pieter.heremans@gmail.com       
ptr_here@riseup.net                    

prep for next week (26th of nov)

Installing GNU Radio:
* Using the package manager in your favorite Linux distribution.
*Pybombs: http://gnuradio.org/redmine/projects/pybombs/wiki
*download pentoo or another live distro (http://gnuradio.org/redmine/projects/gnuradio/wiki/GNURadioLiveDVD ?)


let's go for PENTOO 
  (alike mossmann https://github.com/mossmann/hackrf/wiki/Getting-Started-with-HackRF-and-GNU-Radio)
--> download (4GB...) eg.
     # wget -c http://mirror.switch.ch/ftp/mirror/pentoo/Pentoo_amd64_default/pentoo-amd64-default-2015.0_RC4.4.iso 
     the torrent file listed is dead-end... tracker encoded in the torrent is not happy...

--> dd this to a usb-stick (or use unetbootin or alike if you want a gui)

--> quickly tested pentoo 2015.0 - grc is version 3.7.8 - osmocom/rtlsdr works out of the box so we're good to go

keyfobs / weatherstation / ... take it all :-)

== pocsag ==
https://en.wikipedia.org/wiki/POCSAG

Blacklist the default DVB module for the RTL SDR:

cat <<EOF > /etc/modprobe.d/rtl-sdr-blacklist.conf
blacklist dvb_usb_rtl28xxu
blacklist e4000
blacklist rtl2832
EOF

If that doesn't work, unload the conflicting module manually:
modprobe -r dvb_usb_rtl28xxu


a first try for pocsag-decoding with grc
cat <<EOF | base64 -d | gunzip > pocsag.grc
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EOF


handy commandline for converting binary file to ascii 1/.0 ...
hexdump -v -e '1/1 "%01x"' pocsags


let's compare this to s.munaut's implementation and learn a thing or two :-) 

https://github.com/smunaut/osmo-pocsag

== moar ==

codec2 modem  (doesn't work on pentoo as codec2 objects are missing there...)

cat <<EOF | base64 -d | gunzip > codec2.grc

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EOF



----

some notes
session 1

waves & oscillations 
- cfr projected circular motion   http://www.youtube.com/watch?v=KgLYi2acPDI&t=24m15s
- the sine wave : https://www.youtube.com/watch?v=P-Umre5Np_0


iq-signals
- a particular 'notation' used in SDR  
- good movie explaining usefullness of iq, starts from the viewpoint of signal generation : https://www.youtube.com/watch?v=h_7d-m1ehoY


mixing waves : 
- the 'beating' phenomenon https://www.youtube.com/watch?v=aCocQa2Bcuc&t=1m25s
-   

sampling:
excellent old school demo: (MIT, Oppenheim, Sampling demonstration 1&2)    https://www.youtube.com/watch?v=zBJMh-m9b1E
https://www.youtube.com/watch?v=OQNR099y8mM
(longer presentation : 'Lecture 16' https://www.youtube.com/watch?v=P3eLer1edx8)

m'ossmann sdr lectures 
(all worth a look https://greatscottgadgets.com/sdr/)
had a quick look at 9th 'lesson : https://www.youtube.com/watch?v=PxwE-bIoIAU on aliasing

impedance : 
fantastic old (1959) demonstration of importance of impedance characteristics of wave medium:  https://www.youtube.com/watch?v=DovunOxlY1k&t=1m43s


// bit of context on maxwell and his equations (nice tech/historic overview, goes into quantum stuff at the end though) https://www.youtube.com/watch?v=SG343kojbnU
//  equations got formulated 150 years ago https://news.ycombinator.com/item?id=10613063

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EOF



Clock Recovery MM 

explained here : https://www.tablix.org/~avian/blog/archives/2015/03/notes_on_m_m_clock_recovery/