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+$\text{ppm}$ steht für *parts per million*, also $1$ pro $10^6$, dies passt sehr gut zur angegebenen Frequezne in $\unit{\mega\hertz}$ also $\qty{10^6}{\hertz}$.
+Ein $\text{ppm}$ von $\qty{435}{\mega\hertz}$ sind also genau $\qty{435}{\hertz}$.
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