---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 10/03/20: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:19 AM - Re: Re: ADS-B and Transponder antenna design... (Robert L. Nuckolls, III) 2. 01:38 PM - Re: Re: voltage monitor (skywagon185guy) 3. 02:05 PM - Re: Re: voltage monitor (Robert L. Nuckolls, III) 4. 09:13 PM - field current supplied from B lead instead of from main bus (johnbright) ________________________________ Message 1 _____________________________________ Time: 09:19:15 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: ADS-B and Transponder antenna design... > > >he described them with pics several days ago. Oh yeah . . . the pix didn't come thru here but okay . . . understand now. Bob . . . ________________________________ Message 2 _____________________________________ Time: 01:38:03 PM PST US From: skywagon185guy Subject: Re: AeroElectric-List: Re: voltage monitor I personally like the idea of a panel light that will make you aware of Under and well as Over voltage conditions. I have experienced an under voltage on start up. Caused by a defective main circuit breaker that opened, but did not show an indication that it had mysteriously opened. Luckily, before beginning the taxi, I noted the amp/volt meter was amiss. Tested the CB and could not get it to reset. Installed new CB and had no additional problems. On Fri, Oct 2, 2020 at 3:41 AM bobnoffs wrote: > > i ordered the tom top unit. for $5 i gotta see how it works. > talked to perihelion and i believe they can build their 'idiot light' > to my specs.this is a panel light with the electronics self contained. > any more suggestions i would like to hear. > thanks, bob noffs > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=498628#498628 > > ________________________________ Message 3 _____________________________________ Time: 02:05:23 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: voltage monitor At 03:35 PM 10/3/2020, you wrote: >I personally like the idea of a panel light that >will make you aware of Under and well as Over voltage conditions. >I have experienced an under voltage on start up. >Caused by a defective main circuit breaker >that opened, but did not show an indication that it had mysteriously opened. Then I take it that your system was not fitted with active notification of low voltage. This feature is the FIRST if not the ONLY voltage sensing/indicating device NECESSARY for flight operations. Preferably, this light is bright (sunlight viewable) and located well within peripheral vision of the pilot. Further, it should flash at 2-3 times per second (a legacy value for optimal attention getting arrived at by numerous human factors studies ). This light has been a no-extra-charge built in feature of virtually all B&C alternator controllers. From day-one (about 35 years ago). It was B&C's mission that no customer would be without BOTH low volts and over volts management. Luckily, before beginning the taxi, I noted the amp/volt meter was amiss. >Tested the CB and could not get it to >reset.=C2 Installed new CB and had no additional problems. Yes, there was an element of luck associated with that experience. I'm pleased the event resolved without a tense-day-in-the-cockpit. Along with active notification of low volts, you should plan on independent management of an over voltage condition with a system that disables the alternator within 500 milliseconds of having exceeded 16 volts. Depending on design parameters of the designer, the ov event will be over very soon thus leaving you with a low volts condition that will be annunciated as cited above. Fit your airplane with those two features and all the other voltmeters, ammeters, beeps and squawks from the panel mounted goodies become mere icing on the cake. Bob . . . ________________________________ Message 4 _____________________________________ Time: 09:13:10 PM PST US Subject: AeroElectric-List: field current supplied from B lead instead of from main bus From: "johnbright" Hi Bob, Someone in my sphere suggested getting field current from the B lead instead of from the main bus. This way if the B lead shorts to ground and the fuselink opens, the field will be de-energized. Marked up snip of Z101B attached. Comments? Thanks -------- John Bright, RV-6A, at FWF, O-360 Z-101 single batt dual alt SDS EM-5-F. john_s_bright@yahoo.com, Newport News, Va https://drive.google.com/drive/folders/1u6GeZo6pmBWsKykLNVQMvu4o1VEVyP4K Read this topic online here: http://forums.matronics.com/viewtopic.php?p=498646#498646 Attachments: http://forums.matronics.com//files/is_connecting_field_supply_to_b_lead_a_good_idea_210.jpg ------------------------------------------------------------------------------------- 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.