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Contents of the magazine
Sommaire général
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Contents de Radiofil magazine 53
<< Previous November-December 2012 Next >>
Couverture magazine

Ivory sheets :
Modèle 4 de 1924 fabriqué par CES (Comptoir Electro-Scientifique) by G. Cuciuc.

Restoration :
Un poste à transistors Reela « Tentation » de 1961 by J-P. Hervé.
This set, equipped entirely with germanium semi-conductors, comprises of six transistors and one diode. Manufactured at the beginning of the sixties it has a plywood case sheathed in plastic, which corresponds well with the style of that period.

Technical pages :
Le tour du cadre by D. Maignan.
3e partie
We know that it is possible to use a loop instead of a wire antenna for receiving radio waves. With this kind of setup due to its structure the receiver is connected to an electrically close circuit and the signal received results entirely from the high frequency current induced by the magnetic component of the electromagnetic field. Having covered the basic theory of operation, let’s now look at some straightforward practical examples which you can easily tackle. This third part covers the description of two loops, the first of « photo frame » format from the fifties and the other of low impedance, amplified design.

Realization :
Captez France Bleu en ondes moyennes by G. Chevaillier.
Un poste à variomètre
The little project which I propose for construction is primarily aimed at familiarising you with “ basket loop ” coils. To do this, nothing better than to build a radio for medium wave reception, equipped with a “ variometre ”. No electrical supply is required. Despite its simplicity this radio is capable of receiving the station France Bleu at a comfortable listening level.

Testimony :
Constructeurs méconnus : Melodia by G. Fritsch, M. Receveur.
Une marque peu connue à l’échelon national, mais très connue en Lorraine
Je tenais à parler dans les pages de Radiofil magazine de l’un de ces petits constructeurs de radio et télévision, Mélodia Radio, aujourd’hui totalement méconnu.

Retro audio :
Un ampli Mc Intosh MC75 by D. Adiro.
One of my friends asked me if I’d like to “ look at ” an old amp which no longer functioned very well but which he still valued; I agreed, without great enthusiasm. A friend is a friend… But once having seen the amplificateurfier in question my eyes lit up ! To restore an almost mythical piece of equipment, practically impossible to find these days, suddenly became a reward rather than a favour bestowed ! The Mc Intosh MC75 is a legend in all respects : volume, weight, power, performance, musicality, simple lines, technical innovation… The brand, which went on to become legendary, made a major impact when launching this model destined primarily for the professional radio, sound and cinema market. I had the notion to share with radiofilistes the sweet sensation felt after restoring this icon in the field of audio amplification. The hardest part was to return it to its owner who confirmed in no uncertain terms that he didn’t want to part with it. Ah, friends…

History of techniques :
La TSF by J-C. Montagné.
5e et dernière partie
We come into the 20th century with some tools which can be used for the development of wireless. We know how to transmit Hertzian waves, although the specialists are not yet too sure of the nature of the almost contradictory relationships between wavelength, effective range and power required. Progression from the spark gap which generates damped waves, to the arc converter where resultant oscillation is at constant amplitude (continuous wave), will enable modulation of such a wave to be considered. A practical means of doing this still remains to be found.

Atelier :
Un poste à réaction by M. Guy.
Reaction-based detection has for a long time equipped many receivers due to its ease of construction and low cost. The simple project described here might trigger the same keen interest today with those who, having originally started with galene or battery sets, wish to move up a gear… with three valves and a handful of components.

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