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Re: [RFI] RFI Identification Help

To: <rfi@contesting.com>
Subject: Re: [RFI] RFI Identification Help
From: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 13 Nov 2013 10:03:37 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
It doesn't seem to be on at night, so
wonder what might run during the day with this type of cycling that wouldn't
be running at night.

You won't know until you get out and localize the source. There are all kinds of things that run during the day and not at night. For the last two weeks, switch mode noise was apparent on 160m during 10am and 4pm only. What kind of device could emit that noise only during those hours? Answer: a human being. A contractor was charging high-capacity batteries with a switch-mode charger while he was on the job site. A neighbor is having him install a room addition.

Maybe this example begins to show why we need to stop thinking about what it could be, and just use some brain power on our legs to find the source. Guesses as to street lights, night lights, etc., are only going to slow you down.

Despite my pontificating, I was guilty of this thinking myself. Years ago, I posted screen shots and asked "what could this be?" Dozens of answers came back and not one of them was helpful in finding the root cause. That made be a believer in Frank Haas' philosophy of not assuming anything.

Paul, W9AC
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