Topband: RFI powerline ?

[David Olean]

Hello Andy,

It looks like some form of man made QRM, and not power line noise. I am 
very familiar with powerline noise, but our noise is at 120 Hz and yours 
will be at 100 Hz, 60 vs 50 Hz) so it should sound a lower pitch than 
what I am used to, but the waterfall display shows those evenly spaced 
groups of noise and that does not look like power line noise.

Dave K1WHS

On 1/11/2022 4:37 AM, Karel Matousek wrote:
> Hi Andy.
>
> I do have the same noises problem over here as you have.
>
> I found that it isn’t a 110 KV powerline noise, but probably a 
> broadband noise is coming from the direction 10 ° here in JO60OK. It's 
> very annoying. On the 800 meters US beverage (300°) the noise is S4, 
> but on my second stateside 4 EL bidirectional (330°/150°) broadside 
> K9AY array 84 meters apart uses the 0° hybrid combiners it is very 
> strong. It interrupts all night. At first, I thought it was a local 
> noise made by switching power supply. I’m so sorry, but I do not have 
> the beverage pointing directly to the north. During the day, the band 
> is clean, without noise, but when getting dark, the noise begins to be 
> heard and after midnight it is then very strong.
>
> https://drive.google.com/drive/folders/1DhkrxjaX0Mv171psVF4F_cfOHFB7hEX9
>
> Karel OK1CF
> ______________________________________________________________
>> Od: "Andree DL8LAS via Topband" <topband at contesting.com>
>> Komu: "topband at contesting.com" <topband at contesting.com>
>> Datum: 11.01.2022 09:21
>> Předmět: Topband: RFI powerline ?
>>
> Hey gentlemen,
> I have a powerline 110KV nearby my beverages....this is the sound in 
> AM, not strong but  also not good.Is this RFI normal from the line  or 
> is this  an insulator or another problem?Here you can see a short 
> video and hear the signal  from today.
> https://www.youtube.com/watch?v=Oue6JGBKzgg 
> <https://www.youtube.com/watch?v=Oue6JGBKzgg>
> 73 Andy DL8LAS
>
>
> www.dl8las.com
> www.swing-company-bigband.de/
> www.uni-big-band-kiel.de/
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