[TowerTalk] noise profiles...

[Ken K6MR]

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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