\subsection{Simplex (0x07)} 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}