schneider: 7; Fidelio

Bonjour,

Pour la 2e fois je rencontre une radio avec une grosse bobine d' antenne comme la Scheider Fidelio. Vu de ses dimensions je pense que la bobine est une sorte d' antenne.

Où trouver plus d' informations?

Cordialement,

 

Eduard Hontele

 

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Bonjour Eduard,

C'est un «cadre à air» pour PO et GO et assez commune dans les radios françaises des anées 50.

Un court article peut être trouvé ici.

Cordialement,
Mark

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Bonjour Mark,

 

Merci pour votre pompte réponse.  Je ne possède pas ce radio mais si je me rapelle bien, il se trouve encore quelque chose à l'interieur de ce grand tambour. D' autres bobines?

Mes excuses pour les fautes linguistiques, le français n' est pas ma langue maternelle.

Comme auteur d' une magazine radio (en néerlandais), je cherche toujours des objets intéressants pour écrire un article. Deux questions me restent:

- trouver plus d' informations au sujet de cette antenne;

- cette forme d' antenne se ne voit pas en Belgique. Pourqoui? Question de brevets? Influence de Philips ou de l' Allemagne? Les nouveaux ferites qui permettent de construire des antennes plus petites?

 

Cordialement,

 

Eduard Hontele

 

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Good evening Edouard,

there is little I can tell you about this form of antenna.

Without any conclusions drawn, we know from "Radios von gestern" (E.Erb) that the orientable ferrite antenna was patented already in 1935 by Lorenz (mentioned in the text).

In Germany, France and the Netherlands, the ferrite antenna came into regular use as late as ca. 1952. In France, they were called Ferrocapteur, or Ferroxcube, apparently (unconfirmed) a "development" by La Radiotechnique (Philips). I have come across the name "Siferrite" in contemporary brochures - this seems to indicate the type of material used more than anything else. In Germany, Siferrite was a registered trademark.

The "cadre à air", "cadre à air blindé" or simpler, "cadre antiparasites" can be found earlier already, but I cannot give you any precise data about that.

Your assumption is correct, those have two (usually orientable) coils, one for PO, one for GO. Michael Watterson has written an article about the Schneider Romance, down at the bottom you will find a better picture, and some remarks about the functionality.

In conclusion, I suspect the following reasons for the continued existance of those cadres:

• customers might have been used to them as an indicator for quality
• patent / license fees might have slowed the use of the technology
• the shielding quality might have been better

Since I'm not very versed in technical aspects, I cannot make any technically sound assertions about them, sorry. Hope that helps either way.

Kind regards,
Mark

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Good morning Mark,

I agree with all the items You wrote about this antenne.

In between I received more information from a French amateur. I was wrong to see the great exterior coil as an antenna. Both ends of that giant coil are joined together and connected to ground. The exterior windings are a chield against the electrial component of the radio waves. Indoors the E component carries a lot of home  made noise. Inside the giant coil there are orientable coils. The coils are moved by a knob and act as loop antennas. The H component of the wave induces a voltage in the magnetic loop coil. That kind of antennas have the typical 8 formed direction patern. Noise comming from another direction than that of the desired transmitter can be filtered away.

The system looks a bit like a ferrite antenna. It misses the high µ of the ferrite rod. To reach te same sensitivity, the surface of the coil must be much larger compared to a ferrite antenna. Thats why that radiopart is so big.

Cordialy,

 

Eduard

 

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