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ZL3AI > APRDIG 16.03.04 13:05l 166 Lines 6485 Bytes #999 (0) @ WW
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: RE: Question for the group... Solid wire vs Stranded
From: "Daron J. Wilson" <daron@wilson.org>
Date: Sun, 14 Mar 2004 19:43:04 -0800
X-Message-Number: 13
What exactly is your question? If you are referring to type 66 blocks
or punch down blocks, then yes, they are an IDC (Insulation Displacement
Connector) and as such are designed for a narrow range of solid wire
size. They are not designed for stranded wire. Using solid conductor
wire in an application where the is flexing or movement of the cable
tends to create a fatigue failure.
I guess...what is it you specifically want to know?
Daron J. Wilson, RCDD ) )
Telecom Manager ( (
LH Morris Electric, Inc. ) )
(541) 265-8067 office _|****| mmm!
(541) 265-7652 fax ( | | coffee!
(541) 270-5886 cellular \| |
daron.wilson@lhmorris.com |____|
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Subject: Re: Question for the group... Solid wire vs Stranded
From: Brian D Heaton <bdheaton@c4i2.com>
Date: Sun, 14 Mar 2004 22:54:58 -0500
X-Message-Number: 14
Maybe because the finer strands won't weaken and break with repeated
flexing? Also, if a few do break you've got others left to carry the
load.
73/N5VFF
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Subject: Re: High speed data
From: "Steve Slay - KC5MVY" <snslay@swbell.net>
Date: Sun, 14 Mar 2004 21:55:27 -0600
X-Message-Number: 15
A picture is worth a thousand words. Less time explaining something
verbally from the WX service to a spotter in the field leaves more air time
for the spotter to report to the WX service the information they need about
a storm. The same thing is true for using APRS when spotting. If the WX
service can see on a map where a spotter is, there is no need for the
spotter to take air time explaining his location verbally.
Steve Slay
KC5MVY
"Only two things are infinite, the universe and human stupidity, and I'm
not sure about the former." Albert Einstein
----- Original Message -----
From: "Doug Younker" <dougy@ruraltel.net>
>Wouldn't the spotters be better employed spotting? They are the only "real
>time " observers of weather events.--73
>Doug, N0LKK
> dougy@ruraltel.net
----------------------------------------------------------------------
Subject: RE: Question for the group... Solid wire vs Stranded
From: "Mike Yetsko" <myetsko@insydesw.com>
Date: Sun, 14 Mar 2004 23:09:26 -0500
X-Message-Number: 16
>What exactly is your question? If you are referring to type 66 blocks
>or punch down blocks, then yes, they are an IDC (Insulation Displacement
>Connector) and as such are designed for a narrow range of solid wire
>size. They are not designed for stranded wire. Using solid conductor
>wire in an application where the is flexing or movement of the cable
>tends to create a fatigue failure.
>
>I guess...what is it you specifically want to know?
OK... I have an application that I recommend stranded wire with special
'wipe type' connectors that have a special crimp for the stranded wire
used. Wires are 'signal wires' and depending on application can be up
to 2400 feet.
However, there's an existing installation that is, shall I say...
'troublesome', that was built with the 66 punchdown blocks, and
wired with old 4 line solid (non-twisted) telephone wires. This
installation only gets minor flexing of the wires. But it get a
TREMENDOUS amount of vibration.
Problem is, I'm up against the 'it's already installed and working'
attitude, even though it isn't really.
Now, years ago I used to have references from AMP and others
about the 'gas tight' seals that certain connectors used to have as
their basis, and I remember vibration was one of the disqualifiers
for that type of connector. I also used to have references to what
kind of wires were recommended and what type of connectors
for different environments.
But I"m pickled in beet juice if I can find any references now.
I thought it would be easy to find on the web, but not so. Found
some decent info on the Leviton site, but not as explicit as I wanted.
Seems that all you can find now is just how it relates to wiring
10bt or 10/100 Ethernet, or what kind of RJ-45 crimp ons to use.
Mike
----------------------------------------------------------------------
Subject: Re: Question for the group... Solid wire vs Stranded
From: "John Langtry, VE3NEC" <ve3nec@sympatico.ca>
Date: Sun, 14 Mar 2004 23:44:29 -0500
X-Message-Number: 17
Hi Mike,
Just like Daron, I'm a little confused with your question.
The "66" or the even the smaller "BIX" Telco blocks are designed for soild
wire only; wire which has little, if any movement.
On the other hand, if the wire will have "movement", take for example your
telephone's set cord or hand set cord, it's stranded - and a totally
different connector - that will *not* work with "punch down" connectors, of
any form that I am aware of.
Taken to the extreme, several generations ago, our switching machines, were
"Step by Step" (meaning movement for each number dialed). Here in these old
"Steppers", the "wire" was tinsel foil on a piece of insulated string.
These "wires" would move several million times, before they failed. (These
have *long* passed into history, at least at Bell Canada. We're totally
digitial now.)
But in your case, a seconday rotator, your application definately calls for
the use of "stranded" wire, if I understand your question correctly. (But
I've yet to see a "rotator" with "punch blocks" !)
Most of these use "screws" for each lead, and the temptation is to "tin"
the stranded leads before they go under the screw. Sure looks neat, easy to
work with and all ... but your point of failure will be were the stranded
leads are made into one, via soldering.
There are connectors out there, which take stranded lead, to a "screw"
fitting, btw.
Oh, and as to your RJ-11 (telephone) or RJ-45 (data) all of these are made
to (normally) take stranded lead, assuming motion. However we do use a
special RJ-45 for soild-core wire (routers and edge switches) where there
is virtually no "motion" of the cable.
I could site several BSP's or BCP's on topic; Snag, these are not available
on the "web", as they are condsidered "proprietary" to the telephone
companies, in both our countries.
vy 73 de John VE3NEC
905-873-8715
(31 years of Service, and counting)
---
END OF DIGEST
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