...now the coil is completed, see attachment.

Some first measurements:
Diameter:  0.3 m.
R (DC): 17 Ohm.
Inductivity (measured at ~ 1 kHz): 1.62 mH
Self resonance: 734 kHz

So far so good...

73, Stefan

Am 23.10.2018 15:13, schrieb DK7FC:

...now i started to build one, see attachment.

Not yet sure how it will perform. DON'T bother me with calculations telling it won't work! ;-)

73, Stefan

Am 22.10.2018 15:04, schrieb DK7FC:

Hi all,

Has someone ever build (homemade, not bought!) a Rogowski-coil for RF current measurements?

https://en.wikipedia.org/wiki/Rogowski_coil

It could be used to measure leakage currents in a tower near the antenna wire for example. Or for measuring RF currents into a pole of a guide rail, for example :-)

I'm planning to build one and i thought i use 0.4 mm diameter enameled cu wire arround a graden hose, having 0.6m circumference. Then some shrinking tube will be applied. That's the plan.

The circuit looks easy, it should be run from a 9V battery and a simple TL081 for example. The output could be adapted to a multimeter, so there is a digital read-out.

I'm curious to see how it works...


73, Stefan

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