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 On 16-07-2013 10:22 UTC
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
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
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
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.
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
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.
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
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.
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.