[TowerTalk] noise profiles...

[Steve Jones]

We have a cousin who is legally growing in a legal state.  He says he has his lights on roughly 12 hours a day in his blacked-out warehouse, to simulate dawn-to-dusk sunshine year-round.  So if the timing of the noise is roughly dawn to dusk, it could well be grow lights.

73,
Steve
N6SJ


-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of StellarCAT
Sent: Monday, January 09, 2017 4:20 PM
To: tower
Subject: [TowerTalk] noise profiles...

Hello ... I know there is a group for this ... but I also know there are guys on here SERIOUS about DXing and/or contesting that have had to work on these issues so I’ve brought this here to see what responses I can get. 

Two questions: 

what would the spectrum profile be for a ‘grow’ farm? 

and 

for a plasma TV? 

I have this noise that is there most every night – and goes away at some point in tot the night. It is broad – about 36Khz wide as seen on NaP3 panadapter ... it looks like a crater cut in profile through the center with a long raised yet flat area that is about 3-4 db above the noise floor (non-interference part of the band) ... and at each end there is an upturn in the noise that peaks as high as 12db above the noise floor with a pretty sudden drop off back to the normal noise floor. It moves a bit from night to night – it can be as high as 3515 Khz or so (bottom at ~3480) or as ‘low’ as 3505 at the high end ... AND it appears as well at the bottom of 160 around 1810 or so! 

I just checked where it was tonight and it is actually much wider tonight going from 3470 – 3530 ... so ±30Khz and at the center there is a peak! Likewise tonight on 160 it is at 1856 – 1888 with the same center peak. 

Could this be a plasma TV? It is quite evident as noted peaking in one direction as seen while using the HiZ 8 element receive array (dual 4 sqs). 

I had this in TWO different directions .... and one of them went away around Xmas time and so far hasn’t returned! I had hoped this might happen ... but the other one is still there.  

Any suggestions would be appreciated. 

Gary 
K9RX

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