projects:hadie
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
projects:hadie [2011/01/10 09:33] – fsphil | projects:hadie [2011/07/10 18:54] (current) – fsphil | ||
---|---|---|---|
Line 58: | Line 58: | ||
The flight code for Hadie-2 is available here: http:// | The flight code for Hadie-2 is available here: http:// | ||
===== Third Flight ===== | ===== Third Flight ===== | ||
- | A third flight | + | The third flight |
+ | |||
+ | * A much better 1/4 wave vertical antenna, made with just coax and no solder joints. | ||
+ | * Add a 16-bit checksum to the SSDV packet structure. | ||
+ | * Fixed a trivial bug that caused the baud rate to be slower than expected. | ||
+ | |||
+ | ==== Antenna ==== | ||
+ | |||
+ | After the massive failure of the antenna in hadie:2 I decided to make this one without any solder joints at all. Only RG58 coax was used, with the outer insulator stripped back just over 1/4 wavelength long and the shield carefully untwisted and split into the four radials. I left the inner conductor and insulator as is, just placing a straw over them to keep it from flexing during flight. The radials where taped to the bottom of the box with gaffer tape, and an SMA socket crimped onto the other end of the coax. | ||
+ | |||
+ | The improvement over the last flight was dramatic, with reception of telemetry and image data from over 500km away! The small mag-mount on the car was more than enough to receive telemetry during the chase, only weakening when we drove underneath the payload to get ahead of it. We didn't need to use the yagi at all this time. | ||
+ | |||
+ | ==== Landing ==== | ||
+ | |||
+ | We managed to receive telemetry all the way to the ground and after landing. It stopped descending at a surprisingly high 361 metres, which turned out to be because it landed 12 metres up a tree in a small forest on a mountain. The first two attempts to recover it failed, finally managing to cut it down on the third go. We used a 10m pole with a hook knife on the end to cut each of the four cords holding the payload up. | ||
+ | |||
+ | ==== Images ==== | ||
+ | |||
+ | All images including the live SSDV images can be seen here: http:// |
projects/hadie.1294652008.txt.gz · Last modified: 2011/01/10 09:33 by fsphil