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Contents of the magazine
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Contents de Radiofil magazine 69
<< Previous July-August 2015 Next >>
Couverture magazine

Ivory sheets :
Hardy deux lampes by Sylvain Melot.

Letters of radiofillists :
Courrier des radiofilistes

Restoration :
Le transistor Reela by Jean Gadreau.
Once we are known as collectors, our friends are happy to gift us “ rare objects ”. This is how a certain number of items are put aside and pile up. These end up filling the garage, cupboards, … and the wife, understandably, objects to these places becoming a shambles. A decision therefore has to be taken : the tip or mustering up the energy for a period of restoration. The poor condition of this Reela didn’t inspire me much. On the other hand I was keen to evaluate the performance of its two shortwave bands. In the end it escaped its ultimate fate : the scrapheap. After spending 9 years in a plastic bag at the bottom of a cupboard, it found a new lease of life !

Realization :
Tx à la noix by Alain Caupène.
Cet hiver il y a eu des noix de grosse taille, à un point tel que l’on n’avait pas envie de jeter les coquilles, surtout si on avait bien pris le soin de les séparer soigneusement en deux ! Mais ensuite qu’en faire ?

In the course of Web :
Construire un petit poste avec une diode 1N34
As most of you know, the Radiofil forum which is available to all vintage radio and audio enthusiasts, is a hub of good natured discussion and exchange and therefore always 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 discussion centres around small germanium diode radios.

History of techniques :
La stéréophonie by Daniel Maignan.
Following the example of 3D photos, devices of varying complexity for the development of sound were explored. The contrast of images gives a certain impression of 3D, but never quite achieves the true optical 3D effect that only binocular vision can bring. Diffe­rent systems allow us to address this shortcoming, in particular the well known stereoscopic method, where two images are obtained via two separate lenses offset by the distance between the eyes. But up to then radiophonic transmission was achieved by means of a single microphone in the studio, and our receiver had only a single audio channel…
L’enregistrement magnétique by André Remond.
2. Vers la bande magnétique et le magnétophone
This article provides a resume of the evolution of magnetic recording, from its invention by Poulsen up to the present day. The Marconi-Stille type 2 did sterling service with the BBC who needed them to broadcast its programmes to the Commonwealth countries, notably for Australia and Canada, at different times from those in the UK. But the sound reproduction quality was still inferior to that of disc, with extremely heavy equipment and a steel ribbon, as well as wire, which were difficult to use.

The HAM page :
Un récepteur VHF monolampe by Thierry Roberjot.
Technical evolution over the past decades has made us forget the slightly magical side of some phenomena in physics. Here is the description of a super-reaction design which will bring back some good memories to the « old timers » and will surely appeal to the inquisitive who never knew the valve era.

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