And remember the nulls off the side of the array are deeper and far better
defined than the forward peak lobe.
Dave - W ØLEV
On Sun, Dec 24, 2023 at 3:43 AM Frank W3LPL <donovanf@starpower.net> wrote:
> 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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>
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>
--
*Dave - WØLEV*
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