Today's Message Index:
----------------------
1. 01:21 AM - Re: Connecting Shielded Cable to DB-25 (Sebastien)
2. 01:25 AM - Re: Connecting Shielded Cable to DB-25 (Sebastien)
3. 05:12 AM - Re: Connecting Shielded Cable to DB-25 (Art Zemon)
4. 05:13 AM - Re: solder splices (bob noffs)
5. 05:40 AM - Re: solder splices (Robert L. Nuckolls, III)
6. 04:58 PM - Re: solder splices (bob noffs)
Message 1
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Subject: | Re: Connecting Shielded Cable to DB-25 |
I would connect the shield to ground at the wing tip end Art, not at the win
g root end.
Sebastien
> On Sep 27, 2016, at 03:05, Art Zemon <art@zemon.name> wrote:
>
> Folks,
>
> I need to connect a shielded cable to my DB-25 connector and I need some a
dvice about how to physically construct this. Here is the wiring diagram
> =8B
> strobe position lights.pdf
> =8B
> I am concerned with the construction of wires LIGHTS-1-C and LIGHTS-1-D at
the wing root. Specifically, the center conductor of the cable is to be con
nected to a pin in the DB-25. The shield is to be connected to a local groun
d. This connector (when operating) will be inside the tubular spar of my Bed
e BD-4C, so the whole assembly will be well shielded; I'm not worried about h
ow many unshielded inches I have near the DB-25.
>
> This is what I think will work: Strip the outer insulation of the shielded
cable back several inches, so that I can separate the shield from the cente
r conductor outside the DB-25 housing. Solder a sufficient amount of wire to
the shield so that I can work with it and attach it to the local ground. Ru
n the center conductor to the DB-25 and connect it to a pin just like any ot
her wire.
>
> Your thoughts?
>
> Thank you,
> -- Art Z.
>
> --
> https://CheerfulCurmudgeon.com/
>
> "If I am not for myself, who is for me? And if I am only for myself, what a
m I? And if not now, when?" Hillel
Message 2
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Subject: | Re: Connecting Shielded Cable to DB-25 |
Whoops, disregard last message, I see you are talking about the wire from th
e cabin. Any reason you can't just ground it at the switch?
Sebastien
> On Sep 27, 2016, at 03:05, Art Zemon <art@zemon.name> wrote:
>
> Folks,
>
> I need to connect a shielded cable to my DB-25 connector and I need some a
dvice about how to physically construct this. Here is the wiring diagram
> =8B
> strobe position lights.pdf
> =8B
> I am concerned with the construction of wires LIGHTS-1-C and LIGHTS-1-D at
the wing root. Specifically, the center conductor of the cable is to be con
nected to a pin in the DB-25. The shield is to be connected to a local groun
d. This connector (when operating) will be inside the tubular spar of my Bed
e BD-4C, so the whole assembly will be well shielded; I'm not worried about h
ow many unshielded inches I have near the DB-25.
>
> This is what I think will work: Strip the outer insulation of the shielded
cable back several inches, so that I can separate the shield from the cente
r conductor outside the DB-25 housing. Solder a sufficient amount of wire to
the shield so that I can work with it and attach it to the local ground. Ru
n the center conductor to the DB-25 and connect it to a pin just like any ot
her wire.
>
> Your thoughts?
>
> Thank you,
> -- Art Z.
>
> --
> https://CheerfulCurmudgeon.com/
>
> "If I am not for myself, who is for me? And if I am only for myself, what a
m I? And if not now, when?" Hillel
Message 3
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Subject: | Re: Connecting Shielded Cable to DB-25 |
On Mon, Sep 26, 2016 at 9:32 PM, Charlie England <ceengland7@gmail.com>
wrote:
> On 9/26/2016 9:05 PM, Art Zemon wrote:
>
> Folks,
>
> I need to connect a shielded cable to my DB-25 connector and I need some
> advice about how to physically construct this....
>
> Art,
>
> I believe Bob has a 'cookbook' page showing that technique for handling
> shields at sub-d connectors. You should be fine.
>
I found it: Shield Termination Techniques
<http://www.aeroelectric.com/articles/pigtail/pigtail.html>
I can adapt that nicely. Thank you, Charlie.
-- Art Z.
--
https://CheerfulCurmudgeon.com/
*"If I am not for myself, who is for me? And if I am only for myself, what
am I? And if not now, when?" Hillel*
Message 4
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Subject: | Re: solder splices |
i agree that the joint if undisturbed can't be beat. i was questioning if
movement would become a factor in the condition i described.
bob noffs
On Mon, Sep 26, 2016 at 10:17 AM, Roger <rnjcurtis@charter.net> wrote:
>
>
> i know solder connections are generally frowned on, especially in engine
> compartment but my take on a solder splice in the middle of a 6'' run with
> the wire bundled with 6 others is that it is totally satisfactory. am i
> wrong that solder is ok if you pick your application sites?
>
>
> *I was never aware that solder connections were frowned upon! In fact my
> belief is that a well executed solder connection, with good mechanical
> connection, good solder flow, and a double insulation with heat shrink, is
> in fact more reliable than any other connection, over the long term. Just
> my humble opinion!*
>
>
> *Roger*
>
>
Message 5
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Subject: | Re: solder splices |
At 07:07 AM 9/26/2016, you wrote:
>hi all,
>=C2 i know solder connections are generally
>frowned on, especially in engine compartment but
>my take on a solder splice in the middle of a
>6'' run with the wire bundled with 6 others is
>that it is totally satisfactory. am i wrong that
>solder is ok if you pick your application sites?
>=C2 bob noffs
I don't know why it wouldn't be just fine ANYWHERE
the materials, talents and tools are likely to
produce a serviceable joining . . . irrespective
of location.
Soldering was 'frowned upon' on the 1960's
production lines at Cessna because soldering irons
burned people and melted carpets. At Boeing, I had
to have a fireman come out and give me a permit
to plug in an iron . . . just to make sure I wasn't
working the task close to flammables. It's process
sensitive (meaning you gotta have the moves).
But an artfully crafted solder joint is no
more/less risky to meeting design goals than
a crimped connection.
Bob . . .
Message 6
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Subject: | Re: solder splices |
ok, away we go. i like my soldered joints more than any crimped joint cuz i
made them.
bob
On Tue, Sep 27, 2016 at 7:36 AM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 07:07 AM 9/26/2016, you wrote:
>
> hi all,
> =C3=82 i know solder connections are generally frowned on, especially in
engine
> compartment but my take on a solder splice in the middle of a 6'' run wit
h
> the wire bundled with 6 others is that it is totally satisfactory. am i
> wrong that solder is ok if you pick your application sites?
> =C3=82 bob noffs
>
>
> I don't know why it wouldn't be just fine ANYWHERE
> the materials, talents and tools are likely to
> produce a serviceable joining . . . irrespective
> of location.
>
> Soldering was 'frowned upon' on the 1960's
> production lines at Cessna because soldering irons
> burned people and melted carpets. At Boeing, I had
> to have a fireman come out and give me a permit
> to plug in an iron . . . just to make sure I wasn't
> working the task close to flammables. It's process
> sensitive (meaning you gotta have the moves).
> But an artfully crafted solder joint is no
> more/less risky to meeting design goals than
> a crimped connection.
>
>
> Bob . . .
>
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