CubeBUG-1 Active

CubeBUG-1 01-10-2013 09:55 UTC Active

The small satellite CubeBUG-1 was active during this pass. I am still unable to decode the data because I am not able to receive a high enough signal. The transmissions are in a clear pattern as you can see in the below SDR spectrum.

CubeBUG-1 TLM 01-10-2013 10:00UTC

16-07-2013 CubeBUG-1 On

CubeBUG-1 On 16-07-2013 10:22 UTC

CubeBUG-1_16-07-2013_10:22UTC

Date and Time: 16-07-2013 10:22 - 10:35 UTC
Object       : 2013-018D
Max elevation: 50 degree
Azimuth      : 018 - 183 degree
Polarization : LHCP Strongest
Signal       : max 15 db above noise
Frequency    : 437.438300 MHz FM +/- doppler
Status       : Active
Remark       : Weak Audio

An IQ wav file was recorded with SDRSharp and can be downloaded via the following link: download

CubeBUG-1 Active again

13-05-2013 09:30 UTC

Date and Time: 13-05-2013 09:20 - 09:30 UTC
Object       : 2013-018D
Max elevation: 15 degree
Azimuth      : 031 - 149 degree
Polarization : RHCP
Signal       : max 15 db above noise
Frequency    : 437.438300 MHz FM +/- doppler
Status       : Active
Remark       : 10 30

13-05-2013 10:56 UTC

CubeBUG-1 13-05-2013 10:56 UTC

Date and Time: 13-05-2013 10:56 - 11:08 UTC
Object       : 2013-018D
Max elevation: 73 degree
Azimuth      : 031 - 201 degree
Polarization : RHCP
Signal       : max 20/25 db above noise
Frequency    : 437.438300 MHz FM +/- doppler
Status       : Active
Remark       : Good signals but unable to decode

Finally CubeBUG-1 data decoded

It was a joint effort of Radio Amateurs, PolySat and the CubeBUG team that finally resulted in the decoding of the faint AX25 signals that are transmitted by CubeBUG-1.

CubeBUG-1 Faint AX25

PolySat had recorded a audio file that could be decoded by DK3WN with the use of MixW. The settings used with MixW where standard VHF 1200 baud modem.

from CUBEB1 to CQ: 
   1 > FF FF F0 00 00 00 00 01 D0 F0 CD 03 00 00 34 08 00 00 00 9B
  21 > 02 B9 01 BD 03 FF 02 D3 02 7E 03 FF 01 88 03 FF 03 3A 03 2A
  41 > 03 FF 03 34 03 B6 00 00 00 03 00 00 00 00 10 02 35 FE E8 05
  61 > D6 00 AF FD AD FF D3 01 29

from CUBEB1 to CQ: 
   1 > FF FF F0 00 00 00 00 01 D1 70 32 03 00 00 34 08 00 00 00 96
  21 > 02 BD 03 FF 03 FF 02 C3 03 75 03 FF 01 7E 03 FF 02 F9 03 29
  41 > 03 FF 03 34 03 E5 00 00 00 03 00 00 00 00 10 01 DF FE CA 05
  61 > DA 00 72 FD 0D FF D3 01 37
3V3Bus_Isense (mA): 236.85
5VBus_iSense (mA): -271.012
Antenna deployment counter: 10
Antenna deployment enabled: False

Array1+_Isense (mA): 348.88
Array1-Vsense (V): 8.96
Array1-_Isense (mA): 139.76
Array2+_Isense (mA): 453.71
Array2-_Isense (mA): 139.76
Array2_Vsense (V): 9.89
Array3+_Isense (mA): -27.10
Array3-_iSense (mA): 79.89
Array3_Vsense (V): 5.14

Battery 1 (C): 8
Battery_Vsense (V): 8.21
Current Mode: SURVIVAL

FreeHeapSize: 13320

Gyroscope X: 175
Gyroscope Y: -595
Gyroscope Z: -45

IMU 3000 Temp: 2.97
Last Seen Seq: 3
Low Voltage Counter: 0

Magnetometer X: 565
Magnetometer Y: -280
Magnetometer Z: 1494

Next Beacon Enable (ticks): 0
NumOfOverflows: 0
Temp Radio (C): 9
TickCount: 30470349
realTickCount: 30470349

CubeBUG-1 faint audio

27-04-2013 18:55 UTC

The first pass was 8 minute with max 5 degree elevation. Signals where stronger when using LHCP. Signal strength 10db above noise. Not possible to decode the AX25 1200 data. Frequency used: 437.438400 MHz FM

27-04-2013 20:29 UTC

The second pass was 12 minute with max 30 degree elevation. Signals where stronger then the one from 18:55 max 20db above noise. You can even see and hear some audio tones but unable to decode.

CubeBUG-1 27-04-2013 20:29 UTC

CubeBUG Audio Spectrogram 20:29 UTC

For those who want to experiment with my received data, you can download the IQ file that I recorded with SDR# on the following location: 27-04-2013 20:29 UTC 16bit PCM IQ file

CubeBUG Heard

26-04-2013 12:20 UTC

Lower in frequency then was communicated a carrier with very weak audio that sounded like AX25 1200 baud. But there are signals that seem to be transmitted from CubeBUG-1.

CubeBUG-1 TLE 26-04-2013 12:20 UTC

CubeBUG-1 TLE 26-04-2013 12:20 UTC

A job well done by the CubeBUG team, congratulations.

26-04-2013 20:08 UTC

Later that evening I listened for CubeBUG-1 and recorded an IQ file. This file can be downloaded at the following location: download. This file is recorded with SDRSharp in 16bit PCM baseband format.