# 3.2.7 Calculating the dRSS by hand

Using the Free space equation, the power received by the Victim link receiver (dRSS) can be easily derived:

 [![image.png](https://wiki.cept.org/uploads/images/gallery/2026-04/scaled-1680-/jeoa0vl6sKupsFiX-image.png)](https://wiki.cept.org/uploads/images/gallery/2026-04/jeoa0vl6sKupsFiX-image.png) (Eq. 17)

[![image.png](https://wiki.cept.org/uploads/images/gallery/2026-04/scaled-1680-/GjJVR90SCC7b659v-image.png)](https://wiki.cept.org/uploads/images/gallery/2026-04/GjJVR90SCC7b659v-image.png)

[![image.png](https://wiki.cept.org/uploads/images/gallery/2026-04/scaled-1680-/jXJPh3UkDLqpWf1R-image.png)](https://wiki.cept.org/uploads/images/gallery/2026-04/jXJPh3UkDLqpWf1R-image.png)

Keep this calculation in mind, as it will be compared with what SEAMCAT calculates in the following sections.