Hi Jason,
First question what are you tring to do, receive or/and transmitt?
Second: Why is 4 (2TX x 2RX) antennas needed if I understood you correctly?
If you have two USRP(N)'s, I'd connect them to two different machines. You can
connect both USRP's to the same if you got a robust machine.
Tell us a little (alot) more about your attempts.....
Patrik
----- Original Message -----
From: Scott Storck
To: Jason Abele
Cc: discuss-gnuradio@gnu.org
Sent: Friday, September 10, 2010 22:59
Subject: Re: [Discuss-gnuradio] 4 RX with 2 WBXs?
Jason and Marcus, thanks for your responses. I was afraid that this was the
case.
Is there a daughterboard out there (besides the BasicRX) that can support 4
antennas on a single USRP?
The other option that would work for me is connecting antenna 0 to WBX 0 and
connecting antennas 1-3 to WBX 1 through a commutator to switch them at a sub-1
kHz frequency. Can you tell me if any of the unpopulated headers on the WBX
board are digital outputs that could potentially be used to generate a
switching signal and/or low rate ADC inputs that could be used to sample a
switching signal generated elsewhere?
Finally, what it would take for 2 USRPs to operate a total of 4 WBXs
coherently? I assume this would at least require connecting Clock Out on USRP0
to Clock In on USRP1, but is that enough to get all 4 WBX PLLs locked together?
Also, does using two USRPs simply mean that the max USB data rate for each
USRP is halved, or is the effect more severe?
Thanks,
Scott
<ssto...@gmail.com>
On Fri, Sep 10, 2010 at 3:19 PM, Jason Abele <ja...@ettus.com> wrote:
On Fri, Sep 10, 2010 at 12:04 PM, Scott Storck <ssto...@gmail.com> wrote:
> I have a USRP and two WBX daughterboards. Is it possible to use 4
> independent RX antennas (all tuned to the same frequency) with this
hardware
> setup?
Scott,
The WBX has only one (I/Q) receiver per daughterboard. The two
Antenna ports (TX/RX and RX2) are for convenience to enable a single
Antenna on the TX/RX in half duplex or a dedicated RX antenna on RX2.
The WBX merely switches the input of a single RX chain between those
two antenna ports based on user settings.
So, only 2 receivers are possible with your USRP + 2 WBX setup
Jason
On Fri, Sep 10, 2010 at 3:22 PM, Marcus D. Leech <mle...@ripnet.com> wrote:
I have a USRP and two WBX daughterboards. Is it possible to use 4
independent RX antennas (all tuned to the same frequency) with this hardware
setup?
Specifically, here's what I'm trying to achieve:
Antenna 0 -> Side A WBX, RX/TX port -> ADC0 -> DDC0I
Antenna 1 -> Side A WBX, RX2 port -> ADC1 -> DDC1I
Antenna 2 -> Side B WBX, RX/TX port -> ADC2 -> DDC2I
Antenna 3 -> Side B WBX, RX2 port -> ADC3 -> DDC3I
I am trying to modify gnuradio-examples/python/multi-antenna/multi_fft.py
to make this happen. I've got it running, but I can't seem to get the WBXs to
use the antennas connected to their RX2 ports.
Thanks,
Scott
<ssto...@gmail.com>
_______________________________________________Discuss-gnuradio mailing
listdiscuss-gnura...@gnu.orghttp://lists.gnu.org/mailman/listinfo/discuss-gnuradio
No, you will not be able to make that work. There are *not* two independant
Rx paths within
the WBX, only two different antenna ports, which you can switch the Rx chain
between, but there
is only 1 Rx chain.
-- Marcus LeechPrincipal InvestigatorShirleys Bay Radio Astronomy
Consortiumhttp://www.sbrac.org
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