projects:hadie
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
projects:hadie [2010/11/15 14:52] – [Second Flight] fsphil | projects:hadie [2011/01/11 21:45] – [Third Flight] fsphil | ||
---|---|---|---|
Line 39: | Line 39: | ||
Images from the main and uart cameras can be seen here: http:// | Images from the main and uart cameras can be seen here: http:// | ||
===== Second Flight ===== | ===== Second Flight ===== | ||
- | A second flight | + | A second flight |
* Interrupt driven RTTY code with a single pin and two resistors. (3.3v -> 330 ohm -> NTX2 tx pin <- 2.2k ohm <- rtty output pin) | * Interrupt driven RTTY code with a single pin and two resistors. (3.3v -> 330 ohm -> NTX2 tx pin <- 2.2k ohm <- rtty output pin) | ||
* The new robust image format, a lost packet will not ruin the rest of the image. See the [[guides: | * The new robust image format, a lost packet will not ruin the rest of the image. See the [[guides: | ||
- | * A network of distributed listeners should hopefully reduce the chances of a lost packet. | ||
* Quarter-wave dipole antenna, mounted so that the module doesn' | * Quarter-wave dipole antenna, mounted so that the module doesn' | ||
* Canon A560 camera with CHDK and script to take regular images. | * Canon A560 camera with CHDK and script to take regular images. | ||
+ | * A new version of the C328 UART camera with a wide-angle lens. | ||
+ | * A thicker polystyrene box with compartments for each of the components, wrapped in foil backed polystyrene sheets. | ||
+ | |||
+ | The balloon was released at 12:17 UTC and began heading east almost immediately. Reception on the small vertical became difficult within about five minutes of release, so we switched to using the stacked yagi array. Even with this the signal was fading fast and the last string to be fully decoded was at 13:09 UTC. There was enough time to receive three full images and fragments of a few more. Contact was re-established by G4FVP and M0DTS at 14:58, almost two hours later! By now the payload was descending and had stopped sending images. The last known position, taken from incomplete telemetry by G4FVP was at 54.383, -2.03966 from about 1300 metres up. The predicted landing spot was 54.3629, -1.88296: | ||
+ | |||
+ | {{: | ||
+ | |||
+ | M0DTS/Rob went to the area but no signal was received. The payload may have been damaged on landing or the hills could have blocking the already weakened signal. I don't know yet what happened to make the signal so weak, but there' | ||
+ | |||
+ | The highest altitude was received by M0DTS from incomplete telemetry, and was 30217 metres at 14:36:09. M0DTS also reported a likely burst at ~14:51 and with a 3.5m/s ascent rate puts the burst altitude at roughly 33.3km. | ||
The flight code for Hadie-2 is available here: http:// | The flight code for Hadie-2 is available here: http:// | ||
+ | ===== Third Flight ===== | ||
+ | A third flight is planned for mid-March 2011. The plan this time is: | ||
+ | |||
+ | * Go back to using the Vertical Bazooka antenna as used on the first flight! Need to find some way to keep it straight as the payload spins around. | ||
+ | * A proper PCB instead of strip-board. | ||
+ | * Add a 16-bit checksum to the SSDV packet structure. | ||
+ | * Use Reed-Solomon error correction on the telemetry strings. | ||
+ | * Have dl-fldigi configured to use a narrower filter width. | ||
- | Despite | + | Apart from the antenna problems everything went extremely well for Hadie' |
projects/hadie.txt · Last modified: 2011/07/10 18:54 by fsphil