AeroElectric-List Digest Archive

Thu 09/02/10


Total Messages Posted: 8



Today's Message Index:
----------------------
 
     1. 07:18 AM - Re: one accessory affecting another ?????? (Robert L. Nuckolls, III)
     2. 07:34 AM - Re: one accessory affecting another ?????? (kgmjeric)
     3. 09:06 AM - Re: Re: one accessory affecting another ?????? (Robert L. Nuckolls, III)
     4. 05:04 PM - Splicing a shielded cable (Jared Yates)
     5. 05:25 PM - Re: Intercom Noise (darnpilot@aol.com)
     6. 05:43 PM - Re: Re: Intercom Noise (Bruce Gray)
     7. 05:48 PM - Re: Re: Intercom Noise (darnpilot@aol.com)
     8. 09:15 PM - Dual Shunts with Dynon EMS (John Volkober)
 
 
 


Message 1


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    Time: 07:18:40 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: one accessory affecting another ??????
    At 10:30 PM 9/1/2010, you wrote: is it common for an intercom to receive different power level based on the radio being turned on or off? they share a common power wire. RADIO turned OFF the intercom led is inbetween red and green and defaulting to co pilot side only RADIO turned ON the intercom led is bright green and functioning well when i say turned on or off I mean that the knob on the radio is turned to the off position or on position the power wire stays hot always Your narration has the "smell" of a noise issue. I'm not familiar with the 'red/green' thing on the intercom and you don't say what kind of radio is involved . . . but here's a WAG. Many modern radios have inverters to supply special power for operation of LCD and/or glow-discharge displays. These are potential antagonists for noise. Will they PROBABLY meet DO-160 requirements for how much noise is pushed back onto the power line, the intercom MIGHT be unusually susceptible. Try operating the intercom from a separate 12v source, like a test battery as described in the noise trouble shooting section of The 'Connection. If this makes the symptoms go away, consider adding a line noise filter in the +14v supply to the intercom. We have a filter you can try . . . if it doesn't do the job, you can return it. Bob . . .


    Message 2


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    Time: 07:34:04 AM PST US
    Subject: Re: one accessory affecting another ??????
    From: "kgmjeric" <ericwp@okstate.edu>
    I am not having the problem with the radio turned on and it pushing backfeeding through the power line but that the intercom will only perform with the radio turned ON Read this topic online here: http://forums.matronics.com/viewtopic.php?p=311070#311070


    Message 3


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    Time: 09:06:22 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: one accessory affecting another ??????
    At 09:32 AM 9/2/2010, you wrote: > >I am not having the problem with the radio turned on and it pushing >backfeeding through the power line but that the intercom will only >perform with the radio turned ON Hmmm . . . blew that WAG out of the water. Still, operating the intercom from a separate power source like a battery would be an interesting thing to do. If two boxes are 'talking' to each other, you need to deduce the propagation pathway. The experiment would confirm/deny the +14v power leads as being part of that pathway. Bob . . .


    Message 4


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    Time: 05:04:54 PM PST US
    Subject: Splicing a shielded cable
    From: Jared Yates <email@jaredyates.com>
    The dynon instructions call for a 4-conductor shielded cable from the panel to the remote compass. I'm planning to put the compass box in the wing, but would like to have a connector at the wing root to facilitate wing removal. What is the best type of connector to use in that case?


    Message 5


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    Time: 05:25:57 PM PST US
    Subject: Re: Intercom Noise
    From: darnpilot@aol.com
    Bob, More data points: I installed a portable intercom in my plane. Its plugged in the new Pilot mic & phone jacks. With only the internal 9v battery powering the unit, I still get the noise in my headsets, but it is tolerable. Intercom off = no noise. When I power the portable intercom from ships power the no ise is louder, but still tolerable...barely. Any ideas now? Jeff Darnall Jacksonville, FL 904-234-8718 __i__ *-----o--o--(_)--o--o-----*


    Message 6


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    Time: 05:43:13 PM PST US
    From: "Bruce Gray" <bgray@glasair.org>
    Subject: Re: Intercom Noise
    I'd say it's time to look at your headsets. Bruce www.Glasair.org -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of darnpilot@aol.com Sent: Thursday, September 02, 2010 8:17 PM Subject: AeroElectric-List: Re: Intercom Noise Bob, More data points: I installed a portable intercom in my plane. Its plugged in the new Pilot mic & phone jacks. With only the internal 9v battery powering the unit, I still get the noise in my headsets, but it is tolerable. Intercom off = no noise. When I power the portable intercom from ships power the noise is louder, but still tolerable...barely. Any ideas now? Jeff Darnall Jacksonville, FL 904-234-8718 __i__ *-----o--o--(_)--o--o-----*


    Message 7


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    Time: 05:48:06 PM PST US
    Subject: Re: Intercom Noise
    From: darnpilot@aol.com
    Bruce. Why? Tell me more? I've used several different type headsets and they all have the same issue . Jeff Darnall Jacksonville, FL 904-234-8718 __i__ *-----o--o--(_)--o--o-----* -----Original Message----- From: Bruce Gray <bgray@glasair.org> Sent: Thu, Sep 2, 2010 8:41 pm Subject: RE: AeroElectric-List: Re: Intercom Noise I=99d say it=99s time to look at your headsets. Bruce www.Glasair.org -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelect ric-list-server@matronics.com] On Behalf Of darnpilot@aol.com Sent: Thursday, September 02, 2010 8:17 PM Subject: AeroElectric-List: Re: Intercom Noise Bob, More data points: I installed a portable intercom in my plane. Its plugged in the new Pilot mic & phone jacks. With only the internal 9v battery powering the unit, I still get the noise in my headsets, but it is tolerable. Intercom off = no noise. When I power the portable intercom from ships power the no ise is louder, but still tolerable...barely. Any ideas now? Jeff Darnall Jacksonville, FL 904-234-8718 __i__ *-----o--o--(_)--o--o-----* - The AeroElectric-List Email Forum - --> http://www.matronics.com/Navigator?AeroElectric-List --> http://www.matronics.com/Navigator?AeroElectric-List - MATRONICS WEB FORUMS - - MATRONICS WEB FORUMS - --> http://forums.matronics.com --> http://forums.matronics.com - List Contribution Web Site - - List Contribution Web Site - Thank you for your generous support! -Matt Dralle, List Admin. --> http://www.matronics.com/contribution ======================== =========== -= - The AeroElectric-List Email Forum - -= Use the Matronics List Features Navigator to browse -= the many List utilities such as List Un/Subscription, -= Archive Search & Download, 7-Day Browse, Chat, FAQ, -= Photoshare, and much much more: - -= --> http://www.matronics.com/Navigator?AeroElectric-List - -======================== ======================== =========== -= - MATRONICS WEB FORUMS - -= Same great content also available via the Web Forums! - -= --> http://forums.matronics.com - -======================== ======================== =========== -= - List Contribution Web Site - -= Thank you for your generous support! -= -Matt Dralle, List Admin. -= --> http://www.matronics.com/contribution -======================== ======================== ===========


    Message 8


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    Time: 09:15:55 PM PST US
    From: "John Volkober" <jvolkober@comcast.net>
    Subject: Dual Shunts with Dynon EMS
    I have an SD-8 auxiliary alternator. I am using the Z-13 wiring scheme which has shunts for the primary and auxiliary alternator. I will be using a Dynon EMS. The Dynon has a single input for ammeter. I want to access the both shunts in the Z-13 wiring scheme. My initial design was to use a DPDT relay connected to the auxiliary alternator switch. With the switch in the off position, the primary alternator shunt would be connected to the EMS. With the switch in the on position the relay would disconnect the primary and connect the auxiliary alternator shunt. Question: Is a simpler alternative to hook both shunts to the single EMS input? And if I did this, would the reading be the sum of the two, if both alternators were active at the same time?




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