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On this page you can find the latest status of Delfi-C3 including its operating frequencies, latest TLEs, and information about helping to decode and collect data from Delfi-C3. Current Spacecraft Status Operational mode:
| science mode
| Operational radio:
| radio 1 |
Since the spacecraft may autonomously switch between radios in science and basic operational modes, it may occur that the telemetry downlink is not available on the specified downlink frequency. Please find an overview of all the downlink frequencies in the different operational modes below. | Operational mode | Radio 1 | Radio 2 | | Basic | 145.870 MHz 1200 Baud BPSK AX.25 housekeeping telemetry only | 145.930 MHz 1200 Baud BPSK AX.25 housekeeping telemetry only | | Science | 145.870 MHz 1200 Baud BPSK AX.25 housekeeping & payload telemetry | 145.930 MHz 1200 Baud BPSK AX.25 housekeeping & payload telemetry | | Transponder | Uplink: 435.570 - 435.530 MHz Downlink: 145.880 - 145.920 MHz (inverting) Beacon: 145.870 MHz CW |
Notes: - Due to the spacecraft's orbit, Doppler shift should be taken into account for all frequencies specified above
- Since the downlink signal is BPSK modulated, a receiver/transceiver capable of receiving Upper Side Band (USB) is required
- The telemetry is transmitted in AX.25 UI frames using DLFIC3 as the source address and TLM as the destination address
- Delfi-C3 does not have a battery on-board and will therefore only be active in sunlight!
- Delfi-C3 also has an emergency mode: 145.930MHz, 2 Double Sideband modulated audio tones of approx 500Hz and 900Hz, the tones themselves are modulated with 100bd FSK each. Please send us an audio-recording (wave file) in case your hear this mode.
Latest Two Line Elements Updated on:
| December 5th 2009, 13:00 (GMT + 1) | | Source: | NORAD data, object # 32789 |
Delfi-C3
1 32789U 08021G 09337.78692969 .00000233 00000-0 36164-4 0 5435
2 32789 97.9287 40.3634 0015345 197.2935 162.7756 14.81875920 86561 |
Pass Reports If you hear Delfi-C3, please send a pass / reception report to
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In the report, please state the following items: - Your name and callsign
- Your location (maidenhead gridsquare or latitude / longitude)
- Time of Acquisition Of Signal (AOS) and Loss Of Signal (LOS) stated in UTC / GMT
- Frequency you have heard Delfi-C3 on
- Signal strength
- Equipment (antenna, receiver, etc.)
Beside submitting this report we would like you to try and decode telemetry for us by receiving the RASCAL telemetry decoding software (see below). If you use a TNC, please send us the KISS file (.kss) along with the report. If this is not possible we would like to ask you to send us a WAVE file recording of the pass and attach that to the report. Telemetry Decoding Software We would like to ask all amateur radio operators / HAMs across the world to help us collect data from our satellite. This can be done by downloading our telemetry decoding software and letting it decode the telemetry downlink signal. This software package will automatically send the decoded telemetry to our data collection server(s), which will allow us to gather and analyse far more data than would otherwise be possible. Submitting decoded telemetry can be done anonymously, but we would like to encourage you to request an account by sending an e-mail to
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including the following information: - name
- callsign
- location (maidenhead gridsquare)
Overview of participating radio-amateurs (based on gridsquare information, only showing users who have registered an account) Go to the download page
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Mission Operations 
