---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 06/02/18: 11 ---------------------------------------------------------- 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 _____________________________________ Time: 12:44:58 AM PST US Subject: AeroElectric-List: Re: Amperage runaway From: "BobD" 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 _____________________________________ Time: 03:43:36 AM PST US From: William Daniell Subject: Re: AeroElectric-List: 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 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 _____________________________________ Time: 05:05:29 AM PST US From: Alec Myers Subject: AeroElectric-List: 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 _____________________________________ Time: 05:38:53 AM PST US From: Peter Pengilly Subject: Re: AeroElectric-List: 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, 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 _____________________________________ Time: 05:55:02 AM PST US Subject: AeroElectric-List: gps and alternator. From: "bobnoffs" 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 _____________________________________ Time: 06:03:11 AM PST US From: Alec Myers Subject: Re: AeroElectric-List: alternator whine That has been done. On Jun 2, 2018, at 08:36, Peter Pengilly 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, 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 > ========== > 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/c ontribution > ========== > > > ________________________________ Message 7 _____________________________________ Time: 08:11:14 AM PST US From: "John's Mail" Subject: Re: AeroElectric-List: 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 wrote: > > That has been done. > > On Jun 2, 2018, at 08:36, Peter Pengilly 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, 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 _____________________________________ Time: 12:08:49 PM PST US From: Ernest Christley Subject: Re: AeroElectric-List: 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 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 - S - WIKI - - =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin. ________________________________ Message 9 _____________________________________ Time: 01:22:10 PM PST US From: bob noffs Subject: Re: AeroElectric-List: gps and alternator. thanks, good news ernest. bob Virus-free. www.avast.com <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Sat, Jun 2, 2018 at 2:08 PM, Ernest Christley 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 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 ____________________________________ Time: 02:12:42 PM PST US From: Alec Myers Subject: Re: AeroElectric-List: 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 wrote: thanks, good news ernest. bob Virus-free. www.avast.com > On Sat, Jun 2, 2018 at 2:08 PM, Ernest Christley 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 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 ____________________________________ Time: 03:03:01 PM PST US Subject: Re: AeroElectric-List: gps and alternator. From: Charlie England 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 > wrote: > > thanks, good news ernest. > bob > > > Virus-free. www.avast.com > > > > On Sat, Jun 2, 2018 at 2:08 PM, Ernest Christley > 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 > 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 > =================== > > --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.