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Contents of the magazine
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Contents de Radiofil magazine 97
<< Previous March-April 2020 Next >>
Couverture magazine

Ivory sheets :
Poste Kadette International

Restoration :
Tom Thumb Camera Radio Tout-en-un by Jean-Pierre Tonnelier.
A collector friend recently asked me to repair a 1948 battery portable radio, the ‘petit Poucet’ or ‘Tom Thumb’ (Tom Pouce), which consisted of a portable Wireless set combined with a photographic film camera, a feature I had never seen before.

Technical pages :
Amélioration des condensateurs et des bobines sur les postes de TSF des années trente by Radiofriend.

Realization :
Les débuts de la radio reconstitués by Renaud Jean-Marc.
A while back I was asked to write a little article on these unique designs for a spark transmitter and a receiver with Branly coherer, both of basic construction and somewhat novel. What’s most interesting is the unique method of construction, since certain parts were never originally meant for technical applications. I’m going to describe the innovative spark transmitter and receiver with iron filing coherer (otherwise called a detector), as M. Branly would have wished. Of course my coherer is not nearly as good as the superb reproduction, also functional, of Jacques Hildebert, described in the September and October 2017 editions of Radiofil magazine.
Rejoignez le monde de l’Arduino en construisant un générateur HF/BF by Daniel Maignan.
Our hobby uses ancient techniques and technologies which are totally out of date. However we do also make use of more modern electronics - information technology in particular, which helps us in more ways than one. This is the case not just in our day to day life but also in the pursuit of our hobby, with the internet, digital radio links (wifi, bluetooth), skype, word processing, stock management of valves, circuit diagram tools, printed circuits, reproduction of dials using Photoshop, etc. The Arduino project appeared in the early 2000’s. Today it’s a brand which encompasses a series of circuit boards equipped with a microcontroller which can be programmed to perform a wide range of tasks (home automation, control of robots, embedded computing, etc). This well conceived platform is based on a simple input/ output interface, originally aimed at interactive multimedia programming for live performances and artistic shows, but which has now been adopted by enthusiasts all over the world because it enables a direct and interactive linkage with the equipment. Arduino programming implements freely accessible open source software, to which anyone can contribute by adapting, improving or even creating new material. The aim of this article is not to learn programming, but instead to give you a succinct overview of Arduino, and then to apply it using existing software in projects to help equip your workshop (at minimal cost) with modern, accurate gear for troubleshooting of your Wireless sets. The objective of this project is to make an LF/ HF signal generator, through linkage to programmable digital oscillator. Then, equipped with an agile, high resolution signal with the stability of a quartz oscillator and able to accept a high level of amplitude modulation, we will be able to build (with the addition of a small linear amplifier) a LW/ MW (perhaps even SW) transmitter. No doubt some Radiofilists will be a bit thrown off by this technology they are discovering. I would like to assure them that they will be able to count on our willing support for the successful completion of their project. My aim was to keep this article quite high-level. In addition, I preferred to publish the section containing the numerous screen shots necessary for the understanding of Ardinuo only on the Radiofil (or my own) website, accessible to all readers.
Un poste superhétérodyne à batteries de fabrication maison by Gabriel Rouiller.
Shown below are photos of this superhet receiver which I have chosen to build in a cabinet, rather than on a wooden board, as you used to see in old magazines, to make a demonstration set, since this setup seemed to me to be more suited for display and training.

In the course of Web :
Au fil du forum by Serge Logez.
Colle conductrice
Comme la plupart d’entre vous le savent, le forum de Radiofil, qui est mis à la disposition de tous les amateurs de techniques radio et sonores anciennes, est un haut lieu d’expression et d’échanges courtois et par conséquent une source d’informations toujours très intéressantes, avec la présence régulière de participants étrangers. Nous sélectionnons des sujets que nous estimons être d’un grand intérêt pour nos lecteurs et nous les rapportons dans les lignes de la revue, en pensant en particulier à ceux qui n’ont pas Internet. Dans ce numéro, il est question de colle conductrice.

History of men :
En mars 1932, décédait le grand savant Gustave Ferrié

History of techniques :
IBM632 by Patrick Binon.
Just over forty five years ago, whilst on a visit to my preferred supplier (ie local scrap dealer), I found myself in front of an imposing machine whose logo grabbed my attention : IBM. It had just been dropped off with all its accessories and the crane driver was about to load it into the crusher. I indicated that I was interested in this item and, since he knew me, he moved to work a bit further along. It was in good condition and corresponded with the photo on Wiki but with even more accessories, this must have been at least a Model III (costing $10,000 !).

Atelier :
Un adaptateur pour tester les tubes européens sur Métrix U61 by Gérard Fuchs.
Following the article in Radiofil magazine No 84 decribing the testing of European valves, I have made an adapter through an external modification to this Metrix U61.

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