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References: [ +from:K1TTT@ARRL.NET: 172 ]

Total 172 documents matching your query.

101. Re: [RFI] RFI from HIGH voltage power lines (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sat, 02 Jun 2012 11:12:13 +0000
No, it won't affect the waveforms, but it might affect antenna patterns due to reflections from the large metal objects. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://wiki.k1ttt.net A
/archives//html/RFI/2012-06/msg00015.html (14,313 bytes)

102. Re: [RFI] Single-point grounding (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sun, 01 Jul 2012 14:58:48 +0000
That would seem adequate... I just run a piece of 4/0 wire around the baseboard and go up the back of each operating table with a piece just hose clamped to it then unwrap strands to go to the radio,
/archives//html/RFI/2012-07/msg00002.html (8,965 bytes)

103. Re: [RFI] Noise emitted by rotator (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sun, 05 Aug 2012 10:35:30 +0000
There are 2 things to consider in this... in that rotor the motor is actually isolated from ground, and it contains a filter circuit consisting of chokes and capacitors. One of the first odd things I
/archives//html/RFI/2012-08/msg00018.html (9,529 bytes)

104. Re: [RFI] Noise emitted by rotator (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sun, 05 Aug 2012 15:13:20 +0000
No pwm in there, just simple dc voltage control... it even has a 330uf filter cap just before the direction switching relay. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://wiki.k1ttt.n
/archives//html/RFI/2012-08/msg00021.html (13,913 bytes)

105. Re: [RFI] Noise emitted by rotator (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sun, 05 Aug 2012 17:03:02 +0000
I would try small ceramic filter caps at the rotor connector. Just on the power leads at first, then maybe to the shell ground to see what combination stops the noise from getting out. David Robbins
/archives//html/RFI/2012-08/msg00023.html (16,358 bytes)

106. Re: [RFI] Dell D505 PA-10 PS (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Fri, 10 Aug 2012 19:10:34 +0000
Have you heard about running 'xp mode' on win7?? That lets you run a win-xp virtual machine inside win7 for those programs that the compatibility settings can't handle. It might be worth a try. David
/archives//html/RFI/2012-08/msg00052.html (7,481 bytes)

107. [RFI] professional question (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Thu, 23 Aug 2012 23:05:06 +0000
Yes, this is for where I work, I don't do this stuff on my own. but we are a non-profit lab, so its not all that bad. Does anyone on here know of a modern version of or an accepted replacement for an
/archives//html/RFI/2012-08/msg00098.html (6,957 bytes)

108. Re: [RFI] Fan motor RFI (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Fri, 07 Sep 2012 12:45:13 +0000
A 12ga with buckshot comes to mind. Otherwise start trying some of the brute force line filters. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://wiki.k1ttt.net AR-Cluster node: 145.69MH
/archives//html/RFI/2012-09/msg00015.html (7,375 bytes)

109. [RFI] just what everyone needs! (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sun, 09 Sep 2012 11:28:33 +0000
http://www.surplussales.com/Wire-Cable/Wire7.html But what makes it so good at 'absorbing' rfi?? And at $1/ft for 22ga wire it must be pretty good! _______________________________________________ RFI
/archives//html/RFI/2012-09/msg00019.html (6,787 bytes)

110. Re: [RFI] just what everyone needs! (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sun, 09 Sep 2012 13:10:02 +0000
Believe it or not... its actually a mil spec item. I did some searching and it is mil-c-85485/5 which you can see at: http://assistdocs.com/search/document_details.cfm?ident_number=34825&StartRo w=54
/archives//html/RFI/2012-09/msg00021.html (9,773 bytes)

111. [RFI] any ideas on this one? (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sun, 11 Nov 2012 19:09:41 +0000
160m noise, 50khz wide, very sharp edges and stable frequency. recordings and spectrum images at: http://wiki.k1ttt.net/2012%20Maintenance%20and%20Upgrade%20Blog.ashx#160mrfi ________________________
/archives//html/RFI/2012-11/msg00031.html (6,850 bytes)

112. Re: [RFI] any ideas on this one? (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sat, 17 Nov 2012 12:07:01 +0000
I did some more analysis of it today and left another note for the homeowner... may post screenshots and data on web page later. I put a better antenna on my qs1r and upped the rate and it looks like
/archives//html/RFI/2012-11/msg00042.html (9,257 bytes)

113. Re: [RFI] any ideas on this one? all gone... (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Sat, 17 Nov 2012 16:56:42 +0000
Well, got a call last night from the owner and met him there this morning... but the noise was already gone when I got there. he did turn back on a couple things that they had turned off in the morni
/archives//html/RFI/2012-11/msg00043.html (9,624 bytes)

114. Re: [RFI] 160m ARDF / fox hunt antenna (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Fri, 30 Nov 2012 13:50:39 +0000
I use a simple loop. A half dozen turns of leftover insulated copperweld about 18" in diameter taped to a fiberglass electric fence rod. Directly attach rg-58 or 8x coax and wind as many turns as pos
/archives//html/RFI/2012-11/msg00064.html (7,942 bytes)

115. Re: [RFI] Screenshots of a wideband short pulse (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Fri, 14 Dec 2012 00:37:08 +0000
Probably something arcing. Could be anything from a bad insulator on a power line to a light switch, neon sign, street light, or a fish tank heater. First eliminate your house, turn off every breaker
/archives//html/RFI/2012-12/msg00051.html (10,593 bytes)

116. [RFI] rfi pamphlet (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Fri, 21 Dec 2012 12:50:28 +0000
Long ago and far away I remember a pamphlet being available that you could give to neighbors that were generating noise to explain what they were doing was bad. It was apparently an arrl/cea collabor
/archives//html/RFI/2012-12/msg00091.html (6,745 bytes)

117. Re: [RFI] How to Get Rid of RFI-Prone Devices (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Mon, 24 Dec 2012 19:02:22 +0000
Sounds like my experience in a town house apartment... the neighbors put a stereo against the common wall and liked to turn it up too loud. So when it got louder than I liked I went and started sendi
/archives//html/RFI/2012-12/msg00118.html (11,034 bytes)

118. Re: [RFI] rfi pamphlet (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Mon, 24 Dec 2012 19:08:04 +0000
Couldn't find pamphlet so I wrote a note to him that included a copy of http://www.w0qe.com/RF_Interference/grow_light_electronic_ballasts.html and http://transition.fcc.gov/eb/AmateurActions/files/G
/archives//html/RFI/2012-12/msg00119.html (9,123 bytes)

119. Re: [RFI] rfi pamphlet (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Wed, 26 Dec 2012 13:45:35 +0000
No, I remember seeing those and deciding they wouldn't do what I needed... digital and satellite tv prevents most of the tvi we used to have to find, and home owners just aren't that worried about no
/archives//html/RFI/2012-12/msg00145.html (11,370 bytes)

120. Re: [RFI] Troubleshooting AFCI Tripping Due To Amateur Transmissions (score: 1)
Author: "K1TTT" <K1TTT@ARRL.NET>
Date: Fri, 04 Jan 2013 12:01:06 +0000
Though AFCIs and GFCIs may look similar, they are very different. AFCIs are a relative newcomer to the scene and the fixes for one may not be the same for the other... see: http://en.wikipedia.org/wi
/archives//html/RFI/2013-01/msg00042.html (15,164 bytes)

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