![]() The number of turns on the rods is impossible to predict without knowing the type of Ferrite and the value of any parallel capacitances. Given that the original is around 50 years old, it should be possible to make a more efficient version now but some physical factors may restrict it's minimum size. This could be a meter (analog or digital) or an acoustic output. The basic operation of a VLF receiver is to use tuned circuits at the desired frequency, then an amplifier to increase the signal level, followed by some sort of measurement system. Is it possible for you to post a picture of the unit to give us a better idea of what you are trying to emulate? I have to confess this isn't my field of expertise either but it sounds like you have a simple VLF receiver, I'm not sure why two ferrite rods are needed though unless they are mounted at 90 degrees to each other to avoid signal nulling. 24KHz isn't a particularly low frequency so the inductance of the antennas shouldn't need 'thousands' of turns of wire. ![]()
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