On Wed, Jul 9, 2008 at 11:40 AM, Chris Stankevitz <[EMAIL PROTECTED]> wrote:
> I am troubleshooting a problem with my GPS receiver. Is it possible to > collect some 64 MHz data? I understand the collect will not be long because > USB2 can't handle the bandwidth, but perhaps buffers on the USRP will allow > me to make a 1ms collect? You would have to modify the FPGA code to do so, but it is indeed possible if not trivial. The gr-radar-mono code does this (there are of course a lot of unrelated customizations to the FPGA code as well). During the interval in time the USRP is listening for radar echos, is streams data at 64 Msps into a new FIFO, which accepts 1 sample per clock. This FIFO is connected to the existing rx_buffer FIFO, which then streams out the USB at 1 sample per 8 clocks. This implies it can only sample at a maximum of 12.5% duty cycle. (The radar code uses the gap to send its transmit pulse out and wait for the range gate to arrive.) Probably not what you wanted to hear :) -- Johnathan Corgan Corgan Enterprises LLC http://corganenterprises.com/ _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
