Xatcobeo transmits in 437.365 MHz , this frequency was coordinated with IARU to avoid interferences with other satellites in the Amateur Satellite Service. The modulation used by the TTC subsystem is FM with FFSK/MSK at 1200bps in the baseband. One cycle of 1200Hz represents a logic ‘1’, one-and-a-half cycles of 1800Hz represents a logic ‘0’. Output RF power is 27 dBm. A Turnstile antenna is used on-board.
CW beacon: Xatcobeo transmits a CW beacon every 75/150 seconds and may transmit housekeeping (HK) frames (see next section) intercalated between beacons if TM is activated. CW is transmitted at 20 WPM as an 800Hz audio on-off keyed signal in FM. CW beacon can contain different parameters: battery voltage (V), signal received (dBm), temperatures (c, Celsius degrees).
STRaND-1 Telemetry 16-10-2013 18:55 UTC
Max elevation 63 degree, azimuth between 012 – 207 degrees.
This evening the packet bursts where very long and therefor I received an unbelievable amount of frames. There were a total of 1070. I wonder what kind of experiments Chris and his team are doing.
SWISSCUBE Telemetry 14-10-2013 13:15 UTC
Max elevation 72 degree, azimuth between 013 – 203 degrees.
And then there are those days when this hobby has a surprise for you, in the past I tried to download SWISSCUBE data but that wasn’t a success. This afternoon the little Cubesat was very strong and I was able to receive and decode the BPSK data.
With the help of JA0CAW I can now decode the complete kiss file. Below the tlm output from the de decoder software.
SwissCube Housekeeping Telemetry Decoder (c) Mike Rupprecht, DK3WN
====================================================================
COM last report time 2507972.00 s (29d 00:39:32)
ADCS last report time 2507970.19 s (29d 00:39:30)
CDMS last report time 0
Payload last report time 2507970.19 s (29d 00:39:30)
Battery 1 Voltage 3.81 V | Battery 1 redundancy V 3.81 V
Battery 2 Voltage 3.97 V | Battery 2 redundancy V 3.97 V
Battery 1 Temp -2 °C | Battery 2 Temp -2 °C
Digital power bus V 3.28 V | Analog power bus V 3.26 V
External Temp -1 °C | Frame Temp -3 °C
Microcontroller Temp -12 °C | Board Temp -8 °C
Motherboard Temp -4 °C | Solar cell -X current 0.00 mA
Solar cell +X current 179.73 mA | Solar cell -Y current 62.52 mA
Solar cell +Y current 3.91 mA | Solar cell -Z current 27.35 mA
Solar cell +Z current 445.42 mA | Face -X temperature -7 °C
Face +X temperature -2 °C | Face -Y temperature -11 °C
Face +Y temperature -3 °C | Face -Z temperature -5 °C
Face +Z temperature -2 °C |
Payload ENABLED | ADCS ENABLED
ADS 1/2 status OFF | Payload status ON
ADCS status ON | CDMS status OFF
Beacon status ON | COM status ON
Payload error flag OK | ADCS error flag OK
CDMS error flag OK | COM error flag OK
EPS error flag OK | Spare 2 bits (not used) 0 0
Spacecraft mode SAFE | Error code SUCCESS
SDR image where you can see the different tones of the BPSK signal. Decoding was done with the AFSK modem from UZ7HO.
AENEAS Telemetry 13-10-2013 18:53 UTC
Max elevation 53 degree, azimuth between 237 – 043 degrees.
AENEAS Raw AX25 frames:
1:Fm KE6YFA-1 To CQ Via TELEM [20:54:25R]
4341455255531D0040020009030B0616342837050000001000F075000070130049C062D941F1E1
1:Fm KE6YFA-1 To CQ Via TELEM [20:54:44R]
4341455255531D0040020009030B0616350037050000001000F075000070130049C062D941202F
1:Fm KE6YFA-1 To CQ Via TELEM [20:55:04R]
4341455255531D0040020009030B0616351437050000001000F075000070130049C062D941F6D7
1:Fm KE6YFA-1 To CQ Via TELEM [20:55:24R]
4341455255531D0040020009030B0616352837050000001000F075000070130049C062D9419DD6
AENEAS Decoder output:
AENEAS Beacon Data Decoder, Rev 1.1
Opening file at input.txt
AENEAS Beacon TLM Packet found:
---------TELEMETRY-BEGIN----------
Total length: 29
Type:64
Unused: 0x02 0x00
Time: 9/3/11-6-22:52:40
Reboots: 1335
Last Reboot Cause: 0
Flash Status: 0
Bit 0 = 0 : Device is ready.
Bit 1 = 0 : Device is NOT write-enabled.
Bit3&4= 1 : All sectors software-protected.
Bit 4 = 0 : WP is asserted.
Bit 5 = 0 : Last op successful.
Bit 7 = 0 : Sector Protection Registers unlocked.
Payload Write Pointer: 1273856
Telemetry Pointer: 7729152
Radio Status: 73
No detailed Radio info yet
Misc Write Pointer: 1104765632
---------TELEMETRY-END----------
CW beacon: Xatcobeo transmits a CW beacon every 75/150 seconds and may transmit housekeeping (HK) frames (see next section) intercalated between beacons if TM is activated. CW is transmitted at 20 WPM as an 800Hz audio on-off keyed signal in FM. CW beacon can contain different parameters: battery voltage (V), signal received (dBm), temperatures (c, Celsius degrees).
