If it is wide band, but not "all over the entire band,", it's probably
not atmospheric noise, more likely created by humans [i.e. your
neighbors]. Especially if it drifts up and down slowly.
Odds generally are that it's correlated with the slowly increasing use
of LED and CFL lights ... and possibly increases in "indoor
agriculture." The latter can generally be identified by a fairly strict
schedule of on and off. I have one near me. :-)
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org
On 7/23/2015 5:07 PM, w...@msn.com wrote:
Has anyone else noticed the dramatic increase in atmospheric noise
lately? On 20M, 30M, and 40M especially, I see a wide-band noise source
wandering back and forth across the bands. At times it almost looks
like a sine wave on the waterfall display. The noise will vary from an
S3 up to a 20/S9. It is especially troublesome on the frequencies I
use most, namely, 10.1389, 14.045, 14.070, 7045, and 7070. With the
antenna disconnected, the noise drops to S1 or less.
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