Michael,
Its not adequate to determine the direction of the RFI, that phase of
investigation is not complete until you determine the location of the
RFI source. A small 2 meter antenna and hand portable radio will
do that easily
73
Frank
W3LPL
----- Original Message -----
From: nlsa@nlsa.com
To: "Frank W3LPL" <donovanf@starpower.net>, "Rfi List" <rfi@contesting.com>
Sent: Sunday, December 24, 2023 2:59:00 AM
Subject: RE: [RFI] Sources of wideband hiss
Dear Frank,
I have already taken both of these fundamental steps. I know the direction
from which the noise is coming; my question to the list was, " What are some
sources of wideband hiss?" What is the mechanism for creating it? If I know
(approximately) where it is coming from, what kind of device should I keep an
eye out for? I'd like to understand the problem.
W9IP
-----Original Message-----
From: Frank W3LPL <donovanf@starpower.net>
Sent: Saturday, December 23, 2023 2:20 PM
To: Rfi List <rfi@contesting.com>
Subject: Re: [RFI] Sources of wideband hiss
Like all other RFI, the first steps are
1. turn off all AC power in your own home and turn off all UPSes. If the
noise disappears, you can use your circuit breakers as a next step in isolating
the RFI source
2. If that fails, use a small directional antenna and hand portable radio to
determine the location of the source
Guessing the source is rarely useful
73
Frank
W3LPL
----- Original Message -----
From: nlsa@nlsa.com
To: "Rfi List" <rfi@contesting.com>
Sent: Saturday, December 23, 2023 7:09:53 PM
Subject: [RFI] Sources of wideband hiss
Dear friends,
What are some sources of wideband hiss? I'm talking about an unstructured,
apparently unmodulated many-dB increase in the noise floor across the 2m
band* No associated birdies or other noticeable signals, just a nasty hiss.
I see it in the direction of high-voltage power lines 2km away and also toward
a couple of houses I just a few hundred meters distant. The mechanisms of
those sources are not necessarily the same of course. Ideas welcome.
Best regards,
Michael
*I don't know whether it affects other HF or VHF bands.
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