Today's Message Index:
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1. 06:15 AM - Re: P Lead Wires Adjacent to Headset Jack Wires (Robert L. Nuckolls, III)
2. 07:35 AM - Re: P Lead Wires Adjacent to Headset Jack Wires (Dan Jones)
3. 07:38 AM - Re: P Lead Wires Adjacent to Headset Jack Wires (stearman456)
4. 09:30 AM - Re: Re: P Lead Wires Adjacent to Headset Jack Wires (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: P Lead Wires Adjacent to Headset Jack Wires |
At 11:43 PM 7/16/2014, you wrote:
>
>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 . . .
Message 2
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| Subject: | Re: P Lead Wires Adjacent to Headset Jack Wires |
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:
> <nuckolls.bob@aeroelectric.com>
>
> At 11:43 PM 7/16/2014, you wrote:
>> <warbirds@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 . . .
>
>
Message 3
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| Subject: | Re: P Lead Wires Adjacent to Headset Jack Wires |
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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=426837#426837
Message 4
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| Subject: | Re: P Lead Wires Adjacent to Headset Jack Wires |
>
>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!
Nothing in your narrative suggests any
potential for 'gotchas' . . . but in
any case, your risks are low . . . the
worst case says you'll discover some
effect we've not considered. Let us
know the outcome!
Bob . . .
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