Amazing work Stefan !! :-O
I bet you have constructed some kind of support (like a lathe) which lets you rotate the pipe easily and wound the coils . Right ?
This is getting really heavy and the quality of coils looks very nice and repeteable ...... at least five times ! ;-)
Dumb question: Why do you get different inductance values when resonating it with antenna equivalent capacitor and when measuring current at 273V AC / 50Hz
??
Shouldn't be inductance a constant value ? ...... or I'm missing something obvious :(
Good luck with the 6th floor. Seems that there is no room for a 7th, so that's why you mentioned the variometer
Hi ULF,
It's just a few weeks ago, now the 5th stack is wound on the coil: https://dl.dropboxusercontent.com/u/19882028/ULF/20161026_185804.jpg
The DC resistance rose from 445 Ohm to 572 Ohm.
The measured resonance frequency (using the antenna equivalent C in the shack) dropped from 3.667 kHz down to
3.208 kHz. That should be about 4.92 H.
Measured at 273V AC / 50 Hz, i'm getting 197 mA, so the actual inductance is 4.0 H.
A 6th stack and a variometer part is needed!
73, Stefan
