navtex (amtor-fec/sitor-b)

navtex (amtor-fec/sitor-b)

[Kristoff Bonne]

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Gegroet,


I don't know if this the correct mailing-list for this, but I have been 
trying to decode the broadcasts from the local navtex-station here in 
Ostend.

(navtex is a maritime service broadcasting safety-related information on 
490 or 518 Khz, 100 baud/170 Hz FSK; see 
http://home.cogeco.ca/~dxinfo/navtex.htm)

I seems to have two options:
-> "hfterm", which *sometimes* works with quite a lot of errors in it 
and has a lot of problems syncronising to the datastream.
(althou the radio-signal is very good))

Note that I have the same problems using the native soundcard of my 
laptop (compaq evo N610c) and using a Griffin iMic (which I use on my mac).
I also have very bad performance when using hfterm on rtty (like the 
service from the Deutsche Wetterdienst at 147.3 Khz); so it might be 
related to my system or to hfterm itself.


Does anybody have any hints on getting "hfterm" to work correctly? (my 
receiver -a sony 7600- only goes as log as 150 Khz, so I cannot use the 
"DCF77"-syncronisation test).


-> A second option is to hack the sitor-B/amtor-fec protocol into 
another program.

My choice would be gmfsk as it already has a very good GUI 
(waterfall-display, AFC); and it works very good for other protocols 
(like RTTY). This means it already has the code for FSK-demodulation in it.

It would be nice if there would a way to "hook" code for other protocols 
after the demodulation-process (be it FSK, MF, xPSK, ...) and use gmfsk 
as "frontend" and write additional protocols or applications on top of 
it. (in fact, designing a kind of general "toolkit" of code for 
digital-mode programs).


Does anybody know if there is a specialised mailing-list on gmfsk or on 
coding digital-mode related ham-programs?

Or is this mailing-list also usable for this?



Cheerio! Kr. Bonne.

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