On Mon, Jan 30, 2012 at 04:11:05PM +0100, Florian Schlembach wrote: > We have now extended our tests to the tests with two USRP2s with > daughterboards: Neither the benchmark_tx.py example nor the tunnel.py is > receiving any packets. We checked the spectrum and tuned the gains as well. > (OFDM) > > Now, we played with the benchmark files and tunnel.py located in the > narrowband > folder and therefore changed the modulation scheme from BPSK to GMSK and > ultimately receiving all the packets!! That's strange. > > Does anybody knows what code be the problem that we can't establish any > connection using higher order modulation schemes? Could it possibly be our > slightly outdated UHD version? > > We are totally clueless, so we appreciate any idea/help!
This won't really help, but I remember we had exactly the same troubles here. This was before UHD was even released, so I doubt that's the reason. Unfortunately, I can't remember how (or: if) we fixed it :( but I'll keep you updated if my memory comes up with something. But fiddling with gain values is often useful; even if you've already done that I recommend trying again, by reducing tx-amplitude and the actual gain values, shifting the terminals around (perhaps they're too close?). MB -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
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