Here's the RAW data...
Below is the raw data from Vlads excursion into the upper stratosphere. The first paragraph is the data chunk from 9/26/2010 at 11:53:43UTC (a good data point for reference). Second paragraph is the offending data chunk from 9/26/2010 at 11:56:15UTC (the high altitude data chunk).
The first part of the paragraph is the decoded info, the second part is the HEX code that is sent out from your APRS transmitter and recieved by an iGate.
The HEX code highlighted in
BLUE is the altitude portion of the data chunk. Pulling those two HEX codes out and comparing them is interesting...
303030303439 ...good
313835343130 ...bad
Remove the "3" (In HEX code, all digits begin with a 3) and you get...
000049 ...good
185410 ...bad
After picking all this apart, I have no idea where the altitude got garbled.
The rest of the data chunk was transmitted correctly, just the altitude was off by a couple of feet.
2010-09-26 11:53:43 UTC KC2TPD-1: 103 bytes
K C 2 T P D - 1 > A P B L 1 0 , K 2 M A K , W I D E 1 * , W I D E 2 - 1 , q A R , N 2 M H - 1 2 : ! 4 0 4 2 . 1 1 N / 0 7 4 0 0 5 8 W > 2 4 8 / 0 3 9 / A = 0 0 0 0 4 9 V l a d ' s M I N I C o o p e r
4b43325450442d313e4150424c31302c4b324d414b2c57494445312a2c574944 45322d312c7141522c4e324d482d31323a21343034322e31314e2f3037343030 2e3538573e3234382f3033392f413d
303030303439566c61642773204d494e49 20436f6f706572
2010-09-26 11:56:15 UTC KC2TPD-1: 103 bytes
0x00 K C 2 T P D - 1 > A P B L 1 0 , K 2 M A K , W I D E 1 * , W I D E 2 - 1 , q A R , N 2 M H - 1 2 : ! 4 0 4 2 . 7 8 N / 0 7 4 0 0 9 5 W > 0 2 8 / 0 1 0 / A = 1 8 5 4 1 0 V l a d ' s M I N I C o o p e r
4b43325450442d313e4150424c31302c4b324d414b2c57494445312a2c574944 45322d312c7141522c4e324d482d31323a21343034322e37384e2f3037343030 2e3935573e3032382f3031302f413d
313835343130566c61642773204d494e49 20436f6f706572