Today's Message Index:
----------------------
1. 01:51 AM - Re: Jack plug question (Miskelly, Francis G)
2. 05:09 AM - Re: Timer module (Greg Campbell)
3. 05:23 AM - Re: Timer module (Matt Jurotich)
4. 06:09 AM - Re: Starting Points (corrected as promised) (Robert L. Nuckolls, III)
5. 06:13 AM - Re: Re: Jack plug question (Robert L. Nuckolls, III)
6. 06:36 AM - Re: Timer module (Robert L. Nuckolls, III)
7. 07:12 AM - Re: Re: Jack plug question (Miskelly, Francis G)
8. 01:08 PM - bump (Bill Boyd)
9. 01:14 PM - OT Question for Bob (pilot4pay)
10. 02:26 PM - jabiru coil grounds (bob noffs)
11. 04:19 PM - Re: jabiru coil grounds (Robert L. Nuckolls, III)
12. 04:19 PM - Re: OT Question for Bob (Robert L. Nuckolls, III)
13. 06:50 PM - a couple of specific wiring questions (Bill Boyd)
Message 1
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Subject: | RE: Jack plug question |
Re-posting question more accurately
I have a King KX155 in a Glastar - composite aircraft with 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 microphone jack plug (leaving
the headphone jack in) the volume increases substantially (maybe 30%)
and i have to turn down the volume. The radio interference is much less.
When i push the microphone jack plug back in the volume diminishes and
the static noise reappears
Can someone explain this?
Many thanks
Frank
Message 2
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Subject: | Re: Timer module |
I went to Home Depot and got a wind up timer switch for $9.
It weighs 4.1 oz and is rated for 20A @ 125 Vac or a 1HP motor.
They sell a 0-60 minute version and a 0-12 hour version.
It's a little bulky behind the panel, but the knob on the front is small,
sturdy,
and intuitive. You wind it up and you've got lights for 0 to 60 minutes.
It even has an audible reminder that the courtesy lights are on!
(It goes "ticka-ticka-ticka" ;-)
I found a piece of "nearly useless" panel space near the upper left of my
panel
that had very little room behind it and was otherwise hard to get to -
but it's perfect for the timer. It's easy to reach immediately after
opening
the door at night to start a preflight. It also makes a decent backup light
& timer.
I like the high tech stuff too, but this low tech "turn past 10" gizmo
filled the bill nicely for under $10.
Greg
Message 3
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Subject: | Re: Timer module |
Bob
Could you put the schematic and a parts list for the on-limit timer
in a more readable format. I am having difficulty reading some of
the parts and have to make assumptions such as the left most caps are
0.1 mircrofarrads and and V1A is same part as V1B and V1C and there
is a floating symbol that does not make sense to me.
Thanks
Matthew M. Jurotich
e-mail mail to: <mjurotich@hst.nasa.gov>
phone : 301-286-5919
Message 4
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Subject: | Re: Starting Points (corrected as promised) |
Thanks for the heads up. Fixed this and some other link problems.
The fixed version has been posted.
Bob . . .
At 09:47 PM 1/21/2007 -0600, you wrote:
><Earl_Schroeder@juno.com>
>
>Hmmm, updated in 2008? I didn't think I slept THAT long... :-D Earl
Message 5
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Subject: | Re: RE: Jack plug question |
At 09:44 AM 1/22/2007 +0000, you wrote:
>Re-posting question more accurately
>I have a King KX155 in a Glastar - composite aircraft with 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 microphone jack plug (leaving the
>headphone jack in) the volume increases substantially (maybe 30%) and i
>have to turn down the volume. The radio interference is much less. When i
>push the microphone jack plug back in the volume diminishes and the static
>noise reappears
>
>Can someone explain this?
I'm at a loss to deduce something I could purposely
do to create the problem you describe. Obviously, there
either a wiring problem or some form of failure in the
equipment . . . but I'd have to put my hands on it and
do some investigative experiments to sort this one out.
Has it always done this or is the condition new?
Bob . . .
Message 6
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Subject: | Re: Timer module |
At 08:21 AM 1/22/2007 -0500, you wrote:
><mjurotich@hst.nasa.gov>
>
>Bob
>
>Could you put the schematic and a parts list for the on-limit timer in a
>more readable format. I am having difficulty reading some of the parts
>and have to make assumptions such as the left most caps are 0.1
>mircrofarrads and and V1A is same part as V1B and V1C and there is a
>floating symbol that does not make sense to me.
Look up the CD4093 integrated circuit. It has 4 sections
of which only three are used and the forth is "tied off".
The caps are either 0.1 uF and 10 uF except the
timing cap which may be 10 to 47 uF set by experiment
to achieve desired time delay.
The resistors are 1K, 100 ohms, 470 ohms, and 100K
except for the time-adjust resistor which you'll
have to experiment with to achieve the desired
time delay.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
Message 7
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Subject: | RE: Jack plug question |
Thanks Bob.
The KX155 is 6 months old. This problem has been there from the
beginning. It came with harness pre-wired and i installed it. Sometimes
i use a handheld (ICOM A20) wired into the a/c power supply and aerial
and there's some ignition noise but not a serious problem. Its just the
panel mounted KX155. The microphone jack interferes with the volume
(even with the squelch turned off) and introduces interference
Two possibles i thought of were
1. The microphone socket may need an earth? The panel is fibreglass and
the socket has 2 wires running into it but is not earthed to the
airframe
2. Could the wires in the microphone socket be transposed?
As the ICOM works OK that seems to exclude power supply or aerial
issues?
Very grateful for your advice.
Frank
________________________________
From: owner-aeroelectric-list-server@matronics.com on behalf of Robert
L. Nuckolls, III
Sent: Mon 22/01/2007 14:13
Subject: Re: AeroElectric-List: RE: Jack plug question
<nuckollsr@cox.net>
At 09:44 AM 1/22/2007 +0000, you wrote:
>Re-posting question more accurately
>I have a King KX155 in a Glastar - composite aircraft with 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 microphone jack plug (leaving
the
>headphone jack in) the volume increases substantially (maybe 30%) and i
>have to turn down the volume. The radio interference is much less. When
i
>push the microphone jack plug back in the volume diminishes and the
static
>noise reappears
>
>Can someone explain this?
I'm at a loss to deduce something I could purposely
do to create the problem you describe. Obviously, there
either a wiring problem or some form of failure in the
equipment . . . but I'd have to put my hands on it and
do some investigative experiments to sort this one out.
Has it always done this or is the condition new?
Bob . . .
Message 8
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Forgive my impatience, Bob; I'd like to bump to the top of the pile
two recent inquiries I submitted over the weekend. I am ready to pull
wire on these systems tonight, but I'd like to hear your thoughts on
the inrush current limiter idea and the wiring gauge/protection for
the SD-8 battery lead. Waiting to hear something before I head to the
shop :-)
-Bill B
Message 9
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Subject: | OT Question for Bob |
I noticed that you mention you taught at Great Lakes. I took "Beep" and FT "A"
there in '79. Any chance we crossed paths? Were you civie or service? I remember
the "Nukes Clock" in the "Beep" admin office that ran backwards real fast,
any chance you had somethng to do with that? Always gave me a chuckle. [Laughing]
Craig Smith
Do not archive
--------
Craig Smith
Future CH640 builder
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=89587#89587
Message 10
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Subject: | jabiru coil grounds |
hi bob,
i asked this question a week ago but got no response so i will try
again. this refers to the z-20 wiring diagram for a jab engine and
''note #3''
i understand a shielded wire connects the coil to the ignition switch
and when the switch is turned ''off'' the coil is grounded . i am using
a keyed switch like is used in a piper.
i see that the shielding is grounded at the engine.
here comes the question.......... it seems that the opposite end of
the shielding is attached to the ''ground'' terminal of my switch. so
the switch receives it's ground thru the shielding . am i correct? the
switch does not need a wire from the ''forest of tabs'' ground because
it is using the shielding for ground. correct?
if i am correct in these observations my last question is ''why is
this done like this? why not use another wire to ground the switch and
leave the ''switch end'' of the shielding unattached?
i appreciate your patience. this elect. stuff is hard enough for me
when i DO understand the reasons.
bob noffs
Message 11
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Subject: | Re: jabiru coil grounds |
At 04:23 PM 1/22/2007 -0600, you wrote:
>hi bob,
> i asked this question a week ago but got no response so i will try
> again. this refers to the z-20 wiring diagram for a jab engine and ''note #3''
> i understand a shielded wire connects the coil to the ignition switch
> and when the switch is turned ''off'' the coil is grounded . i am using a
> keyed switch like is used in a piper.
> i see that the shielding is grounded at the engine.
> here comes the question.......... it seems that the opposite end of the
> shielding is attached to the ''ground'' terminal of my switch. so the
> switch receives it's ground thru the shielding . am i correct? the
> switch does not need a wire from the ''forest of tabs'' ground because it
> is using the shielding for ground. correct?
Yes
>
> if i am correct in these observations my last question is ''why is
> this done like this? why not use another wire to ground the switch and
> leave the ''switch end'' of the shielding unattached?
> i appreciate your patience. this elect. stuff is hard enough for me
> when i DO understand the reasons.
You don't want MULTIPLE ground conductors bringing the crankcase
to the airframe. Grounding the shielding of p-leads at both ends
does just that.
Multiple ground paths are the root cause of ground-loop induced noises
and in this case offers the potential for damaging a p-lead conductor
and other wires bundled with it should (1) the bond strap between crankcase
and firewall stud become disconnected and (2) an attempt is made to
start the engine. Had a mechanic do it twice on me . . . didn't offer
him a third opportunity.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
Message 12
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Subject: | Re: OT Question for Bob |
At 01:11 PM 1/22/2007 -0800, you wrote:
><pilot4profit@sbcglobal.net>
>
>I noticed that you mention you taught at Great Lakes. I took "Beep" and FT
>"A" there in '79. Any chance we crossed paths? Were you civie or service?
>I remember the "Nukes Clock" in the "Beep" admin office that ran backwards
>real fast, any chance you had somethng to do with that? Always gave me a
>chuckle. [Laughing]
>
>Craig Smith
I taught in the last 8-weeks of a 26 week course
which I believe was "ET-C" school. I was a contract
instructor for H.L. Yoh Company through the spring
and summer of '64 so I guess that was a tad before
your tenure there.
Bob . . .
Message 13
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Subject: | a couple of specific wiring questions |
First, I want to make sure I'm okay using a D-sub connector to carry
flap motor loads in an RV. I think 16 AWG is recommended for the
motor wiring; will a single D-sub pin carry the current, or should I
double-up on pins?
Second, there is a wide range of recommendations and practice
regarding the B-lead wiring for the SD-8 alternator. The Z 13/8
diagram shows 12 AWG for this run; the documents from B&C show 14 AWG,
yet the wire they supply (potted into the regulator) is 16 AWG.
Given that these critters can only do about 10A flat-out, are we
sizing for voltage drop concerns here? It's not just academic: I can
fuselink-protect a 16 AWG wire, maybe even a 14 AAWG one, but above
that it means buying ANL's. Besides, there's the 2-gram weight
difference to obsess over ;-)
-Bill B
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