In message <[EMAIL PROTECTED]>, Bruce Griffiths writes: >Poul-Henning Kamp wrote:
>> Look at: >> http://phk.freebsd.dk/misc/L6/ >> >Nonsense, although it may work in favourable cases where the signal >levels arent too disparate, in the more general case this isnt true. Bruce, you are input-resistant, please read what I write: 1. I am not trying to solve the general case. 2. I am quite happy for it to work only in "favourable cases", because most people in the western hemisphere live close enough to a Loran-C for it to be a "favourable case". >Thats obviously fine for some Loran applications but you haven't >demonstrated that its also true when attempting to simultaneously track >another signal of interest that is relatively weak. Yes I have, but you seem to refuse to read it: http://phk.freebsd.dk/loran-c/CW/ >Thats only a 33 dB difference in signal level what happens when the >signal strengths differ by 60, 80 dB? Then we don't care to track them, because we will not be able to derive a sensible frequency signal from them. This is *not* an attempt to build a shiny complex, gold-plated contraption that can drag out a signal from half-way around the world in Hi-Fi quality, described as: >In which case a dedicated ST32M103 for Loran and another for >MSF/WWVB/JJYDCF77 etc is appropriate together with optimised analog >front ends, bandpass filters, notch filters and orientation of the >individual antennae to null strong interfering signals should cope with >most problematic sites. That's exactly all the stuff I'm trying to avoid. What I'll build is an <EUR100 single-chip receiver that will discipline an OCXO or Rb against the strongest Loran-C signal available. ... And make an excellent platform for experimenting with SDR on other VLF time/frequency signals. -- 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 -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.