Hi Jeff, Thank you for your quick response. I didn't do anything with the clock sync since I don't have gpsdo embedded on the N210 or any sync devices. I just used the normal setting for usrp_source and usrp_sink. I set up the antenna for tx gain to 35 and rx_gain to 15. I assume the clock sync is the problem. And for the sample rate, I used 2 Msps. For the flowgraph, I used file source block for the data I want to transmit and source sink block to receive the data. If the the sink nodes could receive the packets, I could see and read the file from the source node. My program is in no GUI mode, so I can only read the file. If the sink can receive the packets, I can read the file without any errors. But sometimes it cannot receive any packets. I am not sure. Perhaps it can receive the signal but cannot decode the packets.
Thanks again for your feedbacks. Kirianto On 25 January 2018 at 11:51, Jeff Long <willco...@gmail.com> wrote: > How are the clocks in the N210s synced? What rates are you using? What > symptoms are you seeing that tell you the sinks are not receiving packets? > > On Thu, Jan 25, 2018 at 5:34 AM, Kurniawan Dwi Irianto < > kdwiiria...@gmail.com> wrote: > >> Hallo guys, >> >> I have a configuration using gnuradio-companion as follows; >> >> ######### ######### ######### >> # sink_1 # <- - - - - # source #- - - - - --># sink_0 # >> ######### ######### ######### >> >> The devices I am using are USRP N210s and it is with SBX daughterboard >> and without GPSDO. The distance between the nodes is 1 meter. I use BPSK >> Modulation to transmit the packets and the frequency is 2.485 GHz. I would >> like to broadcast packets from source to sink_0 and sink_1. One of the sink >> can receive the packet but the other one hardly can. In 10 times run of the >> program, both of the sink can successfully receive the packets only 1 or 2 >> times. Most of the run, only one sink can receive the packets. Moreover, If >> I disable one of the sink and run of the program to transmit the packet >> from source to sink. In the 10 times run, the sink can receive it only 5 or >> 6 times. There are 4 times it fail to receive the packets. I have known yet >> where is the problem. Any suggestion would be helpful. >> >> Thank you in advance. >> >> Best regard, >> Kirianto >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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