---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 11/19/17: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 10:09 AM - Please Make a Contribution to Support Your Lists... (Matt Dralle) 1. 10:11 AM - Re: AeroElectric-List Digest: 3 Msgs - 11/16/17 (Gregg Sneek) 2. 11:56 AM - Re: Schottky diode (Carlos Trigo) 3. 05:08 PM - Re: Schottky diode (Robert L. Nuckolls, III) ________________________________ Message 0 _____________________________________ Time: 10:09:35 AM PST US From: Matt Dralle Subject: AeroElectric-List: Please Make a Contribution to Support Your Lists... Dear Listers, Just a reminder that November is the Annual List Fund Raiser. Please make a Contribution today to support the continued operation and upgrade of these great List services!! Pick up a really nice free gift with your qualifying Contribution too! The Contribution Site is fast and easy: http://www.matronics.com/contribution or by dropping a personal check in the mail to: Matt Dralle / Matronics 581 Jeannie Way Livermore CA 94550 Thank you! Matt Dralle Matronics Email List Administrator ________________________________ Message 1 _____________________________________ Time: 10:11:33 AM PST US From: Gregg Sneek Subject: AeroElectric-List: Re: AeroElectric-List Digest: 3 Msgs - 11/16/17 Please unsubscribe me. Get Outlook for Android ________________________________ From: owner-aeroelectric-list-server@matronics.com on behalf of AeroElectric-List Digest Server Sent: Friday, November 17, 2017 2:01:39 AM Subject: AeroElectric-List Digest: 3 Msgs - 11/16/17 * ======================== Online Versions of Today's List Digest Archive ======================== Today's complete AeroElectric-List Digest can also be found in either of th e two Web Links listed below. The .html file includes the Digest formatted in HTML for viewing with a web browser and features Hyperlinked Indexes and Message Navigation. The .txt file includes the plain ASCII version of the AeroElectric-List Digest and can be viewed with a generic text edito r such as Notepad or with a web browser. HTML Version: http://www.matronics.com/digest/digestview.php?Style=82701&View=htm l&Chapter 17-11-16&Archive=AeroElectric Text Version: http://www.matronics.com/digest/digestview.php?Style=82701&View=txt &Chapter 17-11-16&Archive=AeroElectric ======================== ======================= EMail Version of Today's List Digest Archive ======================== ======================= ---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 11/16/17: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:11 PM - Re: Simple EFIS backup battery wiring (user9253) 2. 09:45 PM - Re: Constructing an automatic RCA video camera feed spli tter (Airdog77) 3. 10:19 PM - Re: Constructing an automatic RCA video camera feed spli tter (Eric Page) ________________________________ Message 1 ______________________________ _______ Time: 02:11:50 PM PST US Subject: AeroElectric-List: Re: Simple EFIS backup battery wiring From: "user9253" Good job Eric Page. Some aircraft owners and/or builders will appreciate y our work. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=475094#475094 ________________________________ Message 2 ______________________________ _______ Time: 09:45:53 PM PST US Subject: AeroElectric-List: Re: Constructing an automatic RCA video camera feed splitter From: "Airdog77" Eric & Alec, > Once we hear from Wade that his EFIS and video adapter handle the camera feed switching OK, I'll edit the schematic and work on a board layout. Just wanted to let you guys know I hooked up 3 cameras to the switching uni t that you recommended Eric and fed it into the GRT EFIS via the switching unit's RCA jack out into the USB adapter. The switching worked fine, albeit their is a VERY brief (less than half a s econd) skewing of the screen as it goes from one video input to the other. You ha ve to be looking right at it to see it. Again, it all looked fine to me. If we could eliminate the skewing it'd be nice, but definitely not a showstopper. Cheers, Wade -------- Airdog Wade Parton Building Long-EZ N916WP www.longezpush.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=475098#475098 ________________________________ Message 3 ______________________________ _______ Time: 10:19:11 PM PST US Subject: AeroElectric-List: Re: Constructing an automatic RCA video camera feed splitter From: "Eric Page" Airdog77 wrote: > The switching worked fine, albeit their is a VERY brief (less than half a second) skewing of the screen as it goes from one video input to the other. You have to be looking right at it to see it. I'm glad to hear it works OK and the EFIS doesn't lose sync on the video si gnal. Thinking out loud here... the brief skewing you see may have something to d o with the mechanical switch. Perhaps it's a break-before-make type, so for several milliseconds there's no signal present. With the switching done electronic ally, the loss of signal will be reduced to a few tens of nanoseconds, so that issue *may* disappear. Eric Read this topic online here: http://forums.matronics.com/viewtopic.php?p=475099#475099 ________________________________ Message 2 _____________________________________ Time: 11:56:47 AM PST US From: "Carlos Trigo" Subject: RE: AeroElectric-List: Schottky diode Hi Bob Please see my answers below De: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] Em nome de Robert L. Nuckolls, III Enviada: Friday, November 17, 2017 11:04 PM Para: aeroelectric-list@matronics.com Assunto: Re: AeroElectric-List: Schottky diode At 10:53 AM 11/17/2017, you wrote: > Guys In my RV-10 electric system, with 2 batteries and 2 alternators (the Primary ALT being a Plane Power 60A, and the Secondary ALT being a BC410-H, formerly known as SD-20), I have a Main Battery contactor and an Aux Battery contactor. This being, unless I have the Aux Batt contactor On (closed), the Alternators will not charge the Aux battery. Therefore, I am thinking in installing a Schottky diode (I have one from Perihelion Design sitting in my shelf, which is rated at 60A of maximum allowable continuous current, and voltage loss around 0,20V), between the Main battery Buss and the Aux battery + terminal, to allow the alternators who are charging the Main battery, also to charge the Aux battery, even when the Aux BATT contactor is not closed. First question: is there any downside to this solution, or is it even not recommended at all? Second question (or more...): in this solution, I should put a fuse in the wire between the Main Batt buss and the Schottky diode, to protect this wire, right? Which is the A recommended for this fuse, 30 A? And by the way, which wire gauge, AWG#12? Regards Carlos Why not wire like Z-12 with a z-30 second battery? You're spot on, I do have both arquitectures in my system: - like in Z-12, the B-Leads of my 2 alternators are both connected to the same lug in the Starter contactor, thus both alternators charge the Main Battery - like in Z-30, the Aux battery is connected, through the Aux Batt. Contactor, to the downstream lug of the Main Batt contactor, thus the Aux battery will act as a direct "reinforcement" for the Main battery Are you planning to have battery bus(es)? Which electro-whizzies will run from each bus? I have what you call a "Battery bus" and I called an "Always Hot buss", directly connected to the Main Battery, only to power the Fuel boost pump and a cockpit light And I have what I called an "Avionics Backup buss", which gets power directly from the Aux battery, through a dedicated relay/contactor, to the secondary power inputs of all my GARMIN Avionics Why not fly with both battery contactors closed? In this case, this is indeed the one-million-dollar question. My initial request was about to put an extra wire and a Schottky diode, between the Main battery buss and the Aux battery + terminal, to be able to charge the Aux battery without closing the Aux Batt contactor. And this idea had 2 backgrounds: in case the pilot forgets to turn On the Aux Batt contactor, or in case he doesn't want to turn it On, to "save" the Aux Battery power (this last being probably a dumb idea). What do you think about your own question? Carlos ________________________________ Message 3 _____________________________________ Time: 05:08:25 PM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: Schottky diode > > Why not wire like Z-12 with a z-30 second battery? > >You're spot on, I do have both arquitectures in my system: > - like in Z-12, the B-Leads of my 2 alternators are both > connected to the same lug in the Starter contactor, thus both > alternators charge the Main Battery Are you intending to use the LR3 generic controller or the SB1B-14 controller specific to stand-by service? > - like in Z-30, the Aux battery is connected, through the Aux > Batt. Contactor, to the downstream lug of the Main Batt contactor, > thus the Aux battery will act as a direct "reinforcement" for the Main battery Okay . . . > >Are you planning to have battery bus(es)? Which electro-whizzies >will run from each bus? > >I have what you call a "Battery bus" and I called an "Always Hot >buss", directly connected to the Main Battery, only to power the >Fuel boost pump and a cockpit light >And I have what I called an "Avionics Backup buss", which gets power >directly from the Aux battery, through a dedicated relay/contactor, >to the secondary power inputs of all my GARMIN Avionics Understand . . . > >Why not fly with both battery contactors closed? > >In this case, this is indeed the one-million-dollar question. >My initial request was about to put an extra wire and a Schottky >diode, between the Main battery buss and the Aux battery + terminal, >to be able to charge the Aux battery without closing the Aux Batt contactor. >And this idea had 2 backgrounds: in case the pilot forgets to turn >On the Aux Batt contactor, I really get exercised over the phrase, "Pilot forgets" . . . Pilots in control of their airplanes don't forget actions necessary for competent use of the machine . . . pilots along for the ride are at risk for unhappy days far worse than improperly positioned controls . . . check lists used a few dozen times become as automatic as breathing. > . . . or in case he doesn't want to turn it On, to "save" the Aux > Battery power (this last being probably a dumb idea). >What do you think about your own question? A significant advantage of two batteries is the ability to isolate the 'avionics' battery during cranking to side step brown-out issues. The disadvantage is added weight . . . and 2x the cost of ownership for battery maintenance efforts . . . added complexity. With two alternators, battery only endurance is insignificant. Hence no reason to fret over battery capability beyond that need to get the engine running. It occurs to me that I've never measured the brownout characteristics of the lithium ion products. Given their significantly lower source impedance, it just might be that these engine cranking sources would support the bus at or above the brown-out limits of the glass-panel products with weak-knees. Has anyone on the List explored this? My Sedona has a PM starter on it. I'll put a task on the to-do bucket to capture a cranking event trace on the EXP36 battery I have on hand. Except for mitigation of a brown-out event (which generally lasts a less than 100 milliseconds), I'm having trouble warming up to a two-battery configuration. With two alternators a well maintained battery, I can't think of any other failure scenario where two batteries are going to yield a return on investment. Can't think of a reason your 'avionics bus' should be any different than the legacy e-bus. Bob . . . ------------------------------------------------------------------------------------- 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.