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Contents of the magazine
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Contents de Radiofil magazine 60
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Ivory sheets :
Petit poste à galène PO à partir d’une copie d'œuf de porcelaine de Fabergé by J. Hildebert.

Restoration :
Le Marconiphone P17B by Y. Antonini.
I purchased this radio in 2009 at the Montreuil-sur-Mer (Pas-de-Calais) second hand market which takes place on July 14th each year and brings together antique dealers, amateur resellers and local stallholders. It’s a renowned event which attracts many foreigners, in particular from England, Belgium and Holland, due to the proximity. I was looking primarily for vintage transistor radios and was intrigued by a black box, surrounded by a mass of jumble on one of the stands. Thinking at first that it was merely a transistor set lying face down, I picked it up. It was only when I saw the G. Marconi logo on the case and the leather handle on the side that I realized I’d come across something more interesting and quickly lifted the cover to see what was inside. It was a valve portable, apparently fairly old, quite uncommon, and in very good condition externally. The seller was asking for 15€ but after a quick discussion we settled on 12€, which is very reasonable.

Let us speak about technique :
The frequency modulation by D. Maignan.
Frequency Modulation (FM) is an integral part of the history of TSF, providing a second wind through the quality reproduction of the programmes broadcast, thanks to a process of transmission and reception which almost entirely retains the characteristics of the low frequency signals.The study of this vast subject will not make you question the fundamental principles of radioelectricity of course; but will compel the reader long steeped in amplitude modulation concepts to view radio differently since: — in FM it’s the variation in frequency which carries the information, no more AM! — for both transmission and reception, almost no further need of linear circuits… — makes use of very high frequencies which often behave differently to high frequencies. FM is another world … The objective is to provide the reader with as much information as possible, from both a historic and a technical perspective, including a section dedicated to the setting up of circuits specific to FM. The article then concludes with practical descriptions of several real applications. We also thought it opportune to devote a section to the basic theory of a frequency modulated signal and therefore provide the reader with a deeper understanding beyond basic premises. Obviously those less comfortable with maths can choose to disregard this part.

Realization :
Alimentation réglable by G. Chevaillier.
In Radiofil magazine n°19, I presented the construction of a 350 VDC power supply with output adjustable via dropper resistors. This archaic method having proved somewhat impractical, I decided to design a simple add-on electronic controller which enables easy adjustment of output voltage through the range of 190 to 340V, which should cover 90% of likely needs.
La construction des selfs en nids-d'abeilles by X. Santos.
This article was inspired by a very old article written by R. Alindre which appeared in the first edition of QST magazine in 1924. It describes a method of construction which any amateur demonstrating application, attention to detail and a bit of patience can adopt to build this type of coil.

History of men :
Ferdinand Braun by M. Receveur.
On the 11 December 1909, two Nobel Prizes in Physics were awarded, one to Guglielmo Marconi and the other to Ferdinand Braun. While the exploitation of Hertzian waves by Guglielmo Marconi is well known to the general public, the discoveries made in this domain by Ferdinand Braun are less so. This 104th anniversary is the opportunity to tell the story of this experimental work on Wireless Telegraphy, which later became Radio.

History of techniques :
Différentes étapes de la fabrication d'un tube by M. Martin.
This article describes the different steps in the making of a thermionic valve, as well as associated manufacturing equipment. Note that throughout this article the term “lampe” is used for low power devices (valves for radio receivers) while the term “tube” is used in higher power applications (transmission, radar…).

The HAM page :
L'émetteur télégraphique d’alerte TAL6
Les radioamateurs s’intéressent aux équipements radio militaires pour leur aspect historique et pour ceux qui bricolent encore, non pour les cannibaliser, mais pour les faire revivre sans les modifier en les utilisant sur les bandes amateurs. L’intérêt pour ce matériel réside dans sa difficulté d’exploitation, comme s’il s’agissait d’une sorte de réaction vis-à-vis de la sophistication du matériel commercial actuel.

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