On 10/06/2010 11:41 AM, sirjanselot wrote: > I meant TXA to RXB. > > sirjanselot wrote: > >> Thank you for your response. >> >> I've tried gr sounder but from the looks of it, it is only accurate when >> you use the LFRX/TX or the RFX boards. >> >> I have a WBX transciever and when I tried it on my first shot measuring >> the channel coefficients by directly connecting the output of my TXA to my >> RXA, the length of the channel was 32760 coefficients!!!! >> When you say "directly', you mean through a minimum 30dB attenuator, correct? The output power of the transmitter can easily damage the LNA in the receiver if directly connected, and at the very least, will cause serious clipping.
>> I haven't been able to figure out how to read the output.dat of the >> gr-sounder yet but this is what is showing me on debugging mode. >> >> It also keeps giving me this warning message: gr_buffer::allocate_buffer: >> warning: tried to allocate >> 4 items of size 32760. Due to alignment requirements >> 512 were allocated. If this isn't OK, consider padding >> your structure to a power-of-two bytes. >> On this platform, our allocation granularity is 4096 bytes. >> >> Any thoughts? >> >> Thank you. >> >> >> Martin Braun-4 wrote: >> >>> On Tue, Oct 05, 2010 at 11:43:53AM -0700, sirjanselot wrote: >>> >>>> Hello, >>>> >>>> I'm trying to figure out how to measure the impulse response of a >>>> channel >>>> its coefficients. >>>> >>> Hello sirjanselot, >>> >>> the channel sounder which is part of GNU Radio works, but has no >>> synchronisation or anything--so you have no direct means of averaging >>> taps. Perhaps you can give it a bash, though. >>> >>> Cheers, >>> MB >>> >>> -- >>> Karlsruhe Institute of Technology (KIT) >>> Communications Engineering Lab (CEL) >>> >>> Dipl.-Ing. Martin Braun >>> Research Associate >>> >>> Kaiserstraße 12 >>> Building 05.01 >>> 76131 Karlsruhe >>> >>> Phone: +49 721 608-3790 >>> Fax: +49 721 608-6071 >>> www.cel.kit.edu >>> >>> KIT -- University of the State of Baden-Württemberg and >>> National Laboratory of the Helmholtz Association >>> >>> >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> [email protected] >>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >>> >>> >> >> > -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
