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Contents de Radiofil magazine 45
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Ivory sheets :
Boîte de jeu Gégé Radio

Restoration :
Les portables américains Emerson et RCA Victor by J-P. Papet.
Last year, during the weekend of July 24th and 25th, a special call sign, TM3FFI, has been used by the Radio Club of Tullins (Isère), F6KJJ, in order to pay tribute on the secret radios of the Resistance of Vercors. During that time, the radio hams had the opportunity to operate old Second World War gears. We were also admiring small commercial portable receivers with miniature vacuum tubes, which were employed by the Resistance to listen to the BBC radio and the news from the world on medium waves as well. These receivers, as the Emerson 432 and the RCA Victor BP-10, were made at the beginning of the 40s.

Realization :
Un récepteur à ondes courtes by D. Maignan.
1re partie
This superheterodyne receives the short waves from 3.9 to 14.5 MHz. The three RF coils are pluggable, thus allowing to change easily the frequency range. All the wiring should be soldered with care and RF short length connections should be done whenever necessary.
A transistor tester by G. Chevaillier.
You have a doubt about the functionnality of a bipolar transistor and you have no means to check it! Well, the tester that I suggest you to build will answer your need. As you will notice, the construction of this small device is quite simple. Besides, its cunning but simple principle will surprise you.

Trick :
Analyseur de lampes Métrix U61C by J-C. Montagné.

Memory :
Les boîtes Gégé by D. Maignan, T. Luzy.
Comment les jeunes deviennent passionnés de radio? by G. Biraud.

In the course of Web :
Au fil du forum by D. Maignan.
Récepteur horaire 162 kHz
As everybody already knows, the Radiofil forum initiated by Radiofil for all the amateurs of early radio and audio techniques, is a great place of courteous chats where participants from all countries are exchanging information about their common hobby which are always interesting. We are choosing and reproducing some files that are supposed to be of great interest to our readers, especially for those not ready to use the web yet. In this issue, we have picked out the description of a 162 kHz receiver intended to receive the modulation of France Inter and also to synchronize a vintage 20th-century clock on the frequency of the transmitter carrier. The author makes a very detailed description of this enriching realization…

Retro audio :
Soyez ludique : construisez un ampli hi-fi by M. Deluz.
Part 11 : the inverted automatic bias
Before describing the inverted automatic bias, we first remind the different bias methods used in the audio power amplifiers.

Theory and practice :
Retour sur les postes à cristal by G. Grand, G. Prieur.
I wondered why the energy provided from only one alternance is detected in a crystal radio set, while two are available, moreover only one is damped, the other isn’t. At first, I turned to a germanium diode bridge with OA85, 1N34 or equivalents, but this configuration increased the detection threshold and so reduced the sensibility, because the signals have to cross two diodes at each alternance.

Atelier :
À propos des haut-parleurs by D. Maignan.
The loudspeaker is the last link of the receiver chain, the interface transducer, as we say today, the purpose of which is to convert the electrical energy into acoustic energy.
Comment transformer un Rx en Tx by J-P. Cipierre,E. Fréchet.
Have you never dreamt to imitate a radio speaker, by making listen to your voice from the loudspeaker of the home radio receiver? This original conversion was described by E. S. Frechet in the magazine Radio Constructeur No. 72 published in october 1951. J.-P. Cipierre presented at the last exhibition of Charvieu-Chava­gneux a modified radio set of the fifties which allows him, thanks to a cunning set of switches, to turn instantaneously the original receiver into a transmitter, as described by the author. Towards the visible simplicity of this transformation, this article is going to tempt you to undertake the job on an old chassis left in a corner of your lab.

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