CP-6 jumps

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

cp6_31052009

There are similar jumps in the COMM_A and COMM_B currents. Maybe this is the reason for the jumps in frequency ?

cp6_comm_a_curr cp6_comm_b_curr

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 :)

One thought on “CP-6 jumps”

  1. 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

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