Re: [Discuss-gnuradio] fm modulation

[EsserIHF]

Thank you very much. Now it is running perfectly :) You helped me a lot to
understand it. Thank you.



Alexandru Csete-3 wrote:
> 
> If you fix your sampling rates to be consistent in all blocks (e.g.
> 64k on audio side, 320k on the other side) and decrease the signal
> frequency to be strictly less than half the audio rate, say 31 kHz
> you'll see the peaks.
> 
> Note that the NBFM block is for narrow band FM, which usually means
> less than 5kHz. If you want to send higher frequency signal you may
> want to switch to the WBFM block.
> 
> Alex
> 
> 
> On 13 July 2010 15:33, EsserIHF <address@hidden> wrote:
>>
>> Thank you,
>> I tried to use the NBFM transmit block.
>> I generated a signal with a frequency of 32k. This I connected with the
>> NBFM-Block. The quadrature Rate of this block is 320k. This output i
>> connected with the USRP an a FFT-Plot. I expected to see a line
>> at 320k and two lines at (320k- 32k) = 288k and (320k+32k) = 352k. But on
>> the FFT-Plot and on the Spectrum Analzer which is connected to the USRP,
>> I
>> only see a line at 320k.
>> Here the grc-file:
>>  http://old.nabble.com/file/p29150442/myFM.grc myFM.grc
>> --
>> View this message in context:
>> http://old.nabble.com/fm-modulation-tp29149390p29150442.html
>> Sent from the GnuRadio mailing list archive at Nabble.com.
> 
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
> 

-- 
View this message in context: 
http://old.nabble.com/fm-modulation-tp29149390p29158586.html
Sent from the GnuRadio mailing list archive at Nabble.com.