DelfiC3 cubesat recording

The DelfiC3 project is described here and the purpose of this experiment was to see whether a 3 element Yagi for 2 meter is sufficient to catch the signal. With the airspy, and the yagi shown below and sdrshap we found an SNR of approximately 10dB. You need to stay a few meter away from the notebook that records the data to avoid radio frequency interference.

IMG_0908
This is the 3 element yagi discussed further down this blog

This was the passage on 27-feb-2018 at 9:40 at the campus of the TU Delft. The elevation was approximately 30 degrees, and the ground track was eastwards. Mind that the satellite transmit power is no more than approximately 2 Watt and that the distance to the transmitter is some 2000 km.

PE4WJ added: the TX power is 10dB under the total power consumption, which is 2.4W. So 2.4 Watt minus 10dB = 0.24 Watt, or 23.8 dBm.

Last update: 5-Mar-2018

 

 

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2 thoughts on “DelfiC3 cubesat recording

  1. Hi Ernst,

    Nice work! A 3 element yagi is more than enough in a fairly low-noise environment. And in fact, the TX power is some 10 dB lower than 2 Watts. The overall satellite DC power consumption is 2.4 W hi 🙂

    73,

    Wouter Jan PE4WJ

    1. I already suspected something like that, will add this to the article. What matters for reception is power density, and this is simply high because of the narrow bandwidth and the presence of both sidetones.

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