Solved it: Installed an old version, GnuRadio 3.1.1, I had on disk and the rev 4.3 USRP1s seem to work fine now on that.
Is this a known/common issue? On Fri, Apr 2, 2010 at 2:44 PM, Phillip Walsh <[email protected]>wrote: > I am absolutely stumped, any help with this would again be greatly > appreciated. > > Last week I had a question trying to get USRP2 to work in my MAC testbed. > I decided not to worry about that for the time being and borrowed 2 USRP1s > from another research group to finish a project. However, I am not unable > to get benchmark_tx/rx.py or obviously tunnel.py to work with these USRPs as > I have hundreds of times before with the other USRPs. > > My first 2 USRP1 are Rev 4.5. > I have 4 RFX2400 Rev 30, tested all successfully on 4.5. > USRP1s in question are Rev 4.3. > GNU Radio 3.3.2 > > The Rev 4.3 transmits a waveform that appears on rev 4.5 FFT as a good gmsk > (tried dbpsk also) signal. I set the TX amplitude to 5000 and RX gain to > 30, but have tried many many values. The rev 4.3 will not successfully > decode the rev 4.5 signal either. > > Literally when I swap the USRPs out with the exact same set up, it works > with rev 4.5 boxes. I have tested the usrp 4.3s including FFT, siggen, etc. > and everything else seems fine other than packet decode and correct > transmitting. I also tried RFX900's between those two with no avail. > > I've tried all the parameters I could think. Do I need to use a specific > older GR revision? Special decimation, interpolation, samples/symbol, etc? > > As a side note: the simple reliable MAC I have implemented which includes > RTS/CTS (w/ threshold), ACK, multi-hop, multiframe transmit is working great > (so far). I look forward to publishing it for the community when I finish > this project. > > Regards, > > Phil Walsh > Auburn University >
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