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Contents de Radiofil magazine 83
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Restoration :
Restauration d'un autoradio Radiomatic by Dominique Olivie.
Here is the restoration of a Radiomatic M3S valve car radio in « as found » condition and quite rusty, but apparently complete, which I unearthed in a second hand shop. This model dates from 1962 and is a hybrid valve/transistor set using valves operating with only 12V on the anode, which greatly simplifies the power supply circuits. Having unfortunately not found the circuit diagram, I had to make do without.

Technical pages :
Réception de la DAB by Jean-Paul Hervé.
This article describes the experience I had with RNT (DAB+) from Switzerland, a neighbouring country only about 150km away. Bearing in mind that more or less everywhere in France RNT is beginning to emerge, many will find themselves,immediately or in the near future, in a situation similar to mine no matter where they are located. The frequency band to be considered is at VHF, from 174MHz up to 240MHz.

Military radio :
L'émetteur récepteur SFR TBG1 by Daniel Maignan.
This equipment is shown in the photo on the back cover. It’s an emergency services set with eight valves, operating in the Medium Wave band, made by Societe Francaise Radioelectrique (SFR) in the 40’s-50’s for terrestrial or maritime mobile stations.

History of men :
L'Emission Maritime by Denis Biget.
Sailing, either for fishing or for pleasure, cannot do without electronics. All fishing vessels, from the smallest to the largest, are equipped with radio, sounders, radar, positioning equipment. On board electronics is even invading pleasure craft. Many boats nowadays possess VHF radio, sounders, radar, thanks to the appearance on the market of equipment which has become more and more sophisticated, easy to use and relatively affordable.

Atelier :
Une alimentation continue réglable de 1,8 à 12 V by Gérard Chevaillier.
Perhaps you have just completed a small transistorised project and are looking for a DC supply, between 3 and 12 volts, with which to power it. There are two solutions available to you, the first being to rush out and buy batteries. The second, much more practical and cheaper, is to have to hand a small power supply capable of providing this range of voltage. Besides, such a supply is invaluable when working with weak signals or at high frequency, where switched-mode supplies are not suitable.
Rebobinage d'un transformateur by Alain Fargeix.
Durant cette période de novembre où la météo est maussade, je me suis attelé à rédiger l’article que je vous présente ici et qui décrit le rebobinage d'un transformateur de puissance. Je n’ai rien inventé, mais seulement fait preuve d’une certaine audace pour me lancer dans cette aventure. Je dois toutefois le dire, ce n’est pas ma première expérience dans ce domaine, car j’ai déjà fait un transformateur de 800 volts (seulement !) pour l’amplificateur linéaire d'un ami et également un autre pour un poste de soudure à colonne. Bobiner du fil méplat de 6 x 3 mm c'est du sport !

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