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[RFI] Local Noise Environment

To: topband@contesting.com, rfi@contesting.com
Subject: [RFI] Local Noise Environment
From: Pete Smith <n4zr@contesting.com>
Date: Sat, 14 Feb 2004 10:13:20 -0500
List-post: <mailto:rfi@contesting.com>
I am trying to figure out my local noise environment and understand what (if anything) I can do to correct it.

On my shunt-fed tower, in daytime, the S-meter on my Mark V (which is extremely generous below S9) reads a steady S9 +10 with the radio in USB mode and the standard filters in use. Switching to a K9AY loop 350 feet away from the tower (with a 20 dB preamp) drops the level of the noise to S7-8. I have listened to the noise in both USB and AM positions, and do not hear the 60 Hz AC arc sound that I have gotten used to in my efforts to track down power-line noise.

I can't rotate the loop, so I tried listening on 80, where I have a 4-directional K3LR-style lazy-vee array, and the noise definitely peaks, by a few dB, in one direction, and is materially lower in the opposite direction (the array has a wide forward lobe but pretty substantial F/B ratio).

I can make some recordings if anyone with an expert ear thinks hearing it would be useful.

73, Pete N4ZR
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