Radio Amateurs
HAM radio information for contacting Aalto-1 satellite (OH2A1S)
- The satellite will be launched on June 23. 2017 (TBC) with Indian PSLV rocker on a sun-synchronous orbit (TBC)
- Launch time 03:59 GMT
- Orbit Two-Line Elements
UHF Telecommand uplink / Telemetry downlink / CW beacon
- Frequency: 437.220 MHz
- Bandwidth: 13 kHz
- Max TX power: 1.2 W (dBm 30.8)
- Modulation: GFSK, deviation 3 kHz
- 6 second long beacon every 180 s CW beacon followed by an AX.25 data message
- Information contained in CW beacon:
- Callsign: AALTO1
- Information contained in AX.25 (G3RUH compatible, 9600 bauds) beacon
- Callsign: From OH2A1S to OH2AGS
- UI-frame containing following fields TBD
- Information contained in CW beacon:
- Telemetry/Telecommand exchange over Aalto Ground Station (OH2AGS) using TI CC1125 packet protocol
- Preamble and sync word: 0x35 0x2E 0x35 0x2E
- Data and symbol rate: 9600 bits/s
- Variable length packets
- Protocol specification: TBD
S-Band Science Data Downlink
- The S-band radio is operated only by request of ground operations team
- Frequency: 2402.000 MHz (S-Band)
- Bandwidth: 1.6 MHz
- Polarization: RHCP
- Max TX power: 1.29 W (31.1 dBm)
- Modulation: GMSK, deviation TBD
- Data downlink over Aalto Ground Station (OH2AGS) using TI CC1125 packet protocol
- Preamble and sync word: 0xD3 0x91 0xD3 0x91
- Symbol rate: 500k symbols/s
- Fixed 256 bytes long packets
- Data is transmitted in long bursts with 50% dutycycle
- Optional convolutional code (c=1/2, k=3)
Radio frequencies
- UHF: 437.220 MHz
- S-Band: 2402.000 MHz
Aalto Ground Station (OH2AGS)
Located at Aalto University in Otaniemi, Espoo, Finlands
Maarintie 8, 60.18718° N, 24.81760° E