Dick Rollema schrieb:
To All from PA0SE
Already several days I suffer from terrible broadcast QRM on the LF-band.
It sounds like Luxemburg effect centered on DC39.
It is so bad that this morning I could hardly read M0BMU on 137.4kHz where
I tried to measure his field strength and reporting back with my 1944
Hellschreiber. Jim always has a strong signal, about S8, and the test
failed completely due to the BC-QRM.
I experience it on both the Teletron LWF45 LF receiver and the W & G SPM-12
selective level meter I used for the measurement.
The LWF45 has excellent front-end selectivity (5 tuned circuits tracking
the local oscillator) so it can't be cross- or intermodulation by a strong
BC-signal.
The only other cause I can think of is some "rusty bolt" effect that has
recently developed.
Do others have the same problem?
73, Dick, PA0SE
Hi Dick,
in the northern part of DL nothing. on 137.4kHz is DCF48 with an unintended
radiation ZOA. if taking DCF39 in zero beat I can hear the BC
station Deutschlandfunk (153kHz, Braunschweig) loud and clear.
regards
Uwe/dj8wx
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