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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 2013-09-09 11:00
Re: SDR gnuradio RTL-SDR x N900
 
Quote:
Originally Posted by joerg_rw (Post 1373041)
AIUI the specs say you get a usb dongle wtih 500kHz..50MHz. I don't see how you can use the original range of the DVB-T dongle which is ~50MHz..2000MHz when the converter got installed. You at least would need a means to switch off and bypass the converter, and unless you do that with a slide switch on the dongle, there's probably no way to do it via USB.
Did I miss something? Did they find a cute way to control the converter e.g. via the IR, LED or other GPIO on rtl2832? Or would I actually need two of those for the full range?

/j
Even so it still is so cheap and small even carrying two.

I suppose you could repackage two dongles together and run software to activate one or the other. If you felt especially tricky you could put a duplexer onto the antenna feed and run the HF to the modded dongle and VHF+ to the unmodded one.

joerg_rw 2013-09-09 11:09
Re: SDR gnuradio RTL-SDR x N900
 
Quote:
Originally Posted by psychologe (Post 1373076)
i mean is possible use n900 instead of PC host ,connect "compatible phone" (@@MotorolaC115@@) to N900 via H-E-N hostmode,MotorolaC115. MotorolaC115 run osmocomBB baseband firmware ,and N900 run Firmware management and GSM Layer 2/3 application
sorry ,my bad english ..
http://bb.osmocom.org/trac/wiki/Applications
The longer I know my N900 the less I think there's *anything* it can't do ;-)
I wouldn't see a reason why you can't use it the way you suggested.
/j

joerg_rw 2013-09-09 11:12
Re: SDR gnuradio RTL-SDR x N900
 
Quote:
Originally Posted by biketool (Post 1373093)
Even so it still is so cheap and small even carrying two.

I suppose you could repackage two dongles together and run software to activate one or the other. If you felt especially tricky you could put a duplexer onto the antenna feed and run the HF to the modded dongle and VHF+ to the unmodded one.
HEY, doesn't E4000 (or the 802?) tuner come with two antenna inputs to switch between? :-D
/j

vi_ 2013-09-09 11:23
Re: SDR gnuradio RTL-SDR x N900
 
This is the coolest thing I have seen this month.

You can get 500 bonus internet points if you can decode POCSAG pager messages in real time.

xes 2013-09-09 14:08
Re: SDR gnuradio RTL-SDR x N900
 
Quote:
Originally Posted by psychologe (Post 1373076)
thank you reply.
osmocomBB devided into two separate applications:
1,running on the baseband chip of the phone
2,running on a PC, communicating with the baseband firmware over serial

i mean is possible use n900 instead of PC host ,connect "compatible phone" (@@MotorolaC115@@) to N900 via H-E-N hostmode,MotorolaC115. MotorolaC115 run osmocomBB baseband firmware ,and N900 run Firmware management and GSM Layer 2/3 application
sorry ,my bad english ..
http://bb.osmocom.org/trac/wiki/Applications
Sorry, i have no experience with osmocomBB, but i tried to build osmocomBB and also osmocomGMR without success.. :(

joerg_rw 2013-09-09 14:23
Re: SDR gnuradio RTL-SDR x N900
 
for osmocomBB questions you might want to /join #osmocom
for talking to author of rtl_fm et al: /join ##rtlsdr
/j

xes 2013-09-10 09:27
Re: SDR gnuradio RTL-SDR x N900
 
Quote:
Originally Posted by vi_ (Post 1373103)
This is the coolest thing I have seen this month.

You can get 500 bonus internet points if you can decode POCSAG pager messages in real time.
Probably you should check again the first post searching for some "bonus"... ;)

....multimon-ng!

biketool 2013-09-11 06:17
Re: SDR gnuradio RTL-SDR x N900
 
OK, I am a SDR freak so I want to give this a try but since I only currently have my everyday N900 I want to be careful.
Can you post the exact directories each of these files should link to?
Obviously they will go into the directories contained in the tars but I just want to be sure I am grabbing everything needed.
I dont want to go through a bootloop crisis like I did installing the pre-.deb 720p video drivers.

biketool 2013-09-11 06:20
Re: SDR gnuradio RTL-SDR x N900
 
Quote:
Originally Posted by vi_ (Post 1373103)
This is the coolest thing I have seen this month.

You can get 500 bonus internet points if you can decode POCSAG pager messages in real time.
Dosbox will run a nice POCSAG decoder, I will look around for the files, there are on some hard disk around here.

(edit) here we go everything to build the infrastructure and hack old pagers for a paging network on amateur radio(or whatever) freqs for probably under $100, also has the DOS decoder towards the bottom.
http://www.qsl.net/kb9mwr/projects/pager/plan.html
(edit2) or just use the now included multimon!

biketool 2013-09-11 07:11
Re: SDR gnuradio RTL-SDR x N900
 
BTW the dongle I have has a PAL antenna connector for those wanting to geek on some satellite passes. Is there libgnuradio-NOAA for grabbing weather sats in your build? answer = $/gnuradio/lib/libgnuradio-noaa-3.6.5.1.so


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