Hi, The Allouis phase modulation is as follows : - sawtooth phase shift of the 162kHz carrier with 40rad/sec slope => +/- 1 rad shift => +/- 6,36Hz carrier frequency shift - sequence of full sawtooth periods of length 100msec => frequency 10Hz - one full period sawtooth codes a « 0 » bit - two full periods sawtooth code a « 1 » bit - One bit only is coded per second in each minute => 59 bits available because... - 59th second is silent (no phase modulation)
Gilles. > Le 5 déc. 2018 à 16:27, Poul-Henning Kamp <[email protected]> a écrit : > > -------- > In message <[email protected]>, Magnus > D > anielson writes: > >> Looking at it using a Kiwi receiver just north of Stockholm, it comes in >> nice and clean with 100 Hz sidebands from what looks like a PM whose 4th >> sideband is nearly suppressed, so is 8th, 12/13, 21... so slightly more >> that 4th and multiples. > > It looks like both 162 and 198 has gotten more modulation after > Loran-C disappeared, and I wonder if submarines are involved ? > >> The Loran-C/Chayka plug-in does not calculate position, so already there >> would be some fun little mini-project to attempt. > > If only there were some Loran-C stations left :-) > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > [email protected] | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
