Hi all, I still have problems receiving any data packets from my MICA2 Mote at ISM band 433 MHz. I have tuned the usrp to the right frequency and designed the channel filters and uspr_fft_py shows me nice results. On the other side I changed the gmsk_test.py file in gnuradio-examples to my needs (manchester encoding/decoding) and the test worked fine, i.e. Test packets were manchester encoded, then modulated, I add some noise , demodulating, manchester decoding, at the end everything was written into a file. Everything was ok. When I try to combine the usrp_source with its filters to the demod chain of the manchester_test file(changed gmsk_test.py) there is nothing at the output. I've tried to change some parameters, e.g. the Threshold of gmsk2_demod_pkt, etc., but without getting any result. The format of data packet sent by the MICA2 is the following (MAC):
3 bytes preamble 1 byte sync 5 bytes header 29 bytes payload 2 bytes CRC16 the preamble and sync bytes are the access_code of gmsk2 (8 bytes in PHY layer after manchester encoding - 0x6666666666669999). I changed also the gr_packet_sink block to return a constant packet length. I don't know what to try out now and hope that someone who has done something similar can give me some tips or advises. I am very grateful for all kind of help, Luis _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
