Hi Marcus, Thanks. The daughter boards I am using are WBXs.
I can understand how to use multiply-const block to change the amplitude of the received signal, but what does the first method mean? Does it mean to set the parameter in help message "- - gain arg gain for the RF chain" or on hardware level? I did not see any button on motherboard or daughterboard for adjusting RF gain. Regards, Jamie On Tue, May 22, 2012 at 11:27 PM, <mle...@ripnet.com> wrote: > ** > > You don't say what daughtercards you're using --many of them allow you to > set the RF (analog) gain on the card. > > YOu can also modify the magnitudes of the signals using a multiply-const > block in Gnu Radio. > > > > -Marcus > > > > On Tue, 22 May 2012 23:23:49 +1000, Jamie Wo wrote: > > Thanks for your reply. > > I understand the received signals on two USRPs are not likely to be > exactly the same. I wonder is there a way to adjust either USRP or modify > software setting in gnuradio to make the amplitude close? > > Actually, what I got from two USRPN210s has a big difference in amplitude, > as shown in the attachment. How can I handle this? > > Regards, > > Jamie > > On Tue, May 22, 2012 at 10:56 PM, <mle...@ripnet.com> wrote: > >> On Tue, 22 May 2012 22:40:11 +1000, Jamie Wo wrote: >> >> Hi all, >> I met a werid problem when receiving. When I ran 'rx_samples_to_file' >> example to receive signal from a signal source, e.g. radio station, on two >> USRPN210s, the amplitude of received signals are different, seen from >> gnuplot. >> Does anyone know why this happenes? I guess this is the problem of USRP, >> because I ran the same program, set the same parameters for >> 'rx_samples_to_file', receive the same signal source and the two USRP N210s >> were placed next to each other on the table. >> Is there a way to set USRP/daughterboard so that the received signals >> have the same amplitude on two USRPs or adjust other parameters in >> gnuradio/uhd to do that？ >> Regards, >> Jamie >> >> Analog electronics can have variability in gain response, perhaps as >> much as 2dB for nominally-identical daughter-cards, and identical gain >> settings. >> >> Furthermore, propagation can often lead to variations in signal strength >> between two identical receivers, with identical antennae even in the same >> physical area, especially in the presence of multi-path signal propagation. >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > >
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