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LF: DLF splatter gone (for good?)

To: [email protected]
Subject: LF: DLF splatter gone (for good?)
From: [email protected]
Date: Thu, 27 Dec 2001 17:21:52 EST
Reply-to: [email protected]
Sender: <[email protected]>
Hi Bernd, Ko and Uwe,

the annoying spurs centered on 137 kHz had reappeared in the morning of Dec 16th. They suddenly went away at 19:00 UT when power was switched down from the daytime level of 500kW (i.e. both transmitters) to 250kW (single TX), but were back in the next morning. After a telephone call on Dec. 17th, the engineers in Donebach apparently were able to solve the problem. A few hours later, the interference was completely cleared, and I have not heard it since.

The modulated noise bands in the spectrogram sent by Ko exactly look like those I have seen here, though I was surprised about the strength at that distance. What time did you take that image?

Uwe's observation on Dec. 22nd may be related to the familiar Luxembourg effect, i.e. ionospheric heating impressing the programming of DLF (and others) onto the carrier of DBF39. During many nights, the modulation depth appears to reach a level of 1% to 4% here, equivalent to a sideband power of a few watts.

Regards
de Markus, DF6NM


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