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nuckolls.bob(at)aeroelect
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 Posted: Thu Jul 17, 2014 5:15 am Post subject: P Lead Wires Adjacent to Headset Jack Wires |
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At 11:43 PM 7/16/2014, you wrote:
| Quote: |
In the interests of killing two birds with one stone, could I run my
headset and mic jack wires in the same 3/8" dia aluminum conduit as
my mags' P lead wires without screwing up my audio
signals? Inasmuch as the P lead wires need to be shielded I'm
thinking this is probably a really bad idea and would probably
cripple my audio but as it would make such a slick installation in
my case I thought I'd ask.
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Not a problem as long as you pay due
homage to the physics gods . . . the
shields for the p-leads should not
come to ground at any location but the
engine-end. Shields for the audio system
terminate at the 'radio end'.
But I'm curious, how is it that locations
of the various and sundry components made
this conduit an attractive option for
holding this combination of wires?
Bob . . .
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stearman456
Joined: 14 Aug 2010
Posts: 49
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| Posted: Thu Jul 17, 2014 6:35 am Post subject: P Lead Wires Adjacent to Headset Jack Wires |
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Thanks Bob, I really appreciate the advice and help.
I'm restoring a Stearman. The headset & mic jacks and intercom PTT for
the front seat all reside on the front instrument panel. The radio and
txdr are in a box in the rear cockpit mounted to the back of the front
seat ahead of the stick. The mag switch is on the rear instrument panel
on the extreme left and the airplane's main DC wiring harness runs down
the right hand side of the fuselage from the rear cockpit to the
firewall J box. I wanted to keep as much room as possible between the
main harness and the audio harnesses so the front seat harness is going
to run down the left hand side of the front cockpit and then downwards
once abeam the rear instrument panel to the radio box. To protect the
audio harness I want to run it in a small aluminum conduit and as that
will parallel the P leads anyway I thought wouldn't it be slick if the P
leads could be in there as well? A zinc chromate painted conduit of
that size will be nicely camouflaged amongst all the link rods over
there anyway and won't look as out of place as a bundle of small, 21st
Century wiring would.
And all the fat wires and fuses are up on the firewall inside the
junction box and well away from the avionics in the back. The only CB's
in the system are for the VHF, txdr, and the Alt field. The design goal
for the airplane from the beginning was airline quality VHF radio -
something that in an old open cockpit biplane is abit of a rarity!
Thanks for the help!
Dan Jones
On 7/17/2014 7:13 AM, Robert L. Nuckolls, III wrote:
| Quote: |
<nuckolls.bob(at)aeroelectric.com>
At 11:43 PM 7/16/2014, you wrote:
>
> <warbirds(at)shaw.ca>
>
> In the interests of killing two birds with one stone, could I run my
> headset and mic jack wires in the same 3/8" dia aluminum conduit as
> my mags' P lead wires without screwing up my audio signals? Inasmuch
> as the P lead wires need to be shielded I'm thinking this is probably
> a really bad idea and would probably cripple my audio but as it would
> make such a slick installation in my case I thought I'd ask.
Not a problem as long as you pay due
homage to the physics gods . . . the
shields for the p-leads should not
come to ground at any location but the
engine-end. Shields for the audio system
terminate at the 'radio end'.
But I'm curious, how is it that locations
of the various and sundry components made
this conduit an attractive option for
holding this combination of wires?
Bob . . .
|
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stearman456
Joined: 14 Aug 2010
Posts: 49
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| Posted: Thu Jul 17, 2014 6:37 am Post subject: Re: P Lead Wires Adjacent to Headset Jack Wires |
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delete
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Last edited by stearman456 on Thu Jul 17, 2014 6:49 am; edited 1 time in total |
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