We are trying to make a VLF geophysics device for our graduate project and we need two ferrite rod antennas (desired length is 6").
Searching on the internet, we have found two ferrite rod suppliers.
The first one:
2000u Monster Ferrite Rods
Length: 6 inch
Diameter: 0.845 inch
And the second one is a local supplier:
Length: 3.93 inch
Diameter: 0.314 inch
We do not have experience and knowledge about antennas and their materials. The guy in the local supplier said that you can butt splice the coils to get 150 mm length and that diameter only affects the number of wire turns.
Is the advice accurate? Can you explain why the price is so different? Might it be due to the material quality or something else?