-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Andrew,
just a quick heads-up: I nearly missed your message because it was hidden in another thread, since you seem to have hit reply and changed subject and text; however, my mail client recognized the In-Reply-To header, and sorted you in - please directly write mails unless you actually mean to reply. So now for your question > Ads-b uses a 1 MHz pulse position modulation scheme On 30.01.2014 01:22, Andrew Rich wrote: > Ads-b uses a 1 MHz pulse position modulation scheme > > Is this possible to create on gnu ? GNU Radio is only a software radio framework. Basically you can do anything with it that can be done in baseband signal of a sample rate that your ADC/DAC and mixers (and analog filters, amps and so on) support. With gr-air-modes there is a comfortable receiver implemented in GNU Radio, and as a not-to-rough simplification you can transmit everything with a software radio that you can receive with one. > > Is it the data rate that makes the spectrum wide ? 7 MHz ? Ok, I don't really understand your question, could you please elaborate? Reception of ADB-S works quite well with a 4MHz sampling bandwidth, but I'm not quite sure on the technical requirements of ADB-S transmission. The actual bandwidth of PPM systems of course depends on pulse shape and pulse frequency. Hope I was able to help a little, Marcus -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJS6f7XAAoJEAFxB7BbsDrLbjEH/2sA8pHEcp/2V0jsStvfMAgi 8oI4YqJoNrf/C3Y/2mPCzdUcqO2pCPcyFoDvs1zkT+rxtKOg3u9K9pMhNBqe6RhA tWtxcu2lBoGiu77W8XBFehimpNUe/kGyLxMsn3i0JRe7C0/wlWlVoAYiIHo7rj5T balJ0VGzLCQEo6tl1uy4ieo7Mwnz52ycTkqhTj0oByBowhMvQ9gLcjNRWTX/s81W ErkCVaWXDKLjzq77kDPxoGpo/vB1GC8Ut6rcgx8tuc7AylB0BXsJW5+HOwK3CF8A QwASOazwrNeIe0jvyKWFkpGNU1RTS8z26BbxyieA9LpyO9P0oWY0cyua1sS3z7E= =UphT -----END PGP SIGNATURE----- _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
