AeroElectric-List Digest Archive

Tue 10/09/12


Total Messages Posted: 10



Today's Message Index:
----------------------
 
     1. 12:38 AM - Re: Re: OEM or home-made ELT antennas? (Mike Wynn)
     2. 02:10 AM - Using Dynon EMS together with VDO gauge (peterthomson)
     3. 05:21 AM - Re: Using Dynon EMS together with VDO gauge (peterthomson)
     4. 07:53 AM - Re: Right Angle Fast-on (MLWynn@aol.com)
     5. 07:55 AM - Re: Right Angle Fast-on (MLWynn@aol.com)
     6. 09:34 AM - Re: Re: Using Dynon EMS together with VDO gauge (Paul Kuntz)
     7. 12:33 PM - Re: Right Angle Fast-on (Robert L. Nuckolls, III)
     8. 05:21 PM - Another grounding question (tomcostanza)
     9. 06:39 PM - Slobovia Pumpkin Drop 2012 invitation (Charlie England)
    10. 06:56 PM - Re: Another grounding question (Robert L. Nuckolls, III)
 
 
 


Message 1


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    Time: 12:38:20 AM PST US
    From: "Mike Wynn" <wynaire@citlink.net>
    Subject: Re: OEM or home-made ELT antennas?
    Thanks for the info. Good point as well. My NOS ACK ELT was never installed in an ac, but is certified to C91a, fortunately. Luck of the Irish.. And an OEM antenna is on order. Mike W. ****************** ----- Original Message ----- From: "dlj04" <dlj04@josephson.com> Sent: Monday, October 08, 2012 7:20 PM Subject: AeroElectric-List: Re: OEM or home-made ELT antennas? > > TSO requirements are not necessarily associated with the airframe > certification, but in order to operate in the national airspace system > certain "approved" items are needed, such as ELTs and transponders. The > requirement is in Part 91 (general operating and flight rules), not Part > 23 or some other airworthiness requirement so it's the same for all > aircraft. > > Many early ELTs had very primitive circuit designs in order to operate at > 121.5 and 243 MHz, which resulted in antennas that didn't look like > traditional quarter-wave whips at either frequency. The antenna is part of > the design. > > Also, if you are to operate an aircraft with an ELT installed after March > 1998, in order to be "approved" it has to be certified to TSO C91a, not > the older C91. Many of the bargain ELTs in flymarkets work, but are > illegal to use once they have been removed from the aircraft in which they > were originally installed. If you have a C91 ELT there had better be a > logbook entry documenting its installation prior to 1998. > > >


    Message 2


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    Time: 02:10:20 AM PST US
    Subject: Using Dynon EMS together with VDO gauge
    From: "peterthomson" <peterlthomson@gmail.com>
    hi List I have a Jabiru J170C which has VDO 3 wire (+, - and sensor) gauges and sensors for oil temperature and oil pressure. As sensor resistance increases, gauge values increase. When I installed a Dynon D180. I ran a wire from the same gauge sensor wire to the Dynon. However, the values on the Dynon are not correct. Is there a work-around to be able to use both measuring instruments (VDO and Dynon) with same sensor ? thanks Peter Read this topic online here: http://forums.matronics.com/viewtopic.php?p=384982#384982


    Message 3


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    Time: 05:21:47 AM PST US
    Subject: Re: Using Dynon EMS together with VDO gauge
    From: "peterthomson" <peterlthomson@gmail.com>
    ooops .. as sensor resistance decrease on temp sensor, but increase on pressure sensor, gauge value increases.... I've now come across dual station sensors, which will support two gauges by two wires. Is there another way ? thanks Peter Read this topic online here: http://forums.matronics.com/viewtopic.php?p=384987#384987


    Message 4


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    Time: 07:53:00 AM PST US
    From: MLWynn@aol.com
    Subject: Re: Right Angle Fast-on
    Bob, I amazed as always. Thank you for this article. I think that's what I'm going to do with my installation. Regards, Michael Wynn RV 8 Finishing San Ramon, CA In a message dated 10/8/2012 9:34:12 P.M. Pacific Daylight Time, nuckolls.bob@aeroelectric.com writes: At 08:45 PM 10/8/2012, you wrote: Thank you all for your insights. I have scratched my head about this a bunch. I don't really have two inches from the baffle to coils. It is a little late to try to put them in a different spot. Too much re-engineering. Considering what Bob is saying about the discussion with Klaus, maybe I should terminate the coax an inch or two away and crimp or solder on a short piece of 18 gauge tefzel and us that to make the bend. Add a couple of supports and I should be okay. Does that seem reasonable? I wouldn't do that. All coax or all shielded. At the time I published this Shop Note _http://www.aeroelectric.com/articles/RG58/RG58.html_ (http://www.aeroelectric.com/articles/RG58/RG58.html) several folks had already replaced RG-58 (suffering from temperature effects under the cowl) with Tefzel shielded wire and were satisfied with the results. I can't speak to the value of sparks jumping 1.5" gaps between coil towers but if that's a performance benchmark, be aware that shielded wire substitution may pollute that particular test result. Bob . . . (http://www.matronics.com/Navigator?AeroElectric-List) (http://www.matronics.com/contribution)


    Message 5


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    Time: 07:55:16 AM PST US
    From: MLWynn@aol.com
    Subject: Re: Right Angle Fast-on
    For the baffle to coil distance, I will have to go measure but I think about two inches, perhaps an inch and a half. I am not concerned about it shorting out, but couldn't see how I could get the coax to coil up in the space present. Thanks, Michael Wynn In a message dated 10/8/2012 9:34:41 P.M. Pacific Daylight Time, nuckolls.bob@aeroelectric.com writes: Hmmm. . . I overlooked the obvious question: How much room DO you have between coil and baffle? At 08:45 PM 10/8/2012, you wrote: Thank you all for your insights. I have scratched my head about this a bunch. I don't really have two inches from the baffle to coils. It is a little late to try to put them in a different spot. Too much re-engineering. Considering what Bob is saying about the discussion with Klaus, maybe I should terminate the coax an inch or two away and crimp or solder on a short piece of 18 gauge tefzel and us that to make the bend. Add a couple of supports and I should be okay. Does that seem reasonable? I wouldn't do that. All coax or all shielded. At the time I published this Shop Note _http://www.aeroelectric.com/articles/RG58/RG58.html _ (http://www.aeroelectric.com/articles/RG58/RG58.html) several folks had already replaced RG-58 (suffering from temperature effects under the cowl) with Tefzel shielded wire and were satisfied with the results. I can't speak to the value of sparks jumping 1.5" gaps between coil towers but if that's a performance benchmark, be aware that shielded wire substitution may pollute that particular test result. Bob . . . (http://www.matronics.com/Navigator?AeroElectric-List) (http://www.matronics.com/contribution)


    Message 6


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    Time: 09:34:57 AM PST US
    Subject: Re: Using Dynon EMS together with VDO gauge
    From: Paul Kuntz <paul.r.kuntz@gmail.com>
    Check the Dynon user forum on their web site. If the answer is not already available there, you can post your question and expect an answer within the hour from a Dynon tech Sent from my iPhone On Oct 9, 2012, at 5:19, "peterthomson" <peterlthomson@gmail.com> wrote: > > ooops .. as sensor resistance decrease on temp sensor, but increase on pressure sensor, gauge value increases.... > > I've now come across dual station sensors, which will support two gauges by two wires. Is there another way ? > > thanks > > Peter > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=384987#384987 > > > > > > > > > >


    Message 7


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    Time: 12:33:32 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Right Angle Fast-on
    At 09:54 AM 10/9/2012, you wrote: >For the baffle to coil distance, I will have to go measure but I >think about two inches, perhaps an inch and a half. I am not >concerned about it shorting out, but couldn't see how I could get >the coax to coil up in the space present. . . . not the coax . . . but connections to the coax. Try this: Emacs! Take your coax stripper and prepare a end as if you were going to install a crimp connector. Except you crimp a fast-on to the center conductor. Then fold the shields back over the outer jacket and solder a 20AWG pigtail to the shield. Put a nice string tie on the pigtail for insulation insulation support and install another fast-on. See if you can't install this termination in the space you described. As you can see here, the COAX can come STRAIGHT up to the terminals without bending. Only the more compliant conductors need be shaped to the task. Bob . . .


    Message 8


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    Time: 05:21:45 PM PST US
    Subject: Another grounding question
    From: "tomcostanza" <Tom@CostanzaAndAssociates.com>
    Hi All, So, with 3 ground connections (battery, fuselage, engine), which of the following permutations would be best? 1) Battery to fuselage, fuselage to engine 2) Battery to engine, fuselage to engine 3) Battery to fuselage, battery to engine The prime directives are to keep something on the engine from finding an unintended ground path in the event of a grounding failure, and keep the plane flying/communicating/navigating. -------- Clear Skies, Tom Costanza Read this topic online here: http://forums.matronics.com/viewtopic.php?p=385017#385017


    Message 9


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    Time: 06:39:29 PM PST US
    From: Charlie England <ceengland7@gmail.com>
    Subject: Slobovia Pumpkin Drop 2012 invitation
    Y'all come!


    Message 10


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    Time: 06:56:04 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Another grounding question
    At 07:20 PM 10/9/2012, you wrote: ><Tom@CostanzaAndAssociates.com> > >Hi All, > >So, with 3 ground connections (battery, fuselage, engine), which of >the following permutations would be best? > >1) Battery to fuselage, fuselage to engine >2) Battery to engine, fuselage to engine >3) Battery to fuselage, battery to engine > >The prime directives are to keep something on the engine from >finding an unintended ground path in the event of a grounding >failure, and keep the plane flying/communicating/navigating. See View -A- of http://tinyurl.com/6m3bk8k Bob . . .




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