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Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
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 Posted: Mon Jan 17, 2011 12:00 pm Post subject: shielding through DB9s |
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I am keen to provide a shield through one end of a 4-wire cable to the other (it’s grounded only at one end and that will be preserved). The cable must be cut to accommodate feed-through needs, so am using DB9s.*
Thing is, if I use metal-sprayed bodies, can I feed the wires through the shield (as for a single wire) and then solder the shield to a wire which is wound ‘round one of the assembly bolts (#4x40)? This I hoped would continue the shield through both DB9 bodies (bolt-body-body-bolt) and onto the next section of shielded cable.
What say you?
Fair winds,
Ferg
Europa Classic mono 914
*The cable joins the Dynon D-100 EFIS to its attitude sensor eight feet away and might be sensitive to nearby RF
[quote][b]
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Bob McC
Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON
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| Posted: Mon Jan 17, 2011 1:25 pm Post subject: shielding through DB9s |
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Ferg;
Simply carry the ground through one of the pins in the DB9. Don't worry about the cover. The unshielded portion within the cover is so tiny as to be insignificant.
Bob McC
From: VE3LVO(at)rac.ca
To: aeroelectric-list(at)matronics.com
Subject: AeroElectric-List: shielding through DB9s
Date: Mon, 17 Jan 2011 14:56:36 -0500
I am keen to provide a shield through one end of a 4-wire cable to the other (it’s grounded only at one end and that will be preserved). The cable must be cut to accommodate feed-through needs, so am using DB9s.*
Thing is, if I use metal-sprayed bodies, can I feed the wires through the shield (as for a single wire) and then solder the shield to a wire which is wound ‘round one of the assembly bolts (#4x40)? This I hoped would continue the shield through both DB9 bodies (bolt-body-body-bolt) and onto the next section of shielded cable.
What say you?
Fair winds,
Ferg
Europa Classic mono 914
*The cable joins the Dynon D-100 EFIS to its attitude sensor eight feet away and might be sensitive to nearby RF [quote]
-List" target=_blank>http://www.matronics.com/Navigator?AeroElectric-List
ttp://forums.matronics.com
=_blank>http://www.matronics.com/contribution
[b]
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_________________
Bob McC
Falco #908
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peter(at)sportingaero.com
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| Posted: Mon Jan 17, 2011 1:58 pm Post subject: shielding through DB9s |
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And use a solder sleeve to attach a pig-tail to the shield, and then the pig tail to the pin. Steinair SS-3, under heatshrink.
Peter
On 17/01/2011 21:20, Bob McCallum wrote: [quote] Ferg;
Simply carry the ground through one of the pins in the DB9. Don't worry about the cover. The unshielded portion within the cover is so tiny as to be insignificant.
Bob McC
From: VE3LVO(at)rac.ca (VE3LVO(at)rac.ca)
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: shielding through DB9s
Date: Mon, 17 Jan 2011 14:56:36 -0500
I am keen to provide a shield through one end of a 4-wire cable to the other (it’s grounded only at one end and that will be preserved). The cable must be cut to accommodate feed-through needs, so am using DB9s.*
Thing is, if I use metal-sprayed bodies, can I feed the wires through the shield (as for a single wire) and then solder the shield to a wire which is wound ‘round one of the assembly bolts (#4x40)? This I hoped would continue the shield through both DB9 bodies (bolt-body-body-bolt) and onto the next section of shielded cable.
What say you?
Fair winds,
Ferg
Europa Classic mono 914
*The cable joins the Dynon D-100 EFIS to its attitude sensor eight feet away and might be sensitive to nearby RF [b]
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nuckolls.bob(at)aeroelect
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| Posted: Mon Jan 17, 2011 3:20 pm Post subject: shielding through DB9s |
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At 03:20 PM 1/17/2011, you wrote:
| Quote: | Ferg;
Simply carry the ground through one of the pins in the DB9. Don't
worry about the cover. The unshielded portion within the cover is so
tiny as to be insignificant.
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Right on. I might add that there's no great transgression
for 'exposing' what might seem to be significant lengths
of the 'protected' wiring.
Shielding breaks electro-static coupling of noise that is
potentially significant if the victim wire shares a wire
bundle with a anatagnonist wire for considerable distance.
In a Beechjet were a pressure transducer wire might be
40' long and share a wire bundle with lots of butt-(at)#$(at)
noises, then the shielding has a high probability of
standing off a noise problem.
In our itty-bitty airplanes, wire runs are so short
that the probability of introducing noise issues for
lack of shielding is very low. I'll bet that 99.9% of
all shielded wires in small aircraft could be replaced
with unshielded, twisted pairs with no observable
adverse effects.
So make your shield transition at the connector look
nice even if it exposes what appears to be a lot of
wire.
See:
http://www.aeroelectric.com/articles/pigtail/pigtail.html
Solder sleeves are cool . . . and I do use them on
occasion but 'shade tree' shield terminations are
just as functional.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
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Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
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| Posted: Mon Jan 17, 2011 6:02 pm Post subject: Shielding through DB9s |
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Wow! What swift returns!
Many thanks for the suggestions on the above topic.
To Bob N: Sorry I missed the discussion on “articles/pigtail” and it of course answered my question superbly. It also saves me a lot of fiddly-fooly wirework. I am appreciative once more for the good offices on Matt Dralle’s net and Bob’s Connections. Thanks too to Bob Mcc. way down the QEW, 50 cliks from here.....!
Cheers
Ferg [quote][b]
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