% Author: Michael Groni, DB7YI
% Year: 2023
\begin{tikzpicture}

	\tikzstyle{digitalNumber}=[draw=DARCgray, fill=white, minimum width=0.5, minimum height=0.5, rounded corners=1, font=\bfseries]
	\def\yNumbers{-5.2}

	\begin{axis}[
		axis lines=middle,
        width=\linewidth*\getDarcImageFactor,
        height=4cm,
		scale only axis,
		yticklabel=\empty, ytick={},
		xticklabel=\empty, xtick distance=5*360, xmajorgrids,
		scaled ticks=false,
		clip=false,
		xlabel={$t$},xlabel style={anchor=north}, ylabel={$U$}, ylabel style={anchor=east}, title=FSK,
		xmin=0, xmax=11100, ymin=-4.7, ymax=4.7, axis line style={-triangle 60} % xmax: 11100 = 30*360 + 300
	]
		\addplot [ draw=DARCblue, domain=0:5*360,       samples=800 ] {4*sin(0.8*x)};
		\addplot [ draw=DARCblue, domain=5*360:10*360,  samples=800 ] {4*sin(0.8*x)};
		\addplot [ draw=DARCblue, domain=10*360:15*360, samples=800 ] {4*sin(1.6*x)};
		\addplot [ draw=DARCblue, domain=15*360:20*360, samples=800 ] {4*sin(0.8*x)};
		\addplot [ draw=DARCblue, domain=20*360:25*360, samples=800 ] {4*sin(1.6*x)};
		\addplot [ draw=DARCblue, domain=25*360:30*360, samples=800 ] {4*sin(1.6*x)};
		
		\node [digitalNumber] at (axis cs:  2.5*360, \yNumbers) {0};
		\node [digitalNumber] at (axis cs:  7.5*360, \yNumbers) {0};
		\node [digitalNumber] at (axis cs: 12.5*360, \yNumbers) {1};
		\node [digitalNumber] at (axis cs: 17.5*360, \yNumbers) {0};
		\node [digitalNumber] at (axis cs: 22.5*360, \yNumbers) {1};
		\node [digitalNumber] at (axis cs: 27.5*360, \yNumbers) {1};		
	\end{axis}
		
\end{tikzpicture}