On 06/28/2019 05:10 AM, Jaya Thota wrote:
Thanks Marcus. Shall I perform the calibration (uhd_cal_tx_iq_balance
, uhd_cal_tx_dc_offset ) with 30dB attenuator connected between TX/RX
and RX? Do you this will help?
No, leave the ports unconnceted when you are doing the CAL sequence.
*From:*USRP-users <usrp-users-boun...@lists.ettus.com> *On Behalf Of
*Robin Coxe via USRP-users
*Sent:* 27 June 2019 19:07
*To:* Marcus D. Leech <patchvonbr...@gmail.com>
*Cc:* Ettus Mail List <usrp-users@lists.ettus.com>
*Subject:* Re: [USRP-users] X310 with CBX 120 daughter board looses
uplink RF Connection
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
<usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>> 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 <http://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
<http://www.mimecast.com>
------------------------------------------------------------------------
_______________________________________________
USRP-users mailing list
USRP-users@lists.ettus.com <mailto:USRP-users@lists.ettus.com>
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
_______________________________________________
USRP-users mailing list
USRP-users@lists.ettus.com <mailto:USRP-users@lists.ettus.com>
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
------------------------------------------------------------------------
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 list
USRP-users@lists.ettus.com
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
