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1. Re: [TowerTalk] Behringer RFI (score: 1): Author: <john@kk9a.com>; Date: Thu, 19 Oct 2006 19:32:08 -0400; The site just links to paint products. I'm not sure what this has to do with towers or HF antennas. John KK9A Hmmmmm..... I just stumbled across Behringer recently on the web... they have a good look; /archives//html/RFI/2006-10/msg00031.html (7,340 bytes)
2. Re: [RFI] DigiKeyer II (score: 1): Author: john@kk9a.com; Date: Thu, 19 Dec 2013 09:24:43 -0500; I own two DigiKeyer II's and a DigiKeyer and they work well on CW and RTTY. This product is designed for digital modes, I have no idea how you are using on SSB. You should have purchased a MicroKeyer; /archives//html/RFI/2013-12/msg00097.html (9,769 bytes)
3. Re: [RFI] DigiKeyer II (score: 1): Author: john@kk9a.com; Date: Thu, 19 Dec 2013 10:18:09 -0500; Actually I have used a DigiKeyer on SSB from P40A, but only to interface the radio's frequency data to my laptop. The device works fine as a COM to USB converter for band data. The mic was connected; /archives//html/RFI/2013-12/msg00099.html (11,105 bytes)
4. Re: [RFI] DigiKeyer II (score: 1): Author: john@kk9a.com; Date: Fri, 3 Jan 2014 09:41:15 -0500; Sorry to hear of your problems, I have used the DigiKeyer and DigiKeyerII with no grounding or toroids from home and on expeditions with no noticeable RFI issues. I did have one come with an intermit; /archives//html/RFI/2014-01/msg00007.html (8,345 bytes)
5. Re: [RFI] Broadcast station RFI Mixing - RESOLVED (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Thu, 29 May 2014 06:23:44 -0500; I had a very similar situation when I had my 160' tower loaded with ring rotators near Chicago. It had a homebrew 80m rotating dipole on top and I heard a mix of local broadcast stations on this band; /archives//html/RFI/2014-05/msg00089.html (11,760 bytes)
6. Re: [RFI] RF getting into 4-port wirelss router (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Mon, 12 Jan 2015 11:11:25 -0600; A 55' vertical is not resonant on 40m. How are you matching it? Do you have a choke on the coax at the antenna? John KK9A 6) I am also, now, very suspicious of the ground system in the shack. I'll re; /archives//html/RFI/2015-01/msg00075.html (7,333 bytes)
7. Re: [RFI] RFI Broadcast Station Mixing in Crank-Up tower? (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Fri, 30 Oct 2015 17:29:28 -0400; I had a similar problem with a 80m rotating dipole on a 160' Rohn 65G tower when I lived in the Chicago area, although mine was pretty consistent. Moving it 650 miles away solved my problem. John KK9; /archives//html/RFI/2015-10/msg00063.html (8,371 bytes)
8. Re: [RFI] RFI from Samsung Fridge (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Mon, 30 Nov 2015 12:17:21 -0500; I purchased a very similar Samsung model from Lowes earlier this year and I love it. I have not noticed any RFI however my antennas are hundreds of feet away from the house. John KK9A The XYL has bee; /archives//html/RFI/2015-11/msg00023.html (7,416 bytes)
9. Re: [RFI] Samsung refrigerator (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Mon, 30 Nov 2015 16:49:58 -0500; Unplugging the refrigerator for a 48 hour contest would not make my XYL very happy and I would certainly miss the cold beer afterwards. John KK9A Not sure if it was my review or not, but our 2011 Sam; /archives//html/RFI/2015-11/msg00025.html (7,818 bytes)
10. Re: [RFI] RF quiet HVAC (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Wed, 2 Dec 2015 12:25:48 -0500; You need to be in a warmer climate for heat pumps to work efficiently. I have several units and my main floor one also has a propane furnace that takes over when it is less than 30 degrees outside. I; /archives//html/RFI/2015-12/msg00027.html (8,607 bytes)
11. Re: [RFI] RF quiet HVAC (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Wed, 2 Dec 2015 18:39:16 -0500; I am in North Carolina and a heat pump here looks like an air conditioner. I was not thinking about the expensive geothermal heat pump when I made my comments. John KK9A What about heat pumps that us; /archives//html/RFI/2015-12/msg00034.html (8,048 bytes)
12. Re: [RFI] Laser Christmas Lights (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Fri, 4 Dec 2015 17:14:53 -0500; What happens if Ed finds the product to be outside FCC limits? Are there fines or anything in place to persuade manufactures to be complaint? John KK9A Hi ED. Hope the leads help, Glad you are on top; /archives//html/RFI/2015-12/msg00045.html (8,659 bytes)
13. [RFI] Tescun PL-660 Antenna (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Tue, 19 Apr 2016 11:10:26 -0400; I have a constant noise source that is loud on 10m and 15m. I got a beam heading and then I walked along the main road where the power lines are with my Tescun PL-660. I listened on 10m using the bui; /archives//html/RFI/2016-04/msg00041.html (7,497 bytes)
14. [RFI] Snap-on Ferrites (score: 1): Author: <john@kk9a.com>; Date: Sun, 18 Jun 2017 22:44:29 -0400; I was reading the recent QST article RF Mayhem by WB8IMY. The author said to avoid using snap-on ferrites for problems caused by HF signals as they rarely work well at HF. It is best to stick with ci; /archives//html/RFI/2017-06/msg00032.html (6,346 bytes)
15. Re: [TowerTalk] Snap-on Ferrites (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Mon, 19 Jun 2017 10:05:56 -0400; A lot of the examples on K9YC's site show snap-on ferrites. Also the part numbers for some snap-on models are shown in your "Ferrites useful to hams for suppression and chokes" list. Of course we kno; /archives//html/RFI/2017-06/msg00040.html (7,517 bytes)
16. Re: [RFI] Smoke Detectors Beeping (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Sat, 28 Jul 2018 09:43:15 -0400; It is likely that the majority of the problem is feedline radiation. I would work on that first. What performance advantage does an OCF have over a center fed 1/2 dipole or multiple dipoles in a fan?; /archives//html/RFI/2018-07/msg00136.html (8,207 bytes)
17. Re: [RFI] Smoke Detectors Beeping (score: 1): Author: <john@kk9a.com>; Date: Sat, 28 Jul 2018 12:56:40 -0400; The original poster did not say if it is a wired, multiple wired linked detectors or a battery unit but I am guessing that it is not a battery type. Trying a different brand may be interesting. John; /archives//html/RFI/2018-07/msg00138.html (7,812 bytes)
18. Re: [RFI] Common mode choke on 4 Square feedlines without skewing phasing? (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Thu, 24 Jan 2019 08:38:53 -0500; I use RG302/U for 75 ohm chokes. John KK9A Thanks Grant. In a quick search, I found RG179 on Pasternak's website, but didn't see a relevant power rating at HF. Looking at Belden's datasheet, VF is 0.; /archives//html/RFI/2019-01/msg00035.html (9,301 bytes)
19. Re: [RFI] Please comment this picture (score: 1): Author: <john@kk9a.com>; Date: Tue, 3 Jan 2023 22:49:32 -0500; What is your feedline? John KK9A Jim, I have measured (Icom 7300) reduction of nearly 11 dB of noise pickup from local sources by installing a bifilar wound common mode choke in the shack to transiti; /archives//html/RFI/2023-01/msg00020.html (6,455 bytes)
20. [RFI] re Solar plant interference (score: 1): Author: <john@kk9a.com>; Date: Mon, 6 Mar 2023 20:15:19 -0500; What island? I would try to operate as far away as possible from this solar array as I would except RFI from it. It is definitely becoming harder and harder to find a semi-quiet location. John ex VP2; /archives//html/RFI/2023-03/msg00013.html (6,597 bytes)

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