[RFI] Sources of wideband hiss

[nlsa at nlsa.com]

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 at starpower.net> 
Sent: Saturday, December 23, 2023 2:20 PM
To: Rfi List <rfi at 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 at nlsa.com
To: "Rfi List" <rfi at 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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