---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 11/20/15: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 09:14 AM - Please Make a Contribution to Support Your Lists... (Matt Dralle) 1. 05:53 AM - Re: Rotax ignition wiring (Robert L. Nuckolls, III) 2. 05:55 AM - Re: Re: Rotax ignition wiring (Robert L. Nuckolls, III) 3. 05:56 AM - Re: Re: ptt isolation (Robert L. Nuckolls, III) 4. 05:58 AM - Re: Re: ptt isolation (Robert L. Nuckolls, III) 5. 08:26 AM - Re: ptt isolation (user9253) 6. 12:47 PM - Re: Re: ptt isolation (Bill Maxwell) 7. 05:06 PM - Re: Re: Rotax ignition wiring (Richard Girard) ________________________________ Message 0 _____________________________________ Time: 09:14:45 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: 05:53:27 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Rotax ignition wiring At 09:12 PM 11/19/2015, you wrote: > >This may be a dumb question, but would using a shielded twisted pair >for the combined ignition control wiring to both modules be OK, or >are 2 individual shielded single conductor wires preferred for some >reason? I am basically using Bob's Z-16 diagram... I am very >grateful to have that, Bob! My pleasure. What you propose would be fine. Do you already have some twisted pair 20 or 18AWG? Bob . . . ________________________________ Message 2 _____________________________________ Time: 05:55:02 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Rotax ignition wiring At 09:46 PM 11/19/2015, you wrote: > >It is better to have individual wires for each ignition to prevent >one electrical problem from disabling both ignitions. The shield on >each ignition wire (on my Rotax powered RV-12) is separated in the >middle. The shield is grounded at each end. I suspect that Van's >designed it that way to prevent starter current from burning open >the shield if the engine ground wire ever breaks. Interesting . . . not sure I understand why that would be 'better' . . . I like to see the designer's white paper on the thought process. Bob . . . ________________________________ Message 3 _____________________________________ Time: 05:56:17 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: ptt isolation At 07:53 PM 11/19/2015, you wrote: > >I was planning on using the intercom feature. I am trying to get some >information on how to wire the unit before I install it. It will be >couple of months before I will do the installation. Okay, let's talk about it a bit. I'm packing to go to Wichita today . . . got a garage door opener to install. We'll pick up this thread tomorrow. Bob . . . ________________________________ Message 4 _____________________________________ Time: 05:58:15 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: ptt isolation At 11:17 AM 11/19/2015, you wrote: > >I was wanting to disable the copilots transmit function when the pilots >ptt was activated & disabling the pilots transmit function when the >copilots ptt was activated. What I am trying to accomplish is not have > both mics on when only one ptt is activated. The flightline wiring >diagram lists a isolation relay board which is no longer available. >Thanks for the replies I believe Chuck's suggestion earlier this thread accomplishes a talker-priority access to the transmitter. You might study that a bit and see if it's suited to your planning. Bob . . . ________________________________ Message 5 _____________________________________ Time: 08:26:36 AM PST US Subject: AeroElectric-List: Re: ptt isolation From: "user9253" Attached is a PTT circuit using two DPDT relays. Both mics are normally connected for intercom use. If one pilot presses her PTT switch, the other pilot's mic is disabled. A disadvantage of this circuit is that if both PTT switches are pressed, both mics will be disabled. Of course the pilot will realize this when the side tone goes quiet. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=449764#449764 Attachments: http://forums.matronics.com//files/ptt_relays_556.pdf ________________________________ Message 6 _____________________________________ Time: 12:47:21 PM PST US Subject: Re: AeroElectric-List: Re: ptt isolation From: Bill Maxwell Bt leaves the intercom function to be addressed, methinks... Bill On 21/11/2015 12:57 AM, Robert L. Nuckolls, III wrote: > At 11:17 AM 11/19/2015, you wrote: >> >> I was wanting to disable the copilots transmit function when the pilots >> ptt was activated & disabling the pilots transmit function when the >> copilots ptt was activated. What I am trying to accomplish is not have >> both mics on when only one ptt is activated. The flightline wiring >> diagram lists a isolation relay board which is no longer available. >> Thanks for the replies > > I believe Chuck's suggestion earlier this > thread accomplishes a talker-priority access > to the transmitter. You might study that > a bit and see if it's suited to your > planning. > > > Bob . . . > ________________________________ Message 7 _____________________________________ Time: 05:06:00 PM PST US Subject: Re: AeroElectric-List: Re: Rotax ignition wiring From: Richard Girard All, The ignition modules and the pickups together cost almost $4,000 to replace. A few feet of shielded wire costs what, $1.49? I'd wire it exactly as Rotax says rather than experiment. Rick Girard On Fri, Nov 20, 2015 at 7:53 AM, Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > At 09:46 PM 11/19/2015, you wrote: > > > It is better to have individual wires for each ignition to prevent one > electrical problem from disabling both ignitions. The shield on each > ignition wire (on my Rotax powered RV-12) is separated in the middle. Th e > shield is grounded at each end. I suspect that Van's designed it that wa y > to prevent starter current from burning open the shield if the engine > ground wire ever breaks. > > > Interesting . . . not sure I understand > why that would be 'better' . . . I like > to see the designer's white paper on the > thought process. > > Bob . . . > -- =9CBlessed are the cracked, for they shall let in the light.=9D Groucho Marx ------------------------------------------------------------------------------------- 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.