H i Vicfield! another info for you: are you palying with a "real" EPIRB signal or with a "test" signal?
In the first case.... be sure that the signal cannot reach the open space: the signal "trigs" an expensive and complicated stuff, actulally it's starts a S&R process with a lot of people involved... In the second case, if I recall right, the signal it's sent at full power but "reversed". I dont recall if bit-order reversed or bit-complemented, sorry! In this manner it's possible to do tests ( and this is part of my job ;-) ) on EPIRB. For this I had a Futronic GMDSS testset. Hope that this ca help you... Ciao, Victor Il 24 apr 2017 18:07, "Vicfield Medici" <tet...@hotmail.com.tw> ha scritto: > Hi, > > Really thank you all. > I was read the specification of EPIRB and researched something about that, > but it’s seems some error about that. I will attach the GRC what I tried. > > > > So, a PSK that can only take values of +1.1 and -1.1, relative to the > > "idle" carrier. Bit rate is 400b/s, so that makes it a 800 S/s PSK > > symbol rate (Manchester-encoding happening in between). > > Marcus, thanks for your advice. > I set the baud rate for 400 bits/sec., > but does it related about the PLL or Time Synchronization? > I thought the Manchester decode is the part of line code > and I should take that later? > > > > About frequencies pay attention that there are more than a single > (406.025 > > MHz) > > frequency. > > In my direct experience there's also 406.028 / 406.039 MHZ in use. So > also > > tuning > > has to be on the right frequency. > > > Current NTIA spectrum documents are here: > > https://www.ntia.doc.gov/page/federal-government-spectrum-us > e-reports-225mhz-6ghz > > Thanks a lot, Vitt and Ron. > In fact, I just testing the file was recoded with my PC, > so I guess it’s not a trouble now, but still thanks. > > > Here is the GRC I tested below, it refer the GRC from here > <http://gnuradio.4.n7.nabble.com/Tutorial-on-BPSK-bursts-td58484.html> > by > Andy Walls. > > Again, Thanks and appreciated for any help. > > Thanks, > Vicfield. > > 512K_test_.grc <http://gnuradio.4.n7.nabble.com/file/n63620/512K_test_.grc > > > > BTW, how can I upload the file like "Download Attachment"? > > > > -- > View this message in context: http://gnuradio.4.n7.nabble.co > m/The-PLL-for-the-burst-signal-tp63604p63620.html > Sent from the GnuRadio mailing list archive at Nabble.com. > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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