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Contents of the magazine
Sommaire général
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Contents de Radiofil magazine 65
<< Previous November-December 2014 Next >>
Couverture magazine

Ivory sheets :
Muphy A104

Restoration :
Repairing a low frequency transformer of a C119 set by J. Mahieux.
Having recovered an old C119 set I decided I’d restore it. It’s not been easy to find the corresponding circuit diagram and I’ll have to put together honeycomb coils and build A409 substitutes.

Technical pages :
Frequency modulation by D. Maignan.
Part 5
Following the signal path, after the input section and the frequency converter comes, logically, the intermediate frequency amplifier. An FM tuner’s sensitivity and selectivity performance depend heavily on this part of the receiver.

Military radio :
The mythical Collins R-388A or 51J-4 by J-M. Mathieu.
The Collins Radio Company, created in 1933 by Arthur Collins, built radio equipment for specific customers such as the Antarctic expedition of Admiral Richard Byrd, radio amateurs, broadcasters etc. Interested, the US Navy commissioned the study of receivers of high reliability, stability and frequency accuracy. The 51J-1 and 51J-2 series were launched in 1949. The use of quartz assured uncompromising characteristics. Then from 1952 to 1955 came the renowned R-388 (or 51J-3) series. A further significant advance in selectivity came with the R-388A (51J-4) series in 1957. Following financial difficulties, Collins was bought in 1973 by Rockwell International, a telecomms specialist of the time. However, in 2001, the avionics division of Rockwell was renamed Rockwell Collins Inc, in tribute to A. Collins.

The HAM page :
Les ondes électromagnétiques

Atelier :
Build your dynamic analyzer by D. Astratof.
A « signal tracer » is a piece of equipment used to test an audio device from source (microphone, CD player, tuner, …) through to loudspeakers. On a radio set it can be used to detect the presence of the local oscillator, to make tuning adjustments, or in fact to follow the signal, demodulated or not, from the aerial through to detection.

Téléphony :
A telephone Marty 1910 by D. Adiro.
Whilst the telephone is not my biggest passion, I must admit that it’s easy to be tempted, whilst browsing at a car boot sale, by a potentially attractive object. That’s exactly what happened to me with this Marty 1910 mobile set. Not exactly in pristine condition when I bought it, but intact, which is the important thing. For the rest one can always manage to restore the various materials used : wood and metal. Telephony, it’s also sort of the grandmother of TSF ….. in addition, the techniques are easy enough to understand and you can also amuse yourself by making them work on today’s “wired” network. We should take advantage of this since it won’t last an awful lot longer !!! Certain radiofilistes are no doubt also enthusiasts of these attractive objects, well built, well finished ; that’s why my camera wasn’t far during the various steps of restoration…

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