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Re: [RFI] Non-transmitting tower causes RFI/EMI?

To: <n6cy@earthlink.net>, <rfi@contesting.com>
Subject: Re: [RFI] Non-transmitting tower causes RFI/EMI?
From: "Tim Duffy K3LR" <k3lr@k3lr.com>
Reply-to: k3lr@k3lr.com
Date: Tue, 13 Nov 2007 22:22:18 -0600
List-post: <mailto:rfi@contesting.com>
Your neighbor's claim of reradiation is without merit and there is no
science that will back their theory.

That being said, I suggest you contact the manufacture of the device and
explain the situation. Then ask their ENGINEERING department to comment
(debunk) the neighbor's claim. You can call the company on the phone and ask
them to document their suggestions in a letter (or email) that is sent
directly to your neighbor with a CC to you.

Nothing you can say or do will convince the neighbor otherwise. You need an
"out of town" expert... in this case the manufacture of the device is

This is similar to a situation I had 30 years ago when I was in high school.
The neighbor claimed I was "sucking" the TV signals with my Amateur Radio
antennas and blaming their poor TV reception (during the daytime when I was
in school) on my antennas. I suggested they contact the TV station and ask
their engineer if this was the case, just to be sure.
They called and later apologized. They commented to me that they had
installed the connector on the TV feed themselves and that when they moved
the TV it caused static. I offered assistance to install a new connector and
that took care of the problem for good.

Tim K3LR

-----Original Message-----
From: rfi-bounces@contesting.com [mailto:rfi-bounces@contesting.com] On
Behalf Of Rick Low
Sent: Tuesday, November 13, 2007 8:48 PM
To: rfi@contesting.com
Subject: [RFI] Non-transmitting tower causes RFI/EMI?

For the past year and a half my neighbor has claimed frequent interference
to his Kidde "Nighthawk" Carbon Monoxide detectors. While we've been able to
prove a few frequency/power combinations that definitely result in false
alarms, a majority of the "alarms" occur when I'm not transmitting at all!
The neighbor's claim is that my tower (and by extension, the yagi on it) is
somehow 'reflecting' another signal in the neighborhood and causing the
false alarms.
I've tried to explain the implausibility of the claim, and even tuned
through the HF spectrum during some of these false alarms, without finding
any signals that to me would obviously be strong enough to cause them. But
the belief remains in my neighbors' mind that I am the cause of the abnormal
occurrences in their house. My house is experiencing zero false alarms
during the same period.
So the question for the community: Is my neighbors' claim valid? How might I
go about helping to prove (or disprove) it?
Many thanks for your candid thoughts. 73 Rick N6CY/4
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