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Question: can these wires be put in one wire bundle?

 
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nuckolls.bob(at)aeroelect
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PostPosted: Sun Oct 07, 2018 9:42 am    Post subject: Question: can these wires be put in one wire bundle? Reply with quote

Quote:
My plan was to put all the wires for both units into a single wire bundle except for the mic, phone and ptt wires. In addition I plan of putting a single power and ground wire into this bundle, connecting to a separate fuseblock near the units in the back (of course, the AWG of these will be scaled upwards appropriately).

There are no noise problems associated
with bundling mixed signals. It's done
in the big birds all the time . . . even
the shielded wires. The whole reason for
shielding is to break the electro-static
coupling path between potential antagonist/
victim pairs.

Suggest you not put part of your bus structure
in the rear. Keep it simple, one fuse for each
protected feeder from the central bus structure
to each powered device. A combined ground for
all rear mounted devices works. We show this
'star' configuration grounding system in Figure
Z-15 with an extension to the instrument panel . . .
a second extension to rear mounted appliances
works too.


Quote:
I will also need to put two shielded audio cables back to front to connect into the AP60 audio mixer that is also in the back near the radio/xpdr units. I guess it's best to keep those separate from this bundle, but as these audio wries will be running sort of parallel to mentioned wire bundle what is the minimum distance between these two runs to avoid audio issues? Also: if my guess of keeping the audio wires separate is wrong, please let me know.


I would bundle all power and ground wires from panel
rearward together including the audio. Further, there
is no reason to route coax separately . . . the
signal isolation physics for shielding applies
to radio frequencies as it does for low level
audio.

Spent 40 years herding electrons in everything
from C150 to B400 and Learjets. There is vigorous
competition between the various system groups for
space, weight and volume on the airplane. Finding
placed to put things and wire it all up can be
challenging. Worries about mixed signals in
wire bundles is wwaaaayyy down on the list
of concerns. Proper design and qualification
of the appliances makes 'em installer/user
friendly. It's called electromagnetic compatibility
or EMC for short.


Bob . . .


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zwakie



Joined: 03 Aug 2009
Posts: 136

PostPosted: Sun Oct 07, 2018 1:21 pm    Post subject: Re: Question: can these wires be put in one wire bundle? Reply with quote

nuckolls.bob(at)aeroelect wrote:

There are no noise problems associated
with bundling mixed signals. It's done
in the big birds all the time . . . even
the shielded wires. The whole reason for
shielding is to break the electro-static
coupling path between potential antagonist/
victim pairs.

That is how I understood it from the 'Conneciton, thanks for confirming.
nuckolls.bob(at)aeroelect wrote:

Suggest you not put part of your bus structure
in the rear. Keep it simple, one fuse for each
protected feeder from the central bus structure
to each powered device. A combined ground for
all rear mounted devices works. We show this
'star' configuration grounding system in Figure
Z-15 with an extension to the instrument panel . . .
a second extension to rear mounted appliances
works too.

I know star conifgurations are not ideal, but this is going to be an intermediate solution until I have my new panel ready for installation. I thought for a limiited time I should get away with it. Am I assuming wrong?
nuckolls.bob(at)aeroelect wrote:

I would bundle all power and ground wires from panel
rearward together including the audio.

Will do, thanks.
nuckolls.bob(at)aeroelect wrote:

Further, there
is no reason to route coax separately . . . the
signal isolation physics for shielding applies
to radio frequencies as it does for low level
audio.

Point taken. In my case all coax runs more aft, so no issue there...

Thanks Bob for taking the time to answer my questions in detail, really appreciated!

Marcel


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Marcel Zwakenberg
XS TG || 912ULS || PH-SBR
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