RTTY-HF-RTL-SDR - Printable Version +- OpenMarine (https://forum.openmarine.net) +-- Forum: OpenPlotter (https://forum.openmarine.net/forumdisplay.php?fid=1) +--- Forum: How I did it (https://forum.openmarine.net/forumdisplay.php?fid=6) +--- Thread: RTTY-HF-RTL-SDR (/showthread.php?tid=3076) |
RTTY-HF-RTL-SDR - xfactor99 - 2020-11-08 Hi, finaly today I got my first RTTY HF reception. Transmitting from Hamburg in Germany to Alicante in Spain Here the result: They offer weather for the Atlantik, North-Sea, Baltic and East/West Mediteranean The Programm/Times and frequencies you can find here: Prog1 https://www.dwd.de/EN/specialusers/shipping/broadcast_en/brodcast_rtty_1_052014.pdf?__blob=publicationFile&v=1 Prog2 https://www.dwd.de/EN/specialusers/shipping/broadcast_en/broadcast_rtty_2_052014.pdf?__blob=publicationFile&v=1 I used: Pi 4 OP2 RTL-SDR- wide with HF connected to my Backstay-Antenna GQRX (Installed with OP2 SDR-VHF Installer) FLDIGI installd over command line The steps were, 1: to get an FM-Radio station to play in GQRX 2: Tune in an HF-Signal like RTTY or Weatherfax in GQRX 3: Get FLDIGI to decode an Weatherfax from an audio (wav) file 4: Get the HF-Signal from GQRX into FLDIGI 5: Find the right Settings for RTTY-Mode on FLDIGI At the end it was a lot of trying and testing and I´m still not verry shure how to reproduce ... From this point it should be a short stepp to get Weatherfax decoded, also my harbour with all the Masts and Mountain is not a good palce to receive. Save sailing to all Andreas RE: RTTY-HF-RTL-SDR - Sailoog - 2020-11-09 thanks! an openplotter-hf app is in the TODO list RE: RTTY-HF-RTL-SDR - xfactor99 - 2020-11-13 (2020-11-09, 07:08 PM)Sailoog Wrote: thanks! an openplotter-hf app is in the TODO list Now I manage to capture with OP2 Navtex and Weatherfax: The main problem I found was to get the GQRX-audio-stream into the FLDIG decoding program. I don´t understand much about the PI audio settings but it seem that the OP-SDR-VHF settings are not the ones the HF situation requires. (Alsa, Pulseaudio, .asoundrc). I finaly uninstald in OP SDR-VHF with the AIS and GQRX and installed GNURADIO and GQRX over the command line. I guess a SRD-HF for OP will sort this out. Otherwise it is working nicely. The CPU ussage is low. Runnig the PI, OP with Signalk , the GQRX and FLDIGI consumes only about 40-45% of CPU and 25-30% if the windows are minimized. CPU Temperature arround 60C in about 23 C ambient temerature. So it would be no problem to run in the background .... By the way I did not get Sean Weaterfax-Plugin in OPENCPN to run, also a problem off getting the audio setup correctly. Would love to have an OP-HF-APP .... maby this is some more motivation. Thanks a lot for everybody who has contributed to this great project. Save sailing Andreas RE: RTTY-HF-RTL-SDR - BlackSea - 2020-11-13 @xfactor99 small question. Which SDR Receiver, that RTTY (147kHz) & NAVTEX(490/518kHz) , do you use? RE: RTTY-HF-RTL-SDR - xfactor99 - 2020-11-14 (2020-11-13, 11:19 PM)BlackSea Wrote: @xfactor99Hi Black Sea it is a Patrol Dx SDR wich I own fo a cupple of years so it is an early version. Here you can see: https://www.rtl-sdr.com/tag/dx-patrol/ Just google, but I think they are all Chinies 100kHz - 30 mMz wide rtl sdr (with an downconverter) . You find the them for arround 30€. The RTTY above i made on 7.646 kHz. as i think the 147kHz will not find all the way to Spain but not shure about. Save sailing Andress RE: RTTY-HF-RTL-SDR - DroZDi - 2022-11-08 DX-Patrol in deed good device but not cheap :/ For audio channeling I suggest use internal also loopback in raspberry -> https://blog.getreu.net/_downloads/snd-aloop-device.pdf Next in fl-digi in Audio tab just only pick up loopback device |