[Lf] [Fwd: LF: More Info? - Re: Strange signals on 25 Hz (!) - any info ?]

[Andre Kesteloot]

Dave Brown wrote:

> From Cesare I5TGC:
> > The Signal you receive is like a telephon call, some old systems use
> a 25 Hz a.c.
> > with one second duration and 4 seconds space. Nevertheless it is
> very difficult
> > that these signals can reach your receiver. Not difficult to hear if
> someone has a PABX not far from the ELF antenna- and the bigger the
> antenna then probably the further away it can be.I can hear the
> ringing from my own PABX (with a similar mark/space ratio to that
> described) from ELF all the way up through most of the HF range on a
> variety of antennas and receivers.73 DaveZL3FJ



-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://atanasoff.rf.org/pipermail/lf/attachments/20020622/d40327d1/attachment.html