I can't understand your setup from the description, maybe a GRC file or source code would help. In any case, it sounds like you may have 3 USRPs tied together in one flowgraph, which could cause a problem.
On Thu, Jan 25, 2018 at 6:13 AM, Kurniawan Dwi Irianto < [email protected]> wrote: > 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 <[email protected]> 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 < >> [email protected]> 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 >>> [email protected] >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >>> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >
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