Hi Marcus, >> It seems to make a difference if set_tx_bandwidth is called before or >> after get_tx_stream. >> >> In the example programs, they all seem to do it before, however, it >> appears to work better afterwards. Please see the attached two >> programmes, which are basically just your tx_samples_c program, except >> I've added in calls to set_tx_bandwidth and set samples to 0. >> >> I run with the args: -f 868300000 -g 89 -r 6000000 >> >> For lo_leakage_pre.c where bandwidth is set before get_tx_stream, >> carrier is at -1dBm. For lo_leakage_post.c, where bandwidth is set to >> 56M before get_tx_stream, then 6M afterwards, carrier is at -30dBm. >> >> >Yup, so the default behavior in UHD for B2xx is to set the analog bandwidth > to be commensurate with sample-rate, and that is done inside the > parts of UHD that set sample rate--sample-rate setting is done before > you create a stream. > >So a set-bandwidth call will only have an effect *after* the sample-rates are > established.
Sorry, but I don't follow. The order in the example programs is: set_tx_rate set_tx_freq set_tx_bandwidth get_tx_stream So bandwidth is set after tx_rate, but before getting the tx_stream. However, this seems to result in large LO leakage on my B210. What seems to work better, is: set_tx_rate set_tx_freq set_tx_bandwidth(56e6) get_tx_stream set_tx_bandwidth(desired) Does that make sense to you? The software I'm working on should ideally work with any USRP device, so how can it be written to support all devices? Thanks, Jon _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
