Today's Message Index:
----------------------
1. 03:49 AM - Re: Garmin 400 series memory battery low (Gilles Thesee)
2. 08:36 AM - Re: strobe noise (Bernie)
3. 10:07 AM - Re: strobe noise (user9253)
4. 01:22 PM - Re: strobe noise (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Garmin 400 series memory battery low |
Le 12/10/2020 03:20, Charles Kuss a crit:
>
> /I would suggest you use Google Translate to translate the German
> instructions into English./
Charles and David,
Thank you for responding !
We'll now undertake the battery change with confidence - and some ESD
precautions...
Thanks,
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
Message 2
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| Subject: | Re: strobe noise |
Thanks to all of you for the quick responses. I=99ll be back to the ai
rplane in a couple days.
It is a 1956 G Bonanza. Plane power alternator. The strobes and wig wag nois
e is an alternating ping/hum. The pitot heat and landing lights are a steady
hum. The LED beacon is quiet. I did found
an empty grounding lug on the regulator. All of the above elec. devices are g
rounded to a ground buss which is stainless bolted to a bulkhead. Older radi
os are grounded to various unknown places. The noise goes away when I shut d
own the engine but haven=99t tried Turing off the alternator with the e
ngine running. Hope to get to it tomorrow. In the mean time would a 16 gauge
wire be appropriate to ground the alternator?
Bernie
Sent from my iPhone
> On Oct 13, 2020, at 5:04 PM, Robert L. Nuckolls, III <nuckolls.bob@aeroele
ctric.com> wrote:
>
> =EF=BB At 01:55 PM 10/13/2020, you wrote:
.com>
>>
>> I recently installed Aero Leds wing tip strobes, beacon and wig wag
>> landing lights. I hear no strobe noise with the engine off.
>> However when its running I get noise from the wing tip strobes,
>> wig wag and pitot heat, no noise from the beacon.
>
> When you say 'noise', how would you describe
> it. Is it a musical note or whine that changes
> pitch with engine rpm?
>
>> Any ideas. All shielding according to installation instructions.
>
> Shielding is almost NEVER an issue with the
> symptoms you've described.
>
>> One issue I suspect is the nearby location of the audio plugs
>> to the circuit breakers powering these lights.
>
> Proximity to breakers/breaker wiring is also
> and exceedingly rare prospect for root cause.
>
>> But what difference does the engine running make?
>
> I suspect alternator noise which can't happen
> if the alternator is not putting out power.
> Does the noise go away when you shut the alternator
> OFF with the engine still running?
>
> If you shut all the new systems off and bring
> them on one-at-a-time, does the noise return
> for any combination of functional/non-functional
> systems?
>
> What kind of airplane, engine and alternator?
>
> Wired per any of the z-figures?
>
>
> Bob . . .
Message 3
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| Subject: | Re: strobe noise |
Usually the negative wire needs to be the same size as the positive wire. The
exception is when
the negative current has another path to ground, for instance through mounting
brackets.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498821#498821
Message 4
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| Subject: | Re: strobe noise |
At 10:33 AM 10/14/2020, you wrote:
>Thanks to all of you for the quick responses.
>I=99ll be back to the airplane in a couple days.
>
>It is a 1956 G Bonanza.
Hmmm . . . airplanes of this vintage are
renowned for high resistance airframes which
are fertilizer for ground loop issues.
>Plane power alternator. The strobes and wig wag
>noise is an alternating ping/hum. The
>pitot heat and landing lights are a steady hum. The LED beacon is quiet.
Are all the 'hums' the same pitch and do they
rise and fall with alternator rpm?
>I did found an empty grounding lug on the
>regulator. All of the above elec. devices are grounded
>to a ground buss which is stainless bolted to a bulkhead.
. . . all this happens behind the cabin?
>Older radios are grounded to various unknown places.
>The noise goes away when I shut down the engine
>but haven't tried Turing off the alternator with
>the engine running.
This is key . . . but I'm betting the noise
is unique to the alternator and will go
away with the alternator off. Where is
the battery in this airplane?
>In the mean time would a 16 gauge wire be
>appropriate to ground the alternator?
alternator? above you cited the regulator? If it's
the regulator then don't worry about it. A regulator
ground is never root cause of the constellation of
symptoms you've listed.
Bob . . .
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