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Gary, LF,
Anthorn is designated "6731Y", which says
that it is running a pulsegroup repetition interval (GRI) of 6731
carrier periods (ie. 67.31 milliseconds). There is a phasecoding
scheme that alternates phases on every second pulsegroup, thus the
periodicity is really 2x GRI. So all the spectral lines are precisely at
multiples of
100 kHz / 2 / 6731 ~ 7,4283167434
Hz.
Lessay is running dual-rated on both 6731 and
7499, so it has an additional set of lines with 6,6675556741 Hz spacing.
During the night, you might also see much weaker lines from Ejde on GRI
9007.
Best 73,
Markus (DF6NM)
Sent: Friday, October 21, 2011 4:37 PM
Subject: LF: Anthorn UK, Loran.
Hi All,
Can someone give my the formula for calculating the spot frequencies of
Loran as generated by Anthorn, UK.
I am testing a uHz SpecLab display using Stefan's 137kHz soundcard receiver
& I am seeing lines which don't match with my old spread sheet calculator. I
need to know if they are Loran or something generated locally. The lines are
very straight so its difficult to judge.
Or, if anyone has a better idea I am open to suggestions.
73, Gary - G4WGT.
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