Language:
EspaƱol
Power supply
Batteries
Graphs
Comparative
Subjects:
Flight 2(bis)
Flight 3(bis)
Flight 4
Theory
Other 'ballooners'
This fourth experiment is, mainly because of lack of time, a combination of old and new hardware. The beacon transmitter has shown to be reliable and was applied again. The transmitter antenna is the same with small modifications.
Larger differences are: instead of a 35 mm-camera, this payload uses a webcam, and transmits the images in SSTV (Slow Scan Television). This should have been the next step after a test in the Globo 3 experiment, but the test image generator on that flight failed. This payload will have an experimental receiver in the aeronautical bands, and will try to establish measurements using VOR signals of different airports.
Here's an index to the different areas of development. Parts were developed at the university by students of mine, as indicated in each module.
| Power | Batteries | Comparing the cells on the market, and having a few surprised while doin' it |
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Switching power supply | The battery voltage will be transformed into standard +5V bus using a switching regulator |
| Beacon | Transmitter | The small (150 mW) beacon transmitter |
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Antenna | Omnidirectional antennas do have a few secrets left |
| VOR Navigation | VOR navigation |
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Simulation | Simulating the received VOR signal to test the circuits and a few mp3 files with test signals. |
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Receiver | Step-by-step contruction history |
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Antenna | Lightweight horizontally polarized omnidirectional antennae are a project onto themselves. |
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Airports | Listing of Argentinian airports and their nav aids |
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Controller |
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| Sensors | Sensors |
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Controller |
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Links |
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| Electronic compass | Compass | A last minute addition to the project: a 3D fluxgate magnetometer. |
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Principle | How does it work (incomplete) |
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Cores tested | Results from a few core materials tested |
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More materials a configurations | More materials tested, and several test with silicon steel. |
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Circuit | The final configuration selected, and the controller |
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Results | Measurements, and calibration data |
| Camera | Camera and circuits | Camera, associated circuits, and experiences |
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weeCam | Experiences with cheap parallel webcams - Alaris weeCam. |
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Generating audio | How to generate precision audio with a low-cost microcontroller |
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Information on SSTV | Norms, comparisons, and other info on Slow Scan Television. |
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Controller |
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| (c) John Coppens ON6JC/LW3HAZ |