Re: [Discuss-gnuradio] calcualted vs observed pulse length
seph 004 wrote: This would mean that to obtain a total rate of 32 Msamples/sec to the DAC, the data rate of the I and Q channels would have to be 16 Msamples/sec each, and thus 128 000 samples/sec each into the txchain modules. This should mean that if I provide a samples set of 128 I samples, and 128 Q samples, I should get 1 msec worth of complex output signal. The bus carrying IQ data to the 9862 TX runs at 64 MHz, so it is 32 MS/s for each. Matt ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] calcualted vs observed pulse length
I've managed to store a sample set on the FPGA and transmit it periodically. The problem I'm experiencing is that the transmitted pulse is shorter than what I expected. I worked out that by setting an interp value of 500 from python, that the FPGA interpolator would basically be set to 125 to go with the AD9860s x4. This would mean that to obtain a total rate of 32 Msamples/sec to the DAC, the data rate of the I and Q channels would have to be 16 Msamples/sec each, and thus 128 000 samples/sec each into the txchain modules. This should mean that if I provide a samples set of 128 I samples, and 128 Q samples, I should get 1 msec worth of complex output signal. Is this correct? I'm not sure if I overlooked something. The result I get when monitoring the output is about 750 microseconds instead of 1 msec. Is there perhaps something I didn't take into account in the calculations? If anyone can assist it would be greatly appreciated. Regards Lance - Don't pick lemons. See all the new 2007 cars at Yahoo! Autos.___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
