Hi Johnathan,
I'm doing something similar as you did in gr-sounder project, sending a code modulated as BPSK with the suppplied center frequency, but different code (which contains 1 and -1 also), and bandwith for the code, which is 32kHz instead of 32MHz. I used the clk_divider block to down the frequency to 32kHz, then I monitored the signal from the antenna part on daughterboard by an oscilloscope. The waveform of the signal is a nicer sinusoid wave, but it doesn't show the phase shift for -1 part in the sequence. I'm not sure if it's clear. If not, I will post some photos of the oscilloscope, but it just a continued sine wave without any phase shift for BPSK modulation. Thank you so much! Regards, Yan ----- Original Message ----- From: Johnathan Corgan <jcor...@corganenterprises.com> Date: Thursday, January 28, 2010 7:19 am Subject: Re: [Discuss-gnuradio] tx frequency changing by clk_divider To: Yan Nie <yn...@uwo.ca> Cc: discuss-gnuradio@gnu.org > On Wed, Jan 27, 2010 at 15:08, Yan Nie <yn...@uwo.ca> wrote: > > > The major problem of the frequency decreasing is the > transmitting signal > > from the antenna doesn't show the result of BPSK modulation in > the waveform > > of the signal. Could you please give some suggestions about > what the > > problem? > > I'd like to help you out with this, as I wrote the original gr-sounder > FPGA code, but to be honest I have no idea what you've done or what > issue you are seeing with it. > > Could you perhaps elaborate with the kinds of extensions you have > written to it, maybe a description of your signal flow, post > links to > screenshots of your lab equipment displays, or something more concrete > than what you have written above? > > What is it doing that it shouldn't be, or what isn't it doing > that it should? > > Johnathan
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