[TowerTalk] noise profiles...

[Al Kozakiewicz]

If you are growing something indoors that's illegal, it is fair to assume that it is in a place where there is no exposure natural light and prying eyes. In which case you would need 12 hours of artificial light each day.  More is OK if you only want the vegetation and not the flowers, but at least 12 hours nevertheless.

Two sources of noise in my own house with similar patterns of incidence were discovered only after I bought one of those MFJ jobbies, purchased because I was 100% sure the noise was coming from outside. A flat screen TV (not plasma or LED) and the dishwasher. Drove all around the neighborhood one night and found nothing, but discovered the two culprits within 5 minutes of returning home.

Al
AB2ZY
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From: TowerTalk <towertalk-bounces at contesting.com> on behalf of Ken K6MR <k6mr at outlook.com>
Sent: Monday, January 9, 2017 8:08 PM
To: StellarCAT; tower
Subject: Re: [TowerTalk] noise profiles...

There is some good info at www.w0qe.com<http://www.w0qe.com> . I’ve got something similar (new in the last 2 months) at 1815. I’m in the midst of building a receiving loop to locate it. On in the late afternoon, off around midnight – 2AM.



I only have a couple of neighbors within a ½ mile so my job should be relatively easy. Getting someone to cooperate is a different story. One neighbor is a known grower (busted a couple of years ago) so he might be back at it indoors.



Ken K6MR



From: StellarCAT<mailto:rxdesign at ssvecnet.com>
Sent: Monday, January 9, 2017 4:20 PM
To: tower<mailto:towertalk at contesting.com>
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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