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Poor Wiring Practice for VHF Noise?

 
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stearman456



Joined: 14 Aug 2010
Posts: 49

PostPosted: Fri Mar 16, 2012 5:45 am    Post subject: Poor Wiring Practice for VHF Noise? Reply with quote

Hi Bob,

Would it be poor practice from an RFI point of view to run the avionics bus + wire and the strobe light power supply (Whelan A13A, HDA CF-14/28 ) + wire in the same bundle? Or the VHF + wire (remotely located Garmin SL40) and strobe light power supply + wire in another bundle? My switch panel is almost finished and will have these two bundles coming in and then going out of it. The "fat" wires are all up front on the firewall about 4 ft away.

Dan


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nuckolls.bob(at)aeroelect
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PostPosted: Fri Mar 16, 2012 10:19 am    Post subject: Poor Wiring Practice for VHF Noise? Reply with quote

At 08:45 AM 3/16/2012, you wrote:
Quote:


Hi Bob,

Would it be poor practice from an RFI point of view to run the
avionics bus + wire and the strobe light power supply (Whelan A13A,
HDA CF-14/28 ) + wire in the same bundle? Or the VHF + wire
(remotely located Garmin SL40) and strobe light power supply + wire
in another bundle? My switch panel is almost finished and will have
these two bundles coming in and then going out of it. The "fat"
wires are all up front on the firewall about 4 ft away.

In the heavy iron bird business, products bolted
to airplanes are expected to be friendly citizens
of the avionics community. In fact, there is a
price of admission for gaining a seat aboard a type
certificated aircraft. See:

http://www.aeroelectric.com/articles/Philosophy/Whats_all_this_DO160_Stuff_Anyhow.pdf

When every systems guy has to fight for and then
jealously guard space on the airplane allotted to
his efforts, it would be a disaster of some discovery
were made where separation of certain wires from certain
other wires was necessary or useful.

Short answer is that wire bundles properly installed
do not need to be separated for the purpose of
protecting the performance of the home system
or its neighbors.

Bob . . .

---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------


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stearman456



Joined: 14 Aug 2010
Posts: 49

PostPosted: Sat Mar 17, 2012 6:17 am    Post subject: Re: Poor Wiring Practice for VHF Noise? Reply with quote

nuckolls.bob(at)aeroelect wrote:

When every systems guy has to fight for and then
jealously guard space on the airplane allotted to
his efforts, it would be a disaster of some discovery
were made where separation of certain wires from certain
other wires was necessary or useful.


Of course! I never stopped to look at it from that angle. That makes perfect sense. Thanks very much for the help.

Dan


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