projects:hadie
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projects:hadie [2011/01/10 09:33] – fsphil | projects:hadie [2011/06/14 09:00] – fsphil | ||
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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 ==== | ||
+ | |||
+ | The payload stopped descending at a surprisingly high 361 metres. It had landed in a forest on a mountain, 11 metres up a tree. The first attempt to recover it failed, but we'll be returning soon to have another go. |
projects/hadie.txt · Last modified: 2011/07/10 18:54 by fsphil