Notes/Extracurricular/FCG/Radio reception.md

• 110m, distance from centers EA->BB

FSPL

\begin{gather}
FSPL(dB) = 20\log_{10}(d) + 20\log_{10}(f)+20\log_{10}\left( \frac{4\pi}{c} \right) \\
FSPL = 20\log_{10}(0.1) + 20\log_{10}(446) + 36.44\\
\approx 66 dB
\end{gather}

Loss just by transmitting (assuming 0 gain for both transmit and receive). Pretty bad.

Wall attenuation

• Assuming 1 meter thickness per wall, estimate 15dB loss, assuming max 4 walls

66dB+ 60dB = 126dB

Total Loss

27 - 126 = -99dBm

Conclusion

Assuming -100dBm is the sensitivity bound, that shit is BARELY above it. Any interference would cause us to not hear each other.