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\subsection{Simplex (0x07)}
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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}