> 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 













> Another "mystery" noise band sometimes appears at night, about 200 Hz wide
> centered on 137.07 kHz, and of easterly origin (red):
> http://www.alice-dsl.net/df6nm/test0902210100.png
> In this capture, there is also a weaker replica of this band centered on
> 137.19 (north, violet). This combination would suggest Luxembourg effect on
> both HGA22 (east) and DCF39 (north), caused by a common heater carrying
> 1.64 kHz AM modulation. However I have no clue to what the source is, and why
> it would carry such an unusual modulation spectrum.
> 
> Kind regards,
> Markus, DF6NM

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