AeroElectric-List Digest Archive

Fri 11/20/15


Total Messages Posted: 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


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    Time: 09:14:45 AM PST US
    From: Matt Dralle <dralle@matronics.com>
    Subject: 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


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    Time: 05:53:27 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: 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


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    Time: 05:55:02 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: 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


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    Time: 05:56:17 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: 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


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    Time: 05:58:15 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: 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


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    Time: 08:26:36 AM PST US
    Subject: Re: ptt isolation
    From: "user9253" <fransew@gmail.com>
    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


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    Time: 12:47:21 PM PST US
    Subject: Re: ptt isolation
    From: Bill Maxwell <wrmaxwell@bigpond.com>
    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


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    Time: 05:06:00 PM PST US
    Subject: Re: Rotax ignition wiring
    From: Richard Girard <aslsa.rng@gmail.com>
    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 <http://www.goodreads.com/author/show/43244.Groucho_Marx>




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