It would depend on the daughterboard being used with the X300 I believe. Which daughterboard are you using?
Brian On Tue, Oct 16, 2018 at 7:23 PM Ryan Marlow <r...@lmarlow.com> wrote: > 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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