Thanks Rick,

I actually installed telephones about ten years back and used those things.
We called them signal or line tracers though.


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Rick C.
> Sent: Wednesday, August 28, 2002 11:37 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]:F-set or Cable tracer
>
>
> 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.
> > > >
> > > > --
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