Search String: Display: Description: Sort:

Results:

References: [ +from:k1ttt@arrl.net: 172 ]

Total 172 documents matching your query.

41. Re: [RFI] Power Lines (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sun, 23 Dec 2007 20:05:30 +0000
Yep, that pretty well covers it. And I have worked for EPRI (see http://www.epri.com) for most of the last 10 years anyway even though that is not my full time job right now. David Robbins K1TTT e-ma
/archives//html/RFI/2007-12/msg00052.html (10,873 bytes)

42. [RFI] in case you haven't seen this one (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sat, 29 Dec 2007 12:10:32 +0000
http://www.arrl.org/tis/info/HTML/power_line_handbook/ExternalNoiseHandbook. pdf David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dx
/archives//html/RFI/2007-12/msg00068.html (6,868 bytes)

43. Re: [RFI] TV RFI (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 26 Jan 2008 19:13:31 +0000
If you have cable tv and have tvi your problem will not be solved with high pass filters or low pass filters. Your problems is most likely one of: 1. VERY poor grounding resulting in extremely high c
/archives//html/RFI/2008-01/msg00056.html (9,455 bytes)

44. Re: [RFI] Strange RFI (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 02 Feb 2008 12:55:00 +0000
Spark gap exciting a length of wire that just happens to be resonant on a bad frequency. If its outside the frequency can drift with temperature and humidity, and if the wire isn't real tight also in
/archives//html/RFI/2008-02/msg00005.html (13,008 bytes)

45. Re: [RFI] HF - 80M - Line Nosie Tracking Expedition in Allen, TX (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 03 May 2008 17:34:11 +0000
Ah, but you forgot one important point... how fast did the electric company get there to fix it after you called them? David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-C
/archives//html/RFI/2008-05/msg00001.html (10,612 bytes)

46. Re: [RFI] DTV and Power line RFI (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Wed, 08 Oct 2008 22:07:54 +0000
Line noise that goes away in the rain is usually the sign of either bad insulators or a loose ground connection. On the insulators they will arc when it is dry, but when the water fills the voids the
/archives//html/RFI/2008-10/msg00032.html (18,328 bytes)

47. Re: [RFI] ethernet EMI revisited - questions for the pros (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Wed, 26 Nov 2008 20:02:14 +0000
Terminating fiber is not easy, but kits and instructions are available. But pre-made assemblies are readily available, for instance this place(randomly picked from google search): http://www.fibercab
/archives//html/RFI/2008-11/msg00053.html (12,580 bytes)

48. Re: [RFI] CFLs and LEDs (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sun, 01 Feb 2009 18:30:51 +0000
They would probably arrest you for mailing hazardous wastes. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net _________
/archives//html/RFI/2009-02/msg00002.html (11,006 bytes)

49. Re: [RFI] 2nd harmonic help (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Wed, 04 Feb 2009 22:22:08 +0000
Before throwing money at the problem, be sure you have identified it. Filters on the feedline can only stop harmonics that are generated on the radio side of the filter. If you have a rectifying join
/archives//html/RFI/2009-02/msg00034.html (11,250 bytes)

50. Re: [RFI] Is a Ground-Shortening Switch Better? (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Thu, 12 Mar 2009 23:16:53 +0000
As long as it doesn't shorten the ground so much that it doesn't reach it should be good. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or tel
/archives//html/RFI/2009-03/msg00030.html (8,359 bytes)

51. Re: [RFI] 20 Meter Noise Level (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Fri, 13 Mar 2009 14:35:55 +0000
Well, you pretty much proved it is the tv... unless maybe you have it on a ups that gets noisy when it is loaded down. The easiest thing to fix is if it is from the line cord, add some ferrites or a
/archives//html/RFI/2009-03/msg00034.html (8,235 bytes)

52. Re: [RFI] 20 Meter Noise Level (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Fri, 13 Mar 2009 15:24:15 +0000
Now that would make it a bit easier to see the picture! David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net _____________
/archives//html/RFI/2009-03/msg00039.html (7,243 bytes)

53. Re: [RFI] 40 M and DirecTV (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Thu, 09 Apr 2009 21:38:15 +0000
Is it only when using the satellite? Bring up the channel directory or satellite signal test screen or something else generated in the box and see if that moves when you key up, that would take the l
/archives//html/RFI/2009-04/msg00010.html (8,168 bytes)

54. Re: [RFI] 40m (and other) noise (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Fri, 10 Apr 2009 14:06:13 +0000
I assume when you say 'noise' that it isn't a single carrier, but a wider noise. If that is so then I would say it sounds like a computer monitor or tv. But could be a broadband powerline communicati
/archives//html/RFI/2009-04/msg00013.html (8,567 bytes)

55. Re: [RFI] update <was> 40m (and other) noise (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sat, 11 Apr 2009 11:16:28 +0000
A laptop charger is a good suspect. Had one that someone brought here during a contest that made all sorts of noise. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Clu
/archives//html/RFI/2009-04/msg00021.html (9,722 bytes)

56. Re: [RFI] You gotta LOVE IT - UVerse Blaming Hams (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Fri, 08 May 2009 22:48:55 +0000
How are they delivering you the service?? As far as I can tell its only a high speed dsl that is delivered either on fiber or copper. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www
/archives//html/RFI/2009-05/msg00006.html (9,584 bytes)

57. Re: [RFI] Alarm Systems and EMI/EMC (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sun, 10 May 2009 14:14:26 +0000
I knew there was a good reason not to install a doorbell in my house. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
/archives//html/RFI/2009-05/msg00021.html (11,181 bytes)

58. Re: [RFI] Big Farad versus Hybrid Caps? (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Thu, 18 Jun 2009 23:50:02 +0000
I love it... chrome trimmed caps with volt and amp meters and blue led light strips! Be sure to hook them up only with the oxygen free copper cables, gold terminals and don't try to save by using 4ga
/archives//html/RFI/2009-06/msg00039.html (9,967 bytes)

59. Re: [RFI] Anyone observed damage to the "guard wire grounds"? (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Thu, 18 Jun 2009 22:17:39 +0000
I have never heard them called 'guard' wires. Normal terminology for a non-power carrying conductor above the power line are 'shield' or 'static' wire. These are normally only used on higher voltage
/archives//html/RFI/2009-06/msg00043.html (11,811 bytes)

60. Re: [RFI] Big Farad versus Hybrid Caps? (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Fri, 19 Jun 2009 11:02:08 +0000
I know that, I work at EPRI (www.epri.com) and we worked on developing commercial applications for the super caps. But chrome plating?!?! And built in volt/amp meters???? Can't you just buy a bare ca
/archives//html/RFI/2009-06/msg00044.html (11,754 bytes)

Current List: 41 - 60
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9]
This search system is powered by Namazu