Re: [Discuss-gnuradio] psk modulation

[EsserIHF]

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
> 
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