# 1.4.9 Combined interference mechanism

The combination of the ***unwanted emissions and*** ***receiver blocking*** can also be studied simultaneously in SEAMCAT as depicted in Figure 13. See Annex [A2.3](https://ecowiki.atlassian.net/wiki/spaces/SH/pages/492511/A2.3+INTERFERENCE+CALCULATION+COMBINATION#A2.3INTERFERENCECALCULATIONCOMBINATION-A2.3 "https://ecowiki.atlassian.net/wiki/spaces/SH/pages/492511/A2.3+INTERFERENCE+CALCULATION+COMBINATION#A2.3INTERFERENCECALCULATIONCOMBINATION-A2.3") for further details.

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

**Figure 13: Illustration of the combined unwanted emissions and the receiver blocking mechanism in SEAMCAT**