Title: Norme technique B-1;courbes d'intensité de champ pour les liaisons de longueur supérieure à 4000 km, courbes dites de Mexico, pour la gamme de fréquences de 6 à 21 Mc/s. Technical standard B-1; field strength curves for circuits of more than 4000 km in length, known as Mexico City curves, for the frequency range 6 to 21 Mc/s
Subjects: Radio, Radio frequency, Tables, Transmitters and transmission