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Contents of the magazine
Sommaire général
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Contents de Radiofil magazine 78
<< Previous January-February 2017 Next >>
Couverture magazine

Ivory sheets :
Poste à réaction à 6K7

Let us speak about technique :
Les haut-parleurs
The loudspeaker is one of the principal components of a radio receiver. One could even say that it is the most important since, in practice, the other parts of the set are there to provide an output voltage suitable for feeding the loudspeaker which will produce the acoustic energy. For the absolute novice, a radio consists of : a box, knobs and, inside, a loudspeaker. It’s the latter which, often wrongly, is deemed responsible for the malfunctioning of a receiver. This reasoning is logical for the uninitiated, why would the loudspeaker not be the source of the whistles, crackles or humming that can be heard ? We know that the reality is different. It remains true that the loudspeaker has a fundamental role in the functioning and quality of the equipment. In an electroacoustic installation it’s role, more notable, gives it even more importance.
Le décteur de Branly, toujours un mystère by Jean Gadreau.
2e partie
In the second part of this article, we look at making a micro-switch and detectors for the study of the phenomenon of avalanche.

Realization :
Un mini-récepteur FM à TDA 7000 by Daniel Maignan.
Developed and produced in the 90’s by Philips, leader in this domain, this highly integrated IC contains an almost complete FM receiver, from antenna input to audio output. Due to its design almost a quarter of a century ago and although very sophisticated from a functional point of view, it still requires a few discrete external components, which would not have been the case if a modern module had been used, as for instance that of the FM5 receiver, the TEA5767. Since it is still easy to find today, we have decided, for a bit of fun, to present you with the simple design described below which, you will be glad to know, will work first time !
Un amplificateur BF réalisé avec une nouvelle approche by Marc Marinello.
As a faithful subscriber to Radiofil for more than 10 years, the articles published in issues 71 and 72 aroused my interest. I therefore ordered a pair of RTU-101 transformers to construct a valve amplifier. This is not my first such project, I have already built a « Single Ended » amplifier with Svetlana SV811 directly heated triodes (unfortunately no longer in production) and some « Push-Pull » amps based on EL34 pentodes. Since the Radiofil project is pending, I decided to design my own version, with semiconductor components available in 2016, and to get the best from a valve amplifier.

In the course of Web :
L’arrêt de l’émetteur d’Allouis (France Inter grandes ondes 162 kHz)
As most of you know, the Radiofil forum, which is open to all vintage radio and audio enthusiasts, is a hub of good natured discussion and exchange and therefore an invaluable source of information, with regular participation from other countries. We select subjects which we believe will be of great interest to our readers and publish them in the magazine, with particular consideration for those who don’t have Internet. In this issue, the discussion relates to a subject which has touched us all, that is the closing down of the Allouis transmitter and the placatory (sometimes questionable or provocative) responses from spokespersons of Radio France, mediators and others, in their ignorance of radioelectric shadow zones.

Wink :
La chanson du poste à galène by Gabriel Peron.
Lors d’une expo TSF que j’ai effectuée dans une commune de Charente, un visiteur a eu l’amabilité de me remettre le texte d’une chanson « à la gloire » du poste à galène. Il m’a signalé que son père l’avait transcrit sur son carnet de chansons vers les années 1920-1930. Je n’ai pas la partition musicale, ni le nom de l’auteur. Je n’ai pas non plus trouvé de renseignements sur internet concernant cette chanson. En tout cas il s’agit d’un texte plein d’humour dans sa transcription d’origine. J’ai pensé que cet écrit pourrait intéresser les lecteurs. C’est la raison pour laquelle je vous le transmets. La personne concernée m’a donné son accord pour la publication.

The HAM page :
Un poste ondes courtes à réaction by Daniel Maignan.
2e partie
In this edition we start on the practical implementation of this regenerative short wave receiver. Armed with ideas on construction to be found below and by following the guidelines provided, enthusiasts will be able to build this set successfully.

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