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alternator whine

 
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alec(at)alecmyers.com
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PostPosted: Sat Jun 02, 2018 4:05 am    Post subject: alternator whine Reply with quote

Bob et al.

Where should I start looking to fix an annoying alternator whine in my headset?

Features:
-the pitch of the whine is RPM dependent
-the amplitude is fixed and doesn’t change when the intercom volume or the volume of any of the radios or other avionics are adjusted
-it’s present regardless if any audio source is selected in the audio panel
-it goes away when the intercom is unpowered

I am thinking the intercom (a PM2000) has poor noise rejection on the voltage rail; or is it something that should be investigated at the alternator/voltage regulator end?


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peter(at)sportingaero.com
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PostPosted: Sat Jun 02, 2018 4:38 am    Post subject: alternator whine Reply with quote

I had similar symptoms, cured by grounding everything in the panel to a single point.Peter
On Sat, 2 Jun 2018, 13:14 Alec Myers, <alec(at)alecmyers.com (alec(at)alecmyers.com)> wrote:

Quote:
--> AeroElectric-List message posted by: Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)>

Bob et al.

Where should I start looking to fix an annoying alternator whine in my headset?

Features:
-the pitch of the whine is RPM dependent
-the amplitude is fixed and doesn’t change when the intercom volume or the volume of any of the radios or other avionics are adjusted
-it’s present regardless if any audio source is selected in the audio panel
-it goes away when the intercom is unpowered

I am thinking the intercom (a PM2000) has poor noise rejection on the voltage rail; or is it something that should be investigated at the alternator/voltage regulator end?




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alec(at)alecmyers.com
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PostPosted: Sat Jun 02, 2018 5:03 am    Post subject: alternator whine Reply with quote

That has been done.

On Jun 2, 2018, at 08:36, Peter Pengilly <peter(at)sportingaero.com (peter(at)sportingaero.com)> wrote:
I had similar symptoms, cured by grounding everything in the panel to a single point.Peter
On Sat, 2 Jun 2018, 13:14 Alec Myers, <alec(at)alecmyers.com (alec(at)alecmyers.com)> wrote:

Quote:
--> AeroElectric-List message posted by: Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)>

Bob et al.

Where should I start looking to fix an annoying alternator whine in my headset?

Features:
-the pitch of the whine is RPM dependent
-the amplitude is fixed and doesn’t change when the intercom volume or the volume of any of the radios or other avionics are adjusted
-it’s present regardless if any audio source is selected in the audio panel
-it goes away when the intercom is unpowered

I am thinking the intercom (a PM2000) has poor noise rejection on the voltage rail; or is it something that should be investigated at the alternator/voltage regulator end?




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Electric-List" rel="noreferrer noreferrer" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
===========
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eferrer noreferrer" target="_blank">http://forums.matronics.com
===========
WIKI -
errer noreferrer" target="_blank">http://wiki.matronics.com
===========
b Site -
-Matt Dralle, List Admin.
rel="noreferrer noreferrer" target="_blank">http://www.matronics.com/contribution
===========





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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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n81jg(at)aol.com
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PostPosted: Sat Jun 02, 2018 7:11 am    Post subject: alternator whine Reply with quote

I have had a similar whine develop suddenly after months of normal quiet audio at least 3 times and returned the alternator to manufacturer. All were replaced because of either loss of a winding or loss of a rectifying diode resulting in a ripple DC creating the whine.John Greaves
RV7A and Varieze

Sent from my iPhone

On Jun 2, 2018, at 6:02 AM, Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)> wrote:
Quote:

That has been done.

On Jun 2, 2018, at 08:36, Peter Pengilly <peter(at)sportingaero.com (peter(at)sportingaero.com)> wrote:
I had similar symptoms, cured by grounding everything in the panel to a single point.Peter
On Sat, 2 Jun 2018, 13:14 Alec Myers, <alec(at)alecmyers.com (alec(at)alecmyers.com)> wrote:

Quote:
--> AeroElectric-List message posted by: Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)>

Bob et al.

Where should I start looking to fix an annoying alternator whine in my headset?

Features:
-the pitch of the whine is RPM dependent
-the amplitude is fixed and doesn’t change when the intercom volume or the volume of any of the radios or other avionics are adjusted
-it’s present regardless if any audio source is selected in the audio panel
-it goes away when the intercom is unpowered

I am thinking the intercom (a PM2000) has poor noise rejection on the voltage rail; or is it something that should be investigated at the alternator/voltage regulator end?




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===========
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eferrer noreferrer" target="_blank">http://forums.matronics.com
===========
WIKI -
errer noreferrer" target="_blank">http://wiki.matronics.com
===========
b Site -
-Matt Dralle, List Admin.
rel="noreferrer noreferrer" target="_blank">http://www.matronics.com/contribution
===========








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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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