Re: [USRP-users] UBX vs SBX
I found that UBX has a bit less of spurs. I assume it is because the whole daughterboard is covered by heatsink panel that plays a role of EMI shield while SBX is open. thanks, Dmitry From: Hojoon Yang via USRP-users Sent: 14 марта 2018 г. 9:23 To: usrp-users@lists.ettus.com Subject: [USRP-users] UBX vs SBX Hi. I have two USRP X310s and wonder which board between SBX and UBX would be the suitable for me. I'm gonna buy four daughterboards to use it as 2x2 MIMO. One USRP X310 for Tx, the other USRP for Rx. My target frequency is from 1.8GHz to 2.8GHz. According to datasheet, Both UBX and SBX work on the target frequency. I saw the schematic of both SBX and UBX and figured it out that UBX has a significantly different structure from SBX. I wonder, which board performs better "in the target frequency" in terms of MIMO performance(i.e. phase align accuracy, noise level, etc..). I don't have price issue. If the UBX performs better or same as the SBX in target frequency(1.8GHz~2.8GHz), I would like to buy UBX since it has more wide frequency range. Regards, ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
Re: [USRP-users] UBX vs SBX
Hello Hojoon Yang,
Both SBX and UBX will work fine (*Assuming X3x0 series only, no N2x0 or older
boards).
You can align the phase of the UBX and SBX boards by using the timed commands (
https://kb.ettus.com/Synchronization_and_MIMO_Capability_with_USRP_Devices ) ,
but you will have to correct (manually calibrate) a constant phase offset
between the channels. Also, the accuracy of the alignment over time is not
guaranteed by Ettus Research. ("Periodic calibration will be necessary for
phase-coherent applications" - src:
https://files.ettus.com/manual/page_sync.html ). So, I recommend against
relying on the phase alignment accuracy of the daughterboards.
Other RF performance data (noise figure, etc) is available at:
http://files.ettus.com/performance_data/ . Please note that you can'not' always
use the max receive gain settings, due to the possible nonlinearity issues.
Personally, I like the UBX boards better than the SBX boards. But both are
generally suitable for such experiments.
Regards,
Kyeong Su Shin
보낸 사람: Hojoon Yang via USRP-users <usrp-users@lists.ettus.com> 대신 USRP-users
<usrp-users-boun...@lists.ettus.com>
보낸 날짜: 2018년 3월 14일 수요일 오후 3:20:56
받는 사람: usrp-users@lists.ettus.com
제목: [USRP-users] UBX vs SBX
Hi.
I have two USRP X310s and wonder which board between SBX and UBX would be the
suitable for me.
I'm gonna buy four daughterboards to use it as 2x2 MIMO. One USRP X310 for Tx,
the other USRP for Rx.
My target frequency is from 1.8GHz to 2.8GHz. According to datasheet, Both UBX
and SBX work on the target frequency.
I saw the schematic of both SBX and UBX and figured it out that UBX has a
significantly different structure from SBX.
I wonder, which board performs better "in the target frequency" in terms of
MIMO performance(i.e. phase align accuracy, noise level, etc..).
I don't have price issue. If the UBX performs better or same as the SBX in
target frequency(1.8GHz~2.8GHz), I would like to buy UBX since it has more wide
frequency range.
Regards,
___
USRP-users mailing list
USRP-users@lists.ettus.com
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
[USRP-users] UBX vs SBX
Hi.I have two USRP X310s and wonder which board between SBX and UBX would be the suitable for me.I'm gonna buy four daughterboards to use it as 2x2 MIMO. One USRP X310 for Tx, the other USRP for Rx.My target frequency is from 1.8GHz to 2.8GHz. According to datasheet, Both UBX and SBX work on the target frequency.I saw the schematic of both SBX and UBX and figured it out that UBX has a significantly different structure from SBX.I wonder, which board performs better "in the target frequency" in terms of MIMO performance(i.e. phase align accuracy, noise level, etc..).I don't have price issue. If the UBX performs better or same as the SBX in target frequency(1.8GHz~2.8GHz), I would like to buy UBX since it has more wide frequency range.Regards,___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
