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Re: [RFI] W3NQN AC Line Filters

To: <rfi@contesting.com>
Subject: Re: [RFI] W3NQN AC Line Filters
From: Jim Hill <hro5-2@cox.net>
Date: Wed, 21 Nov 2007 09:02:06 -0800
List-post: <mailto:rfi@contesting.com>
Hi Tim: Could you provide some info about the filter, such as power 
ratings and how you connected it - next to the computer, at the wall 
plug, grounding, etc?  I have serious problems listening in my travel 
trailer when at a RV park.  Sometimes, most of the noise comes 
through the AC power line. I managed to get a commercial line filter 
that probably costs hundreds of dollars new, made adapters and 
connected it next to the RV park power outlet, but little or no 
help.  I tried grounding the case to the power enclosure, but didn't 
see much difference. Possibly the filter was defective, but more 
likely it was the setup.  I resolved the problem by running the 
trailer on internal battery power, but like turning off your computer 
not the best approach.


At 02:18 PM 11/20/2007, you wrote:
>Recently, someone made a post here suggesting the use of a W3NQN AC 
>Line Filter.  Unfortunately, I didn't save that message, but wanted 
>to say thanks to whoever made that suggestion.
>About a year ago, I installed Beverages here for the first 
>time.  Due to my limited space, the only way to have a NE/SW 
>Beverage was to have it running very near the outside wall of my 
>house.  This made the Beverage only about 15 feet from my computer 
>and house wiring.  The close placement caused S9 noise from the 
>computer when using the Beverage in the NE direction, and somewhat 
>less in the SW direction.  I tried disconnecting every cable except 
>the power cable from the computer, and there was no noticeable 
>difference in the noise level.  The only way to stop the noise was 
>to power down the computer, pretty inconvenient every time I wanted 
>to work someone on 160.  I ordered the W3NQN filter, and now have 
>the computer power cord connected through this filter.  The noise is 
>completely gone, down from S9 to S0.  It will sure be a pleasure to 
>be on 160 this winter without having to power down the 
>computer.  The filter was a little pricey, but I think it will be 
>well worth it.
>73, Tim - N3XX
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