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Add HF bands, noise figures

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Sélène Corbineau 2026-03-23 08:18:30 +01:00
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handbook.tex
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@ -193,10 +193,40 @@ for larger transistors.
\chapter{Telecommunications} \chapter{Telecommunications}
\section{Amateur radio} \section{Amateur radio}
\paragraph{HF frequency allocations (region I)} \paragraph{HF frequency allocations (Mainland France)}
\paragraph{Q-code} \begin{fulltab}{lll}
\toprule
Name & Range & Comments\\
\midrule
80\unit{\meter} & 3.500 - 3.800 \unit{\mega\hertz} & Shared \\
60\unit{\meter} & 5.3515 - 5.3665 \unit{\mega\hertz} & Secondary \\
40\unit{\meter} & 7.000 - 7.200 \unit{\mega\hertz} & \\
30\unit{\meter} & 10.100 - 10.150 \unit{\mega\hertz} & Secondary, 15W EIRP \\
20\unit{\meter} & 14.000 - 14.350 \unit{\mega\hertz} & \\
17\unit{\meter} & 18.068 - 18.168 \unit{\mega\hertz} & \\
15\unit{\meter} & 21.000 - 21.450 \unit{\mega\hertz} & \\
12\unit{\meter} & 24.890 - 24.990 \unit{\mega\hertz} & \\
10\unit{\meter} & 28.000 - 29.700 \unit{\mega\hertz} & \\
\bottomrule
\end{fulltab}
\paragraph{Purity limits} \paragraph{Purity limits}
HF and below: -50dBc if >5W carrier, otherwise -43dBW.\\
VHF and above: -43dBW.
\paragraph{Ambient radio noise} \paragraph{Ambient radio noise}
With $F$ the ratio between the effective temperature due to radio noise and
ambient, $F_m$ the minimal value expected,
\begin{fulltab}{lll}
\toprule
Frequency & $F_m$ & $e_n$ in 50\unit{\ohm}, 3\unit{\kilo\hertz}\\
\midrule
500\unit{\kilo\hertz} & 60dB & 49\unit{\micro\volt}\\
3\unit{\mega\hertz} & 40dB & 4.9\unit{\micro\volt}\\
30\unit{\mega\hertz} & 20dB & 490\unit{\nano\volt}\\
\bottomrule
\end{fulltab}
\section{Character encodings} \section{Character encodings}
\paragraph{7-bit ASCII} \paragraph{7-bit ASCII}