WSPR challenge is the idea of Remca PA3FYM and Rob PE1ITR, the principle of which is to evaluate the ability to receive WSPR signals. This principle can be used to verify antenna properties and suitability QTH pre príjem slabých signálov.
The principle is very simple - a table is created according to the reported unique brands captured in 24 hours. At the moment it is the only criterion and does not take into account e.g SNR či vzdialenosť.
An example for comparing two antennas
We connect the first antenna to receiver A and start WSPR decoding, we connect the second antenna to receiver B and start WSPR decoding in the same way. In this case, however, we will use a different brand for WSPR so that we can then compare the result. After 24 hours or more, we will look at http://wspr.pe1itr.com/ and see which receiver picked up more tags.
It is questionable whether the given reception comparison is the best criterion for comparing antennas. If, for example, the first antenna is NVIS and the second is DX, then it can be assumed that the NVIS antenna will win. But is it really better? However, if we are comparing two antennas of a similar type, then this method is important.
It is also possible to compare two receivers, where we divide the signal from one antenna into two receivers with a divider and check which one listens better.