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Re: [RFI] Fwd: Power Line Noise

To: rfi@contesting.com
Subject: Re: [RFI] Fwd: Power Line Noise
From: "Dave (NK7Z)" <dave@nk7z.net>
Date: Tue, 31 Dec 2024 07:31:40 -0800
List-post: <mailto:rfi@contesting.com>
You took the words from my mouth Jim...  I was going to suggest just that.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources


On 12/30/24 14:43, Jim Brown wrote:
Given the aural analysis from other experts Mike Martin and David Eckhardt (I don't remember seeing a file posted, only a screen shot), this is great advice.

I'll add a specific method I use for impulse noise here in the Santa Cruz Mountains, where homes are a bit spread out. My mobile VHF/UHF FM rigs and talkies have wideband RX from below the AM BC band to about 560 MHz, with the options of SSB and AM detectors. I have both the mobile rig and the talkie programmed for 160 MHz, 300 MHz, 400 MHz, and the highest freq it will tune.

I drive around tuned to 160 MHz; as the signal gets stronger, I move up in frequency. When it's loud at the highest frequency, I get out of the car with the talkie, first with a duck and the talkie held tight against my belly, turning it into a half-space antenna. As I get closer, I remove the duck. And so on. I learned the talkie against the belly trick from our Chicago club's annual fox hunts, and one year won using only that.

73, Jim K9YC

On 12/30/2024 1:34 PM, Alan Higbie wrote:
Perhaps it fades off higher in the band (in the phone portion) because your
antenna is more responsive down in the CW segment?

Do you know what direction it's coming from? Try peaking it with your beam.
It may be a sharper peak on higher band - like 10 meters.  I'd also try
using your 6 meter and 2 meter beams to do the same in that direction for
possibly even sharper peak. (set to receive on AM)

Then take a handheld VHF /  UHF radio (on AM) and walk out in that
direction until you find the pole where it is strongest.  That may provide some further clues as to exactly which pole is the source. After all . . .
there is some specific source out there causing the problem.

Knowing which pole is the source, will help your power company crew fix it
faster.

Please keep us posted.  That way, we all benefit.

73,

~ Alan K0AV

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