Hi Surya, > I use access code from packet decoder
That sounds like a good approach; you should have told us earlier! > Problem is when I start the Rx's fg the file sink immediately write file output even Tx's fg not run. this means that the access code checking doesn't work. Best regards, Marcus On 06/11/2015 11:00 AM, Surya Agam wrote: > I want to transmitted digital file (i.e. .jpg) with file source on Tx > side then received the file with file sink. > It's not about "silence or noise" because I use access code from > packet decoder, the problem is when I start the Rx's fg the file sink > immediately write file output even Tx's fg not run. Or when I start > the Tx's fg first, the file transmitted (repeat = off) but the Rx's fg > not start yet. I doubt these situation will compromised the output file. > > I haven't test it yet, still working to "remove" the noise from > transmission. > > On Thu, Jun 11, 2015 at 5:15 AM, Chris Kuethe <[email protected] > <mailto:[email protected]>> wrote: > > Examples of the squelch block include > http://www.ece.uvic.ca/~elec350/grc_doc/ar01s01s03.html > <http://www.ece.uvic.ca/%7Eelec350/grc_doc/ar01s01s03.html> and > http://files.ettus.com/tutorials/labs/Lab_1-5.pdf > > I've never used timed events in gnuradio, I just know that you can do > things in a time-aligned way. You may want to google for "gnuradio > squelch" and "gnuradio timed" > > Out of curiousity, why do you need to handshake? What's wrong with a > little bit of silence or noise at the beginning and end of your > recording? > > On Wed, Jun 10, 2015 at 3:02 PM, Surya Agam > <[email protected] <mailto:[email protected]>> wrote: > > Would you mind to tell me how? > > I have no idea. > > > > On Thu, Jun 11, 2015 at 4:54 AM, Chris Kuethe > <[email protected] <mailto:[email protected]>> > > wrote: > >> > >> Maybe use a squelch block and wait for for received power to exceed > >> some critical level? Or use timed events? > >> > >> On Wed, Jun 10, 2015 at 1:47 PM, Surya Agam > <[email protected] <mailto:[email protected]>> > >> wrote: > >> > Hello everyone, > >> > > >> > I try to transmitting a file using PSK modulation with 2 x > USRP B200 as > >> > Tx > >> > and Rx. When I run the Tx's fg, the Tx only transmitted > before the Rx fg > >> > completely run. But when I run the Rx's fg, the file sink > already write > >> > something before I run the Tx's fg. Is there any way to both > Tx and Rx > >> > "handshake" before transmission started? > >> > > >> > -- > >> > Sincerely, > >> > > >> > Surya Agam > >> > University Al Azhar of Indonesia, Jakarta > >> > > >> > _______________________________________________ > >> > Discuss-gnuradio mailing list > >> > [email protected] <mailto:[email protected]> > >> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >> > > >> > >> > >> > >> -- > >> GDB has a 'break' feature; why doesn't it have 'fix' too? > > > > > > > > > > -- > > Sincerely, > > > > Surya Agam > > University Al Azhar of Indonesia, Jakarta > > > > -- > GDB has a 'break' feature; why doesn't it have 'fix' too? > > > > > -- > Sincerely, > > Surya Agam > University Al Azhar of Indonesia, Jakarta > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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