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Using of ferrite rods in vlf antennas

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adnan012

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hi,

what is the purpose of using ferrite rods in vlf antennas? Is there any calculation required for designing such an antenna?
 

Ferrite rods offer the small size and a good directivity. In basic textbooks you can learn the details
 
Thanks for reply.
Can you suggest any text book for this topic?
 

Because of the effect of the powder iron/ferrite core, the inductance is increased by a large factor , meaning that less turns can be used to achieve the same inductance. though for maximum Q only air cored coils can be used.
Frank
 
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