Re: [Discuss-gnuradio] Simple Broadcast FM Receiver

[Martin Dvh]

Muhammad Abrar wrote:
> Now I run this program n my Laptop on whicg gnuradi 3.0.4-2ubuntu2  is
> installed and i get following message.
> 
> muhammadab...@ubuntu:~/Documents/usrp$ python usrp_wfm_rcv_pll.py
 gr_fir_ccf: using SSE
 gr_fir_fff: using SSE
 gr_fir_fcc: using SSE
> audio_alsa_sink[hw:0,0]: unable to support sampling rate 32000
>   card requested 44100 instead.
> FYI: This implementation of the stereo_carrier_pll_recovery has no
> squelch implementation yet
> FYI: No Powermate or Contour Knob found
> FYI: This implementation of the stereo_carrier_pll_recovery has no
> squelch implementation yet
> auauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauauaumuhammadab...@ubuntu:~/Documents/usrp$
> 
> 


> audio_alsa_sink[hw:0,0]: unable to support sampling rate 32000
>   card requested 44100 instead.
This means the your audio_card does not support 32000 Hz samplerate.
So you get Audio Underruns  (aU)
This can be solved by using the commandline parameter
-O plughw:0,0

This will use the alsa software resampler to resample the 32000  to 44100

Please use reply-to-all when using the mailinglist.
Now I was the only one who got your reply, and not the mailinglist.

Greetings,
Martin
> 
> 2009/1/27 Martin DvH  >
> 
> 
> On Mon, 2009-01-26 at 17:04 +1300, Muhammad Abrar wrote:
> > when i run this program ithe following ewrror appears, how can i
> resolve this.
> > Nameerror: microtune_eval_board is not defined at line 70:
> >
> > #!/usr/bin/env python
> >
> > # simple broadcast FM receiver
> >
> >
> > from GnuRadio import *
> >
> > #
> > # return a gr_FlowGraph
> > #
> > def build_graph (IF_freq):
> > input_rate = 20e6
> >
> > CFIR_decimate = 125
> > RFIR_decimate = 5
> > fm_demod_gain = 2200
> >
> > quad_rate = input_rate / CFIR_decimate
> >
> > audio_rate = quad_rate / RFIR_decimate
> >
> > volume = 1.0
> >
> > src = GrHighSpeedADCSourceS (input_rate)
> >
> > # compute FIR filter taps for channel selection
> > channel_coeffs = \
> >   gr_firdes.low_pass (
> >
> > 1.0,  # gain
> > input_rate,   # sampling rate
> > 250e3,# low pass cutoff freq
> > 8*100e3,  # width of trans. band
> > gr_firdes.WIN_HAMMING)
> >
> > # input: short; output: complex
> >
> > chan_filter = \
> >   GrFreqXlatingFIRfilterSCF (CFIR_decimate,
> >  channel_coeffs,
> >  IF_freq)
> > # input: complex; output: float
> > fm_demod = \
> >
> >   GrQuadratureDemodCF (volume * fm_demod_gain)
> >
> > # compute FIR filter taps for audio filter
> > width_of_transition_band = audio_rate / 32
> > audio_coeffs = \
> >   gr_firdes.low_pass (
> > 1.0,# gain
> >
> > quad_rate,  # sampling rate
> > audio_rate/2 - width_of_transition_band,
> > width_of_transition_band,
> > gr_firdes.WIN_HAMMING)
> >
> > # input: float; output: short
> > audio_filter = \
> >
> >   GrFIRfilterFSF (RFIR_decimate, audio_coeffs)
> >
> > final_sink = GrAudioSinkS ()
> >
> > fg = gr_FlowGraph ()
> >
> > fg.connect (src, chan_filter)
> > fg.connect (chan_filter, fm_demod)
> > fg.connect (fm_demod, audio_filter)
> >
> > fg.connect (audio_filter, final_sink)
> >
> > return fg
> >
> > if __name__ == '__main__':
> >
> > # connect to RF front end
> > rf_front_end = microtune_eval_board ()
> > if not rf_front_end.board_present_p ():
> >
> > raise IOError, 'RF front end not found'
> >
> > # set gain and radio station frequency
> > rf_front_end.set_AGC (300)
> > rf_front_end.set_RF_freq (100.1e6)
> >
> > IF_freq = rf_front_end.get_output_freq ()
> >
> > fg = build_graph (IF_freq)
> > fg.start ()# fork thread(s) and return
> > raw_input ('Press Enter to quit: ')
> > fg.stop ()
> >
> >
> You are using a very very old version of gnuradio.
> Please update to the current tarball or svn code:
> http://gnuradio.org/trac/wiki/Download
> http://gnuradio.org/trac/wiki/GettingStarted
> 
> Greetings,
> Martin
> > --
> > Engr. Muhammad Abrar
> > NewZealand
> > Mob: 0064211204202
> > Res: 006463586340
> > ___
> > Discuss-gnuradio mailing list
> > Discuss-gnuradio@gnu.org 

Re: [Discuss-gnuradio] Simple Broadcast FM Receiver

[Eric Blossom]

On Mon, Jan 26, 2009 at 10:45:46PM -0800, Firas Abbas wrote:
> Hi,
>
> >  On Tue, 1/27/09, Eric Blossom  wrote:
> >
> >
> > Attention all newbies: 
> > 
> > Please read the GNU Radio FAQ and the USRP FAQ and try
> > searching with google before posting to the list.
> > 
> >   http://gnuradio.org/trac/wiki/FAQ
> >   http://gnuradio.org/trac/wiki/UsrpFAQ
> > 
> > Most commands support a --help option.  Try using it. 
> > Also read the README files contained in the source code.
> > 
> > After doing all of the above, if you've still got a
> > question, you're more likely to get a helpful response on this mailing list
> > if you provide us information that could allow us to help you. 
> >
> > Welcome!
> > Eric
> 

> May be we need to write a special wiki page with a link from the
> main gnuradio wiki for the newbies like (' New to GnuRadio Click
> Here', or 'For Newbies -- Start From Here').
> 
> 
> Best Regards,
> Firas

That sounds like a good idea!

Eric


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Re: [Discuss-gnuradio] Simple Broadcast FM Receiver

[Firas Abbas]

Hi,



>  On Tue, 1/27/09, Eric Blossom  wrote:
>
>
> Attention all newbies: 
> 
> Please read the GNU Radio FAQ and the USRP FAQ and try
> searching with google before posting to the list.
> 
>   http://gnuradio.org/trac/wiki/FAQ
>   http://gnuradio.org/trac/wiki/UsrpFAQ
> 
> Most commands support a --help option.  Try using it. 
> Also read the README files contained in the source code.
> 
> After doing all of the above, if you've still got a
> question, you're more likely to get a helpful response on this mailing list
> if you provide us information that could allow us to help you. 
>
> Welcome!
> Eric


May be we need to write a special wiki page with a link from the main gnuradio 
wiki for the newbies like (' New to GnuRadio Click Here',   or 'For Newbies -- 
Start From Here').


Best Regards,

Firas


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Re: [Discuss-gnuradio] Simple Broadcast FM Receiver

[Eric Blossom]

On Tue, Jan 27, 2009 at 10:32:38AM +1300, Muhammad Abrar wrote:
> when i run this program i got this message.
> stud...@it028743:~/Documents/usrp$ python usrp_wfm_rcv_pll.py
> >>> gr_fir_ccf: using SSE
> >>> gr_fir_fff: using SSE
> >>> gr_fir_fcc: using SSE
> FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
> implementation yet
> FYI: No Powermate or Contour Knob found
> FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
> implementation yet
> aUaUaUaUFYI: This implementation of the stereo_carrier_pll_recovery has no
> squelch implementation yet
> FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
> implementation yet
> FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
> implementation yet
> FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
> implementation yet
> FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
> implementation yet
> FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
> implementation yet
> FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
> implementation yet
> auauauauauauauauauauauauaustud...@it028743:~/Documents/usrp$
> 
> 
> what its mean and how i can receive FM transmission.
> 

Attention all newbies: 

Please read the GNU Radio FAQ and the USRP FAQ and try searching with
google before posting to the list.

  http://gnuradio.org/trac/wiki/FAQ
  http://gnuradio.org/trac/wiki/UsrpFAQ

Most commands support a --help option.  Try using it.

Also read the README files contained in the source code.

After doing all of the above, if you've still got a question, you're
more likely to get a helpful response on this mailing list if you
provide us information that could allow us to help you.  E.g., what
version of GNU Radio are you using; what OS/distribution/version are
you using; what (specific) kind of computer are you running GR on; if
you're using a USRP, what daugherboard(s) are you using; the exact
command line you used.  Also, please remember that no one here gets
paid to answer your questions.  Questions that demonstrate that
you've done your homework are more likely to elicit a response.

FYI, "FYI" stands for "for your information".  It's neither an error
nor a warning.  It's just information.

Welcome!
Eric


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Re: [Discuss-gnuradio] Simple Broadcast FM Receiver

[Martin DvH]

On Mon, 2009-01-26 at 17:04 +1300, Muhammad Abrar wrote:
> when i run this program ithe following ewrror appears, how can i resolve this.
> Nameerror: microtune_eval_board is not defined at line 70:
> 
> #!/usr/bin/env python
> 
> # simple broadcast FM receiver
> 
> 
> from GnuRadio import *
> 
> #
> # return a gr_FlowGraph
> #
> def build_graph (IF_freq):
> input_rate = 20e6
> 
> CFIR_decimate = 125
> RFIR_decimate = 5
> fm_demod_gain = 2200
> 
> quad_rate = input_rate / CFIR_decimate
> 
> audio_rate = quad_rate / RFIR_decimate
> 
> volume = 1.0
> 
> src = GrHighSpeedADCSourceS (input_rate)
> 
> # compute FIR filter taps for channel selection
> channel_coeffs = \
>   gr_firdes.low_pass (
> 
> 1.0,  # gain
> input_rate,   # sampling rate
> 250e3,# low pass cutoff freq
> 8*100e3,  # width of trans. band
> gr_firdes.WIN_HAMMING)
> 
> # input: short; output: complex
> 
> chan_filter = \
>   GrFreqXlatingFIRfilterSCF (CFIR_decimate,
>  channel_coeffs,
>  IF_freq)
> # input: complex; output: float
> fm_demod = \
> 
>   GrQuadratureDemodCF (volume * fm_demod_gain)
> 
> # compute FIR filter taps for audio filter
> width_of_transition_band = audio_rate / 32
> audio_coeffs = \
>   gr_firdes.low_pass (
> 1.0,# gain
> 
> quad_rate,  # sampling rate
> audio_rate/2 - width_of_transition_band,
> width_of_transition_band,
> gr_firdes.WIN_HAMMING)
> 
> # input: float; output: short
> audio_filter = \
> 
>   GrFIRfilterFSF (RFIR_decimate, audio_coeffs)
> 
> final_sink = GrAudioSinkS ()
> 
> fg = gr_FlowGraph ()
> 
> fg.connect (src, chan_filter)
> fg.connect (chan_filter, fm_demod)
> fg.connect (fm_demod, audio_filter)
> 
> fg.connect (audio_filter, final_sink)
> 
> return fg
> 
> if __name__ == '__main__':
> 
> # connect to RF front end
> rf_front_end = microtune_eval_board ()
> if not rf_front_end.board_present_p ():
> 
> raise IOError, 'RF front end not found'
> 
> # set gain and radio station frequency
> rf_front_end.set_AGC (300)
> rf_front_end.set_RF_freq (100.1e6)
> 
> IF_freq = rf_front_end.get_output_freq ()
> 
> fg = build_graph (IF_freq)
> fg.start ()# fork thread(s) and return
> raw_input ('Press Enter to quit: ')
> fg.stop ()
> 
> 
You are using a very very old version of gnuradio.
Please update to the current tarball or svn code:
http://gnuradio.org/trac/wiki/Download
http://gnuradio.org/trac/wiki/GettingStarted

Greetings,
Martin
> -- 
> Engr. Muhammad Abrar
> NewZealand
> Mob: 0064211204202
> Res: 006463586340
> ___
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio



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Re: [Discuss-gnuradio] Simple Broadcast FM Receiver

[Muhammad Abrar]

when i run this program i got this message.
stud...@it028743:~/Documents/usrp$ python usrp_wfm_rcv_pll.py
>>> gr_fir_ccf: using SSE
>>> gr_fir_fff: using SSE
>>> gr_fir_fcc: using SSE
FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
implementation yet
FYI: No Powermate or Contour Knob found
FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
implementation yet
aUaUaUaUFYI: This implementation of the stereo_carrier_pll_recovery has no
squelch implementation yet
FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
implementation yet
FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
implementation yet
FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
implementation yet
FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
implementation yet
FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
implementation yet
FYI: This implementation of the stereo_carrier_pll_recovery has no squelch
implementation yet
auauauauauauauauauauauauaustud...@it028743:~/Documents/usrp$


what its mean and how i can receive FM transmission.

2009/1/27 Eric Blossom 

> On Mon, Jan 26, 2009 at 05:04:04PM +1300, Muhammad Abrar wrote:
> > when i run this program ithe following ewrror appears, how can i resolve
> this.
> > Nameerror: microtune_eval_board is not defined at line 70:
>
> What hardware are you using?
>
> If it's a USRP, you'll be much better off running the examples we ship
> with the tarball.  E.g., usrp_wfm_rcv_pll.py
>
> The code you had below was written a long time ago (5 years?) --
> before the USRP existed.
>
> Current code:
>
>  http://gnuradio.org/trac/wiki/Download
>  http://gnuradio.org/trac/wiki/BuildGuide
>
> Eric
>



-- 
Engr. Muhammad Abrar
NewZealand
Mob: 0064211204202
Res: 006463586340
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Re: [Discuss-gnuradio] Simple Broadcast FM Receiver

[Eric Blossom]

On Mon, Jan 26, 2009 at 05:04:04PM +1300, Muhammad Abrar wrote:
> when i run this program ithe following ewrror appears, how can i resolve this.
> Nameerror: microtune_eval_board is not defined at line 70:

What hardware are you using?

If it's a USRP, you'll be much better off running the examples we ship
with the tarball.  E.g., usrp_wfm_rcv_pll.py

The code you had below was written a long time ago (5 years?) --
before the USRP existed.  

Current code:

  http://gnuradio.org/trac/wiki/Download
  http://gnuradio.org/trac/wiki/BuildGuide

Eric


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