Hi John and all,
unlike Loran, those DCF42/49 intermodulation frequencies do not spread all
over the band. I have observed discrete lines only in the region 135.48 to
135.61 kHz, which corresponds to n = 0...5 in the formula (136547.5 +- n *
11.42) Hz, plus a fair bit of broadband noise below 136.7 kHz. Also, here at
160km they are constant to within a dB or so, whereas 137689.6 fades from
typically -8 dBuV/m right down to invisibility. Wonder what corner of the
globe it actually comes from...
73 de Markus, DF6NM
The line reported at 137689.6 would fit:
2*f(DCF49) - (fp-fd) +- n(fd/104), with n = 204 to within 0.3Hz,
according to the formula you supplied to me at the end of last year.
It is not a Loran line.
73 John, G4CNN
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