SDR gnuradio RTL-SDR x N900 - Page 8 - maemo.org

Active Topics

Is there a section to talk about Java ME? Apps, etc. (6)
to General by Kalatti - 4 days, 2 hrs ago
Full linux distros on Sailfish OS (253)
to SailfishOS by qoh - 6 days, 20 hrs ago
more...

Page 8 of 10

« First

< Prev

Next >

Thread Tools

biketool	2014-06-06 , 10:18
Posts: 1,417 \| Thanked: 2,619 times \| Joined on Jan 2011 @ Touring	#71

Blam!
This worked and made a good recording from FM radio, well with the short antenna the RX is not great, I think the receiver is not very sensitive and FM radio is pretty far out on its RX capability. A bit better with the 70cm amateur band though seems like it is receiving the sound quiet compared to static volume.

Code:

sudo rtl_fm -f 464500000 -M fm -r 11000 - | lame -r -s 11000 -m m -b 64 - a.mp3

Did you compile Gqrx for the N900? For me having a radio head is easier on my brain than counting decimal places

Still not sure what I was doing wrong in aplay as live RX is more useful to me than a mp3 file.

for reference I am using one of these
http://www.ebay.com/itm/Mini-USB-DVB...item566184a239

Xes, you F$#@%$#ing rock!
SDR for my N900 is super sweet!

Last edited by biketool; 2014-06-06 at 10:23.

Quote & Reply |

The Following 2 Users Say Thank You to biketool For This Useful Post:
bla1, xes

biketool	2014-06-06 , 10:47
Posts: 1,417 \| Thanked: 2,619 times \| Joined on Jan 2011 @ Touring	#72

So I though I would try dropping gqrx into /usr/bin it fails when it doesn't find libgnuradio-audio-3.6.5.1.so.0.0.0

even though I have:

Code:

/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-analog-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-atsc-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-audio-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-blocks-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-comedi-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-core-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-digital-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-fcd-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-fft-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-filter-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-iqbalance.so
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-noaa-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-osmosdr-0.0.3git.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-pager-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-trellis-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-video-sdl-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-vocoder-3.6.5.1.so.0.0.0
/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib/libgnuradio-wavelet-3.6.5.1.so.0.0.0

Quote & Reply |

misiak	2014-06-06 , 11:21
Posts: 804 \| Thanked: 1,598 times \| Joined on Feb 2010 @ Gdynia, Poland	#73

Originally Posted by biketool

So I though I would try dropping gqrx into /usr/bin it fails when it doesn't find libgnuradio-audio-3.6.5.1.so.0.0.0

Did you add "/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib" to LD search path? Or tried LD_PRELOAD="all-stuffs-from-/home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib-one-by-one" /usr/bin/gqrx ?

edit: alternatively, if you feel brave, you may try linking all files from /home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib to /usr/lib for example (I wouldn't recommend copying them, as they are probably too big to fit there).

Quote & Reply |

The Following User Says Thank You to misiak For This Useful Post:
xes

biketool	2014-06-06 , 11:40
Posts: 1,417 \| Thanked: 2,619 times \| Joined on Jan 2011 @ Touring	#74

Originally Posted by misiak

(snip)
edit: alternatively, if you feel brave, you may try linking all files from /home/user/MyDocs/N900 SDR/N900 SDR/gnuradio/lib to /usr/lib for example (I wouldn't recommend copying them, as they are probably too big to fit there).

Wow... I just really looked at the path ofthose libs above and realized the files are not in any way installed with the rtl-sdr package but were in /home/user from my previous attempt to hand install the various files

Also USB mode works better than HEN for this application and is also right there to use, just use 'host mode with boost'.

ordering some of these
http://www.ebay.com/itm/DVB-T-RF-Coa...3D291162357864
so that I can chop the end off and have a few cut wire antennas which trave better than the mag mount which seems more appropriate for in a car.

Last edited by biketool; 2014-06-06 at 12:14.

Quote & Reply |

biketool	2014-06-10 , 05:59
Posts: 1,417 \| Thanked: 2,619 times \| Joined on Jan 2011 @ Touring	#75

I figured out the problem with aplay, just mover the files in home/user/.pulse to $.old

~~sadly I get no sound output when I run this though it appears everything s running correctly.~~

Code:

sudo rtl_fm -f 430175000 -M -r 11000 - | aplay -r 11k -f S16_LE -t raw -c 1

BTW why does rtl_fm need to be run as root to avoid segfault?

(edit)

Code:

sudo rtl_fm -f 430175000 -M fm -r 11000 - | aplay -r 11k -f S16_LE -t raw -c 1

The missing option fm (or wbfm, am, usb, lsb, raw) after -M fixes the modulation setting, AM and sideband work too!! SDR, Eff Yea!! I need to get/make an upconverter for HF bands. On FM broadcast radio in rural areas the -g (gain) set to 20 really helped me a gain of 50 barely brings in some air band signals .

Last edited by biketool; 2014-06-10 at 07:22.

Quote & Reply |

biketool	2014-06-16 , 11:15
Posts: 1,417 \| Thanked: 2,619 times \| Joined on Jan 2011 @ Touring	#76

btw, it is much easier for my brain to fix the decimal in rtl_fm to call the 430175000 entry 430.175M the M meaning mega or Mhz which chops six decimal places off, we don't commonly talk in hertz we talk megahertz/Mhz in the range that the RTL-SDR works in.

I ordered a larger SDR dongle for about $6 delivered to see if my sensitivity issues were just related to my tiny dongle which I bought to accompany my N900.

It seems that MCX male has become the standard antenna connector port on many of the DVB-T dongles we are using for SDR with the rest using a RF coaxial connector.

Last edited by biketool; 2014-06-16 at 11:18.

Quote & Reply |

biketool	2014-06-16 , 11:32
Posts: 1,417 \| Thanked: 2,619 times \| Joined on Jan 2011 @ Touring	#77

This is sort of off topic but I am curious, is anyone else having trouble installing the files Xes has made available? I can only install them by finding the .deb, downloading it, and installing it with dpkg. I wonder how many other cool apps are not showing up for some reason. I am able to view other files available on extras, extras-dev, and extras-testing.

Quote & Reply |

	joerg_rw	2014-06-16 , 12:01
	Posts: 2,222 \| Thanked: 12,651 times \| Joined on Mar 2010 @ SOL 3	#78

Originally Posted by biketool

This is sort of off topic but I am curious, is anyone else having trouble installing the files Xes has made available? I can only install them by finding the .deb, downloading it, and installing it with dpkg. I wonder how many other cool apps are not showing up for some reason. I am able to view other files available on extras, extras-dev, and extras-testing.

Maybe "hidden" in HAM? not in "user" group (or somesuch)?

__________________
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member

EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/

IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N