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Contents de Radiofil magazine 81
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Ivory sheets :
Philips B4X23A

Letters of radiofillists :
CDR N°81

Restoration :
Le premier poste à transistors chez General Electric by Jean-Pierre Tonnelier.
During our AGM on 24 March 2012 at Saint-Fargeau, a very good friend of mine gave me a type 675 GE American “pocket” radio, with original leather case and earpiece in its pouch. It weighs 349 gram­mes and measures 80 x 140 x 35 mm. The plastic case was available in different colours, each bearing a different reference : 675 black, 676 ivory, 677 red, 678 green, etc.

Technical doc :
Le poste Barlow-Wadley XRC30 by Yves Antonini.
Interesting, since this set uses a rather unusual HF technique, rarely encountered. For a start, it’s placed between the signal receiver and a standard everyday radio. Covering 500 kHz to 30 MHz (no Long Wave), with AM/SSB/CW modes, it is primarily aimed at the more experienced listener (SWL) and Short Wave enthusiasts. I found this set, dusty but in apparently good condition, on Sunday 19th June 2011 in a flea market in Croix, close to Roubaix. From distant memory I was already aware of the appeal of this receiver, but the seller, no specialist, thought it quite ordinary ! He wanted 5 euros for it, but as on principle I always haggle, even for small amounts, I took it away for 4 euros. A real bargain !

In the course of Web :
Au sujet des lampemètres
In this edition, the discussion centres around valve testers and fabrication of the renowned adaptors (“camemberts”) which equipped certain Metrix models.

History of men :
Un grand savant oublié : Camille Tissot
On the occasion of the centenary of Camille Papin Tissot’s death, Radiofil magazine wanted to look back on the career of this great scientist, somewhat forgotten today.

History of techniques :
La transmission de l'heure by Jean-Luc Desgrez.
At the end of the 19th century, TSF (telegraphie sans fil – telegraphy without wires) takes off and sees its areas of application multiply; the transmission of time signals benefits from this progress to reach longer and longer distances. The following has been largely taken from a very old publication about the beginnings of TSF, we therefore have to take ourselves back to 1914.

Report :
Le centre émetteur de RMC à Roumoules by Daniel Werbrouck.
Première partie
Having worked for the technical department of RMC from 1975 to 1980 (it was still Radio Monte-Carlo then), I had the opportunity to spend a few days on assignment at the Roumoules broadcasting centre (inaugurated in 1974) in order to lead a series of tests and evaluation of the transmitted signal quality. Forty years later, not yet having lost my passion for broadcasting — and with a bit of nostalgia — I felt a strong urge to revisit this exceptional site whose future is probably at risk, but which for now remains the last Long Wave and Medium Wave broadcasting center still in operation (with modulation) on French soil and also one of the most powerful of its kind in the world. My ex-employee status helped obtain the authorisations necessary to research this article; the kindness and professionalism of the site manager, Pascal Penella, made it further possible.

Atelier :
Les bobinages en gabion by Jean Cudraz.
These coils were made on a support having an odd number of panel pins or nails arranged as for a spider web coil, but vertically. The windings are then sewn or firmly stuck around the edges. That way you get a very open coil of excellent quality which saw great success around 1930.

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