One debugging technique you could try would be to connect Tx to Rx directly via an SMA cable with ~30dB of inline attenuation to eliminate any RF propagation effects.
On Thu, Jun 27, 2019 at 10:58 AM Marcus D. Leech via USRP-users < [email protected]> wrote: > On 06/27/2019 12:22 PM, Jaya Thota via USRP-users wrote: > > > > Hi all, > > > > I have a two X310 with CBX-120 daughter board running on UHD version > 3.13.0 on Ubuntu 16.04. > > I am using it to tx/rx LTE 5MHz BW and 10 MHz BW signals at 2.85MHz using > directional LP0965 antennas. > > However after few minutes the USRP looses uplink RF connection. > > > > Do I need to calibrate them? > > I did send the following commands without any RF connectors to calibrate. > But I have the same issue. > > The master clock rate for LTE is 184.32e6 Hz. Do I need to send this as > well. > > Any suggestions will be helpful. > > 1. sudo uhd_cal_rx_iq_balance --verbose --args="addr=192.168.40.2" > --freq_start 2.4e9 --freq_stop 2.9e9 --freq_step 1e6 > > 2. sudo uhd_cal_tx_iq_balance --verbose --args="addr=192.168.40.2" > --freq_start 2.4e9 --freq_stop 2.9e9 --freq_step 1e6 > > 3. sudo uhd_cal_tx_dc_offset --verbose --args="addr=192.168.40.2" > --freq_start 2.4e9 --freq_stop 2.9e9 --freq_step 1e6 > > > > Regards > > Jaya > > There are a LOT of reasons for a complex system like LTE to lose its RF > link. Does the underlying LTE application provide any hints? > Perhaps a debugging mode? > > This likely IS NOT related to underlying UHD or hardware, per se, but > probably some environmental issue, and the app should be able to help > you debug it. > > > > ------------------------------ > > NOTE: The information in this email and any attachments may be > confidential and/or legally privileged. This message may be read, copied > and used only by the intended recipient. If you are not the intended > recipient, please destroy this message, delete any copies held on your > system and notify the sender immediately. > > Toshiba Research Europe Limited, registered in England and Wales > (2519556). Registered Office 208 Cambridge Science Park, Milton Road, > Cambridge CB4 0GZ, England. Web: www.toshiba.eu/research/trl > > > > ------------------------------ > This email has been scanned for email related threats and delivered safely > by Mimecast. > For more information please visit http://www.mimecast.com > ------------------------------ > > > _______________________________________________ > USRP-users mailing > [email protected]http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
_______________________________________________ USRP-users mailing list [email protected] http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
