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 >
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