On 12/11/2017 03:12 AM, 周 亮 via USRP-users wrote:
Hi,
Thanks for the reply!
For the moment, if I upgrade to latest version of UHD, my programe
does not work properly(lots of LLLLLL). Therefore I could not tell if
it helps or not.
The "L" indicator indicates *late* samples--you are setting a send time
on your bursts and by the time the burst arrives at the USRP, that
time has already passed. Make sure that you are properly
synchronized in time with the USRP in scheduling bursts.
One burst is about half millisecond. I thought it is long enough, is it?
500usec should be long enough, yes. There'll be a few usec of
transition time at the beginning.
Regards!
Liang
------------------------------------------------------------------------
*发件人:* USRP-users <usrp-users-boun...@lists.ettus.com> 代表 Marcus
D. Leech via USRP-users <usrp-users@lists.ettus.com>
*发送时间:* 2017年12月11日 8:13
*收件人:* usrp-users@lists.ettus.com
*主题:* Re: [USRP-users] Weak power with X310 and ubx160 with TDD system.
On 12/09/2017 08:27 AM, 周 亮 via USRP-users wrote:
Hi,
I build a TDD system with X310 and ubx160 v2, which uses TX/RX for
both TX and RX. However I found the TX output power is extremely
weak. Then I tried to assign RX2 as receiver anteena and I get
approximately 20dB stronger TX signal with almost same code. The main
difference is: for two anteena case, in each subframe TX send one
burst, while in one anteena case, TX just sends zeros instead of
stoping transmission. The installed uhd version is 3.9.7.
Does anybody know what could possibly be reason for this? And how
could I achieve full power with single anteena TDD system?
Thank you!
Are you able to upgrade to a newer UHD version? Does that help?
How long are your bursts? Is it possible that they're shorter than
the switching time?
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