Before purchasing, check the dongle is compatible with the software you intend to use! *Not all dongles are compatible with SDR# and CubicSDR.
This set-up is based on the RTL-SDR dongle kits (£35), which come with a dongle, adapter, extension cable as well as a portable dipole antenna. Ideally, the USB cable should be no longer than 3 metres to avoid interference.
Other software and hardware setups are possible! Importantly, the guide is limited to Windows and MacOS. We document here only a few ways to receive an Automatic Picture Transmission (APT) from active National Oceanic and Atmospheric Administration (NOAA) satellites. If you use the guide, please send and feedback: what worked, what was missing or could have been clearer? Guide for the reception of NOAA satellite images using software defined radio on Windows or MacOS Wxtoimg -t n -e HVC -N satnogs/satnogs_1193773_T07-13-50.wav > satnogs/satnogs_1193773_T07-13-50.This guide is a Beta version and is currently being tested! Testing may take longer than planned as due to supply chain issues caused by the Covid-19 pandemic some hardware components might be temporarily unavailable. Then invoke command line interface of WXtoIMG with:.
Download for example the ogg file from observation #1193773 and convert it to wav with:.wav file and produces weather picture with possible nice overlays (frontiers, colors.). However, if you want to add overlays or test some part of the processing, you can do it manually. SatNOGS client produces automatically such weather map. WXtoImg is a program used to produce neat weather pictures from APT format receptions of NOAA satellites. Press the play button and you will be asked to select the previously generated wav file.Sox file.ogg -esigned-integer -b 16 -r 48000 file.rawĭirewolf -B 1200 -b 16 -n 1 -r 48000 -q hd -t 0 -q h -q d -d p -d t -a 0 - Sound Input: from file" It can take raw files and decode APRS.įirst you have to use sox to convert ogg files from SatNOGS download to 22050Hz raw file You can add more decoders if needed with additionnal "-a" optionsĭirewolf is a software encoder/decoder for APRS (AX.25). Then use multimon-ng with AFSK1200 decoder Sox -t ogg $file -r 22050 -t raw file.raw $soxopts
Then you must apply on the raw file the proper decoder:įirst convert to raw sound file (sampling frequency 22050Hz) using sox You have to adjust gain to get proper decoding. The gain is in dB and has a considerable impact on the decoding It can take wav or raw files and decodeĪ variety of modes among which: CW, AFSK, FSK.įirst you have to use sox to convert ogg files from SatNOGS download to 22050Hz raw file: Multimon-ng is a general purpose decoder.