tracked with TLE #35004, center frequency = 437.3647 MHz LSB
CP6 internal timestamp wrong – audio frequency of the CW trailer at
Sequence Number: 10995 Timestamp: 2009-May-05 21:13:02 - 1250 Hz Sequence Number: 10997 Timestamp: 2009-May-05 21:14:01 - 1310 Hz Sequence Number: 10999 Timestamp: 2009-May-05 21:15:00 - 1250 Hz Sequence Number: 11001 Timestamp: 2009-May-05 21:15:59 - 1300 Hz Sequence Number: 11003 Timestamp: 2009-May-05 21:16:57 - 660 Hz * jumped 640 Hz * Sequence Number: 11005 Timestamp: 2009-May-05 21:17:56 - 720 Hz Sequence Number: 11007 Timestamp: 2009-May-05 21:18:55 - 760 Hz Sequence Number: 11009 Timestamp: 2009-May-05 21:19:54 - 810 Hz
There are similar jumps in the COMM_A and COMM_B currents. Maybe this is the reason for the jumps in frequency ?
Mark, N8MH: Just read your observations about CP-6 frequency jumps. I have seen exactly the same thing for days now. I thought it was bad Kep elements :) I’ve seen it drop back in frequency toward the end of a pass, too. It is about a 600-700Hz jump, from what I’ve seen here.
Good work :)
Mike,
Thanks for quantifying this! Good job. I had seen similar in the CP4 satellite. Hopefully the CalPoly guys will get this fixed in the next cubesat, as it makes unattended operation impossible, and attended operation “sporty.”
73s,
Alan
WA4SCA