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References: [ +from:k7wxw@qrpdx.org: 14 ]

Total 14 documents matching your query.

1. [RFI] tips on building common mode chokes (score: 1)
Author: bill K7WXW <K7WXW@qrpdx.org>
Date: Wed, 31 Oct 2018 11:56:14 -0700
I am building a set of feed line common mode chokes to test in my shack, using K9YC's published test data and charts (mahalo, Jim!).  Since the chokes will be inserted into existing feed lines, each
/archives//html/RFI/2018-10/msg00043.html (7,737 bytes)

2. [RFI] QRM eliminating antenna, November Radcom (score: 1)
Author: bill K7WXW <K7WXW@qrpdx.org>
Date: Wed, 31 Oct 2018 12:57:09 -0700
Has anyone here read the November article on using the feedline portion of a doublet as a noise antenna for phase cancelling QRM? I am still trying to puzzle out how it might work, and under what con
/archives//html/RFI/2018-10/msg00044.html (6,707 bytes)

3. [RFI] "construction" tips for common mode chokes (score: 1)
Author: bill K7WXW <K7WXW@qrpdx.org>
Date: Thu, 1 Nov 2018 09:08:38 -0700
Thanks for the info on what you are doing Jim, and Davem the offer to share data on your chokes.  I am looking forward to studying all of it. If I separate "how many turns and what materials should b
/archives//html/RFI/2018-11/msg00000.html (6,609 bytes)

4. [RFI] looking for balun article (score: 1)
Author: bill K7WXW <K7WXW@qrpdx.org>
Date: Sun, 18 Nov 2018 09:30:35 -0800
GM - I am looking for a PDF of "Baluns in the Real (and Complex) World" by Frank Witt from the ARRL Antenna Compendium, Volume 5.  Interlibrary loan was a no go. If someone has a copy and would be wi
/archives//html/RFI/2018-11/msg00069.html (7,094 bytes)

5. Re: [RFI] looking for balun article (score: 1)
Author: bill K7WXW <K7WXW@qrpdx.org>
Date: Sun, 18 Nov 2018 09:55:01 -0800
Jamie - Thanks! You can contact me offline either way, k7wxw@qrpdx.org.  73 bill ______________ brevity is beautiful. Jamie WW3S wrote on 11/18/18 9:54 AM: I think I have volume 5, I can try to scan
/archives//html/RFI/2018-11/msg00071.html (7,642 bytes)

6. [RFI] thrashing SMPS (score: 1)
Author: bill K7WXW <k7wxw@qrpdx.org>
Date: Thu, 29 Nov 2018 13:01:52 -0800
I am currently in the second (or third) phase of taming the EMI/RFI that plagues my middle-of-the-city-garden-lot-antenna-surrounded-by-RF-sources station. I learned pretty quickly that fixing it was
/archives//html/RFI/2018-11/msg00121.html (8,334 bytes)

7. [RFI] external noise source identification (score: 1)
Author: bill K7WXW <K7WXW@qrpdx.org>
Date: Fri, 21 Dec 2018 14:19:14 -0800
GA All My noise reduction project continues. I have been working on noise sources in my house but need some help with what seems to be an external source. For data capture, I am using an RSPro2 and R
/archives//html/RFI/2018-12/msg00052.html (9,452 bytes)

8. Re: [RFI] external noise source identification (score: 1)
Author: bill K7WXW <K7WXW@qrpdx.org>
Date: Fri, 21 Dec 2018 18:53:39 -0800
GE Don, Yes I hear them. They aren't like a SMPS or arcing RF audio which is pretty easy to identify but it is not quite white noise either. I am running the system with the gain turned down and the
/archives//html/RFI/2018-12/msg00059.html (13,524 bytes)

9. [RFI] Update... Re: external noise source identification (score: 1)
Author: bill K7WXW <K7WXW@qrpdx.org>
Date: Sun, 23 Dec 2018 18:06:19 -0800
First, thanks for the help and suggestions. A number of people thought my laptop might be generating artifacts, so I ran a couple of tests. On the assumption that the laptop was generating the RFI: 1
/archives//html/RFI/2018-12/msg00060.html (8,325 bytes)

10. [RFI] a small win in the RFI project: LED traffic signal (score: 1)
Author: bill K7WXW <K7WXW@qrpdx.org>
Date: Thu, 17 Jan 2019 13:58:03 -0800
My RFI battle continues unabated. While I've quieted most of the sources in the house (I still have to figure out how to tame the HVAC system), external noises sources continue to accumulate.  There
/archives//html/RFI/2019-01/msg00017.html (8,637 bytes)

11. Re: [RFI] A troubling new source of RFI (score: 1)
Author: bill K7WXW <K7WXW@qrpdx.org>
Date: Thu, 17 Jan 2019 18:56:52 -0800
I've experimented with ethernet-over-power and ethernet-over-cable (MOCA). While I never experienced my RF transmissions causing adapter malfunctions, I did found that some brands of adapters generat
/archives//html/RFI/2019-01/msg00022.html (7,976 bytes)

12. [RFI] noise source clues - anyone know what these are? (score: 1)
Author: bill K7WXW <k7wxw@qrpdx.org>
Date: Sun, 27 Jan 2019 10:47:31 -0800
I continue to collect data in my search for RFI sources. The two screenshots, with detail 3 and detail 4, were taken with the house power turned off, from an RSP2 connected to a dell laptop running o
/archives//html/RFI/2019-01/msg00043.html (7,981 bytes)

13. [RFI] RFI hunting... here's the file link (score: 1)
Author: bill K7WXW <K7WXW@qrpdx.org>
Date: Sun, 27 Jan 2019 12:49:50 -0800
Sorry... I am the gang that can't shoot straight today.  Here's the link to the images I mentioned in my last email: https://www.dropbox.com/sh/x6nff71a1iakg7y/AAALpTsfBvUqNXn3u3u0PClXa?dl=0 73 Bill
/archives//html/RFI/2019-01/msg00045.html (6,810 bytes)

14. Re: [RFI] Bulk order source for Ferrite beads? (score: 1)
Author: bill K7WXW <K7WXW@qrpdx.org>
Date: Sun, 3 Feb 2019 10:37:23 -0800
I did a ferrite bulk order two months ago.  I got quotes from Pacific Lodestone, DigiKey, Kreg, Mouse, Newark and Arrow.  On the T31 and T43 parts, Arrow was least expensive on all but the 2.4" toroi
/archives//html/RFI/2019-02/msg00012.html (9,149 bytes)


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