Re: [Discuss-gnuradio] USRP2 transmit to USRP1 issue
I met similar problem about the USRP2 transmitting. When I record the received signal I found the signal that USRP2 transmitted out is not continuous. Some signal segements are lost. This problem is independent with the data rate. And this problem appears in some DELL computers but doesn't appear in one IBM computer. I guess the ethernet chipset may be the reason. But I didn't check this until now. You may, 1. Record the signal then check what happens 2. Try another computer BR Lin 2010/3/27 Phillip Walsh > The question: Has anyone gotten benchmark_tx.py (or tunnel.py) to work from > USRP2 to USRP1? > > I have built a fairly in-depth CSMA/CA MAC on top of the simple carrier > sensing in 'tunnel.py' to test the performance in some protocol variations. > My setup works great with the USRP1s which I designed on. The problem is we > ordered a USRP2 in edition to the 3 USRP1's we have and I've had no luck > getting it to work with the rest. I am using RFX2400 d'boards. > > The problem is packets sent by USRP2 are either not received at all by the > USRP1 or occasionally received but with bit errors. The USRP2 IS able to > receive USRP1 packets using DBPSK at 100Kbps successfully. I have tried > different rates making sure both give the same actual bitrate using the > verbose option. I set tx-amplitude=0.05. > > I am using the 3.2.2 release, but have also tried the benchmark_tx/rx2.py > using 'dbpsk2' in the developers branch with no luck. > > Thanks for any input, > > Phil Walsh > Auburn University > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] USRP2 transmit to USRP1 issue
On Fri, Mar 26, 2010 at 7:38 PM, Phillip Walsh wrote: > The question: Has anyone gotten benchmark_tx.py (or tunnel.py) to work from > USRP2 to USRP1? > > I have built a fairly in-depth CSMA/CA MAC on top of the simple carrier > sensing in 'tunnel.py' to test the performance in some protocol variations. > My setup works great with the USRP1s which I designed on. The problem is we > ordered a USRP2 in edition to the 3 USRP1's we have and I've had no luck > getting it to work with the rest. I am using RFX2400 d'boards. > > The problem is packets sent by USRP2 are either not received at all by the > USRP1 or occasionally received but with bit errors. The USRP2 IS able to > receive USRP1 packets using DBPSK at 100Kbps successfully. I have tried > different rates making sure both give the same actual bitrate using the > verbose option. I set tx-amplitude=0.05. > > I am using the 3.2.2 release, but have also tried the benchmark_tx/rx2.py > using 'dbpsk2' in the developers branch with no luck. > > Thanks for any input, > > Phil Walsh > Auburn University Yes, I developed the v2 of the digital stuff by testing them out communicating between a USRP1 and USRP2 (both ways). Try increasing the amplitude. Is this over-the-air or through a cable connection? You can start with a cable (and a low tx-amplitude, < 0.2) to get a feel for the received power you are seeing. But in general, it should work, especially with the new dbpsk2/dqpsk2 since they have arbitrary bit rates and you don't have to worry about matching them between the devices. Tom ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] USRP2 transmit to USRP1 issue
The question: Has anyone gotten benchmark_tx.py (or tunnel.py) to work from USRP2 to USRP1? I have built a fairly in-depth CSMA/CA MAC on top of the simple carrier sensing in 'tunnel.py' to test the performance in some protocol variations. My setup works great with the USRP1s which I designed on. The problem is we ordered a USRP2 in edition to the 3 USRP1's we have and I've had no luck getting it to work with the rest. I am using RFX2400 d'boards. The problem is packets sent by USRP2 are either not received at all by the USRP1 or occasionally received but with bit errors. The USRP2 IS able to receive USRP1 packets using DBPSK at 100Kbps successfully. I have tried different rates making sure both give the same actual bitrate using the verbose option. I set tx-amplitude=0.05. I am using the 3.2.2 release, but have also tried the benchmark_tx/rx2.py using 'dbpsk2' in the developers branch with no luck. Thanks for any input, Phil Walsh Auburn University ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio