The Ilmari Project is not a Viestikallio Project, this just happened to be a place where we could host these web-pages...
Amateur Radio systems on different balloons
The Ilmari 2003 Balloon - Tracking Stations
Things to track:
- APRS position reports
- HF-beacon CW/MFSK16 data
- Translator BPSK and CW/MFSK16 beacons
- Nowcast/forecast of flight direction, landing location, and coverage areas
Ways to track:
- APRS receivers in moving cars
- People listening on CW beacon data (~25 WPM) (in moving cars)
- At fixed stations receiving interesting frequencies in USB/NBFM mode with multiple radios, and storing received audio signals to a "everyman long-duration audio recorder", namely a HiFi-Video VCR. A 4 hour tape can store 8 hours of audio in two wide (20 kHz or so) channels, when running at half-speed. Sometimes mono-audio is third separate option.
- Receiving entire translator output bandwidth at IF level sampling 16 bits at about 70-150 kHz. One possibility would be to record into different channels different parts of the pass-band. (About gigabyte per hour.)
- Receivers as above, processing it in real-time using PC machine's prevalent audio hardware capabilities. Recording received data.
- At fixed stations with a wide-band network connectivity a real-time data-stream feed to central correlation system, which will then produce publishable "sensor fusion" presentation.
Input stream is unprocessed SSB USB audio at 9600 samples/sec, at 16 bits/sample. Either sending that datastream to external processing in UNCOMPRESSED form, or processing it locally, and sending resulting data.
- Combinations of the preceding cases.
Ways to present:
In web (for people without radios/technology) easily readable near real-time (10-120 sec) presentations of:
Raw data files
Decoded presentation for individual packets
Time-series plots of all datas
Of the flight, and forecasted landing location.
Recommended transmitter+antenna ERP power
Post-flight individual charts will be rendered into DivX movies.