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Contents de Radiofil magazine 64
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Ivory sheets :
Poste à deux lampes à réaction 1925

Restoration :
Restauration d'un poste valise LGM de 1927 by G. Mezonniaud.
A while ago I found this battery set at a nearby second hand market. It was in a sorry state as you can see from the photos. Due to the extent of the damage I put off tackling its restoration for quite a while. What finally decided me was that, although in poor condition, there were no parts missing (but it must have been in a damp place for a long time).

Measurement :
Consommation sur les ports USB by J-C. Montagné.
Un appareil simple et utile
Cette description pourra se révéler très utile à tout possesseur d’ordinateur désireux de connaître la consommation d’un périphérique connecté à un port USB de son PC.

Trick :
Le Recyclodyne by J-R. Malderez.
Salvaged material is given a new lease of life here through the construction of a battery powered radio I designed and built myself. I wanted to take up the following challenge: as far as possible use material we come across every day and which is ultimately bound for the tip. I favour wood which is more and more considered as a choice material, even in the form of crates. Nowadays largely displaced by cardboard and plastics, it nevertheless maintains its reputation for being able to enhance its content, and is therefore highly attractive to the consumer with a preference for natural materials.

In the course of Web :
How to brush aluminium

Retro audio :
Mes débuts en hifi les amplificateurs à tubes by B. Périer.
1. Les amplificateurs à tubes
During my engineering studies in Paris — that must have been in 1963 — my classmate once whispered: “ I’d really like to find out what a transistor hi-fi would sound like ”. This remark set me thinking. Transistors, yes, I was familiar with these — I had one which I used to listen to “ Salut les Copains ” and “ Pour ceux qui aiment le jazz ” on Europe No 1 — but what might a true high-fidelity system consist of?

FM :
Frequency modulation by D. Maignan.
Part 4
We have already studied the general layout of an FM receiver in a previous article. Let’s now look at the design of input stages which amplify the signal coming from the antenna, and then frequency converters, whilst also tracking their technical evolution. Together these three stages, input amplifier, frequency converter and local oscillator, form what is commonly referred to as the FM tuner.

Introductory courses :
Caractéristiques de l'atmosphère terrestre
L’atmosphère terrestre dans laquelle se propagent nos chères ondes radioélectriques est formée d’un mélange de plusieurs gaz et d’une quantité variable de vapeur d’eau. Cette composition n'est pas constante à une altitude donnée.

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