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 <[email protected]> On Fri, Sep 10, 2010 at 3:19 PM, Jason Abele <[email protected]> wrote: > On Fri, Sep 10, 2010 at 12:04 PM, Scott Storck <[email protected]> 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 <[email protected]> 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 <[email protected]> _______________________________________________ Discuss-gnuradio mailing list [email protected] http://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 Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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