% Author: Prof. Dr. Matthias Jung, DL9MJ
% Year: 2026
\begin{tikzpicture}
    % Achsen
    \draw[-Triangle](0,0) -- ++(0,1.25) node[anchor=south] {$Q$};
    \draw[-Triangle](0,0) -- ++(1.5,0) node[anchor=west]  {$I$};
    \draw(0,0) -- ++(-1.25,0);
    \draw(0,0) -- ++(0,-1.25);

    % Hilfskreise für die vier Amplituden
    \draw[gray](0,0) circle (0.25);
    \draw[gray](0,0) circle (0.50);
    \draw[gray](0,0) circle (0.75);
    \draw[gray](0,0) circle (1.00);

    % Symbolpunkte
    \draw(0.25,0) node[anchor=center, circle, draw, fill=DARCblue](m0){};
    \draw(0.50,0) node[anchor=center, circle, draw, fill=DARCblue](m1){};
    \draw(0.75,0) node[anchor=center, circle, draw, fill=DARCblue](m2){};
    \draw(1.00,0) node[anchor=center, circle, draw, fill=DARCblue](m3){};

    % Bit-Zuordnung
    \draw(m0.south) node[anchor=north] {$00$};
    \draw(m1.south) node[anchor=north] {$01$};
    \draw(m2.south) node[anchor=north] {$10$};
    \draw(m3.south) node[anchor=north] {$11$};
\end{tikzpicture}