AeroElectric-List Digest Archive

Sat 01/20/07


Total Messages Posted: 6



Today's Message Index:
----------------------
 
     1. 01:36 AM - Re: Ignition noise in Jabiru engine. (jetboy)
     2. 10:35 AM - Re: Re: Ignition noise in Jabiru engine. (N81JG@aol.com)
     3. 10:54 AM - Re: Re: Ignition noise in Jabiru engine. (N81JG@aol.com)
     4. 11:53 AM - Re: Re: Ignition noise in Jabiru engine. (Paul Kuntz)
     5. 12:00 PM - Jack plug question (Miskelly, Francis G)
     6. 02:02 PM - Tachometer Adapter (Eric M. Jones)
 
 
 


Message 1


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    Time: 01:36:47 AM PST US
    Subject: Re: Ignition noise in Jabiru engine.
    From: "jetboy" <sanson.r@xtra.co.nz>
    You might like to check the thread at Yahoo http://groups.yahoo.com/group/jabiruengines/message/16777 we have been testing inductive suppression HT leads and I have posted the radiated noise plots from the various types of HT leads in the files section. Ralph -------- Ralph - CH701 / 2200a Read this topic online here: http://forums.matronics.com/viewtopic.php?p=89049#89049


    Message 2


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    Time: 10:35:10 AM PST US
    From: N81JG@aol.com
    Subject: Re: Ignition noise in Jabiru engine.
    I have had an ignition noise problem in my VariEze composite (very susceptible since no metal frame to shield RF noise) plane since installing a CD ignition form Lightspeed Engineering in place of one of the mags. I tried the aluminum foil over the coil to plug leads grounded to the hex at the plugs with no effect. After consultation with Klaus Savier at Lightspeed I removed the foil and tightened the plug and coil clips and cleaned the contact surfaces. That made a big improvement with my radio reception coming through with only slight background plug firing noise. I am waiting for Klaus to ship a set of plug leads with better wire and clips that should be even better. Seems that any slight loose connection creates RF interference when the very high voltage (40,000 volts plus) jumps the connection. I will make sure the connections are tight and use a thin coat of dielectric grease (available at auto parts stores as a Permatex product) on the connections. Hope this will solve the problem. Be sure and check all your high voltage connections. Good luck. I will report back if my changes work. John Greaves Redding, CA VariEze N81JG


    Message 3


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    Time: 10:54:51 AM PST US
    From: N81JG@aol.com
    Subject: Re: Ignition noise in Jabiru engine.
    Hi all, I forgot to mention that my VariEze has an O235 Lycoming with the CD ignition and one mag. Didn't mean to confuse with the Jabiru, but ignition noise is similar source from HT plug or coil leads. John Greaves


    Message 4


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    Time: 11:53:51 AM PST US
    Subject: Re: Ignition noise in Jabiru engine.
    From: Paul Kuntz <paul.r.kuntz@gmail.com>
    Regarding dielectric grease -- the dielectric adjective denotes the fact that the grease does NOT conduct electricity. Its use for electric connections is to lubricate (which helps ensure that screw connections and sliding connections mate completely and achieve the full metal-to-metal contact desired), then after being displaced by the connecting process the grease keeps oxygen away and helps prevent corrosion that can eventually break down the connection. The dielectric (non-conducting) property also prevents the grease from forming a conductive pathway to adjacent circuits. This isn't to say you shouldn't use it, particularly if Klaus recommends it. I'm not an expert on high-voltage applications, and Klaus has a lot of practical experience. Just trying to clarify and improve the underlying knowledge base. Regards, Paul Kuntz Cozy MKIV and Pipistrel Sinus 912 motorglider http://www.pipistrelbuilders.com/ ----- Original Message ----- From: N81JG@aol.com To: aeroelectric-list@matronics.com Sent: Saturday, January 20, 2007 10:33 AM Subject: Re: AeroElectric-List: Re: Ignition noise in Jabiru engine. I have had an ignition noise problem in my VariEze composite (very susceptible since no metal frame to shield RF noise) plane since installing a CD ignition form Lightspeed Engineering in place of one of the mags. I tried the aluminum foil over the coil to plug leads grounded to the hex at the plugs with no effect. After consultation with Klaus Savier at Lightspeed I removed the foil and tightened the plug and coil clips and cleaned the contact surfaces. That made a big improvement with my radio reception coming through with only slight background plug firing noise. I am waiting for Klaus to ship a set of plug leads with better wire and clips that should be even better. Seems that any slight loose connection creates RF interference when the very high voltage (40,000 volts plus) jumps the connection. I will make sure the connections are tight and use a thin coat of dielectric grease (available at auto parts stores as a Permatex product) on the connections. Hope this will solve the problem. Be sure and check all your high voltage connections. Good luck. I will report back if my changes work. John Greaves Redding, CA VariEze N81JG


    Message 5


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    Time: 12:00:12 PM PST US
    Subject: Jack plug question
    From: "Miskelly, Francis G" <f.miskelly@imperial.ac.uk>
    I have a King 155 in a Glastar - fibreglass panel To hear other stations i have the radio turned up full and there's lots of radio interference. When i pull out the Jack plug the volume increases substantially (maybe 30%) and i have to turn down the volume. The radio interference is much less. When i push the jack plug back in the volume diminishes and the static noise reappears Can someone explain this? Many thanks Frank


    Message 6


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    Time: 02:02:21 PM PST US
    Subject: Tachometer Adapter
    From: "Eric M. Jones" <emjones@charter.net>
    For one of my loyal and wise customers, I designed a built a device to adapt a three-pulse-per-rev output to a 1.5 pulse per rev RPM display. I am totally ignorant of what demand there is for such a device. If you are interested I will either make these or sell kits or release the design in the common good. O'scope shot attached. You can always trust the information given to you by people who are crazy; they have an access to truth not available through regular channels. -- Sheila Ballantyne -------- Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge, MA 01550 (508) 764-2072 emjones@charter.net Read this topic online here: http://forums.matronics.com/viewtopic.php?p=89144#89144 Attachments: http://forums.matronics.com//files/tacho_divider_158.jpg




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