---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 08/06/16: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:06 AM - Re: Garmin GTX 335 Install nonsense(?) (rampil) 2. 10:22 AM - Battery charging (Steve Kelly) 3. 12:02 PM - Re: Battery charging (user9253) ________________________________ Message 1 _____________________________________ Time: 08:06:41 AM PST US Subject: AeroElectric-List: Re: Garmin GTX 335 Install nonsense(?) From: "rampil" First, and most important, and Im sure you know that TSO installation instructions do not apply to you. Theoretically, the benefit of ground planes increases with size, in the limit, a ground (surface of the earth) antenna ground plane which is the entire earth is optimal. However the benefit decreases exponentially with size. Modern "active" gps antennae have a ground plane which is a fraction of an inch on a side and they are designed to work just fine. It does have a ground plane, it is just encapsulated inside that plastic lump. Transponder transmitter antennae have slightly more critical requirements to optimize impedance load and transmission pattern. If your transponder performance was OK with existing antenna, it will almost certainly work with the new one. -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=459263#459263 ________________________________ Message 2 _____________________________________ Time: 10:22:13 AM PST US Subject: AeroElectric-List: Battery charging From: "Steve Kelly" I have a small 9ah sealed lead-acid battery in the back of my plane that I use mainly to operate some things on the ground without having to use the main battery which is on the firewall. It is also available, should I need it in flight to power a few items such as the com or the flight display. This battery feeds buss #2 with a #14 wire, again coming from the back of the plane. I have been charging this with a battery charger, but would like to be able to charge it off the main buss when the engine is running. My thoughts are to run another wire back to the battery from the main buss with a diode and a resistor of some sort to limit the current so the wire (or fuse) doesn't burn up. Am I on the right track here? I have some 3A diodes here and hopefully can use a #20 wire. No idea what to use for a resistor value or if this would even work. I would appreciate any feedback on this idea. Thanks, Steve -------- Steve Read this topic online here: http://forums.matronics.com/viewtopic.php?p=459270#459270 ________________________________ Message 3 _____________________________________ Time: 12:02:35 PM PST US Subject: AeroElectric-List: Re: Battery charging From: "user9253" How about connecting buss #1 & #2 together with a DSS 2x121-0045B Schottky diode? Doing that will be electrically the same as your proposal, except that the wire will be shorter and no additional fuse or resistor is used. It is unlikely that the fuse protecting the existing 14 AWG wire will ever blow from charging current, unless the aux battery is completely run down or defective. Have you ever seen the aux battery charging current go above 15 amps? The diode will drop about 0.3 to 0.35 volts at your intended load current. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=459274#459274 ------------------------------------------------------------------------------------- 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.