[RFI] Sources of wideband hiss

[nlsa at nlsa.com]

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 at yahoo.com> 
Sent: Saturday, December 23, 2023 5:51 PM
To: 'Rfi List' <rfi at contesting.com>; nlsa at 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 at nlsa.com <mailto:nlsa at 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.

 

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