Hi Alan and all,
Second there is a very consistent wide dip in signal which has
occurred with a minimum within a few minutes of 1500z every day. (No I dont
think it is the tea-break time at the TX site! the dip is about 10dB and
the
signals takes about 20mins to decline and another 20 mins to return)
This sounded just too curious, so I took a look. Well, the little spectrogram
(26.02.01, 14:25..15:25, 10.8 Hz, 30 s, +12..+42 dBuV/m) suggests the drop
from 14:49 to 14:53 is abrupt and actually a man-made effect.
Fs this afternoon was around 34 dBuV/m, and tx frequency is not absolutely
stable, notice the half-pixel drift upwards before the break.
73 de Markus, DF6NM
|
