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References: [ +from:w9ac@arrl.net: 93 ]

Total 93 documents matching your query.

61. Re: [RFI] Power Supply - Noise Frequency Adjust? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 21 May 2011 15:49:51 -0400
I'm surprised by the acceptance of these supplies in the ham community. 10+ years ago, SMPS manufacturers may not have had a good understanding of EM compliance. Today, there's no excuse. It takes no
/archives//html/RFI/2011-05/msg00078.html (10,638 bytes)

62. [RFI] 30m Interference (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 30 May 2011 07:19:17 -0400
Looking for clues concerning interference to the 30m band being caused by what appears to be two digitally-modulated transmissions, one exactly at 9955 kHz and the other at 9965 kHz. The peak amplitu
/archives//html/RFI/2011-05/msg00096.html (7,184 bytes)

63. Re: [RFI] Comcast Wall warts (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 21 Jun 2011 11:38:23 -0400
For many folks, home heating and cooling costs swamp the remaining monthly use charges of electronic appliances. I recently had an energy audit conducted by my local utility. This home use a total o
/archives//html/RFI/2011-06/msg00012.html (8,003 bytes)

64. Re: [RFI] Comcast Wall warts (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 21 Jun 2011 11:42:12 -0400
Jim, there's still a gaping hole even with enforcement. Part 15 still excludes "appliances" from certification. This is an area where the League could take the lead on change -- but I cannot even im
/archives//html/RFI/2011-06/msg00013.html (7,928 bytes)

65. Re: [RFI] National RF HFDF Vector Gun Update (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 10 Jul 2011 16:53:48 -0400
Frank, nice report and much appreciated... One limitation of the National that it is only specified to work down to 10 MHz. I had seen this unit before but stopped short of a purchase due to this li
/archives//html/RFI/2011-07/msg00004.html (7,862 bytes)

66. Re: [RFI] National RF HFDF Vector Gun Update (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 10 Jul 2011 17:31:35 -0400
Great news, Frank. Thanks for investigating this product for us. Paul, W9AC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/lis
/archives//html/RFI/2011-07/msg00006.html (9,709 bytes)

67. Re: [RFI] Receiver settings for hearing RFI? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 11 Mar 2012 08:26:47 -0400
That's a ritual I go through once a month. It goes much faster if you can see the entire band on a panadapter. Since the display is RF-sampled, noise is identified regardless of receive mode. I use
/archives//html/RFI/2012-03/msg00006.html (8,709 bytes)

68. Re: [RFI] Receiver settings for hearing RFI? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 11 Mar 2012 08:56:02 -0400
Sam, Good info. One advantage of using the netbook PC and SDR receiver is that noise signatures can be saved and archived on-the-fly. This is helpful when identifying a reoccurring noise source. For
/archives//html/RFI/2012-03/msg00009.html (10,015 bytes)

69. Re: [RFI] Receiver settings for hearing RFI? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 11 Mar 2012 11:32:10 -0400
Once you have a panadapter, it's easy to become obsessive in trying to get a flat noise baseline without any switch-mode "bumps." Maintaining a flat baseline on all bands can involve a lot of contin
/archives//html/RFI/2012-03/msg00017.html (9,802 bytes)

70. Re: [RFI] Samsung refrigerator RFI (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 8 Aug 2012 21:32:51 -0400
Yesterday's news. http://lists.contesting.com/archives//html/RFI/2009-08/msg00037.html Unlike EU (my understanding of EU rules), there are no conducted emissions requirements through certification f
/archives//html/RFI/2012-08/msg00045.html (11,760 bytes)

71. Re: [RFI] Samsung refrigerator RFI (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 8 Aug 2012 21:43:49 -0400
manufacturer is obliged to assure that his devices do not cause interference to radio or TV. FCC Part 15.103 states: The operator of the exempted device shall be required to stop operating the devic
/archives//html/RFI/2012-08/msg00046.html (8,693 bytes)

72. [RFI] Radar Engineers RFI Analyzers (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 24 Dec 2012 10:07:21 -0500
Seasons greetings to all... There's been enough RFI at this QTH during the last decade that I'm looking to purchase a National HF Vector Gun and a used Radar Engineers (RE) RFI analyzer, model 240A o
/archives//html/RFI/2012-12/msg00107.html (8,968 bytes)

73. Re: [RFI] Radar Engineers RFI Analyzers (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 24 Dec 2012 10:56:22 -0500
...Or skip the CATV FSM and go directly to the dongle (less than $40) and upconverter. This will limit your expense to less than $100 (plus portable computer) and you have an SDR with a noise calibra
/archives//html/RFI/2012-12/msg00109.html (12,988 bytes)

74. Re: [RFI] Radar Engineers RFI Analyzers (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 25 Dec 2012 07:25:01 -0500
I have not detected any RFI from the inverter. I use a Radar Engineer's Model 240A for a receiver. My car's engine, an Avalon, is a bigger problem. I use my Tek scope, a TDS 210, to get a larger disp
/archives//html/RFI/2012-12/msg00127.html (10,814 bytes)

75. Re: [RFI] Electrical transfomer near shack, a problem? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 10 Jan 2013 13:44:44 -0500
Virtually all audio transformers used by hams are unshielded -- shielded transformers are used in pro audio (Jensen, of Burbank, CA is the Cadillac brand), but they aren't cheap. Adding to Jim's reco
/archives//html/RFI/2013-01/msg00071.html (8,531 bytes)

76. Re: [RFI] noise every 60 Khz (score: 1)
Author: Paul Christensen <w9ac@arrl.net>
Date: Thu, 20 Jun 2013 13:24:12 -0400
It's switch mode. To localize, start by killing power in your residence. If it remains, you must then triangulate the switching source with a directional antenna and portable receiver. In lieu of tri
/archives//html/RFI/2013-06/msg00036.html (7,911 bytes)

77. Re: [RFI] ONE wallwart (score: 1)
Author: Paul Christensen <w9ac@arrl.net>
Date: Sat, 31 Aug 2013 20:40:25 -0400
Excellent advice from Dale. In addition to PowerOne and International Power, Condor is the third company making nearly Identical linear supplies. I use all three brands. As Dale noted, these are OEM
/archives//html/RFI/2013-08/msg00073.html (14,007 bytes)

78. Re: [RFI] Are newer LG models still RF quiet??? - Washing Machine RFI revisited (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 24 Sep 2013 12:37:03 -0400
Be careful with the new LG linear compressor refrigerators. Mine outputs low level spurs every 2 kHz on 40m Obviously, noise level is a function of orientation between the appliance, antenna and if u
/archives//html/RFI/2013-09/msg00045.html (10,372 bytes)

79. Re: [RFI] Are newer LG models still RF quiet??? - Washing Machine RFI revisited (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 24 Sep 2013 13:53:28 -0400
You mean Part 15? Did I really say Part 95? And of all the CFR sections, it was 95? Sheesh and I can't use lack of coffee as an excuse! Specifially, I meant Sec. 15.103(d) for starters... You'd be ri
/archives//html/RFI/2013-09/msg00047.html (9,829 bytes)

80. Re: [RFI] Fwd: RFI Identification Help (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 12 Nov 2013 10:48:57 -0500
I use 2 tools to great advantage in my professional work as a utility RFI investigator: Tecsun PL660 and the National RF HFDF Vector Gun kit. For the low-band SMPS noise sources, some folks may want
/archives//html/RFI/2013-11/msg00016.html (10,096 bytes)

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