From 9cf45c746719f59219a2b8217e34d59e0a68d148 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9l=C3=A8ne=20Corbineau?= <selene.corbineau@ens.fr>
Date: Mon, 23 Mar 2026 08:18:30 +0100
Subject: [PATCH] Add HF bands, noise figures

---
 handbook.tex | 34 ++++++++++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/handbook.tex b/handbook.tex
index d42ba2f..10abc81 100644
--- a/handbook.tex
+++ b/handbook.tex
@@ -193,10 +193,40 @@ for larger transistors.
 
 \chapter{Telecommunications}
 \section{Amateur radio}
-\paragraph{HF frequency allocations (region I)}
-\paragraph{Q-code}
+\paragraph{HF frequency allocations (Mainland France)}
+\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}
+HF and below: -50dBc if >5W carrier, otherwise -43dBW.\\
+VHF and above: -43dBW.
+
 \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}
 \paragraph{7-bit ASCII}