Today's Message Index:
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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)
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Subject: | Please Make a Contribution to Support Your Lists... |
Dear Listers,
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Matt Dralle
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Message 1
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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 . . .
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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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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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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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Subject: | Re: ptt isolation |
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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Subject: | Re: ptt isolation |
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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Subject: | Re: Rotax ignition wiring |
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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