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Contents de Radiofil magazine 82
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Restoration :
Une restauration virtuelle by Pierre Barrat.
This is a story about a receiver dating from the 50’s where considering my interest in it versus work to be done led me to focus only on a documentation research. It’s a Teleson model Soprano Type 54S. It has a distinctive look, but is otherwise quite commonplace and in mediocre condition. It is complete, however the control knobs don’t match and the lettering on the dial is flaking away.
La réparation des circuits imprimés
Bulletin Radiola
In some equipment the components such as resistors, capacitors, valve bases, coils, etc. are connected by means of strips of copper deposited on a bakelite impregnated cardboard base.

Realization :
Un détecteur à limaille de Branly expérimental by Jacques Hildebert.
Comme suite à l’excellent article de Jean Gadreau paru dans le numéro 77 de la revue Radiofil, je vous présente ici l’une de mes dernières réalisations : un cohéreur de Branly.

Trick :
Un convertisseur FM-AM by Michel Fiol.
This article shows how one can easily, in a few minutes, install an FM/ AM converter which preserves the integrity of the Vintage Wireless set, whilst remaining immediately transferrable from one set to another. The end of the article gives an example of the construction of one of these converter modules.

History of techniques :
Comment faire de la radio dans un tunnel by Victor Cordoba.
La radio dans le tunnel sous la Manche
Let’s try, before getting technical, to find our bearings and understand the layout of a tunnel, the Channel Tunnel. This underground crossing is 49km long, with 35km effectively under water. In reality the tunnel is composed of three tunnels : an « RTN » (Running Tunnel North), an « RTS » (Running Tunnel South) and, between them, an « ST » (Service Tunnel). Connecting these three tunnels there are « CP » (Cross Passage) links (figure 1). This description of radio within the tunnel gives an idea of what existed 25 years ago, but it is likely that the system has since been completely digitised.

Report :
Le centre émetteur RMC de Roumoules by Daniel Werbrouck.
Partie 2
Thanks to our guide, Centre chief Pascal Panella, we have been able to visit this transmitting station which is remarkable for its long wave (for the RMC programme) and medium wave installations, requiring equipment beyond the standard known to Vintage Wireless enthusiasts… In the previous edition of Radiofil magazine, we introduced, on the one hand, the transmitters and their principles of operation and modulation which called for specific technology primarily aimed at maximising output and, on the other hand, the aerials consisting of impressive looking radiating masts. We complete our story by looking at the challenge of maintenance and security of the Centre, and include an explanation of some phenomena induced by the immense electromagnetic field radiated close to the aerials.

Atelier :
Une alimentation haute tension réglable de 80 à 320 volts by Jean Cornu.
In the following article I will share with you the circuit diagram of this modest power supply which I found in my technical archives. This gave me the urge to build it, especially since it is very simple, classic and comprises of only one integrated circuit, the 5 volt regulator.
Un amplificateur audio de 12 watts avec des fonds de tiroirs by Bernard Dailly.
The construction of this amplifier will cost you nothing. Everything is made from parts to be found in the junk box which most of us possess. Without, obviously, competing with high end equipment, the objective of this exercise is to show that you can complete such a project, by developing a good-sounding amplifier, with the added satisfaction of having built it yourself.
Un circuit temporisateur pour postes tous-courants by Bernard Thomas.
Collectors who power up their receivers regularly, which is highly recommended, are always apprehensive when switching on an AC/ DC set. This is because, due to the low resistance of the filaments when cold, there is a « flash » in one of the valves as its filament goes white hot for a fraction of a second. Even if this seems normal, since we don’t really see a reduced lifetime on the valves in such sets.

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