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Strobe Noise Low Voltage?

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MHerder

Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX

Posted: Fri Oct 15, 2010 5:26 am Post subject: Strobe Noise Low Voltage?

Can and how if so, low voltage cause strobe noise in your headset?

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nuckolls.bob(at)aeroelect
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Posted: Fri Oct 15, 2010 6:53 am Post subject: Strobe Noise Low Voltage?

At 08:26 AM 10/15/2010, you wrote:

 	  Quote: 	
		  

<michaelherder(at)beckgroup.com>



Can and how if so, low voltage cause strobe noise in your headset?


	


   Can you explain the background for this question?

   Generally speaking, low voltage is not a proximate

   cause for changes in noise levels. Under what conditions

   of "low voltage" do you perceive a noise that is

   not perceptible under conditions of "higher voltage?"



   Bob . . .

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MHerder

Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX

Posted: Fri Oct 15, 2010 7:14 am Post subject: Re: Strobe Noise Low Voltage?

Background:



Headset noise observed with strobe on, Garmin SL40 and Flightcom 403 intercom, Aeroflash Srobe (By Noise I mean Whine).  Contributing factor was certainly strobe wires too close to radio….  I verified this by moving the strobes entirely away from the radio wires… Noise went away…  Closer together… Noise. I then decided, I wasn’t happy with my first attempt at making a harness anyway, so instead of rerouting the strobe wires, I would reroute the audio wires….   I did that , and the noise went away entirely.  To the point that with my eyes closed I couldn’t tell whether or not the strobes were on, with my headset on….  THEN I came out the next day, no noise but as the voltage level decreased…  Say to 10V,  (nearly dead battery) the strobe noise reappeared, and appear to increase with decrease in voltage.   



So now I have what I would describe as an intermittent problem, that appears to be varying with my voltage levels.  The first thing I will do is obviously charge the battery to where it should be, but even if it goes away with a charged battery, I’d like too know why such a  thing would be occurring.

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edleg

Joined: 11 Jun 2009
Posts: 14

Posted: Fri Oct 15, 2010 11:01 am Post subject: Re: Strobe Noise Low Voltage?

Normally at 10vdc you don't have an intermittant noise problem.... you have a failed electrical system. I believe the "normal" low voltage cutoff for a 12v battery should be 10.5v and anything lower is leading to disaster (literally and figuratively). 



Why would you test your electrical system at 10vdc when that is not a normal operating parameter... and who cares if there is noise at 10vdc?

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MHerder

Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX

Posted: Fri Oct 15, 2010 11:07 am Post subject: Re: Strobe Noise Low Voltage?

I'm not intentionally testing it that low, it's just that I'm not flying and I'm only running the engine every couple of weeks.  I've spent hours upon hours trying to find my strobe noise issue.  In the mean time, I'm realizing that I haven't charged the battery and all the while my strobes are draining battery.  



Last night it just occured to me that my problem might just be related to that.  And, I dont care if there is strobe noise at 10V as long as that is the issue and not a poor ground or something similar.

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Posted: Fri Oct 15, 2010 5:44 pm Post subject: Strobe Noise Low Voltage?

Mike - 



If I remember your quandary correctly, it makes perfect sense.  I think you

reported that you had a noise issue, and separating the strobe and audio

lines made it better.  As you deplete the battery, the problem returns and

gets worse as the voltage declines.  



Your strobes want (demand) a nominal amount of POWER (E*I) to operate.  As

voltage sags, current must rise to meet the power requirement of the

appliance.  Current flowing in a conductor generates an electromagnetic

field.  The higher the current, the larger the EM field (there's a quadratic

or integral relationship there, but it's too rusty to remember).  



neal



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nuckolls.bob(at)aeroelect
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Posted: Sat Oct 16, 2010 6:31 am Post subject: Strobe Noise Low Voltage?

At 02:07 PM 10/15/2010, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "MHerder" <michaelherder(at)beckgroup.com>



 I'm not intentionally testing it that low, it's just that I'm not flying and I'm only running the engine every couple of weeks.  I've spent hours upon hours trying to find my strobe noise issue.  In the mean time, I'm realizing that I haven't charged the battery and all the while my strobes are draining battery.  



 Last night it just occured to me that my problem might just be related to that.  And, I dont care if there is strobe noise at 10V as long as that is the issue and not a poor ground or something similar. 	


    This thread brings up several thoughts from

    the depths of past experiences . . .



    The noise levels you may be hearing while parked

    in the hangar just may be too small to be significant

    with the engine running . . . or with the aircraft

    in flight.



    I recall being summoned to the King Air line many

    moons ago to help with some blower motor noise that

    was reported audible in the cockpit intercom system.

    When I got there, I discovered that the volume controls

    were all maxed out and yes, you could hear some motor

    noise that went away when the blower breaker was

    pulled. After repositioning the controls to levels

    typical of normal flight conditions, I asked if

    they thought the noise might be objectionable or

    even perceptible over normal cockpit noises.



    They checked a few more airplanes and then talked

    to some pilots and decided that it was a non-problem.

    This scenario has repeated many times. No system is

    totally free of extraneous noises. The benchmark

    for usefulness is quantified by Signal to Noise Ratio.

    Make sure your observations are not being made under

    extraordinary measurement conditions.



    It's also possible that a power supply becomes extra-

    noisy under low voltage conditions. Suggest you

    invest in a nice 13.8v, switchmode power supply

    to power up systems on the ground. There's a boat

    load of nice supplies on Ebay right now.



  http://tinyurl.com/2fgxrrz 



 

   Bob . . .    [quote][b]

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Sun Oct 17, 2010 5:20 pm Post subject: Strobe Noise Low Voltage?

First point... is only the front end (supply) voltage of a strobe is low

voltage.  The leads ot the tubes and the tubes themselves are definitely

high voltage.  Tos keep clicking out of your headphones start with a well

grounded strobe installation with shielded wires going from the strobe unit

to the tubes.  Then you may want to have a look at the Audio installation in

your plane.  My experience has been most problems in avionics stem somewhere

from poor grounding.



Checking grounding can be time consuming as you will first want to locate

all the grounds.  Dont forget the ground on the case of some regulators.

Once you know where all the ground connections are you can start making sure

they are all shiny clean.



On other lists there has been a lot of discussion about grounding shields;

one end or two.  All the installation manuals I've ever seen say ground

shield wires at the source end only.  There is and exception to this and

that is when coax is used.  

Then you will want to make sure the grounds on both ends are clean.



Noel



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