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CP-4 Apr 23, 2007



Hi Keith,

thanks for the information.

I analyzed the recorded files again but the same results - no 115 bytes !
Then I analyzed the wav file from your website (CP2) - here I could decode
really 115 bytes - so I assume that my software works ok :-)

Last pass I could successfully decode 3 frames:

20:48 UTC cw header: FPFA

ctrl: 3 {UI}  PID: F0 {No L3}  Total Frame Bytes: 23
from N6CP to N6CP: 
   1 > 04 43 4F 4D 4D 20 42 
.COMM B

ctrl: 3 {UI}  PID: F0 {No L3}  Total Frame Bytes: 111
from N6CP to N6CP: 
   1 > 01 16 12 0C 26 16 8F 02 07 04 64 9D C0 90 03 00 03 71 BC C9 
  21 > C7 C1 8C 01 00 09 98 36 B9 C6 BD 91 03 02 03 7E 52 D4 C8 C4 
  41 > 8E 00 00 03 66 DB C0 00 04 B8 8E B8 B8 A4 11 0F 0B 09 03 01 
  61 > 65 75 75 B9 B9 83 C7 66 F9 6C FF 84 EC 8B C7 6B F9 FF FF E8 
  81 > EE 03 01 00 00 66 26 08 5B 01 28 2E 2E 5C D0 

-------------------------------------------------------------------
20:53 UTC cw header: FPEA

ctrl: 3 {UI}  PID: F0 {No L3}  Total Frame Bytes: 23
from N6CP to N6CP: 
   1 > 04 43 4F 4D 4D 20 41 
.COMM A


ctrl: 3 {UI}  PID: F0 {No L3}  Total Frame Bytes: 112
from N6CP to N6CP: 
   1 > 01 19 12 0C 2C 15 D2 02 07 03 5B A6 B9 C0 C1 00 01 02 7D C6 
  21 > BB B6 C1 C1 01 02 08 B0 2C AE B3 BD 83 03 03 03 8E 42 F1 E6 
  41 > C4 80 01 00 03 75 95 F6 C0 00 04 B8 A1 B8 B8 98 10 12 0C 04 
  61 > 01 73 85 85 BA BA 83 C7 60 F5 66 FE 67 EC 8B C7 6B F6 FF FF 
  81 > E7 EE 03 01 00 00 26 26 08 64 01 26 2B 2B 5C B0 

-------------------------------------------------------------------

20:58 UTC cw header: FPEA

ctrl: 3 {UI}  PID: F0 {No L3}  Total Frame Bytes: 23
from N6CP to N6CP: 
   1 > 04 43 4F 4D 4D 20 42 
.COMM B

ctrl: 3 {UI}  PID: F0 {No L3}  Total Frame Bytes: 111
from N6CP to N6CP: 
   1 > 01 1B 12 0C 30 14 B0 02 04 03 56 9E 7C C0 C5 03 00 02 85 B6 
  21 > 76 72 C2 C4 58 51 08 B0 23 5F 62 BE AE 03 01 03 93 4F F5 EA 
  41 > C5 AB 00 00 03 77 9A DF C0 00 05 B8 A2 B8 B9 BE 10 0E 0B 03 
  61 > 01 78 89 88 B9 BA 8B C7 6A F3 FC FF 6E EC 8B C7 6B F4 FE FF 
  81 > E6 EE 03 01 00 00 66 26 08 5B 01 28 29 2B C0 

Here you can see the same - never 115 bytes! I hope, this will help you ....

If you are interested in the wav file, let me know. I will send it to you.

73, Mike
DK3WN




-----Ursprüngliche Nachricht-----
Von: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] Im
Auftrag von Keith McCabe
Gesendet: Montag, 23. April 2007 00:55
An: amsat-bb@amsat.org
Betreff: [amsat-bb] Re: CP-4 Apr 22, 2007 pt.2

On Apr 22, 2007, at 3:14 PM, Mike Rupprecht wrote:
> Is anybody there who can explain the telemetry ?


Hi Mike,

Apologies for being slow, I've been very busy these past few days and  
haven't had much of a chance to look at incoming telemetry reports.

Regarding the telemetry you've been decoding, there seems to be a  
slight problem; the big packets are missing a few bytes (and seem to  
be missing different ones, from the different sizes you're getting).   
That packet should be 115 bytes (99 payload + 16 AX.25 header).  I've  
been trying to decode them "by hand" but it's been a slow process so  
far.  Any chance you have audio recordings of some of these beacons?

A meager explanation of the CP4 telemetry can be found here: http:// 
polysat.calpoly.edu/CP2_ops.php , though it's still missing some  
information (conversion specifiers for byte readings into real values).

Regardless, thanks for all the beacons!  You've gotten more than we  
have.  :)
Keith McCabe, KI6CWF
PolySat, Cal Poly, SLO



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