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Re: [Discuss-gnuradio] psk modulation


From: EsserIHF
Subject: Re: [Discuss-gnuradio] psk modulation
Date: Thu, 15 Jul 2010 01:48:55 -0700 (PDT)

I think my problem has something to do with the parameters of the USRP. I now
try to send a file modulated with DBPSK. So I build a graph 
File source -> Packet Encoder -> DPBSK MOD -> DPBSK DEMOD -> Packet Decoder
-> File sink
and i really get the correct output file. Here the grc:
http://old.nabble.com/file/p29170637/top_block.py top_block.py 
If I put a USRP source and USRP sink into graph, I don't receive anything.
Not even one byte. Here the grc:
http://old.nabble.com/file/p29170637/top_block.py top_block.py 
I hope anyone can help me. Thanks



EsserIHF wrote:
> 
> Yesterday I looked in this example. I let this example run with the
> parameters "-m dbpsk -f 20000",so the example should do the modulation.
> But on my scope, I still can't see a good modulated signal. Here is the
> output:
>  http://old.nabble.com/file/p29169627/dbpsk.png dbpsk.png 
> Can someone explain to me why I didn't get the right output? Thank you
> 
> 
> Tom Rondeau wrote:
>> 
>> On Wed, Jul 14, 2010 at 7:20 AM, EsserIHF <address@hidden>
>> wrote:
>>>
>>> Hi everyone,
>>> I am trying to do a PSK-Modulation. For that i use the dpsk-block and
>>> choose
>>> dbpsk which should be the same as psk-modulation. I connect the USRP
>>> with a
>>> oscilloscope, but i didn't get the expected output.
>>> I tried to set the input vector to 127,127...127 and 0,1,0,1.....0,1 but
>>> i
>>> either didn't get a good output.
>>> Where is my mistake? Please help, thank you.
>>>
>>> http://old.nabble.com/file/p29160823/psk.grc psk.grc
>>>
>>> the output for the vector 0,1....0,1 is this:
>>>
>>> http://old.nabble.com/file/p29160823/tek0062.jpg tek0062.jpg
>> 
>> 
>> Have you tried running benchmark_tx.py in
>> gnuradio-examples/python/digital?
>> 
>> You can use that as a reference for how to use the modulator.
>> 
>> Tom
>> 
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> address@hidden
>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>> 
>> 
> 
> 

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