The phone lineman use a tone generating device to trace a single line in a
bundle of pairs. They put a tone generator module (fox), rich in square waves,
at one end or one place in a building, and take the detector (hound) and sniff
all the wires at another part of a building. A strong howl coming from a pair,
even without touching the cable, can be detected. The stronger the signal on a
pair, the more likely you have the right one.

I've seen these units sold in some of the more well-stocked hardware stores.

Rick

Nelson Hochberg wrote:

> Okay,  I'm sure this was covered in Elect 101 while I was sleeping (which
> was most of the time since I thought the whole class was a review) but what
> is a fox/hound?
>
> > I had a friend that worked for the local phone company. He lent me his
> > fox/hound and I reversed engineered it. Here is the hound........
> >    (Fox is
> > also available if you need it.)
> > Rick
> >
> > Chris Wheeler wrote:
> >
> > > I just bought a kit to make my own F-Set, and I am having problems with
> > > the
> > > probe.
> > >
> > > Its basicly a 2N5484 FET followed by a bc549 feeding a LM386 amp which
> > > detects the signal radiated by a tone generator based on a pair of 555s.
> > >
> > > Does anyone have or know where I can look at a circuit diagram for a
> > > similar
> > > product?
> > > The kit has only a circuit diagram which does not match the parts or the
> > > PCB. Foolishly I assembled it by following the PCB, which may or may
> > > not be
> > > correct.
> > >
> > > --
> > > CW.
> > >
> > > --
> > > http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> > > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
> >
>
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> email listserv@mitvma.mit.edu with SET PICList DIGEST in the body

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body