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Old 05-21-2023, 11:48 AM
Ross7A-builder Ross7A-builder is offline
Join Date: Jan 2020
Location: Richmond, VA
Posts: 22
Default Need to separate the strobe wires?

I'm running the wires and I'll have wingtip and taillight LED strobes. If I use STEINAIR shielded wire and make all connections per directions, do I need to separate the strobe wires or can they share the same snap bushing penetrations and wire bundles? I'll probably be running the radio wires separately to the aircraft underside so I'm just thinking about interference with autopilot, AHRS, etc.
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Old 05-21-2023, 12:27 PM
BobTurner BobTurner is offline
Join Date: Dec 2011
Location: Livermore, CA
Posts: 8,898

More info needed….
If you are using FlyLed products, they use dropping resistors and are electrically quiet - no shielding is needed.
If you use a product with a PWM (pulse width modulation) device to limit current, they can generate noise. Is the PWM device at each light, or centrally located (and propagating noise thru the wires)?
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Old 05-21-2023, 05:24 PM
sahrens's Avatar
sahrens sahrens is offline
Join Date: Jan 2007
Location: Battle Ground WA
Posts: 669
Default separated

I ran my strobe shielded wires separately from the autopilot wires and maintained 2 1/2' from the ADAHRS.

My ADAHRS are located aft of the baggage compartment up by the turtle deck and the strobe power pack is located aft of the baggage compartment and on the right side.

I have had no issues with noise over the avionics or intercom.
RV-7 N818BG (flying)
Bearhawk Patrol (building)
RV-7 (resurrecting)
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Old 05-21-2023, 10:43 PM
Paul from Flyleds's Avatar
Paul from Flyleds Paul from Flyleds is offline
Join Date: Apr 2016
Location: Melbourne, Australia
Posts: 288

Hi Ross

The idea of using shielded cable is to keep all the noise either inside or outside the shield; it works both ways. Your (potentially) electrically noisy device wiring won't radiate noise into other wiring, and likewise your sensitive low level wiring like headphones won't pick up noise from other wires.
So in general it shouldn't be a problem to run these wires together. Your Flyleds lights definitely won't cause any issues!

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Your statement "...and make all connections per directions" is a key point. The directions may be different for each system.

Paul McVitty
VAF advertiser
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Old 05-22-2023, 06:10 AM
Ross7A-builder Ross7A-builder is offline
Join Date: Jan 2020
Location: Richmond, VA
Posts: 22

Thx to all for getting right back. I have a nice set of FLYLEDs (strobes, NAV, four leading edge lights in each wing) and re-read the instructions just last week. Just checking to be thorough.
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