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A CATS station may want to articulate a frequency for voice purposes. This would usually be for transmitting what frequencies the station is monitoring. Each simplex whisker represents a single frequency. \textbf{A valid CATS packet may contain zero or more simplex whiskers.}

\subsubsection{Structure}

{\def\arraystretch{1.3}
\begin{tabular}{|l|l|l|l|}
  \hline
  \textbf{Byte offset} & \textbf{Length} & \textbf{Value} & \textbf{Description} \\
  \hline
  0 & 1 & 0x07 & Whisker type \\
  \hline
  1 & 1 & 6 & Whisker length in bytes \\
  \hline
  2 & 4 & & Frequency (unsigned integer, Hz) \\
  \hline
  6 & 1 & & Modulation type (See modulation table) \\
  \hline
  7 & 1 & & Power (unsigned integer, ${4 \over{\text{dBm}}} x$, 255 = unknown) \\
  \hline
\end{tabular}
}

\subsubsection{Modulation Table}

\begin{tabular}{|l|l|}
  \hline
  \textbf{Modulation ID} & \textbf{Modulation type} \\
  \hline
  0 & Unknown/unlisted \\
  \hline
  1 & CATS \\
  \hline
  2 & FM (5.0 KHz deviation) \\
  \hline
  3 & AM \\
  \hline
  4 & USB \\
  \hline
  5 & LSB \\
  \hline
  6 & CW \\
  \hline
  7 & FreeDV \\
  \hline
  8 & M17 \\
  \hline
  9 & D-STAR \\
  \hline
  10 & DMR \\
  \hline
  11 & Fusion \\
  \hline
  12 & P25 \\
  \hline
  13 & NFM (2.5 KHz deviation) \\
  \hline
\end{tabular}