[TowerTalk] noise profiles...

[Patrick Greenlee]

Since the basement is "blacked out", dawn to dusk is defined by the 
timer switch being used not by local time or time of sunrise or...   So 
the time on and off of your noise has no connection with "real daylight" 
dawn to dusk or an approximation of same. Just look for a repetitive on 
off time and maybe a duty cycle of about 12 hrs on and 12 hrs off.

Patrick        NJ5G


On 1/9/2017 9:41 PM, Steve Jones wrote:
> 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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