This is merely a historical archive of years 2008-2021, before the migration to mailman3.
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Eric Wild ewild at sysmocom.deHi Sebastian, since the hackrf is half-duplex and has no timestamp support (only continuous streaming) the buffer size was chosen at the time to provide a reasonable tradeoff between latency and performance for higher sample rates - I suppose you could just decrease it if that is the problem, but there is still no way to just send something immediately, there will always be a considerable latency between the host and the rf output. -Eric Am 09.12.2020 um 13:23 schrieb Sebastian Böhm: > > Does anyone have any idea what could be the reason for this behavior? > > Am 01.12.2020 um 16:28 schrieb Sebastian Böhm: >> Hi, >> >> i try to transmit 2.48 ghz radio packets (beacons) at a fixed time >> interval (e.g. every 1 s) via hackrf using the osmocom sink in >> gnuradio. Without exception, the beacons are all received by my >> sniffer "golden device" hardware, but burst. >> >> It seems that the packets are only transferred via USB to the hackrf >> device hardware when the buffer with the fixed BUF_LEN 262144 >> (32*16*512) is completely filled. For my setup this are e.g. 18 >> beacon frames, which are transmitted as burst. When I look at the USB >> interface, I can see this burst of data every 18 seconds in a full >> USB request block (URB) of size 262144 byte. All other URBs (also of >> size 262144 - every approx. 200us) transferred via USB are filled >> with zeros only. So this burst behavior should be caused by gnuradio. >> >> How can I achieve that the complex data of the osmocom sink's input >> is immediately (with the next URB) transferred to the hackrf >> hardware? Am I missing any options of the GRC module? >> >> Thank You in advance! >> >> Regards, >> Sebastian >> -- >> __________________________________________________________ >> >> Sebastian Boehm >> Brandenburg University of Technology Cottbus - Senftenberg >> Computer Networks Communication Systems Group >> >> E-Mail: sebastian.boehm at b-tu.de <mailto:Sebastian.Boehm at b-tu.de> >> >> P.O. Box: 10 13 44 >> D-03013 Cottbus >> GERMANY -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20201209/ac3041e6/attachment.htm>