French is not my language in any means. I have been able to surmise the following but no place I could find the Resistance or Inductance of the coils. It seems it was sold as a Kit and this is only the Constructions Document.
It gives you the Dementions. 190mm long inside
100mm wide inside
7mm bunch wound coil
5mm tall bunch wound coil
.5mm wire
TX Freq of 9Khz Note Tx is a Driven Coil not Tuned Oscillator.
Rx Freq of 8.5Khz Tuned L/c circuit 110nF Using a LC calculator It shows 3.19mH to obtain the 8.5Khz.
Tx and Rx Coils 180 out of phase
That at hand you could use a Coil Calculator to determine the winding I would think. Issue is there is not any DD or Semi Circle Calculators that I know of. You could just use a Circular Coil Calculator of your DD Coils reformed as a Circle but when reshaped to the Half circle Inductance will be higher lowering the Frequency. Your best bet is to just do winding of coil and measure as you go with a inductance meter.
In All Truthfulness if I was you I would abandon this project and build say the TGSL. A better detector with ALL DOCUMENTATION at hand.
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