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The above attachment is well worth downloading and reading. It covers much more that RF chokes. It includes capacitor selection, proto board construction for RF circuits and how to distribute and filter power around a board and circuit.
It is good Thanks. The reason I'm posting this it is because we have
a RF choke on a machine that it is really old and we don't find
any replacement. I have never worked with an a RF choke before and I don't have any expertise on it. The RF choke it is supposely to be a Ohmite Z-30. But I don't find the specificatios of it, Like inductance, DC current etc. What can I say it have 83 turn with a magnet wire with a Ceramic core. The Diameter of the ceramic is 1.17 inches (29.718mm)
and an internal diameter of 0.756 inches (1.92024mm). The length of the wire spreading thru the ceramic core is 6.75 inches (171.45mm). Does any body knows how to calculate the inductance witout any instrument. Formula etc.
I see the problem you are facing. WIthout knowing the µ of the material it is almost impossible to know the inductor value. Sometimes in reverse engineering the inductor value is measured and then based on the core size the µ is esitimated and subsequently the current handing of the core is predicted. The wire diameter will give you an estimate of the DC resistance.
Try to measure the inductor value using any low frequency equipment and the rest can be easy. You can look at Amidon Inductive components in the WEB, they have lots of basic material to calculate the inductor.
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