Differences

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--- projects:hadie [2011/01/10 09:16] – [Second Flight] fsphil
+++ projects:hadie [2011/02/08 10:18] – [Third Flight] fsphil
@@ Line 57: / Line 57: @@
 The flight code for Hadie-2 is available here: http://github.com/fsphil/hadie
+===== Third Flight =====
+A third flight is planned for early-March 2011. The plan this time is:
+  * A proper PCB instead of strip-board. [Maybe]
+  * Add a 16-bit checksum to the SSDV packet structure. [Done in github, being tested]
+  * <del>Use 7-bit Reed-Solomon error correction on the telemetry strings.</del> [Better to use a mode with convolution coding]
+  * Have dl-fldigi configured to use a narrower filter width.
+  * Fixed a trivial bug that caused the baud rate to be slower than expected. [Done]
+  * Switch to a low power mode after landing.
+==== Antenna ====
+I plan to use a 1/4 wave vertical again, but made in the style of the bazooka vertical used on the first flight. The end of the coax will be stripped back 1/4 wavelength, with the outer shield folded back and split into the four radials. To help keep the antenna from flexing as the payload spins, the ends of the radials will be fixed to the payload box and a straw placed over the vertical element. Without any solder joints it should be much more reliable than my previous attempt at this style of antenna.