Today's Message Index:
----------------------
1. 12:44 AM - Re: Amperage runaway (BobD)
2. 03:43 AM - Re: Re: Amperage runaway (William Daniell)
3. 05:05 AM - alternator whine (Alec Myers)
4. 05:38 AM - Re: alternator whine (Peter Pengilly)
5. 05:55 AM - gps and alternator. (bobnoffs)
6. 06:03 AM - Re: alternator whine (Alec Myers)
7. 08:11 AM - Re: alternator whine (John's Mail)
8. 12:08 PM - Re: gps and alternator. (Ernest Christley)
9. 01:22 PM - Re: gps and alternator. (bob noffs)
10. 02:12 PM - Re: gps and alternator. (Alec Myers)
11. 03:03 PM - Re: gps and alternator. (Charlie England)
Message 1
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| Subject: | Re: Amperage runaway |
Thanks for your response William.
I took your advice, and checked the Shunt ( nothing obvious ). Not flying for the
next few weeks, so will check again when next in the air ( and watch closely
during the ground run ).
I will also be updating the Skyview software to the latest release before the next
flight (although doubt that this is relevant to this particular potential
problem )
--------
Bob Dawson
XS TG || 912 ULS || G-NHRJ
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480575#480575
Message 2
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| Subject: | Re: Amperage runaway |
Ok
Well the good thing is that its unlikely that the rotax generator will put
out anything over 17amps so you're unlikely to have sparks and smoke.
I have just installed a cheap hall effect ammeter because because my dynon
did an uncommanded reset in flight. This brought to mind the need for back
of flight and key engine instruments.
That said in general terms i like the dynon very much but like any gizmo it
can fail.
Will
Xs tri 912 turbo dynon airmaster
On Sat, Jun 2, 2018, 02:49 BobD <rjd@bobdawson.plus.com> wrote:
>
> Thanks for your response William.
> I took your advice, and checked the Shunt ( nothing obvious ). Not flying
> for the next few weeks, so will check again when next in the air ( and
> watch closely during the ground run ).
> I will also be updating the Skyview software to the latest release before
> the next flight (although doubt that this is relevant to this particular
> potential problem )
>
> --------
> Bob Dawson
> XS TG || 912 ULS || G-NHRJ
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=480575#480575
>
>
Message 3
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| Subject: | alternator whine |
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 doesnt change when the intercom volume or the volume
of any of the radios or other avionics are adjusted
-its 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?
Message 4
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| Subject: | Re: alternator whine |
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@alecmyers.com> wrote:
>
> 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=99t change when the intercom volu
me or the
> volume of any of the radios or other avionics are adjusted
> -it=99s present regardless if any audio source is selected in the a
udio 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?
>
>
===========
===========
===========
===========
===========
>
>
Message 5
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| Subject: | gps and alternator. |
hi all,
i have a really easy place to mount my gps antennas under the cowl but they would
be within 4' of the alternator. will i be asking for trouble?
thanks,
bob noffs
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480579#480579
Message 6
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| Subject: | Re: alternator whine |
That has been done.
On Jun 2, 2018, at 08:36, Peter Pengilly <peter@sportingaero.com> wrote:
I had similar symptoms, cured by grounding everything in the panel to a sing
le point.
Peter
> On Sat, 2 Jun 2018, 13:14 Alec Myers, <alec@alecmyers.com> wrote:
>
> Bob et al.
>
> Where should I start looking to fix an annoying alternator whine in my hea
dset?
>
> Features:
> -the pitch of the whine is RPM dependent
> -the amplitude is fixed and doesn=99t change when the intercom volum
e or the volume of any of the radios or other avionics are adjusted
> -it=99s present regardless if any audio source is selected in the au
dio panel
> -it goes away when the intercom is unpowered
>
> I am thinking the intercom (a PM2000) has poor noise rejection on the volt
age rail; or is it something that should be investigated at the alternator/v
oltage regulator end?
>
>
>
>
> ==========
> -
> Electric-List" rel="noreferrer noreferrer" target="_blank">http://www.
matronics.com/Navigator?AeroElectric-List
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ontribution
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Message 7
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| Subject: | Re: alternator whine |
I have had a similar whine develop suddenly after months of normal quiet aud
io at least 3 times and returned the alternator to manufacturer. All were re
placed because of either loss of a winding or loss of a rectifying diode res
ulting 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@alecmyers.com> wrote:
>
> That has been done.
>
> On Jun 2, 2018, at 08:36, Peter Pengilly <peter@sportingaero.com> wrote:
>
> I had similar symptoms, cured by grounding everything in the panel to a si
ngle point.
> Peter
>
>> On Sat, 2 Jun 2018, 13:14 Alec Myers, <alec@alecmyers.com> wrote:
>>
>> Bob et al.
>>
>> Where should I start looking to fix an annoying alternator whine in my he
adset?
>>
>> Features:
>> -the pitch of the whine is RPM dependent
>> -the amplitude is fixed and doesn=99t change when the intercom volu
me or the volume of any of the radios or other avionics are adjusted
>> -it=99s present regardless if any audio source is selected in the a
udio panel
>> -it goes away when the intercom is unpowered
>>
>> I am thinking the intercom (a PM2000) has poor noise rejection on the vol
tage rail; or is it something that should be investigated at the alternator/
voltage regulator end?
>>
>>
>>
>>
>> ==========
>> -
>> Electric-List" rel="noreferrer noreferrer" target="_blank">http://www
.matronics.com/Navigator?AeroElectric-List
>> ==========
>> FORUMS -
>> 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
>> ==========
>>
>>
>>
Message 8
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| Subject: | Re: gps and alternator. |
The frequency that GPS works at is so far above anything the alternator pro
duces, I can't imagine them ever being able to cross talk.
On Saturday, June 2, 2018 8:56 AM, bobnoffs <icubob@gmail.com> wrote:
hi all,
i have a really easy place to mount my gps antennas under the cowl but the
y would be within 4' of the alternator. will i be asking for trouble?
thanks,
bob noffs
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480579#480579
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Message 9
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| Subject: | Re: gps and alternator. |
thanks, good news ernest.
bob
<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon>
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On Sat, Jun 2, 2018 at 2:08 PM, Ernest Christley <echristley@att.net> wrote:
> The frequency that GPS works at is so far above anything the alternator
> produces, I can't imagine them ever being able to cross talk.
>
>
> On Saturday, June 2, 2018 8:56 AM, bobnoffs <icubob@gmail.com> wrote:
>
>
>
> hi all,
> i have a really easy place to mount my gps antennas under the cowl but
> they would be within 4' of the alternator. will i be asking for trouble?
> thanks,
> bob noffs
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=480579#480579
>
>
> http://www.matronics.com/Navigator?AeroElectric-List<= Same great content
> also available via the Web Forums!
> http://forums.matronics.com
> http://www.matronics.com/contribution===================
>
>
Message 10
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| Subject: | Re: gps and alternator. |
But a GPS antenna needs a good view of the sky. They=99re usually moun
ted on top of the aircraft, not under it.
On Jun 2, 2018, at 16:21, bob noffs <icubob@gmail.com> wrote:
thanks, good news ernest.
bob
Virus-free. www.avast.com
> On Sat, Jun 2, 2018 at 2:08 PM, Ernest Christley <echristley@att.net> wrot
e:
> The frequency that GPS works at is so far above anything the alternator pr
oduces, I can't imagine them ever being able to cross talk.
>
>
> On Saturday, June 2, 2018 8:56 AM, bobnoffs <icubob@gmail.com> wrote:
>
>
>
> hi all,
> i have a really easy place to mount my gps antennas under the cowl but the
y would be within 4' of the alternator. will i be asking for trouble?
> thanks,
> bob noffs
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=480579#480579
>
>
>
>
> http://www.matronics.com/Navigator?AeroElectric-List<= Same great conten
t also available via the Web Forums!
> http://forums.matronics.com
> http://www.matronics.com/contribution=============
======
>
>
>
>
>
Message 11
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| Subject: | Re: gps and alternator. |
If what you heard on the interwebs is worth anything to you, I'm aware
of numerous RV-x a/c builders that say they have installed a shelf high
on the firewall in the engine compartment and have excellent GPS
performance. The newer stuff is so good, it's much better at locking on
to signals than we might expect. And at least for the newer VFR stuff,
many of the receivers will use whatever is in the sky at the moment; US,
Euro, Russian, etc. So the odds of seeing four of *somebody's*
satellites are really good.
For temperatures, I'm not really sure which is worse; 140-150 degree air
under the cowl while flying, or about the same temps (possibly worse,
where I live) continuously if the plane is left in the sun on the ground
and the puck is mounted on the glare shield.
Charlie
On 6/2/2018 4:11 PM, Alec Myers wrote:
> But a GPS antenna needs a good view of the sky. Theyre usually
> mounted on top of the aircraft, not under it.
>
> On Jun 2, 2018, at 16:21, bob noffs <icubob@gmail.com
> <mailto:icubob@gmail.com>> wrote:
>
> thanks, good news ernest.
> bob
>
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon>
> Virus-free. www.avast.com
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link>
>
>
> On Sat, Jun 2, 2018 at 2:08 PM, Ernest Christley <echristley@att.net
> <mailto:echristley@att.net>> wrote:
>
> The frequency that GPS works at is so far above anything the
> alternator produces, I can't imagine them ever being able to cross
> talk.
>
>
> On Saturday, June 2, 2018 8:56 AM, bobnoffs <icubob@gmail.com
> <mailto:icubob@gmail.com>> wrote:
>
>
> <icubob@gmail.com <mailto:icubob@gmail.com>>
>
> hi all,
> i have a really easy place to mount my gps antennas under the cowl
> but they would be within 4' of the alternator. will i be asking
> for trouble?
> thanks,
> bob noffs
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=480579#480579
> <http://forums.matronics.com/viewtopic.php?p=480579#480579>
>
>
> http://www.matronics.com/Navigator?AeroElectric-List
> <http://www.matronics.com/Navigator?AeroElectric-List><= Same
> great content also available via the Web Forums!
> http://forums.matronics.com
> http://www.matronics.com/contribution
> <http://www.matronics.com/contribution>===================
>
>
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