On 10/21/2021 6:51 PM, Fred wrote:
Jim, K9YC, has done a ton of research on ferrites for baluns and chokes. I think [email protected] will get you to his published results. If 6.6 uh/4 turns is correct, you might be able to figures out the ferrite mix from his data.
Unfortunately, 99.9% of stuff like this that falls in our lap are little of any value for RFI suppression. This looks like a component intended for use as an inductor in power circuits; without winding experimental chokes and carefully measuring them with a VERY well calibrated test instrument and specially designed test jig, we have no way of knowing anything about the part. I measured nearly 1,000 chokes wound on a material that I'd already determined was the best choice for use at HF.
Bottom line -- if you need to kill RFI, study the app notes on my website, buy the specific parts I recommend, and apply them as recommended to wiring on noise sources, or wiring on victim equipment.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
