# 4.2.2 Sensitivity mode
In this calculation mode the function *blockMax Interf Signal *(*Df*) that you entered represents the absolute power level (in dBm) of maximum interfering signal (maximum acceptable interfering power), which might be tolerated by the receiver at a given frequency separation (see [A8.7](https://ecowiki.atlassian.net/wiki/spaces/SH/pages/492697 "https://ecowiki.atlassian.net/wiki/spaces/SH/pages/492697")).
In this case SEAMCAT calculates the receiver attenuation, Attenuation (*Df*), to be applied to the interfering signal by using the following expression:
[](https://wiki.cept.org/uploads/images/gallery/2026-04/a4rFxolbIjEp2vdB-image.png)
*(Eq. 23)*
where:
- D*f* = (*fILT - fVLR*) is the frequency separation;
- *sensVLR* is the sensitivity of the VLR (dBm) as defined in the simulation scenario.
To achieve a realistic value, you may define the sensitivity (*sensVLR*) as (see the figure below):
*Sensitivity = Noise Floor + C/(N+I)*
*Sensitivity = -110 dBm + 16 = -94 dBm*
**Figure 103: Setting up the sensitivity in SEAMCAT**
Then the attenuation may be evaluated:
*Attenuation (Df ) = 40 + 94 + 16 - 0 = 150 dB*
*iRSSblocking = Interfering Signal Level (f it )= -54.5 - 150 = -204.5 dBm*
This can be checked by running a simulation and displaying the iRSSblocking in case of Sensitivity mode calculated by SEAMCAT see Figure 104.
**Figure 104: Mean iRSSblocking in case of Sensitivity mode**