Search String: Display: Description: Sort:

Results:

References: [ +from:pchristensen@ieee.org: 21 ]

Total 21 documents matching your query.

1. [RFI] Fw: Comcast/Xfinity X1 service (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Thu, 25 Jun 2015 10:56:31 -0400
That's a near-quote from a telco's propaganda department, also known as marketing. Cable topology is truly a broadband service while ADSL/DSL is truly a baseband service. Compare performance with dis
/archives//html/RFI/2015-06/msg00032.html (8,912 bytes)

2. Re: [RFI] PC Speaker "Buzz" (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Tue, 30 Jun 2015 20:53:18 -0400
You've gotten good advice so far. If RFI ingress is occurring on the input to a PC *power-amp* speaker system, then probably the most effective and least invasive way to mitigate the common mode curr
/archives//html/RFI/2015-06/msg00039.html (8,128 bytes)

3. [RFI] Switch-Mode Noise Source Identified (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Fri, 6 Nov 2015 21:34:16 -0500
Last weekend, I noticed a high level of noise on the HF bands, especially 160m through 40m. The noise was classic switch-mode. The switching frequency is 84 kHz. Yesterday, I went on foot with my RFI
/archives//html/RFI/2015-11/msg00014.html (6,952 bytes)

4. [RFI] FW: Galaxy Grow Light Ballast Update (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Tue, 2 Feb 2016 17:13:41 -0500
current. GFCI's sample current in the phase (hot) and neutral conductor, and open the circuit if they are out of balance by more than 6-10 mA, which means that current must be flowing on the Green w
/archives//html/RFI/2016-02/msg00019.html (9,282 bytes)

5. Re: [RFI] GFCI Operation (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Tue, 2 Feb 2016 17:39:24 -0500
conducting current to the ground conductor or external ground, but it will not protect against a shock from the hot to the neutral wires. One can still be seriously shocked in a GFCI-protected circu
/archives//html/RFI/2016-02/msg00020.html (8,660 bytes)

6. [RFI] FW: Garage Door Opener RFI (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Tue, 15 Mar 2016 07:07:42 -0400
We can add the new Chamberlain "PD" series garage door openers to the growing list of RFI-generating devices. Two weeks ago, I replaced a Chamberlain HD series model but found that this series is lon
/archives//html/RFI/2016-03/msg00032.html (8,030 bytes)

7. [RFI] FW: Quiet Switching Power Supply? (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Thu, 4 Aug 2016 09:51:05 -0400
background noise is going to cover up any minuscule noise that the best switchers for ham use are going to emit. " Dale, that's probably true when using coaxial lines and resonant antennas but all s
/archives//html/RFI/2016-08/msg00013.html (9,167 bytes)

8. Re: [RFI] Quiet Switching Power Supply? (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Thu, 4 Aug 2016 12:31:44 -0400
but ONLY if installed correctly! Joe WB9SBD" Please explain how to install balanced transmission line correctly to mitigate RFI on receive. Thanks! Paul, W9AC _______________________________________
/archives//html/RFI/2016-08/msg00017.html (9,240 bytes)

9. Re: [RFI] FW: Quiet Switching Power Supply? (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Thu, 4 Aug 2016 12:52:59 -0400
"Key word, Balanced, done, if you keep it balanced it is self shielding, if it gets un balanced then signals leak out and in." Sounds good, but not possible in the real world. Small changes in balanc
/archives//html/RFI/2016-08/msg00019.html (11,539 bytes)

10. Re: [RFI] Switching Power Supply test Video (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Sun, 7 Aug 2016 13:30:00 -0400
the shack. And that's probably the most influential factor. The proximity of the SMPS to antennas, lines, and equipment mean everything. We often hear/see reports that "brand X" supply is quiet and
/archives//html/RFI/2016-08/msg00038.html (7,362 bytes)

11. [RFI] ROKU/SLING-TV RFI (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Wed, 18 Jan 2017 11:01:37 -0500
We can add the new Roku/Sling-TV power adapter to the list of extreme RFI generators. Interference is most prevalent in the AM broadcast band and it is intense. I have attached photos of the Roku pow
/archives//html/RFI/2017-01/msg00051.html (7,358 bytes)

12. [RFI] Spectrum RFI Tracking (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Sun, 5 Feb 2017 09:30:10 -0500
Tom, Great work by you and W0QE. After you met with CenturyLink's leadership team, did they develop an action plan for a final resolution of the problem? Congrats to Larry, W0QE for creating a shared
/archives//html/RFI/2017-02/msg00003.html (7,947 bytes)

13. [RFI] FW: RFI every 15 KHz on 160 meters, suspect source is a manufacturing facility. (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Mon, 22 Jan 2018 09:27:42 -0500
Don, Good job so far but you need to triangulate the noise source before contacting anyone. Maybe you did triangulate but the video doesn't show validation at another location. If you haven't, that m
/archives//html/RFI/2018-01/msg00056.html (9,527 bytes)

14. [RFI] LED Yard Light (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Tue, 30 Jan 2018 10:14:54 -0500
I need to install a yard light at the apex of a storage shed that's at my remote internet location. I could go with sodium vapor and consumption is about 150W while on in the evening. OTOH, high-inte
/archives//html/RFI/2018-01/msg00129.html (7,077 bytes)

15. [RFI] FW: wireless power transfer via 160M band (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Wed, 7 Feb 2018 15:27:05 -0500
feeds back sync info to the transmitter. If the receiver and transmitter do not have their hi Q circuits locked the power transfer efficiency is very low. There are schemes that adjust the TX and th
/archives//html/RFI/2018-02/msg00046.html (8,252 bytes)

16. Re: [RFI] Update: LG washer WT1501CW - EMI (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Sat, 17 Nov 2018 07:05:59 -0500
§15.103(d) has been discussed here several times during the last decade. There are two troubling aspects of the current rule that we must accept: (1) digital devices that would otherwise require comp
/archives//html/RFI/2018-11/msg00062.html (9,152 bytes)

17. [RFI] FW: Common mode choke on 4 Square feedlines without skewing phasing? (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Tue, 29 Jan 2019 15:55:57 -0500
some RG400 chokes? Don't rule out surplus RG-303. It's not too common but it can be found with some searching. RG-303 is similar in construction and power handling to RG-142/RG-400 but with a slight
/archives//html/RFI/2019-01/msg00055.html (9,853 bytes)

18. Re: [RFI] "Quiet" 12 volt LED "fixture" (2' or 4') (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Tue, 29 Jan 2019 16:14:24 -0500
of inches, cut off what you need with scissors. Sticky tape on the back. ebay & amazon. cheap. Grant KZ1W" I installed a six ft. section of "warm" white LED tape just beneath my shack's tabletop ris
/archives//html/RFI/2019-01/msg00057.html (8,234 bytes)

19. [RFI] Multi-Stage High Efficiency Air Conditioner Units (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Sun, 9 Feb 2020 08:09:33 -0500
lines at the box's keying jack and that fixed the problem." That often works fine on control circuits but for audio circuits and other circuits that require maintaining signal waveform integrity, I
/archives//html/RFI/2020-02/msg00066.html (9,301 bytes)

20. [RFI] Tracking Electrical Interference in 1924 (score: 1)
Author: "Paul Christensen" <pchristensen@ieee.org>
Date: Tue, 26 Jan 2021 18:51:12 -0500
For those interested, I have linked to a 1924 QST article that discusses how Perry Briggs, 1BGF (of "low-loss" tuner fame), tracked down an arcing street lamp through the Hartford, CT neighborhoods.
/archives//html/RFI/2021-01/msg00122.html (6,712 bytes)

Current List: 1 - 20
Page: [1] [2]
This search system is powered by Namazu