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RTL2832U SDR Ditigal Receiver

Posted: Mon Mar 18, 2013 4:40 am
by rowan.doherty
A little off the 'official topic', but I'm a SDR newbie and wanted to get some practice and information before my bladeRF arrives, so I purchased a $10 RTL2832U receiver.
Basically what I want to be able to do with it (other than see what signals are already out in the ether) is use one of my 433MHz transmitters to send some data transmissions with different modulation schemes (ASK, FSK, PSK, etc) and decode the data.

Does anyone have any websites that demonstrate an RTL2832 USB module doing something like this? Are there many Linux-based guides?
I'm hoping someone can point me in the right direction. I've already hooked up and had a lot of fun with it. :)

Re: RTL2832U SDR Ditigal Receiver

Posted: Mon Mar 18, 2013 9:45 am
by madengr
Have you tried GNU Radio? I'd start with that and listening to narrow band FM, trying to duplicate what you have already done with SDR#, but now you'll figure out what's going on under the hood; frequency translation, filtering, decimation, etc.

Probably ought to get that installed (compiled from source) and play around with demod blocks in GRC (GNU Radio Companion). It's pretty easy to demod waveforms, but actually digital decoding and doing something with the data is more complex. There is lots of 800 MHz trukned audio to listen to in metro areas, most of which may be coded in P25, but there is a decoder for that too.

Re: RTL2832U SDR Ditigal Receiver

Posted: Thu Mar 21, 2013 2:47 am
by rowan.doherty
GNU Radio looks to be exactly what I need. Hopefully I get some time on the weekend to look into it.
Cheers for the info madengr! :)

Re: RTL2832U SDR Ditigal Receiver

Posted: Wed Jun 19, 2013 7:32 am
by deepaknx

You can also check rtl433 (which includes rtl-fm also) which can be used to capture the 433Mhz transmissions.