REFLECTOR: Position Light Wires

Kurt Winker nmflyer1 at aol.com
Thu Jun 27 14:19:44 CDT 2013


Sounds good.  Thanks much!
KW

Sent from my iPhone

On Jun 27, 2013, at 13:11, Brian Michalk <michalk at awpi.com> wrote:

> Only shield wires that:
> 1)    radiate a lot of noise (capacitively  -- i.e., have a large dv/dt)
> 2)    are sensitive to noise
> 
> Position lights are very quiet, and you don't care if they collect noise from other sources.
> 
> Strobes are noisy, so twisting and shielding the power/ground leads works there.  If your strobe power pack charge pump is RF noisy (bad capacitors) then, yes, shielding is needed, but IMO, that's treating the symptom.
> 
> On my airplane, it's very quiet electrically.  The big offenders: electronic injectors, coil packs, alternator are all twisted power/ground pairs.
> 
> I do not shield ANY of my avionics (not even microphones).  They are quite happy with the arrangement.  Proper grounding is the key to a noise free airplane.
> 
> On 6/27/2013 1:59 PM, nmflyer1 at aol.com wrote:
>> All, 
>> 
>> Quick question on Position Light wires.
>> I am getting ready to put the wings back on after WAY too much time painting & buffing. 
>> Looked in the manual and Knuckols book, and can not find the answer to this. 
>> Is there need to use shielded wires for the Position lights Only, within the wing? 
>> 
>> I could run standard wires, 
>> I could run separate shielded power/ground wires
>> I could run a 16G shielded wire using the center as Power and the Shield as Ground. 
>> (the power feed down the duct IS a shielded wire.)
>> 
>> All will transfer the power of course, just curious about possible whine in the radios due to the power line running near the antenna wire. 
>> 
>> Input please.... Need to get these big mutha wings on while I have a luxury day off :) 
>> 
>> Thanks, 
>> 
>> Kurt 
>> 
>> 
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