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Contents of the magazine
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Contents de Radiofil magazine 86
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Life of the club :
Compte-rendu de l'assemblée générale de Neuville-sur-Seine by Daniel Maignan.

Restoration :
Renflouage d'une épave by Daniel Maignan.
A good ten years ago I unearthed this wreck of a battery set at the Clignacourt fleamarket. It was missing most of its parts, apart from the wiring, the two variable capacitors and the two rheostats, with their knobs. I recently rediscovered this fossil wrapped in its coating, cannibalised and which looked as if it had been soaked in a stream. I was suddenly overcome by emotion, I must save this poor devil ! The following describes the different steps of the restoration right up to the final testing of the set.

Let us speak about technique :
Un modulateur AM à fréquences multiples by Eduard Hontele.
Here is the story of a project started a year ago. It deals with a subject a bit unusual to our hobby : modern techniques being used with our Vintage Radios. Most of the broadcast stations which have disappeared from the Short Waves are now streamed on Internet. The advantage is that today, it is possible to re-transmit with this device eight AM frequencies simultaneously on the Short Wave band. In the following lines I introduce you to the second prototype AM01 modulator. The setup, which was on display at the swapmeet the day after our AGM in Neuville-sur-Seine, fascinated the Vintage Radio enthousiasts.

In the course of Web :
Les cadres large bande by Serge Logez.
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 edition, the subject of the discussion relates to wide band loop aerials which often give very good results, provided they are preceded by a preamplifier.

Military radio :
Les débuts de la radiogonimétrie by Serge Huart.
Well before 1914, research into the directivity of aerials and the invention of the loop aerial by Blondel made possible the birth of radio direction finding. This is a system capable of determining the direction of an electromagnetic wave relative to a reference direction, for example the North or the centre line of a ship.

FM :
Le (mauvais) son de la FM by Daniel Werbrouck.
Yes, the title of this article is a little bit provocative. It reflects, unfortunately, a situation all too common today where each innovation in the treatment of FM audio moves what’s broadcast a bit further away from the high fidelity promised, expected or hoped for by the listeners. Because music lovers, with trained ears or not but appreciative of the works and content transmitted on the FM band, could rightly object : what you hear on the various stations bears little resemblance to the original recordings ! Due to ever increasing processing over the last 30 years, artistic value has been replaced by economic value — the only driver acceptable to the bosses of these radio networks. Dear listeners, the soup is served ….. We are going to try to understand why we have come to this point and how the engineers have succeeded in making FM a domain of low sound quality, helped by the most modern and sophisticated technology which could have led to Ultra-High-Fidelity, if they had been steered along a less commercial route.

History of techniques :
Les instruments de musique électroniques by Tony Luzy.
Le 19e siècle, l’essor de l’électricité, du magnétisme et des télécommunications électriques
In abolishing the privileges of the clergy and the nobility, the French revolution rang the death knell of experimentation in static electricity and the demonstrations of « electronic » music presented by religious orders in the drawing rooms of the great and the good of this world. The Leyden jar as a source of electricity confined the instruments to being spectacular novelties : the electric battery invented by Alessandro Volta and refined by Georges Leclanche gave a new impetus to the application of electricity. However, we have to wait half a century for the invention of new electro-acoustic equipment, in Europe as well as across the Atlantic, where – should we be surprised ? – some inventions were remarkable by their gigantic size, even to excess.

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