From: "Dave Pick" <[email protected]>
Reply-To: [email protected]
To: <[email protected]>
Subject: RE: LF: Fuzzy lines
Date: Sat, 5 Nov 2005 23:18:12 -0000
Markus
Interesting. The frequencies are right. I could understand the Rugby one
because that's loud here but neither DCF39 nor Lessay are loud enough to
intermod locally so where does that product get generated?
Dave G3YXM
_____
From: [email protected]
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: 05 November 2005 22:04
To: [email protected]
Subject: Re: LF: Fuzzy lines
Dear Dave and LF,
this seems to be an intermodulation between DCF39 (abt 0.1Hz wide due to
the
data telegrams every 10s) and Loran C. The lines in you screenshot are
138830.03 - 142 * 50000 / 6731 = 137775.21 (Lessay, Soustons, Sylt, Rugby)
and
138830.03 - 158 * 50000 / 7499 = 137776.56 (Sylt, Lessay, Verlandet).
The latter one is a little surprising because Rugby does not appear to be
dual rated.
Laurence KL1X saw similar DCF ghosts in December 2003, which appeared every
time the path was open from Germany to Alaska. For a while we speculated
about possible ionospheric crossmodulation, but then Laurence confirmed
that
the spurs were caused by periodic triggering of his noise blanker on the
Pacific Loran pulses. We also found a faint hint of a Sylt + DCF39
combination in one of Alan's screenshots.
Hope this helps...
73 de Markus, DF6NM
In einer eMail vom 05.11.2005 21:03:36 Westeuropäische Normalzeit schreibt
[email protected]:
Dear all
Myself and Gary G4WGT both see these fuzzy lines on Argo. I seem to
remember
some discussion of their origin before but can't remember whether there was
a definite answer.
The come in at dusk and stay 'till dawn!
73
Dave G3YXM.
