Thank you! The sample delay induced by the filter taps makes sense. Is there a best practice that folks go with to deal with this or is it so insignificant that people don't care? I was thinking of either requesting 10 more samples and skipping the first 10 when writing to the filesystem / reading them into the software that consumes them.
On Thu, Nov 7, 2024 at 3:03 PM Marcus D. Leech <patchvonbr...@gmail.com> wrote: > On 07/11/2024 14:53, Chris Wozny wrote: > > I had noticed that the first ten samples of my application were always > > coming up as zero regardless of whether it was 8-bits on host or > > 16-bits on host. I went down the path of trying to reproduce a minimal > > example to share with this mailing list, however I then realized that > > even the example "rx_timed_samples.cpp" was also producing the same > > results. This occurred with two different b200minis and a B210 with > > UHD 4.7.0.0. I had to de-boostify the source code to run on my system > > and specify a center frequency and receive gain, but am able to > > reproduce this issue every time. I've confirmed that a signal is > > present by using a signal generator for one setup and also with an OTA > > setup tuned to 2421 MHz with AGC disabled and receive gain set to 70 dB. > > > > Has anyone observed this issue or can anyone else reproduce it using > > the timed receive example as well? Sorry if I am missing critical > > details that would help diagnose the issue, let me know if any > > additional information would be helpful. > > > > - Chris > > > The signal must necessarily pass through some digital filtering on the > way between the antenna and your application. > Those digital filters have a certain length, and thus group delay. > That filter must necessarily have *some* value already > in it prior to your samples being presented to it. > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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