Construisez votre emetteur FM : Conception et realisation by Remy Mallard

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By Remy Mallard

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Tentatoo – Bien sûr que si. 12. Sepatoo – Très amusant. Tentatoo – Mais je ne me moque pas ! Ce synoptique n’est là que pour vous aider à retrouver les diverses fonctions du montage. Sepatoo – Si vous le dites. Tentatoo – Allons, regardez bien ce synoptique, et énumérez-moi simplement les composants principaux du schéma complet qui remplissent les fonctions indiquées. Sepatoo – C’est bien parce que c’est vous. 11 CONSTRUISEZ VOTRE ÉMETTEUR RADIO FM 50 CHAPITRE COMPOSITION DU SIGNAL MULTIPLEX (MPX) 3 © DUNOD – La photocopie non autorisée est un délit.

Tentatoo – Mais enfin Sepatoo, même si cela avait été le cas, auriez-vous pour autant abandonné votre beau projet ? Sepatoo – C’est bien possible. Voyez-vous, les selfs ont toujours été des bêtes noires pour moi. 10 CONSTRUISEZ VOTRE ÉMETTEUR RADIO FM 24 CHAPITRE © DUNOD – La photocopie non autorisée est un délit. LES TRAITEMENTS APPLIQUÉS AU SIGNAL BF Tentatoo – Je tiens à vous rassurer tout de suite. Il y a des selfs qui sont très simples à construire, et d’autres qui demandent un peu de patience.

Sepatoo – Voulez-vous dire que le signal utile qui a servi à moduler l’onde porteuse, va être dégradé du fait même de la modulation de fréquence ? Tentatoo – Oui. La dégradation principale concerne le rapport signal sur bruit, qui devient de plus en plus mauvais au fur et mesure que l’on monte en fréquence. Les sons aigus sont plus fortement affectés par le bruit de la transmission que ne le sont les sons graves. Et pour simplifier la chose, la musique comporte souvent plus d’énergie dans les basses fréquences, surtout quand elle n’est pas exagérément traitée après l’enregistrement.

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