for either faster scanning or more accurate results. Once the signal is found, it is recorded and metadata are saved into SQL database. Several decoders (analogue speech, narrowband data, digital Tetra/TRBO) are then run and type of the signal is recognized. Scanner operator can then flag the signal as "not interesting" (e.g. public radio broadcast) and it will be skipped in future runs or "interesting" and its recording will be prioritized.
	+
	+	The captured spectral data can be visualized in fancy whole-spectrum images. This is both cool and can be used as a poor man's spectrum analyzer.
	+
	+	===== Implementation status =====
	+
	+	* script for config and arguments handling, frequency generation and radio control ✓
	+	* database schema ✓
	+	* database interface FIXME
	+	* better peak detection FIXME
	+	* signal recognition FIXME
	+	* speech detection FIXME
	+	* scheduled recording FIXME
	+	* cluster interface FIXME
	+
	+	===== Usage =====
	+
	+	python scanner.py 90-100 420-430
	+
	+	===== Getting the source =====
	+
	+	There is a [[http://jenda.hrach.eu/p/tritchori.git\|git repo]] or you can [[http://jenda.hrach.eu/gitweb/?p=tritchori.git\|browse gitweb]].
	+
	+	solve prereq: pip install pyrtlsdr