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maemo.org - Talk (https://talk.maemo.org/index.php)
-   Nokia N900 (https://talk.maemo.org/forumdisplay.php?f=44)
-   -   SDR gnuradio RTL-SDR x N900 (https://talk.maemo.org/showthread.php?t=91182)

biketool 2013-12-22 11:16
Re: SDR gnuradio RTL-SDR x N900
 
BTW I verified setup with XES who says...

"Well, it's very easy... Unpack all in /opt/ , add the gnuradio and rtl_sdr libs folder in /etc/ld.so.conf or symlink them into /usr/lib. ...Done and ready to go! "

xes 2013-12-27 11:33
Re: SDR gnuradio RTL-SDR x N900
 
Power consumption comparison of different rtl2832 DVB-T keys:

http://funcubedongle.pbworks.com/w/page/65555471/Power

http://blog.palosaari.fi/2013/06/nak...-rtl2832u.html

...it seems that the E4000 is the best choice when used with the N900

gianko 2014-02-03 02:39
Re: SDR gnuradio RTL-SDR x N900
 
is it possible to monitor bus waiting times as explained here? http://www.windytan.com/2013/11/deco...-bus-stop.html

xes 2014-02-03 21:33
Re: SDR gnuradio RTL-SDR x N900
 
Quote:
Originally Posted by gianko (Post 1410562)
is it possible to monitor bus waiting times as explained here? http://www.windytan.com/2013/11/deco...-bus-stop.html
Sure!! Outside there are many things you can decode with a rtl2832 key!
For example, weather stations, door remotes, wireless alarms...

Look here:
https://github.com/merbanan/rtl_433

xes 2014-02-09 21:26
Re: SDR gnuradio RTL-SDR x N900
 
News:
libusb1 is available in extras repo and also rtl-sdr built from latest git version 0.5.3.2 should be available soon:
http://maemo.org/packages/package_in...-5b01-1maemo6/

Estel 2014-02-10 22:51
Re: SDR gnuradio RTL-SDR x N900
 
Hell yeah! Thank you very much.

Now, you may consider adding "[Annoucement]" to thread title.Either way, I hope it gains attention that it deserves.

biketool 2014-06-05 17:02
Re: SDR gnuradio RTL-SDR x N900
 
Xes, I finally fought with apt and have it all installed, now I am getting aplay errors of all things. Since I have the deb installed and it is in /usr/bin I edited the line from the optified example on your first post.
Code:
rtl_fm -f 430175000 -N -r 11000 - | aplay -r 11k -f S
16_LE -t raw -c 1
Failed to stat runtime directory /home/user/.pulse/8ec05df9ed93e7200d2004d40053170b:runtime: Invalid argument
rtl_fm: invalid option -- N
rtl_fm, a simple narrow band FM demodulator for RTL2832 based DVB-T receivers

Use:        rtl_fm -f freq [-options] [filename]
        -f frequency_to_tune_to [Hz]
            use multiple -f for scanning (requires squelch)
            ranges supported, -f 118M:137M:25k
        [-M modulation (default: fm)]
            fm, wbfm, raw, am, usb, lsb
            wbfm == -M fm -s 170k -o 4 -A fast -r 32k -l 0 -E deemp
            raw mode outputs 2x16 bit IQ pairs
        [-s sample_rate (default: 24k)]
        [-d device_index (default: 0)]
        [-g tuner_gain (default: automatic)]
        [-l squelch_level (default: 0/off)]
        [-p ppm_error (default: 0)]
        [-E enable_option (default: none)]
            use multiple -E to enable multiple options
            edge:  enable lower edge tuning
            dc:    enable dc blocking filter
            deemp:  enable de-emphasis filter
            direct: enable direct sampling
            offset: enable offset tuning
        filename ('-' means stdout)
            omitting the filename also uses stdout

Experimental options:
        [-r resample_rate (default: none / same as -s)]
        [-t squelch_delay (default: 10)]
            +values will mute/scan, -values will exit
        [-F fir_size (default: off)]
            enables low-leakage downsample filter
            size can be 0 or 9.  0 has bad roll off
        [-A std/fast/lut choose atan math (default: std)]

Produces signed 16 bit ints, use Sox or aplay to hear them.
        rtl_fm ... | play -t raw -r 24k -es -b 16 -c 1 -V1 -
                  | aplay -r 24k -f S16_LE -t raw -c 1
          -M wbfm  | play -r 32k ...
          -s 22050 | multimon -t raw /dev/stdin

aplay: playback:2297: read error
Any chance you will be packaging gqrx?
I wish I had a handle on the technical side of Linux like I do with analog components; I wouldn't ever bother you again. I think I need to go make a yaggi and once I figure this out see if I can pull down some weather satellite feeds.

biketool 2014-06-06 06:01
Re: SDR gnuradio RTL-SDR x N900
 
Tried again like this
Code:
rtl_fm -f 430175000 -N -r 11000 - | lame -r -s 11000 -m m -b 64 - a.mp3
Looks like everything was fine on the lame side but I got a segmentation fault.
in lsmod I have rtc_core rtc_twl4030 loaded
I am not sure how to get rtl_fm to give a more verbose fail.

Off topic but I was surfing around in the repos and saw you have uploaded hamlib, what other things for hams do you have on the repos, for seme reason I had to hand load things like libusb1, not searchable via my app manager.

xes 2014-06-06 08:50
Re: SDR gnuradio RTL-SDR x N900
 
@biketool
please check again using new syntax "-M fm" instead "-N".
rtl-sdr version available in extras-testing uses new syntax (as you can see from your error message)

First post updated.

biketool 2014-06-06 09:32
Re: SDR gnuradio RTL-SDR x N900
 
Tried your above, even
Code:
rtl_fm -f 430175000
causes a segmentation fault...


Oh S#!t ran as root and......
well not quite but closer; rtl_fm is going though
Code:
~/MyDocs $ sudo rtl_fm -f 430175000 -M -r 11000 - | apla
y -r 11k -f S16_LE -t raw -c 1
Failed to stat runtime directory /home/user/.pulse/8ec05df9ed93e7200d2004d40053170b:runtime: Invalid argument
Found 1 device(s):
0: Realtek, RTL2841UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Tuner gain set to automatic.
Tuned to 430427000 Hz.
Oversampling input by: 42x.
Oversampling output by: 1x.
Buffer size: 8.13ms
Exact sample rate is: 1008000.009613 Hz
Sampling at 1008000 S/s.
Output at 24000 Hz.
Good news its that a double scud battery seems to support enough amps for this USB dongle.


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