Hi There are dog collar systems that work the same way as well as low speed data over power line systems. For what ever reason - they really like to create RFI. My guess is that it’s easy to generate a pulse with logic gates than it is to properly filter that pulse.
The first question I’d have about the gizmo is: does it really *need* that awful looking square wave? I’d bet that the “antenna” in the lawnmower is a tuned loop of some sort. It probably would be happy with a much less wide band signal. I’ve had good luck with the buried dog fence setups and some pretty basic filtering. Of course this all works ok for your system. You have to be on very good terms with the neighbors to fix the problem from their system …. Bob > On May 9, 2015, at 8:15 AM, Poul-Henning Kamp <p...@phk.freebsd.dk> wrote: > > I spent some time capturing some data today. > > The measurements is from my $20 loop-antenna in the attic, which is > something like 8 meters up and 10 meters besides the lawn-mower loop: > > http://phk.freebsd.dk/time/20150509.html > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > p...@freebsd.org | 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. _______________________________________________ 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.
