On Jul 5, 11:00*pm, "J. Clarke" wrote:
On 7/5/2010 9:47 PM, Joseph Gwinn wrote:





In ,
* "DoN. *wrote:

On 2010-07-05, Joseph *wrote:
In ,
* "DoN. *wrote:

On 2010-07-04, Joseph *wrote:

* * * *[ ... ]

we used AMP tooling and connectors. *Anyway, problem solved, almost
overnight.

* * * *Hmm ... various styles available. *I've got two which could do
the job.

* * * *The first one does a separate crimp for the shield termination
and for the center conductor pin. *This is more likely to be used for
BNC style connectors.

* * * *The other crimps both the shield and the center conductor at the
same time. *There are two small windows which the crimper reaches in
through to crimp the center conductor. *But these are normally for
insert coax pins to go in block terminals -- and D-series connectors
like the 13W3 used by Sun for monitor connections. *(I have been looking
for the connector inserts for a long time -- just to have a few which
work with that crimper. :-)

I used what the department had available, and any AMP crimp system was
going to
solve the problem.

* * * *Indeed -- if you had both the right crimp tools and terminals.
I tend to have crimpers for terminals which I've never found, and
vice-versa. :-)

This was in a big company, so we by chance did have a matching set for RG-58.

* * * *Have you ever worked with the shield termination ferrules used
for daisy-chaining a bunch of shields together and ending with a
standard insulated wire to get a crimp-on pin for going into a block
where the shields are not truly coax, but rather things like shielded
twisted pair for low level signals but not RF frequencies?
is the 59000 IIRC, with a whole series of interchangeable dies for

Never had the pleasure.

* * * *Particularly beats having to unweave the braid, twist it into
tails, slide on insulation, and the solder (or crimp) to pins in the
connector. *Particularly when there are a half-dozen shields to be
terminated in one pin. :-) Each ferrule has two bulges (pre-crimping) to
accept two wires -- either out the back along the jacketed wire or out
the front to the connector pins.

But I do recall a problem in the late 1970s when a coax-cable computer link
between buildings stopped working, even though there was continuity.
Turned out
that an electrician had cut the cable (don't recall if accidental or not)
and
spliced it back together with a pair of small wire nuts. *The data signals
bounced right off that impedance step. The poor man did not understand why
we
were laughing so hard, but sensed that he was somehow involved.

* * * **Big* smile!

* * * *Yes, I can imagine him not understanding it at all. *He works
with 60 Hz, and no runs long enough to be near a quarter wavelength or
anything else significant. :-)

* * * *The ohmmeter says it is good -- so it must be good. :-)

We did not try to explain it to him. *It would be a magic show at best/

I have had the need to explain such things to other electricians, and gotten a
big fight for my trouble. * A person who does not know what he does not know, or
even that there are such things.

That's one thing that bugs me about the State of Connecticut, one _must_
have an electrician's license to work on network cables. *Never seen an
electrician with said license yet who could identify a cable scanner,
let alone who owned one,.- Hide quoted text -

- Show quoted text -

NJ has an extortion scheme where you can "apply" for an exemption for
low-voltage network & telecom wiring. This self-certification costs
$120. In over 30 years of doing this work, nobody has ever asked me
for a certificate. Maybe I'll get one someday.

Regarding Iggy's original post about the crimper - there is simply no
excuse for not doing it right. The tools are expensive, but having the
right crimper for the right terminal for the right wire is the ONLY
way to ensure a reliable termination. "Pulling" on the terminal after
crimping is pretty subjective. When I was in production engineering,
we spent a lot of time and money measuring crimps with specialized
micrometers and pulling on them with calibrated scales.

OTOH, when I was at AT&T, I was impressed by the union electricians I
worked with on DSLAM installations. They had the right tools for the
job and knew how to use them, in contrast to some of the equipment
they were installing, some of which had crimps that looked like they
were done with vise-grips.