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?
On Fri, Sep 10, 2010 at 3:19 PM, Jason Abele <address@hidden>
wrote:
On Fri, Sep 10, 2010 at 12:04 PM, Scott Storck <address@hidden> 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 <address@hidden> 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.
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 Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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