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MHerder
Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX
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 Posted: Sun Oct 17, 2010 5:45 pm Post subject: STROBE NOISE RESOLVED??? |
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So I've spent hours upon hours, maybe 15-20 hrs or so trying to find my strobe noise. Looking back I just had too many variables, and not enough constants. Please follow along and see if you can figure out what was or is going on.
Equipment: Garmin SL40 Radio, Flightcom Intercom, Pilot USA ANR Headset, Flight Data Systems Audio Mixer, all headphone and mic jacks insulated and grounds grounds at one point wires shielded and drained at one end only.
So here's how my story goes, please follow as there may be something to be learned here
Condition: Mild strobe noise, but annoying whining sound.
Attempts to solve:
1) Tried jumper to closest to positive lead of battery power supply. NO SUCCESS
2) Tried shielded wire to strobe. NO SUCCESS
3) Identified that proximity of wires to audio sources was a contributing factor. Verified by moving wires closer to and further away from each other. AHA! I thought. I Decided to reassemble entire harness and reroute all audio rather than reroute strobe. This decision was made since I wasn't real happy with my first attempt at the audio source anyway.
4) After rewiring harness, it was observed that I had no side tone... This was all of a sudden, since side tone was working prior and I know my SL40 produces side tone. I realized that I must have miswired something and I was correct. I screwed up and mixed barrel, tip and ring. ALL OF A SUDDEN EVERYTHING WORKED GREAT AND I WAS ON CLOUD 9. NO STROBE NOISE, SIDETONE WAS WORKING, TRANSMIT AND RECEIVE CLEAR AS DAY. WHAT A FANTASTIC DAY IT WAS... JUST ONE MORE THING TO DO.... HOOK UP MY AUDO INPUT FOR AN IPOD.
5) Hooked up audio input. STOBE NOISE AGAIN???? The input must be the input creating an issue I thought. Disconnect audio input. STILL STROBE NOISE!!!! What the hell is going on? How could this be?
6) Well maybe I didn’t reroute everything far enough away? So I moved the strobe power supply. STILL STROBE NOISE. WHAT THE HECK IS GOING ON. NOW I’M 15 HRS INTO THIS MESS AND GETTING REALLY TIRED OF PLAYING WITH IT.
7) Success… I think… No strobe noise.
So what happened between step 6 and 7? I think the same thing that happened between step 4 and 5. A change in the volume settings in the headset. When I hooked up my Ipod, I wasn’t getting sound loud so I messed with the left and right independent volume control, I could have just turned up the volume in the Ipod, but I didn’t . I turned up the volume in each input of the headset. For some reason I played with the volume again tonight. I found that can make the noise go away by keeping each of the headset volumes below 60% for left and right channels in the headset. I can still hear and adjust radio volume and intercom volume, and all is well. I’m very happy, if this is the final solution to the problem. The only thing I haven’t done is tried with a regular non ANR headset with mono input. The reason that bring this up is that I now believe that I have some acceptable level of noise that will probably never go away, and is probably very very minute in comparison to issues that others are having, but my hypothesis is that the noise is so minute that if not amplified by my headset, would never have been detected.
Any thoughts on the matter are welcome and encouraged. I’m glad to share the story just so others know of another cause of their “perceived problem” . Thanks for sticking with me and enduring this long story.
MY TECHNICAL ADVISOR TOLD ME TO PUT THE DAMN THING BACK TOGETHER AND GO FLY! I think he's right.
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MHerder
Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX
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| Posted: Sun Oct 17, 2010 6:14 pm Post subject: Re: STROBE NOISE RESOLVED??? |
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One thing further to add Bob. Thank you so much for your help in solving this dilemma.
Let me clarify, that I'm not trying to find the holy grail of a totally noise free airplane, but what I thought was an issue might not be one all together. I just wanted to know and understand what was going on. I think that type of tenacity is what has lead me to the very near completion of the airplane (wheras most homebuilts don't get finished up), but this tenacity has also been a stop block to progress in certain instances.
Your post regarding your issue on the king air line and the usefulnesss of Signal to noise ratio as a benchmark was not read by me until after I posted a moment ago, but I think you hit the nail on the head. While taxiing around yesterday... Probably while you were posting I notice that even with the headhpones past 60% volume turned up, I couldnt hear the noise with my Jabiru turning past 1300 rpm anyway. Now with the volume at 50% or below I cant hear it at all. Is my headphne actually amplifying the minimal noise? I think so.
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Jabiru 3300
Wood Sensinich 64x47
Finally Flying |
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nuckolls.bob(at)aeroelect
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| Posted: Mon Oct 18, 2010 8:39 am Post subject: STROBE NOISE RESOLVED??? |
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At 09:14 PM 10/17/2010, you wrote:
<michaelherder(at)beckgroup.com>
One thing further to add Bob. Thank you so much for your help in
solving this dilemma.
Let me clarify, that I'm not trying to find the holy grail of a
totally noise free airplane, but what I thought was an issue might
not be one all together. I just wanted to know and understand what
was going on.
Good for you!
I think that type of tenacity is what has lead me to the very near
completion of the airplane (wheras most homebuilts don't get
finished up), but this tenacity has also been a stop block to
progress in certain instances.
Your post regarding your issue on the king air line and the
usefulnesss of Signal to noise ratio as a benchmark was not read by
me until after I posted a moment ago, but I think you hit the nail on
the head. While taxiing around yesterday... Probably while you were
posting I notice that even with the headhpones past 60% volume turned
up, I couldnt hear the noise with my Jabiru turning past 1300 rpm
anyway. Now with the volume at 50% or below I cant hear it at
all. Is my headphne actually amplifying the minimal noise? I think so.
I've oft suggested that education is not cheap.
The most valuable lessons are hard won in terms
of time, deliberation and scrapped parts. There's
another reader working on a wig-wag configuration
that sparked his interest. It may turn out to
be a useful exercise for his project, it may never
fly. What he learns from this exercise will prove
more valuable than the finished device. I can tell
you that I've thrown far more parts in the trash
than ever ended up in the first successful prototype.
Bottom line is that what you take away from this
experience will be valuable in two ways. It
adds to your bundle of knowledge and makes future
endeavors less expensive for not having to learn
something new. It also qualifies you to be a teacher
of simple-ideas as demonstrated by first-hand
experiences in your shop. Sharing with the rest
of the List members benefits us all.
Bob . . .
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