EPIRB decoder

[Przemekmac1]

I think portapack could be great device to decode 406MHz transmition from EPIRB (emergency transmitters like ELT's, PLB's).

https://www.sigidwiki.com/wiki/Distress_Radiobeacon_(Digital) http://jgsenlis.free.fr/406.htm https://www.youtube.com/watch?v=xLCC14b5wqU

[Brumi-2021]

Hi @Przemekmac1 , I have also studied those maritim EPIRB safety beacons . I feel very interesting Mayhem RX App , but I think that this signal will be repeated from the sea , 406 Mhz by Inmarsat satellite uploading frequency , but then, in practical use , how can we receive that original UHF signal in our Hackrf normal usage? Or you mean , decoding maritim satellite ?

[Przemekmac1]

Hi. It would be great to be able decode test signals by direct proximity of ELT, read country code, aircraft tail number and 15 HEX code.
On french web its open C-code doing it. I just compiled and it works well. I can provide some WAV files recorded from aviation ELT's.

[Przemekmac1]

Decoding by French software.

[Przemekmac1]

https://www.itu.int/dms_pubrec/itu-r/rec/m/R-REC-M.633-1-199006-S!!PDF-E.pdf

[gullradriel]

I think it would be a good addition, like a survival/emergency/disaster mode X-D Joke aside it would be interesting. @Brumi-2021 or anyone, don't you think of any other existing app that is doing part of the decoding job ? Else it means write a decoder from the scratch, even if we start with a skeleton of an existing app.

[Przemekmac1]

Its no need to write it from the scratch. I attached C code doing it. Here its next one, working on mobile platform: https://github.com/djecom1/Sarduino-TTGO-T-Beam

[Brumi-2021]

Hi @Przemekmac1 ,are you also available through discord ? I think it should be absolutely feasible to implement that app , and moreover with the reference code that you shared .

But just now I am busy with other app study . So I can not start now . Anyway if some one wants to start about it , please go ahead and I will also try to cooperate.

Anyway , I am convinced that its usage will be appreciated only in lab only , because I feel very very very low probability to decode a real live signal from UHF . But it is more a challenge ...

Cheers

[Przemekmac1]

Hi. I haven't discord but perhaps I can get it. I have whattsup, messanger etc. Regarding usage - I'm interested in this as it could help me with every-day life. I'm often testing those beacons and it would be good to be able also easily decode message (without using 406MHz radio and laptop as I do now). On other hand there are softwares as EPIRB plotter for Windows so perhaps someone use it also to receive radio singnals.

I'm not a good programist but for sure I can help by providing some subject-orientated knowledge, sample .wav files with real beacon transmissions and also bench testing of application. I have access to Portapack and aviation ELT's.

[Brumi-2021]

Join to discord Mayhem channel , just clicking the "chat" green icon in the main readme page , and contact me . Cheers

[Przemekmac1]

Ok, I think I managed this.