Re: [Discuss-gnuradio] The PLL for the burst signal

[Vitt Benv]

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" <address@hidden> 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-use-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"?



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