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Contents of the magazine
Sommaire général
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Contents de Radiofil magazine 77
<< Previous November-December 2016 Next >>
Couverture magazine

Ivory sheets :
Schneider Frères Nocturne 1951 by Daniel Maignan.

Outspokenness :
Veuvards and Co by Michel Guy.
Visite guidée du bestiaire de la TSF… et de ses « poils à gratter »
Si l’appartenance à notre association est pour la majorité d’entre-nous un moyen, via le magazine, le forum, la bibliothèque de restaurer de vieilles machines parlantes (et de se faire des amis !), c’est aussi pour une poignée de madrés un moyen de faire du fric. Leur comportement sera jugé inadmissible, irritant, dérangeant ou laissera indifférent selon son propre degré de tolérance.

Realization :
Nos émetteurs AM by Serge Logez.
3e partie
Réalisation d’Éric Titiano : petit émetteur de faible puissance transistorisé. Réalisation de Serge Logez : émetteur de puissance moyenne à transistors et circuits intégrés. Retour sur l’émetteur de Daniel Maignan paru dans le numéro 76 : modifications permettant d'utiliser : soit un cadre ferrite pour les puissances moyennes ; soit un cadre à air ayant un coefficient de surtension très important, pour les puissances les plus importantes.

In the course of Web :
Les transformateurs Audax
Nous publions plusieurs documentations sur les transformateurs Audax que nous avons puisées sur le forum. Nul doute que cela va intéresser nos lecteurs, en particulier pour le dépannage des transistors.

FM :
Réglage des récepteurs et des tuners FM au laboratoire by Daniel Maignan.
In No75 we had a glimpse at the different tests and measurements used to evaluate FM receivers. That allowed us to guage what to expect from good receiving equipment and also to realise when a set is not working well and needs realignment. In this edition we describe a wobulator which is very handy for adjusting tuned circuits, allowing the response to be viewed on an oscilloscope screen. Furthermore, linking in an external marker generator enables perfect containment of the signal within the required frequency limits. Forty five years ago, I described a similar generator in the sorely missed magazine Radio Plans and I thought that, since the 74S124 chip (heart of the system) is still readily available, a new description of its use would be in order in this article. Thanks to an exceptionally long production life, no doubt due to the success met by this product emanating from the Texas Instruments labs in the 70’s, you can construct a very useful device for aligning the circuits in an FM set.

History of techniques :
Le détecteur à limaille de Branly : toujours un mystère ! by Jean Gadreau.
For more than 120 years there have been numerous attempts to explain how the first functioning detectors worked. To this day no-one has been able to do so satisfactorily. This is because often the investigation methods employed didn’t enable testing under realistic operating conditions. As a result it hasn’t been possible to absolutely verify the proposed theories. Recent works in micro and nano electronics aimed at increasing the integration of basic cells into memory and microprocessor devices steered my research towards furthering my knowledge. After a series of experimental measurements I was able to establish the link between the operation of Branly’s « iron filings » detector and a known similar phenomenon which limits the integration density in nanoelectronics. In this article, in addition to the approach leading to an explanation of the phenomenon, I describe the influence of the main parameters of the « iron filings » detector’s construction on its performance. The detectors used for the study are described in detail to enable easy replication by the enthusiast.

The HAM page :
Un poste à réaction à 6K7 by Daniel Maignan.
Première partie
This set should meet the needs of many enthousiasts, radioamateur or not, wishing to listen on the short waves. It is based on regenerative grid detection which is universally known and will always be popular. It’s the ultimate basic technique, still used these days in certain low-cost designs. This receiver continues to be the preferred choice for beginners. It could also be constructed using transistors. Great care must be taken during construction, closely following the advice given, as well as the checks and procedures indicated.

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