Re: [Discuss-gnuradio] Re ceiving DBPSK side not working.
Am going to work on it today and see if I get any results from the previous replys. Below the setting that are currently being used but I am changing the interpolation and decimation rates. 4k. Gain=20. Freq= 100.1MHz Board is tvrx Version 3.3 gnuradio and 0.7 grc Ismael Tom Rondeau wrote: On Tue, Apr 19, 2011 at 2:35 PM, ish13 ish2...@gmail.com wrote: Ok I had used the muliplier in a previous code using Frequency Modulation which is why I used it again. But thanks for that. I will change it to a smaller value. I also had it set up with the interpolation to 512 and the decimation to 256 but it didn't work either. Though I will set these values to the range it has to fall between. As for the transmitter, I had connected the output of the modulation block to a scope to see if it was transmitting the correct waveform, which it was. Though the problem came when I try to receive. When I tune into the frequency I am transmitting at there is no signal at all, which I am not sure why that is happening. Ismael Just connecting to the scope inside the transmitter isn't likely to tell you too much. You want to see it at the receiver. The fact that you are not seeing it at the receiver helps. What interpolation are you using at the transmitter when looking for the received signal? What gain settings? What frequency? What daughterboards are you using? What version of GNU Radio and GRC? Tom Tom Rondeau wrote: On Tue, Apr 19, 2011 at 2:03 PM, ish13 ish2...@gmail.com wrote: I am using DBPSK, but I am not receiving anything when I transmit my signal. I attached the flow-graphs from the companion. Can someone look through it and tell me if it is correct? Thanks Ismael http://old.nabble.com/file/p31434999/Receiver.png Receiver.png http://old.nabble.com/file/p31434999/Transmitter.png Transmitter.png A few issues. First, don't set the multiplier to 32k as you will probably start to over drive the amplifier. I tend to keep this at a max of 15k. More importantly, though, you're interpolation and decimations are set to 4k and 2k, respectively. You cannot use this large of a number. The max (if I recall) are 512 for interp and 256 for decim. It's also helpful to start the transmitter and use the usrp_fft.py program to make sure you are receiving what you think you are receiving. Tom ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- View this message in context: http://old.nabble.com/Receiving-DBPSK-side-not-working.-tp31434999p31435221.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- View this message in context: http://old.nabble.com/Receiving-DBPSK-side-not-working.-tp31434999p31451604.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Re ceiving DBPSK side not working.
No I am using TVRX to receive and basic TX to transmit. I have changed the following values, Receive. Decimation=256 gain = 20 Transmitter. Interpolation= 512 Multiply Const=5000 I am now receiving my audio file and saving the data into another file. Though the data is not the just the file data because the play back of the song it has a lot of noise. But sorry I have version 3.3. Ismael Tom Rondeau wrote: On Thu, Apr 21, 2011 at 2:14 PM, ish13 ish2...@gmail.com wrote: Am going to work on it today and see if I get any results from the previous replys. Below the setting that are currently being used but I am changing the interpolation and decimation rates. 4k. Gain=20. Freq= 100.1MHz Board is tvrx Version 3.3 gnuradio and 0.7 grc Ismael You are trying to transmit using a TVRX? That's a receive-only board. That's also a really old version of GRC. Tom Tom Rondeau wrote: On Tue, Apr 19, 2011 at 2:35 PM, ish13 ish2...@gmail.com wrote: Ok I had used the muliplier in a previous code using Frequency Modulation which is why I used it again. But thanks for that. I will change it to a smaller value. I also had it set up with the interpolation to 512 and the decimation to 256 but it didn't work either. Though I will set these values to the range it has to fall between. As for the transmitter, I had connected the output of the modulation block to a scope to see if it was transmitting the correct waveform, which it was. Though the problem came when I try to receive. When I tune into the frequency I am transmitting at there is no signal at all, which I am not sure why that is happening. Ismael Just connecting to the scope inside the transmitter isn't likely to tell you too much. You want to see it at the receiver. The fact that you are not seeing it at the receiver helps. What interpolation are you using at the transmitter when looking for the received signal? What gain settings? What frequency? What daughterboards are you using? What version of GNU Radio and GRC? Tom Tom Rondeau wrote: On Tue, Apr 19, 2011 at 2:03 PM, ish13 ish2...@gmail.com wrote: I am using DBPSK, but I am not receiving anything when I transmit my signal. I attached the flow-graphs from the companion. Can someone look through it and tell me if it is correct? Thanks Ismael http://old.nabble.com/file/p31434999/Receiver.png Receiver.png http://old.nabble.com/file/p31434999/Transmitter.png Transmitter.png A few issues. First, don't set the multiplier to 32k as you will probably start to over drive the amplifier. I tend to keep this at a max of 15k. More importantly, though, you're interpolation and decimations are set to 4k and 2k, respectively. You cannot use this large of a number. The max (if I recall) are 512 for interp and 256 for decim. It's also helpful to start the transmitter and use the usrp_fft.py program to make sure you are receiving what you think you are receiving. Tom ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- View this message in context: http://old.nabble.com/Receiving-DBPSK-side-not-working.-tp31434999p31435221.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- View this message in context: http://old.nabble.com/Receiving-DBPSK-side-not-working.-tp31434999p31451604.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- View this message in context: http://old.nabble.com/Receiving-DBPSK-side-not-working.-tp31434999p31452250.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Re ceiving DBPSK side not working.
I am using DBPSK, but I am not receiving anything when I transmit my signal. I attached the flow-graphs from the companion. Can someone look through it and tell me if it is correct? Thanks Ismael http://old.nabble.com/file/p31434999/Receiver.png Receiver.png http://old.nabble.com/file/p31434999/Transmitter.png Transmitter.png -- View this message in context: http://old.nabble.com/Receiving-DBPSK-side-not-working.-tp31434999p31434999.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Re ceiving DBPSK side not working.
Ok I had used the muliplier in a previous code using Frequency Modulation which is why I used it again. But thanks for that. I will change it to a smaller value. I also had it set up with the interpolation to 512 and the decimation to 256 but it didn't work either. Though I will set these values to the range it has to fall between. As for the transmitter, I had connected the output of the modulation block to a scope to see if it was transmitting the correct waveform, which it was. Though the problem came when I try to receive. When I tune into the frequency I am transmitting at there is no signal at all, which I am not sure why that is happening. Ismael Tom Rondeau wrote: On Tue, Apr 19, 2011 at 2:03 PM, ish13 ish2...@gmail.com wrote: I am using DBPSK, but I am not receiving anything when I transmit my signal. I attached the flow-graphs from the companion. Can someone look through it and tell me if it is correct? Thanks Ismael http://old.nabble.com/file/p31434999/Receiver.png Receiver.png http://old.nabble.com/file/p31434999/Transmitter.png Transmitter.png A few issues. First, don't set the multiplier to 32k as you will probably start to over drive the amplifier. I tend to keep this at a max of 15k. More importantly, though, you're interpolation and decimations are set to 4k and 2k, respectively. You cannot use this large of a number. The max (if I recall) are 512 for interp and 256 for decim. It's also helpful to start the transmitter and use the usrp_fft.py program to make sure you are receiving what you think you are receiving. Tom ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- View this message in context: http://old.nabble.com/Receiving-DBPSK-side-not-working.-tp31434999p31435221.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Digital Modulation and Demodulation
I am trying to test the DBPSK modulation and demodulation but I don't understand the output. I read a binary file and modulate, then demodulate, and then write to a file. I view the file but it is not the same as the original file. Can someone help with what I should do. Thanks -- View this message in context: http://old.nabble.com/Digital-Modulation-and-Demodulation-tp31076987p31076987.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Help with Code
Can someone please help and tell me what is wrong with my code. My idea is to create a sine wave-modulate-demodulate-display on scope. I get the following error below. Can some explain why? Also is my idea of my flow graph a correct way to see if I get back the signal that was created? Thanks Ismael RuntimeError: iir_filter_ffd(14): insufficient connected output ports (1 needed, 0 connected) Transmit 1 signal. Outputs SSB (USB) signals on side A and side B at frequencies specified on command line. Side B is 350 + 440 Hz tones. from gnuradio import gr from gnuradio.eng_notation import num_to_str, str_to_num from gnuradio import usrp from gnuradio import audio from gnuradio import blks2 from gnuradio.eng_option import eng_option from optparse import OptionParser from usrpm import usrp_dbid from gnuradio.wxgui import stdgui2, scopesink2, form, slider import wx import math import sys class dialtone_signal1(gr.hier_block2): tone (440 Hz). def __init__(self, sample_rate): gr.hier_block2.__init__(self, dialtone_signal1, gr.io_signature(0, 0, gr.sizeof_float), # Input signature gr.io_signature(1, 1, gr.sizeof_float)) # Output signature src1 = gr.sig_source_f (sample_rate,# sample rate gr.GR_SIN_WAVE, # waveform type 440,# frequency 1.0,# amplitude 0) # DC Offset self.connect(src1,self) class my_top_block(stdgui2.std_top_block): def __init__(self, frame, panel, vbox, argv): stdgui2.std_top_block.__init__(self, frame, panel, vbox, argv) self.frame = frame self.panel = panel usage=%prog: [options] side-A-tx-freq side-B-tx-freq parser = OptionParser (option_class=eng_option, usage=usage) parser.add_option(-T, --tx-subdev-spec, type=subdev, default=None, help=select USRP Tx side A or B) parser.add_option(-r, --sample-rate, type=eng_float, default=48000, help=set sample rate to RATE (48000)) parser.add_option(-O, --audio-output, type=string, default=, help=pcm output device name. E.g., hw:0,0 or /dev/dsp) parser.add_option(-n, --frame-decim, type=int, default=1, help=set oscope frame decimation factor to n [default=1]) parser.add_option(-v, --v-scale, type=eng_float, default=1000, help=set oscope initial V/div to SCALE [default=%default]) parser.add_option(-t, --t-scale, type=eng_float, default=49e-6, help=set oscope initial s/div to SCALE [default=50us]) (options, args) = parser.parse_args () sample_rate = int(options.sample_rate) self.audio_rate = 320e3 // 10 print Enter Carrier frequency: (XXX.X) freq= float(raw_input())*1e6 self.source1 = dialtone_signal1(sample_rate) dst = audio.sink (sample_rate, options.audio_output) self.modulator = blks2.wfm_tx(self.audio_rate, 320e3) self.demodulator = blks2.wfm_rcv(320e3,int(self.audio_rate)) self.scope = scopesink2.scope_sink_c(panel, sample_rate=48e3, frame_decim=options.frame_decim, v_scale=options.v_scale, t_scale=options.t_scale, num_inputs=1) self.connect(self.source1,self.modulator,self.demodulator,self.scope) vbox.Add(self.scope.win, 10, wx.EXPAND) def set_freq(self, target_freq): Set the center frequency we're interested in. @param side: 0 = side A, 1 = side B @param target_freq: frequency in Hz @rtype: bool Tuning is a two step process. First we ask the front-end to tune as close to the desired frequency as it can. Then we use the result of that operation and our target_frequency to determine the value for the digital up converter. print Tuning side A to %sHz % num_to_str(target_freq) r = self.u.tune(self.subdev.which(), self.subdev, target_freq) if r: print r.baseband_freq =, num_to_str(r.baseband_freq) print r.dxc_freq =, num_to_str(r.dxc_freq) print r.residual_freq =, num_to_str(r.residual_freq) print r.inverted =, r.inverted print OK return True else: print Failed! return False if __name__
[Discuss-gnuradio] Error when installing Boost
I get an error with I use ./configure when I am installing boost. The following commands are entered in the terminal when I am installing. cd boost_1_44_0 BOOST_PREFIX=/opt/boost_1_44_0 ./tools/jam/src/boehm_gc/configure --prefix=$BOOST_PREFIX --with-libraries=thread,date_time,program_options confchecking if f77 PIC flag -fPIC works... yes checking if f77 static flag -static works... yes checking if f77 supports -c -o file.o... yes checking whether the f77 linker (/usr/bin/ld) supports shared libraries... yes checking dynamic linker characteristics... /usr/bin/f77: Illegal option: -print-search-dirs GNU/Linux ld.so checking how to hardcode library paths into programs... immediate checking sys/dg_sys_info.h usability... no checking sys/dg_sys_info.h presence... no checking for sys/dg_sys_info.h... no checking whether Solaris gcc optimization fix is necessary... no checking atomic_ops.h usability... no checking atomic_ops.h presence... no checking for atomic_ops.h... no configure: error: Missig libatomic_ops. Can someone help? Thanks Ismael -- View this message in context: http://old.nabble.com/Error-when-installing-Boost-tp30015069p30015069.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Error when installing Boost
I am new at this. But I was just following the instructions that are on the wiki page. It said that boost needed to be installed. So I was following the steps and I ran into the error message. Which approach am I supposed to take to complete the installation of gnu radio. Ismael Eric Blossom wrote: On Wed, Oct 20, 2010 at 04:47:47PM -0700, ish13 wrote: I get an error with I use ./configure when I am installing boost. The following commands are entered in the terminal when I am installing. Why are you building boost? It's packaged for pretty much every reasonably modern distribution. cd boost_1_44_0 BOOST_PREFIX=/opt/boost_1_44_0 ./tools/jam/src/boehm_gc/configure --prefix=$BOOST_PREFIX --with-libraries=thread,date_time,program_options confchecking if f77 PIC flag -fPIC works... yes checking if f77 static flag -static works... yes checking if f77 supports -c -o file.o... yes checking whether the f77 linker (/usr/bin/ld) supports shared libraries... yes checking dynamic linker characteristics... /usr/bin/f77: Illegal option: -print-search-dirs GNU/Linux ld.so checking how to hardcode library paths into programs... immediate checking sys/dg_sys_info.h usability... no checking sys/dg_sys_info.h presence... no checking for sys/dg_sys_info.h... no checking whether Solaris gcc optimization fix is necessary... no checking atomic_ops.h usability... no checking atomic_ops.h presence... no checking for atomic_ops.h... no configure: error: Missig libatomic_ops. Can someone help? Thanks Ismael ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- View this message in context: http://old.nabble.com/Error-when-installing-Boost-tp30015069p30016337.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Usrp Runtime Error
Hi, I am using the usrp_wfm_rcv_nogui program to listen to FM radio. I have also added code to the program so that I can perform a scan, for stations in my area. My code works by first creating a usrp_source() for the FM code. When I want to scan for stations I press a button on my keyboard and then it stops the fm code from running by using tb.stop(). I then remove the flowgraph from tb so that the usrp source is not in use. The code then creates a new usrp_source() and scans frequency band. I then stop the scan code with scan.stop(). The code then does the same procedure as the FM code did to stop the source. When I return back to start the FM code again I get a RunTimeError: can't open usrp. I don't understand why I am getting this error if I have used the source once, stop that source, removed the source and then created a new one. Help is greatly appreciated. -- View this message in context: http://old.nabble.com/Usrp-Runtime-Error-tp29473867p29473867.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] getting FM radio signal strength
Ok I will look into that. Another question... I am not sure if you have seen the code for the usrp_wfm_rcv.py code but in the code there is a little section where it builds a FFT plot and displays the date. Do you know if there is anyway of getting the data that it is plotting? Thanks ish13 wrote: Is there any way I can get the signal strength from a radio station that it is being tuned into? I am trying to implement a scan mode so I can get all the FM stations. -- View this message in context: http://old.nabble.com/getting-FM-radio-signal-strength-tp29281935p29288173.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] getting FM radio signal strength
Is there any way I can the signal strength from a radio station that it is tuning into? I am trying to implement a scan mode so I can get all the FM stations. -- View this message in context: http://old.nabble.com/getting-FM-radio-signal-strength-tp29281935p29281935.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
