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
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…
----- Original Message -----
From: Scott S.
To: Jason A.
Cc: [email protected]
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
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?
On Fri, Sep 10, 2010 at 3:19 PM, Jason A. [email protected] wrote:
On Fri, Sep 10, 2010 at 12:04 PM, Scott S. <[email protected]>
> I have a USRP and two WBX daughterboards. Is it possible to use 4
> independent RX antennas (all tuned to the same frequency) with
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
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
On Fri, Sep 10, 2010 at 3:22 PM, Marcus D. Leech [email protected]
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
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.
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 L.Principal InvestigatorShirleys Bay Radio Astronomy
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