Re: [Discuss-gnuradio] Higher sample rate

2015-11-22 Thread Garver, Paul W
You might try specrec in the gr-analysis module. It is optimized for fast writes but is Linux only. We routinely do 2.5 minute records at 25 MSPS sc16 format (100 Mbytes/sec sustained) with a b200 without typically dropping any samples. As mentioned, your hardware makes a big difference. We do t

Re: [Discuss-gnuradio] Late Packet Arrivals

2015-11-22 Thread Alexander Levedahl
Marcus, The USRP type is an X310. The UHD release is 3.8.4. The USRP does not have a GPSDO. I grep'ed the code for 'set_command_time', 'tx_metadata_t', 'set_time_now', 'set_time_next_pps', and 'set_time_unknown_pps' and got nothing. I have one block (in python) that sends (via asyncronous mess

Re: [Discuss-gnuradio] Late Packet Arrivals

2015-11-22 Thread Marcus Müller
Hi Alex, what's your USRP type? look for lines that are uspr->set_command_time, or where you have a uhd::tx_metadata_t and set a time_spec in that. Also, timed commands imply that you set a sensible time on the USRP, so look for any place that calls "set_time_now", "set_time_next_pps" or "set_ti

[Discuss-gnuradio] Frame Sync on Tag from Correlate Access Code Tag Block

2015-11-22 Thread Paul Garver
Is there a built-in GNURadio block/series of processing to frame sync by using the tag created by the correlate access code-tag output to some fixed frame length? Or is this functionality left up to the application-specific decoder? I’m analyzing a signal which I don’t know certain parameters bu

[Discuss-gnuradio] Late Packet Arrivals

2015-11-22 Thread Alexander Levedahl
Hello, I have an application that is spewing up 'L's indicating late packet arrival at the destination. How can I go about investigating this problem (e.g., how do I determine what the time of transmission is in the packet and the time it is received by the ettus box)? I have not done much work