I did some more searching on the google machine and found: http://lists.gnu.org/archive/html/discuss-gnuradio/2012-04/msg00500.html
It's like my setup, minus the throttle and the pack K bits, with the addition of packets on either side of the modulator/demodulator. Ran the new setup, and it gives me the correct file on the output, but when I turn off "repeat" in the file source, I get no output. Why is repeat magical, and why did I have to packetize my file before sending? Shouldn't it have just sent as a stream of bits without packets? Thanks, Stephen Andrew Undergraduate, Electrical Engineering Missouri University of Science and Technology On Wed, Mar 26, 2014 at 2:44 PM, Stephen Andrew <[email protected]> wrote: > Sorry that was unclear. If I put in a file sink before the modulator, and > call that file tx, and the file on the output of the demodulator rx, tx > looks fine, but rx still looks like gunk. > > Also, if I set the original file source to not repeat, my file sinks > produce no data. Obviously, if one is sending a message, it only needs to > be sent once, not repeated. > > Thanks, > > Stephen Andrew > Undergraduate, Electrical Engineering > Missouri University of Science and Technology > > > On Wed, Mar 26, 2014 at 4:45 AM, Martin Braun <[email protected]>wrote: > >> On 03/26/2014 08:32 AM, Stephen Andrew wrote: >> > Hello, >> > >> > I'm trying to do a simple file transfer over PSK, but the text file I >> > get on the output is garbled. I've got: >> > >> > file source -> throttle -> psk(4) mod -> psk(4) demod -> pack K (8) bits >> > -> file sink >> > >> > If I put in a file sink before the modulator, I see the message just >> fine. >> >> Do you mean if you put a file sink before the modulator, you get the >> correct message in the file sink after the packer? >> >> PSK Demod is a complete demod chain, it estimates freq. offset, timing >> etc. It's probably not converging immediately, and then your signal is >> bit-shifted. >> >> M >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > >
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