Today's Message Index:
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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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Subject: | Re: Ignition noise in Jabiru engine. |
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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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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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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Subject: | Re: Ignition noise in Jabiru engine. |
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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Subject: | Jack plug question |
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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Subject: | Tachometer Adapter |
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
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