Can a probe and tone generator trace cables behind a drywall

J

John Smith

Guest
Can they be used to trace cat 5 cables behind drywalls?
 
<< Can they be used to trace cat 5 cables behind drywalls? >>

John-

I don't see any responses to your question. I was hoping to see if there was
some easy way to do what you ask. Another similar approach might be to
generate an RF signal with some kind of "buzz" modulation, that could be picked
up by a portable radio. Maybe some kind of spark-coil vibrator would put out a
broad spectrum that could be picked up on any frequency at the low end of the
standard AM broadcast band.

I believe I have heard of some kind of equipment that does what you want, used
by electricians. You might ask about it in the electrical department of one of
the builder supply stores or stores such as Lowes or Home Depot.

Fred
 
In article <PdfSc.2257$Po1.400@trndny08>, John Smith <user@example.net> wrote:
Can they be used to trace cat 5 cables behind drywalls?
I didn't see any replies either, so I just checked it. My conclusion is
that if the cable is touching the drywall on the other side from you,
you'll hear it fine. If, however, it's the full 3.5" away that it might
be (assuming a 2x4 behind the drywall), tracing it will be a much more
questionable proposition.
 
Terran Melconian wrote:

In article <PdfSc.2257$Po1.400@trndny08>, John Smith
user@example.net> wrote:
Can they be used to trace cat 5 cables behind drywalls?

I didn't see any replies either, so I just checked it. My conclusion
is that if the cable is touching the drywall on the other side from
you, you'll hear it fine. If, however, it's the full 3.5" away that
it might be (assuming a 2x4 behind the drywall), tracing it will be a
much more questionable proposition.
here is one:
http://www.testequipmentdepot.com/AEMC/CableTesters/tr02.htm
 
"John Smith" <user@example.net> wrote in message
news:pdfSc.2257$Po1.400@trndny08...
Can they be used to trace cat 5 cables behind drywalls?
First off, you should've asked thie on the more appropriate
comp.dcom.cabling newsgroup.

Cat5 cabling is so tightly twisted that if you connect the toner to a
single pair, you'll get nothing when the probe is right next to it. So
you have to connect one wire of the toner to one pair or one wire of one
pair, and the other wire of the toner to another pair or wire of another
pair. Try it and you'll see what I mean.

I have one probe that has a volume control and can be turned up, so it
will make enough noise to detect fairly far away - some probes don't
have a volume control. But it depends on what's around the cabling, how
new the battery in the toner is, etc. The toner will operate on a
battery that's down to just a few volts, so check it occasionally with a
DMM and replace it when it's below 7.5V.
 

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