Quote:
Originally Posted by jack
tank you very much j-p
Total to you Can I modify the receiver to detect metals that wm6 remote use?
The circuit itself is able to detect small metal on earth?(with ferrit coil)
you believe a frequency of 60 kHz to 120 kHz can be set to find a suitable metal?
The receiver with ferrite antenna you can make clear whether the metal in the radial (What size is the smallest possible metal)?
Best wishes for you dear j-p
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No the circuit by itself with ferrite coil cannot detect small metal on the earth.
In order to detect small metal you must also have a transmission of the frequency which you are tuned to, and you must hold the ferrite close to the small metal.
If there is a VLF transmitter sending a radio signal which you can tune to, then if you are lucky, maybe you can locate large buried things from more than 1 meter with this receiver circuit and ferrite.
Geologists can locate large buried things with a similar receiver when there is a VLF transmitter located 300 miles distance or less.
If there is no transmitter sending radio waves for them to receive, then they must set their own VLF transmitter to send a signal for their receiver to receive.
They usually put a very large loop of cable on the ground to transmit their VLF signal, then they walk inside of the loop to look for things buried.
These geologists do not find small metal things, only large things like rock formations, and sometimes large buried metal tanks and other large metal things.
They use large air loops maybe the same size as a large metal detector coil to find large things.
But experimenters use ferrites to keep the searching receiver coil smaller and to search for smaller things.
The experimenters also use higher frequencies than geologists so they can find smaller things.
Experimenters do not use 5 KHz to 30 KHz which geologists use. They use higher 60-120 KHz.
Nobody can say what is the smallest size metal you can find.
The only way to know how small metal things you can find is to built the receiver and tune to a frequency where you can receive a vLF transmission.
Then test to see if you can find large things or small things.
If you can find large things, then keep looking until you find smaller things.
After enough practice you will know what is the smallest thing you can find.
Some people say you cannot find anything with a VLF receiver.
But I think you can because I see publications from Geologists who find things buried when using a VLF receiver tuned to a VLF broadcast.
Best wishes,
J_P