Hi Michel, yes the noise is coming in by skywave from the east and so is
washed out by the approaching dawn. The signals from the west have a little
extra time because only the last ionospheric hop point at an altitude of
about 100km  needs to be in darkess.

Cheers de Alan G3NYK

----- Original Message -----
From: Michel F5WK <[email protected]>
To: <[email protected]>
Sent: 01 September 2006 17:09
Subject: LF: T/A wd2xes


> Hi all,
>
> Good copy of wd2xes from 0:00 to 5:30 UTC with a noticeable increase in
the
> S/N starting at 4:10 (2nd image)
>
> Atmospheric noise is a few dB higher during the night and interestingly
> decreases well before John's signal fades out.
>
> I increased the SL brightness of the second image to show this noise
> reduction.
>
>
> Receiving conditions:
>
> 2 x 2 meter one-turn copper loop with high Z differential preamp
> I/Q down converter, QSD based
> Audigy 2 ZX notebook sound card
> Spectrum Lab configured as SDR
>
>  73 Michel / f5wk   JN18HP
>
> --