While the frequency is low, this is not ultra sonic.It's ultrasonic,
The frequency is ultrasonic, which was the point - that it's not VHF.While the frequency is low, this is not ultra sonic.
Sonic implies a pressure wave, like sound.
This is low frequency RF, ie an electromagnetic wave.
I read it as 'ferrite rod', and it's not too far off the bottom end of LW - if you put two LW coils on the same ferrite rod you should easily be able to tune down as low as 58KHz. Even adding extra capacitance to a single long wave coil should get it down there.However, I suspect that the OP is not going to transmit very far past the end of his workbench using a "ferrite core antenna" at 58kHz.
What is a ferrite core antenna?
Is that a ferrite rod antenna, or as I believe it is referred to in the USA a "loopstick" antenna.
As you well know, RF begins where ever you want to start using it (even audio type frequencies, or sub-audio) - the use of 'ultrasonic' was simply to signify easily where abouts in the spectrum it is.Can you explain at what frequency ultrasonic ends and radio begins?
The quick answer is yes.Will it change the properties depending on the wire diameter? and diameter of ferrite rod?
That is copper plumbing pipe!I have 10mm diameter copper wire