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--- project:sdr [2012/11/18 13:34]
jenda [standalone, radio-observer.brm] radiolab@home!
+++ project:sdr [2013/06/14 05:35] (current)
mrkva
@@ Line 7: / Line 7: @@
 hw=-|
 founder=brmlab collective|
-interested=[[user:sargon]]\\ [[user:biiter]]\\ [[user:niekt0]]\\ [[user:pasky]]\\ [[user:nephirus]]\\ [[user:ruza]]\\ [[user:sysop]]\\ [[user:kiki]]\\ [[user:tlapka]]|
+interested=[[user:sargon]]\\ [[user:biiter]]\\ [[user:niekt0]]\\ [[user:pasky]]\\ [[user:nephirus]]\\ [[user:ruza]]\\ [[user:sysop]]\\ [[user:kiki]]\\ [[user:tlapka]] \\ [[user:mrkva]]|
 status=active
 }}
+<note important>Radiolab is being reconstructed. Some (or all) remote functionality might be unavailable</note>
+<note important>Calling to brmlab (e.g. in case of phone or internet disruption), brmlab calling channels:
+  * first shared frequency in 2m band (172.650 MHz, NFM, 5W EIRP)
+  * PMR CH7, no subtone (446.08125, NFM, 0.5W EIRP)
+  * CB CH 32, band C (27.325 MHz, NFM, 4W EIRP)
+  * OK0N Žižkov repeater (145.6 MHz DL, 145.0 MHz UL, 88.5 Hz CTCS)
+  * HAM shortwave FIXME (CW)
+  * It is not ensured someone will be listening, however CB station is powered on almost all the time.
+</note>
 Software Defined Radio is a computer peripheral that allows reception (and ideally also transmission) of arbitrary radio waves. Various peripherals have different frequency range, bandwidth and other capabilities. Best known are USRP (Universal Software Radio Peripherial) and RTL-SDR (extremely cheap DVB-T USB stick chipset).
@@ Line 17: / Line 28: @@
 ===== Status =====
-We have SDR station on the table near our library (RadioLab), and some antennas on the roof. A radio-adsb.brm computer is using RTL-SDR to generate a live map of airplane traffic (ADSB-based) over Prague. Other activities (TETRA etc.) are planned or work in progress.
+We have SDR station on the table near our library (RadioLab), and some antennas on the roof. A radio-adsb.brm computer has been using RTL-SDR to generate a live map of airplane traffic (ADSB-based) over Prague. Other activities (TETRA etc.) are planned or work in progress.
+===== What is available =====
+  * Several Linux computers with GnuRadio and rtl-sdr drivers installed and with SSH/VNC access.
+  * TB of storage space for your captured signals :)
+  * Helix and wire antennas on brmlab rooftop covering most of Prague.
+  * 400MHz YAGI pointing on <del>Ruzyně</del> Václav Havel Airport.
+  * CB transceiver.
+  * Several PMR446 walkie-talkies.
+  * Satellite card (TODO)
+  * HAM portable 2m/70cm transceiver upon request.
+  * Portable 400MHz YAGI upon request.
+  * advice related to Baofeng UV-5R device
+===== Projects =====
+Active:
+  * Hunting for radiosondes
+  * shortwave HAM (building TRX)
+Past and future:
+  * ADSB (planes)
+  * Hunting for radiosondes
+  * TETRA
+  * NOAA and other satellite images
+  * …more to come ;)
 ==== TODO ====
-  * setup [[http://www.websdr.org|WebSDR]]
+  <del>* setup [[http://www.websdr.org|WebSDR]]</del>
 ===== Hardware =====
@@ Line 34: / Line 71: @@
 === Elonics E4000 tuner ===
-    * 53 to 2211 MHz
+  E4K range: 53 to 2210 MHz
+  E4K L-band gap: 1106 to 1250 MHz
 {{:project:rtlsdr-elonics.jpg?400}}
@@ Line 47: / Line 86: @@
 ===== RadioLab =====
-==== standalone, radio-observer.brm ====
+==== standalone, radio-mgmt.brm ====
-i5, 4 GB, 40 GB, 12.04
+Pentium D, 1 GB, 40 GB, Ubuntu 12.04
 "public" computer, you can tune in GQRX (run ~/gqrx/gqrx), experiment with gnuradio…
@@ Line 55: / Line 94: @@
 **Remote listening** - tune radio in brmlab, listen at home!
-VNC: <code>xtightvncviewer -quality 7 -encodings tight 192.168.77.34:0</code>
+VNC: <code>xtightvncviewer -quality 7 -encodings tight 192.168.77.35:0</code>
 Maybe you will need to start a VNC server:
@@ Line 65: / Line 104: @@
 <code>radio@radio-observer:~$ x11vnc -display :0 -usepw -forever</code>
-  * Audio:
+  * Audio: Vorbis compressed (for listening)
-<code>ssh radio@192.168.77.34 "parecord | oggenc -r -C 2 -" | ogg123 -</code>
+<code>ssh radio@192.168.77.35 "parecord --channels=1 | oggenc -q "-1" -r -C 1 -" | ogg123 -</code>
+Uncompressed (e.g. for further processing)
+<code>ssh radio@192.168.77.35 "parecord --channels=1" | aplay -r 44100 -c 1 -f S16_LE</code>
 Average delay of this chain is 1-2 seconds.
-==== KVM 1, radio-services.brm ====
+**Tunnel raw data** - connect remote radio to your local receiver
+ <code>ssh -A -L1234:192.168.77.35:1234 username@nat.brmlab.cz 'ssh radio@192.168.77.35 "killall rtl_tcp; rtl_tcp -a 0.0.0.0"'</code>
+Then start gqrx locally with <code>device="rtl_tcp=127.0.0.1:1234"</code>
+Works for me with 300000Hz bandwith.
+==== radio-services.brm ====
 P4, 1 GB, 60 GB, 10.04
@@ Line 76: / Line 123: @@
 currently there is a web-server with [[http://radio-services.brm:8080/VirtualRadar/GoogleMap.htm|Virtual Radar]] map of planes running there
-==== KVM 2, radio-mgmt.brm ====
+==== radio-agenda.brm ====
-==== KVM 3, radio-agenda.brm, ====
 celeron, 512 MB, 80 GB, 10.04
-==== KVM 4, radio-adsbrx.brm ====
+==== radio-adsbrx.brm ====
 celeron, 512 MB, 40 GB, 10.10
@@ Line 90: / Line 135: @@
 ==== radio-wxsat.brm ====
+?
@@ Line 148: / Line 194: @@
   * [[http://metroweb.cz/diskuze/viewtopic.php?p=64750#p64750]] - frequencies used for FM communication in Prague subway
   * [[http://old.avc-cvut.cz/avc.php?id=3622]] - FEL ČVUT course on digital cellular network (czech)
+  * [[http://sdr.martinmarinov.info]]
   * [[http://people.xiph.org/~xiphmont/demo/neil-young.html|24/192 Music Downloads ...and why they make no sense]]
+  * [[http://www.ni.com/white-paper/13193/en/|Understanding RF Radio Broadcast]]
+  * [[https://wiki.xiph.org/Videos/Digital_Show_and_Tell|Digital Show and Tell]]
+  * [[http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter|http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter]]
+  *  [[https://www.rtl-sdr.com/signal-identification-guide/]] RADIO SIGNAL IDENTIFICATION GUIDE
   * See also: [[:event:dsp#Zdroje|Digital Signal Processing#Zdroje]]