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21. Re: [RFI] Rheem AC RFI (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Sat, 5 Sep 2020 14:41:24 -0400; David: Thank you for the reply. My spectrum analyzer is a Tektronix 7L12. Although the lower Frequency limit is DC, it is difficult to resolve meaningful signals At very low frequencies due to the Ze; /archives//html/RFI/2020-09/msg00023.html (9,381 bytes)
22. Re: [RFI] Rheem AC RFI (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Sat, 5 Sep 2020 18:38:32 -0400; I know that. I have a lot of experience with these things. 50 year career in this type of design. Lumped constant filters are not Missing, just seem to not be that effective in knocking down very LAR; /archives//html/RFI/2020-09/msg00026.html (13,008 bytes)
23. [RFI] Rheem (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Sun, 6 Sep 2020 11:52:45 -0400; Thanks to all the responders. I am familiar with all of the possible issues regarding common mode, differential mode, coupling of high current PWM to control wiring, etc. This issue in general is at; /archives//html/RFI/2020-09/msg00029.html (7,902 bytes)
24. [RFI] Rheem HVAC RFI Link to document (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Tue, 8 Sep 2020 13:49:28 -0400; Hello again group: I created a power point document outlining some of the measurements I've taken with regard to the RFI source from the new Rheem HVAC heat pump system recently installed. I've been; /archives//html/RFI/2020-09/msg00031.html (7,326 bytes)
25. Re: [RFI] Rheem HVAC RFI Link to document (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Tue, 8 Sep 2020 19:57:55 -0400; David: The zero span pictures are exactly what exists as RF signals from the switcher at a center frequency of 6.4 MHz. That is where the spectrum analyzer is tuned. The timing between each pulse is; /archives//html/RFI/2020-09/msg00033.html (11,520 bytes)
26. [RFI] Request For Comment (2nd Post) (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Tue, 27 Oct 2020 09:44:41 -0400; Hello Group: This is second try to post. First one never showed on list(sent on 10/21). I've posted in the past about RFI from a new RHEEM A/C system. I am posting two links to Google Drive, which ar; /archives//html/RFI/2020-10/msg00066.html (7,907 bytes)
27. Re: [RFI] Request For Comment (2nd Post) (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Tue, 27 Oct 2020 19:28:24 -0400; I received a reply from Don Kirk, WD8DSB and Dave Eckhardt W0LEV. First off a big thank you for both replies. I do have a commercial Power line filter, which I did not mention in the Power Point docu; /archives//html/RFI/2020-10/msg00070.html (16,546 bytes)
28. Re: [RFI] Request For Comment (2nd Post) (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Wed, 28 Oct 2020 13:05:28 -0400; Thank you David. Will keep these issues in mind. Karin _____ From: David Eckhardt [mailto:davearea51a@gmail.com] Sent: Wednesday, October 28, 2020 12:57 PM To: Karin Johnson Cc: Don Kirk; Rfi List Su; /archives//html/RFI/2020-10/msg00072.html (18,183 bytes)
29. Re: [RFI] Request for Comment (Rheem RP1748 A/C System) (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Thu, 5 Nov 2020 17:18:40 -0500; Hello Group: Just a quick update on the RFI created by my new Rheem central A/C system. The installer was out earlier this week to replace the UNSHIELDED thermostat wiring with SHIELDED wiring. They; /archives//html/RFI/2020-11/msg00008.html (8,040 bytes)
30. [RFI] Off Topic Request for help Balun (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Mon, 16 Nov 2020 11:07:49 -0500; Hello Group: I know this is off topic. This list is the only list I subscribe to, because I've had issues with "phishing emails" when subscribing to the Tower Talk list. So My Request for help. I hav; /archives//html/RFI/2020-11/msg00039.html (7,417 bytes)
31. [RFI] Balun help (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Wed, 18 Nov 2020 17:25:26 -0500; Thank you to all that have replied with help and pictures. I have the balun repaired and it is working all OK. Karin Anne Johnson K3UU Palm Harbor. FL _______________________________________________; /archives//html/RFI/2020-11/msg00043.html (6,206 bytes)
32. [RFI] Request for comments, Rheem HVAC (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Sun, 3 Oct 2021 12:58:42 -0400; Hello fellow RFI'ers: Some time ago (probably over a year ago)I posted about RFI/EMI from a Rheem HVAC unit, Model RP1748AJVCA. I've been very busy with other projects. Life gets in the way sometimes; /archives//html/RFI/2021-10/msg00009.html (9,780 bytes)
33. Re: [RFI] Request for comments, Rheem HVAC (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Sun, 3 Oct 2021 14:55:13 -0400; Thank you Dave, Exactly what I hoping. The inverter board and its associated electronics is quite sophisticated, I have an energy monitoring system on my home, made by SENSE. I have a current transfo; /archives//html/RFI/2021-10/msg00011.html (13,758 bytes)
34. [RFI] HVAC - some observations (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Mon, 25 Jul 2022 12:30:37 -0400; Hello Group: Given the recent discussion about HVAC systems and RFI, I am writing this to chime in on an issue that I haven't seen on this reflector. I have had a brief discussion with another ham th; /archives//html/RFI/2022-07/msg00058.html (8,948 bytes)

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