At 14:16 30/12/00 Saturday, Markus wrote:
................Which of course brings up the matter of Loran lines.
At my qth, I do see some
in the upper part of the band, but below 137 kHz the noise appears to be
higher, and they are quite faint if visible at all. Looking around in the
neighbourhood of 100.0 kHz revealed three sets with periodicies of 5.5, 6.7
and 7.5 Hz.
They happen to peak around 137 kHz for some reason. A spectrum plot
will show a dip around 125 kHz and a tail-off after 141 kHz.
Are your periodicities right? Your local Loran is Sylt which double-rates
at GRI 67310 uS (14.856633 Hz) and 74990 uS (13.335111 Hz)
presumably giving you the "7.5" and "6.7" sets you mention.
The third one "5.5" is about 11 Hz if doubled and corresponds to
GRI 90070 (11.102476 Hz) which has a station at Vaerlandet
(near enough Bergen) probably the one you see.
They all switch phase between successive GRI's - maybe
this is having an effect.
Walter G3JKV.
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