Dear Jim –
It’s just a general rise in the noise floor, as if you turned the audio volume
up. It sounds like noise; perhaps “hiss” is not the best word to use.
Michael
From: AA5CT <jwin95@yahoo.com>
Sent: Saturday, December 23, 2023 5:51 PM
To: 'Rfi List' <rfi@contesting.com>; nlsa@nlsa.com
Subject: Re: [RFI] Sources of wideband hiss
Q: What mode are you using to note 'hiss'?
Can I ask whey you hear in AM mode, IOW, 'envelope detection' mode (vs say,
SSB)?
de AA5CT Jim
On Saturday, December 23, 2023, 1:14:01 PM GMT-6, <nlsa@nlsa.com
<mailto:nlsa@nlsa.com> > wrote:
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.
_______________________________________________
RFI mailing list
RFI@contesting.com <mailto:RFI@contesting.com>
http://lists.contesting.com/mailman/listinfo/rfi
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|