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Dave Brown wrote:
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<font face="arial,helvetica"><font size=-1>From
Cesare I5TGC:</font></font>
<br><font face="arial,helvetica"><font size=-1>> The Signal you receive
is like a telephon call, some old systems use a 25 Hz a.c.</font></font>
<br><font face="arial,helvetica"><font size=-1>> with one second duration
and 4 seconds space. Nevertheless it is very difficult</font></font>
<br><font face="arial,helvetica"><font size=-1>> that these signals can
reach your receiver.</font></font> <font face="Arial"><font color="#000000"><font size=-1>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.</font></font></font><font face="Arial"><font color="#000000"><font size=-1>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.</font></font></font><font face="Arial"><font size=-1>73</font></font><font face="Arial"><font size=-1> Dave</font></font><font face="Arial"><font size=-1>ZL3FJ</font></font></blockquote>
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