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Dear Dennis, LF,
thanks for the info!
Being curious, I observed the frequency last night
and noticed the mode change at 1:00. This was in fact coincident with
the onset of the broadband "Luxembourg" noise on my LF grabber.
A spectrum taken of the 177 kHz demodulated
audio confirmed the 41.67 Hz bands in the AM component of the multicarrier
DRM signal, which are then impressed symmetrically around the DCF39 carrier by
the nonlinear ionospheric effect.
This shows that a wide spread use of high
power DRM modulated transmitters could have a very significant negative impact
on the LF noise background.
Kind regards,
Markus, DF6NM
----- Original Message -----
Sent: Sunday, February 22, 2009 6:43
PM
Subject: Re: LF: Luxembourg effect caused
by DRM?
> A likely "heater" candidate
> would be
Zehlendorf 177 kHz, which has been reported in DRM mode after midnight
>
- could someone perhaps confirm the times of digital operation?
177kHz
DRM-Mode from 2:00 - 5:00 local time, which means of course 1:00-4:00 UT at
"wintertime" .
73
Dennis
DL6NVC
Berlin, 29km from Zehlendorf
TX Tower
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