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Total 24 documents matching your query.

1. Re: [RFI] Finding noise source (score: 1)
Author: "Martin, AA6E" <martin.s.ewing@gmail.com>
Date: Fri, 15 Aug 2008 10:07:00 -0400
Yuri, I would try a portable AM broadcast radio, if the noise is there in the AM band. Just walking around the neighborhood and looking for maximum loudness might be sufficient. You can also use the
/archives//html/RFI/2008-08/msg00019.html (8,935 bytes)

2. Re: [RFI] ethernet EMI revisited - questions for the pros (score: 1)
Author: "Martin Ewing" <martin.s.ewing@gmail.com>
Date: Sun, 16 Nov 2008 08:22:24 -0500
This is an interesting discussion. I would add a few points/questions: -Does anyone know of published "typical" spectra of 1000baseT vs 100 vs 10? I agree that 10bT is much quieter on HF than 100bT,
/archives//html/RFI/2008-11/msg00027.html (9,519 bytes)

3. Re: [RFI] ethernet EMI revisited - questions for the pros (score: 1)
Author: "Martin Ewing" <martin.s.ewing@gmail.com>
Date: Mon, 17 Nov 2008 15:54:14 -0500
In my experience, the RFI from Ethernet is mostly *not* broad spectrum. (This is distinct from any other hash generated by router processors, etc.) It appears as a set of carrier tones every 62 KHz o
/archives//html/RFI/2008-11/msg00032.html (10,265 bytes)

4. Re: [RFI] ethernet EMI revisited - questions for the pros (score: 1)
Author: "Martin Ewing" <martin.s.ewing@gmail.com>
Date: Wed, 26 Nov 2008 02:55:27 -0500
How do you do random length "infrastructure" cabling with fiber? All I see are pre-cut and terminated jumpers for sale. I assume that means that cutting and terminating fiber is a non-trivial operati
/archives//html/RFI/2008-11/msg00051.html (9,282 bytes)

5. Re: [RFI] Wireless - ATT U-verse (score: 1)
Author: "Martin Ewing" <martin.s.ewing@gmail.com>
Date: Sun, 30 Nov 2008 14:00:35 -0500
Rick, On the basis of following some U-verse lists, but with no direct experience, the following: wiring (probably not even twisted pair). At your house there would be an outdoor box (a Residential G
/archives//html/RFI/2008-11/msg00059.html (8,901 bytes)

6. Re: [RFI] CFLs and LEDs (score: 1)
Author: "Martin Ewing" <martin.s.ewing@gmail.com>
Date: Fri, 9 Jan 2009 20:29:03 -0500
Remind me, what is the argument for buying a '7800? I need to explain to the XYL. -- Martin Ewing, AA6E Branford, CT _______________________________________________ RFI mailing list RFI@contesting.co
/archives//html/RFI/2009-01/msg00056.html (7,603 bytes)

7. Re: [RFI] DSL interference (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Thu, 19 Feb 2009 17:08:03 -0500
Can't help much with the RFI issue, but I want to know where you find telco people like that! Actually, it occurs to me that you could move your telco entrance back to its original location, split ou
/archives//html/RFI/2009-02/msg00100.html (8,038 bytes)

8. Re: [RFI] ATT U-Verse RFI issues??? (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Mon, 20 Jul 2009 18:07:36 -0400
I'm not a Uverse subscriber -- it's not in my neighborhood -- but I can relate an incident that happened today. I sometimes listen to a weak AM BC station on 820 kHz. While driving around town, I not
/archives//html/RFI/2009-07/msg00013.html (8,626 bytes)

9. Re: [RFI] Henry Ott's New Book (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Sun, 6 Sep 2009 14:10:27 -0400
Thanks for the pointer. I see the book is $96 at Amazon, but $126 for Kindle. Go figure. (And figures are probably an issue with the Kindle edition, if it's like most books I've read on my K2.) 73 Ma
/archives//html/RFI/2009-09/msg00018.html (6,828 bytes)

10. Re: [RFI] Electric blankets (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Wed, 18 Nov 2009 11:27:58 -0500
I don't know what's to "take on"... It's the common problem of too much "smart" control with too little RFI suppression. The same thing applies to my little world globe touch-sensitive lamp in the ki
/archives//html/RFI/2009-11/msg00042.html (8,116 bytes)

11. Re: [RFI] New switching wallwarts - RFI potential? (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Tue, 12 Jan 2010 11:08:07 -0500
Interesting about LF EMC, but no info on the new switching supplies. I have done no serious tests, but so far have not seen any issues with the new generation mini-switching wall-warts -- and they ar
/archives//html/RFI/2010-01/msg00041.html (10,431 bytes)

12. Re: [RFI] New switching wallwarts - RFI potential? (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Tue, 12 Jan 2010 13:40:26 -0500
Nicely explained in the 2010 ARRL Handbook 7.7.4. You want fast recovery diodes. Of course, fast recovery (50 ns), while it reduces the reverse-bias energy per cycle, may still mean lots of HF harmon
/archives//html/RFI/2010-01/msg00046.html (9,958 bytes)

13. Re: [RFI] RFI from flat screens? (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Fri, 15 Jan 2010 16:16:19 -0500
quality than normal LCDs that use fluorescent light sources, but otherwise they are similar. See http://en.wikipedia.org/wiki/LED-backlit_LCD_television . Oh, and they are more expensive. They are ne
/archives//html/RFI/2010-01/msg00053.html (9,104 bytes)

14. Re: [RFI] Does a power pole generating RFI always generate ultrasonics? (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Tue, 8 Jun 2010 09:19:27 -0400
http://en.wikipedia.org/wiki/High-voltage_direct_current -- Dr. Martin S. Ewing, AA6E Member IEEE, URSI, AAS, ARRL Branford, Connecticut _______________________________________________ RFI mailing li
/archives//html/RFI/2010-06/msg00018.html (9,648 bytes)

15. [RFI] AT&T U-verse (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Sat, 23 Oct 2010 22:24:34 -0400
A glutton for punishment, I switched our household from Comcast CATV to AT&T U-verse (TV, Internet, VOIP) when it came to my neighborhood. It's been about a month now and I've had a chance to do some
/archives//html/RFI/2010-10/msg00080.html (7,074 bytes)

16. Re: [RFI] ATT Uverse (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Mon, 10 Jan 2011 17:55:56 -0500
Mike, I'm working on this at my house in CT. 80 & 40 M are the problem. U-Verse uses VDSL2, which occupies ~DC - 8.5 MHz. Sometimes I can operate 100 W, and after the U-Verse gateway dies and reboots
/archives//html/RFI/2011-01/msg00092.html (8,232 bytes)

17. Re: [RFI] ATT Uverse (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Tue, 11 Jan 2011 22:11:32 -0500
There are two very different flavors of U-Verse. One is FTTH (fiber to the home), like Verizon's FIOS, but MUCH more common is the FTTN (fiber to the Neighborhood) version. FTTN uses a "node" (called
/archives//html/RFI/2011-01/msg00102.html (10,006 bytes)

18. Re: [RFI] U-Verse problem update (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Tue, 15 Feb 2011 16:50:15 -0500
There are two kinds of "U-Verse". One is FTTH (fiber to the home, like FIOS) and one is FTTN (fiber to the neighborhood/node) with copper connections ranging up to 3000 ft or so from the central "Nod
/archives//html/RFI/2011-02/msg00076.html (7,593 bytes)

19. Re: [RFI] U-Verse problem update (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Tue, 15 Feb 2011 21:54:16 -0500
AT&T has "serious" line isolator filters for both Cat5/6 and RG-6 (HPNA). They installed some in my U-verse setup and they helped considerably in at least one case (a sensitive STB). Some of the U-ve
/archives//html/RFI/2011-02/msg00080.html (8,127 bytes)

20. Re: [RFI] U-Verse problem update (score: 1)
Author: Martin Ewing <martin.s.ewing@gmail.com>
Date: Wed, 16 Feb 2011 15:23:30 -0500
Where is this "real AT&T" of which you speak? Check out http://en.wikipedia.org/wiki/Ship_of_theseus . Martin -- Martin Ewing Branford, Connecticut martin.s.ewing@gmail.com __________________________
/archives//html/RFI/2011-02/msg00082.html (8,802 bytes)

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