---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 09/30/16: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:01 AM - Re: Strobe Grounding (Art Zemon) 2. 07:44 AM - Re: Strobe Grounding (William DeLacey) 3. 09:40 AM - Re: Strobe Grounding (Eric Page) 4. 11:14 AM - Re: Strobe Grounding (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 05:01:26 AM PST US From: Art Zemon Subject: Re: AeroElectric-List: Strobe Grounding Mike, The instructions for the AeroLEDS Pulsar show the shield connected to local ground at both ends. -- Art Z. On Thu, Sep 29, 2016 at 10:48 PM, wrote: > > > I have installed a Whelen HDACF Power Supply in my composite aircraft and > the instructions make no mention of grounding the shield in the cables to > the strobes. > > Should I ground the shield and if yes should it be one or both ends. > > Thanks > > Mike -- https://CheerfulCurmudgeon.com/ *"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel* ________________________________ Message 2 _____________________________________ Time: 07:44:09 AM PST US From: William DeLacey Subject: Re: AeroElectric-List: Strobe Grounding This should be the subject of a discussion hopefully with input from Aerole ds. I installed Aeroleds Pulsars. I had major loud static noise during the fi rst flights. In phone discussions with Aeroleds, I was instructed to disconnect the outb oard shield grounds and insulate that end shield from any structure near th e Aeroleds light. This greatly reduced my static noise. I still have a low level Aeroleds strobe sound ( But not at a level objecti onable to me), but, I still have a significant static noise ( primarily on the ground during taxiing) but still occasionally in the air. This winter I intend to try and trace all the Aeroleds wiring and find an intermittent ground location or connection The Aeroleds schematic shows grounding the shield at both ends ( in my inte rpretation). I can only offer, be very careful in the Aeroleds wiring and grounding. You will not enjoy Aeroleds static noise! I would suggest Aeroleds should provide some additional guidance for their product as the installation schematic is not clear. I do like the Aeroleds products and hope this gets some clarification. On Sep 30, 2016, at 4:54 AM, Art Zemon > wrote: Mike, The instructions for the AeroLEDS Pulsar show the shield connected to local ground at both ends. -- Art Z. On Thu, Sep 29, 2016 at 10:48 PM, > wrote: ion499.com> I have installed a Whelen HDACF Power Supply in my composite aircraft and t he instructions make no mention of grounding the shield in the cables to th e strobes. Should I ground the shield and if yes should it be one or both ends. Thanks Mike -- https://CheerfulCurmudgeon.com/ "If I am not for myself, who is for me? And if I am only for myself, what a m I? And if not now, when?" Hillel ________________________________ Message 3 _____________________________________ Time: 09:40:19 AM PST US From: Eric Page Subject: Re: AeroElectric-List: Strobe Grounding Mike, See "Interconnecting Cable" and Fig 3, on page 2 of this document: http://www.whelen.com/install/136/13603.pdf Eric > On Sep 29, 2016, at 8:48 PM, mike@vision499.com wrote: > I have installed a Whelen HDACF Power Supply in my composite aircraft and the instructions make no mention of grounding the shield in the cables to the strobes. > > Should I ground the shield and if yes should it be one or both ends. > > Thanks > > Mike ________________________________ Message 4 _____________________________________ Time: 11:14:26 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Strobe Grounding > >I installed Aeroleds Pulsars. I had major loud static noise >during the first flights. The word 'static' conjures up a mental picture of radio noise on an AM radio tuned off-station with thunder storms in the area. Or perhaps the noise heard near a high voltage transmission line where one or more insulators are failing. "Static" normally describes random, short duration impulses . . . no regularity reminiscent of a tone or musical note. Can you be a bit more descriptive? Also, did you conduct any investigative operations to determine whether the noise was coming in through antenna, power supply or system signal leads (See chapter 16 in the 'Connection'. >In phone discussions with Aeroleds, I was instructed to disconnect >the outboard shield grounds and insulate that end shield from any >structure near the Aeroleds light. This greatly reduced my static noise. This is a disturbing revelation. The AEROLED website speaks to STC and TSO qualification of products. These assertions argue with any narrative suggesting that treatment of shields had a profound effect on an objectionable emission of noise. >I still have a low level Aeroleds strobe sound ( But not at a level >objectionable to me), but, I still have a significant static noise ( >primarily on the ground during taxiing) but still occasionally in >the air. This winter I intend to try and trace all the Aeroleds >wiring and find an intermittent ground location or connection Please go through the diagnostic exercises described in the 'Connection. Also, it would be VERY helpful if you could post a .wav or .mp3 recording of the sounds you hear. The qualification processes for dozens of products and systems I've shepherded through DO-160/MIL-STD-461 qualification would not have allowed a program to move forward with EMC deficiencies that you've described. >The Aeroleds schematic shows grounding the shield at both ends ( in >my interpretation). I can only offer, be very careful in the >Aeroleds wiring and grounding. You will not enjoy Aeroleds static noise! > >I would suggest Aeroleds should provide some additional guidance for >their product as the installation schematic is not clear. > >I do like the Aeroleds products and hope this gets some clarification. Precisely. Shielding of wires is intended to break ELECTROSTATIC coupling between a potentially antagonistic signal (high voltage, fast rise) and a potential victim wire carrying low level data. The de-coupling process is guaranteed only to ward off exchange of unfriendly energy between conductors in adjacent wire bundles. Any time the existence or treatment of shields has an effect on RADIATED noise (stuff that comes in through the antennas), there is a SERIOUS problem with that product's design and qualification. I think it unlikely that you have any small-signal data or audio lines bundled with shielded wires in the strobe system; hence this thread suggests value in a more detailed investigation. Bob . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.