Re: [Discuss-gnuradio] any alternative API for set_auto_tr when using xcvr2450+usrp2
On Mon, Mar 2, 2009 at 12:35 PM, Matt Ettus wrote: >> The USRP2 is *always* in auto T/R mode; that is, it does not support >> full duplex without a modification to the FPGA and firmware code. > > I'd like to clarify that statement a bit. Full duplex operation requires > modified firmware and host code. The as-released FPGA image itself has no > limitations that we know of when it comes to full duplex operation. > > The Auto-T/R issue is separate. If you want to operate full duplex, the > Auto-T/R settings need to be modified so to send RX to one port and TX to > the other port, regardless of whether you are transmitting or not. Sorry I was unclear--thanks for the clarification. Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] any alternative API for set_auto_tr when using xcvr2450+usrp2
Johnathan Corgan wrote: On Thu, Feb 26, 2009 at 9:14 PM, Xiaolong Li wrote: Can I still call set_auto_tr to enable auto switch Rx and Tx with xcvr2450+usrp2? It seems like the set_auto_tr is no longer available. Is there any alternative API for same function? Without calling set_auto_tr, USRP2+xcvr2450 can receive normally, however, no luck for transmission. Could anybody explain why this happens? Thanks. The standard firmware build has transmit on one antenna port and receive on the other. So you can either change the software to put them both on the same antenna port, or you can use 2 separate antennas. The USRP2 is *always* in auto T/R mode; that is, it does not support full duplex without a modification to the FPGA and firmware code. I'd like to clarify that statement a bit. Full duplex operation requires modified firmware and host code. The as-released FPGA image itself has no limitations that we know of when it comes to full duplex operation. The Auto-T/R issue is separate. If you want to operate full duplex, the Auto-T/R settings need to be modified so to send RX to one port and TX to the other port, regardless of whether you are transmitting or not. Also, please note that the RFX-series boards can do full duplex, but the XCVR2450 cannot transmit and receive simultaneously. The act of transmitting turns off the receiver, so no amount of software will ever change that. It is perfectly fine for TDD, TDMA, CDMA, and FDMA type systems, but it will not do FDD. Matt ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] any alternative API for set_auto_tr when using xcvr2450+usrp2
On Thu, Feb 26, 2009 at 9:14 PM, Xiaolong Li wrote: > Can I still call set_auto_tr to enable auto switch Rx and Tx with > xcvr2450+usrp2? It seems like the set_auto_tr is no longer available. Is > there any alternative API for same function? Without calling set_auto_tr, > USRP2+xcvr2450 can receive normally, however, no luck for transmission. > Could anybody explain why this happens? Thanks. The USRP2 is *always* in auto T/R mode; that is, it does not support full duplex without a modification to the FPGA and firmware code. Thus, there is no auto TR configuration in the USRP2 host code. Have you verified that it is in fact not transmitting, not just that the receiver doesn't see any packets? Regarding the XCVR2450, support in the USRP2 has undergone a lot of changes/bug fixes in the last few weeks. Can you retest with at least revision 10524 of both the FPGA and and firmware? The binaries are posted on the GNU Radio website. These will require you to have installed at least that revision of the GNU Radio trunk. Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] any alternative API for set_auto_tr when using xcvr2450+usrp2
Hello all, Can I still call set_auto_tr to enable auto switch Rx and Tx with xcvr2450+usrp2? It seems like the set_auto_tr is no longer available. Is there any alternative API for same function? Without calling set_auto_tr, USRP2+xcvr2450 can receive normally, however, no luck for transmission. Could anybody explain why this happens? Thanks. Best regards, Xiaolong___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
