% Author: Dr. Matthias Jung, DL9MJ
% Author: Stephan Kregel, DG1HXJ
% Year: 2022
\begin{tikzpicture}
	\pgfplotsset{
		every axis plot/.append style={line width=0.8pt},
	}
    \begin{axis}[%
        /pgf/number format/1000 sep={ },
        /pgf/number format/use comma,        
        axis lines=middle,
        axis line style={-Triangle},
        width=\linewidth*\getDarcImageFactor,
        height=3cm,
        scale only axis,
        ytick={-1,0,1},
        every major tick/.append style={thick, black},
        %yticklabels={-A,0,+A},
        xtick={0.25*pi,0.5*pi,0.75*pi,pi,1.25*pi,1.5*pi,1.75*pi,2*pi,2.5*pi},
        %xticklabels={$\mathrm{X}_1$,$\mathrm{X}_2$,$\mathrm{X}_3$,$~~\mathrm{X}_4$,$\mathrm{X}_5$},
        grid=major,
        grid style={line width=.1pt, draw=gray!10},
        major grid style={line width=.2pt,draw=gray!50},
        xticklabel=\empty,
        yticklabel=\empty,
        %ticks=none,
        xtick style={draw=none},
        ytick style={draw=none},
        xmin=0,
        xmax=2.2*pi,
        ymin=-1.5,
        ymax=1.5,
        xmajorgrids=false,
        ymajorgrids=false,
        %label style={font=\small},
        xlabel style={at={(ticklabel* cs:1)},anchor=north east},
        ylabel style={at={(ticklabel* cs:1)},anchor=north east},
        ylabel={$U_\mathrm{HF}$},
        xlabel={$t$},
    ]
    \addplot[domain=0:2.0*pi,black,samples=3000] {cos((x*20 + 6*sin(x*2*180/pi))*180/pi)};
\end{axis}
\end{tikzpicture}%