From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kristoff Bonne Subject: navtex (amtor-fec/sitor-b) Date: Wed, 19 Apr 2006 10:05:44 +0200 Message-ID: <4445EF58.3040608@compaqnet.be> Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms060009040802040705000902" Return-path: Sender: linux-hams-owner@vger.kernel.org List-Id: To: linux-hams@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms060009040802040705000902 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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. 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