Hey Brian, Thanks for the suggestion. I think that idea should work for me. Is there anywhere that documents the X300 TX ramp up time? Best, Ryan
On Tue, Oct 16, 2018 at 6:28 PM, Brian Padalino <bpadal...@gmail.com> wrote: > Maybe ramp up time for the transmitter? > > If you send 2.5us worth of 0's before your 1000 samples, do you see the > appropriate number of pulse burst length? > > This method would be a compromise between the two methods you described. > Does that work for you? > > Brian > > On Tue, Oct 16, 2018 at 6:19 PM Ryan Marlow via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> Hey All, >> I am trying to transmit a series of pulses with the X300 and am seeing >> some odd behavior. I want to transmit a set number of samples in a pulse, >> let's say 1000. At 200 MSPS (the tx rate in the radio core) I would expect >> this burst to last approximately 5us. Yet, when I receive the data, I see a >> burst that is shorter by half, approx 2.5 us. To send these bursts, I am >> sending a timed burst of 1000 samples to the Radio with significant space >> in between. Odder still, when I increase my pulse to 2000 samples, >> expecting a pulse of 10 us, it is shortened again by 2.5 us, making the >> pulse 7.5 us. I can confirm with an ILA that the Radio core is receiving >> all pulsed samples and they are passed to the daughterboard interface. Is >> there an obvious explanation for this behavior that I am overlooking? >> One solution I have devised is generating a constant stream of data in >> place of the gaps between pulses that contain zero'd data. So it would look >> like this >> Data x 1000 -> zeroes in place of gaps -> repeat. >> In my original method, the transmitter is only active during the pulses. >> In the alternative solution, the transmitter is active the whole time. >> This solution gives me the behavior that I want but I am curious as to >> why the pulses are shortened. >> >> Thanks, >> Ryan Marlow >> >> -- >> Ryan L. Marlow >> R L Marlow Consulting LLC >> rlmarlow.com >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> > -- Ryan L. Marlow R L Marlow Consulting LLC rlmarlow.com
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