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1. [RFI] Common Mode Choke Materials (score: 1): Author: Tony <73guddx@gmail.com>; Date: Mon, 5 Apr 2021 16:30:43 -0400; All: I'm looking for mix 75 cores to build a common mode choke similar to the one Paul, W1VLF shows in this video. https://www.youtube.com/watch?v=dcXq6u64HXg The plots show the choke to be very effe; /archives//html/RFI/2021-04/msg00018.html (7,423 bytes)
2. Re: [RFI] Common Mode Choke Materials (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 5 Apr 2021 13:39:38 -0700; My work on this is here. I've not looked at 2200m. http://k9yc.com/630MTXChokes.pdf http://k9yc.com/RXChokesTransformers.pdf 73, Jim K9YC _______________________________________________ RFI mailing l; /archives//html/RFI/2021-04/msg00019.html (7,104 bytes)
3. Re: [RFI] Common Mode Choke Materials (score: 1): Author: Dan K2YWE <dan.k2ywe@gmail.com>; Date: Mon, 5 Apr 2021 17:28:01 -0400; Tony, This is a good explanation and guidance on the utilization of a toroid core's window area. You can use it to find the ID you need. https://www.mag-inc.com/Design/Design-Guides/Powder-Core-Calcu; /archives//html/RFI/2021-04/msg00020.html (8,131 bytes)
4. Re: [RFI] Common Mode Choke Materials (score: 1): Author: Tony <73guddx@gmail.com>; Date: Tue, 6 Apr 2021 22:15:04 -0400; All: Thanks for the info on LF/MF common mode chokes. Jim's (K9YC) cookbook is very informative. I did some preliminary testing on 160 and 80 meters with a couple of 2.4 inch mix31 cores I had on han; /archives//html/RFI/2021-04/msg00021.html (8,464 bytes)
5. Re: [RFI] Common Mode Choke Materials (score: 1): Author: "Lloyd - N9LB" <lloydberg@tds.net>; Date: Tue, 6 Apr 2021 21:21:56 -0500; For below 160m (472 KHz & 136 KHz), you need Mix-75 toroids or similar. Also, if you saw "a few dB" improvement in noise with the choke at the antenna - every dB counts, so put a second choke out the; /archives//html/RFI/2021-04/msg00022.html (8,824 bytes)
6. Re: [RFI] Common Mode Choke Materials (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 6 Apr 2021 22:32:35 -0700; My guess is that the bulk of the noise is coming from the PC connected to the SDR since the only things on in the shack were the PC and monitor. It certainly does suggest that the computer/SDR are a; /archives//html/RFI/2021-04/msg00023.html (10,315 bytes)

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