Today's Message Index:
----------------------
1. 01:54 AM - Re: Compass Requirements in Experimental Aircraft (updated) (Chuck Jensen)
2. 04:49 AM - Re: Panel Labeling (Todd Heffley)
3. 04:51 AM - handheld radio into intercom (The Minearts)
4. 05:23 AM - Re: switch rating question (Richard T. Schaefer)
5. 05:26 AM - Re: sizing wire (Richard T. Schaefer)
6. 05:57 AM - Re: EXP-Bus, SUBARU wiring (Robert L. Nuckolls, III)
7. 06:06 AM - FW: Tap into antenna coax? (Jeffrey W. Skiba)
8. 06:42 AM - Re: Engine GND (Frank Stringham)
9. 06:48 AM - Re: DMC Daniels AFM8 - Positioner (Todd Heffley)
10. 09:12 AM - Re: switch rating question (Richard T. Schaefer)
11. 11:06 AM - Re: switch rating question ()
12. 11:42 AM - Re: switch rating question (B Tomm)
13. 12:19 PM - Re: switch rating question (Robert L. Nuckolls, III)
14. 12:21 PM - Re: switch rating question (Richard T. Schaefer)
15. 12:41 PM - Re: FW: Tap into antenna coax? (Robert L. Nuckolls, III)
16. 12:42 PM - Re: Help with D-Sub pin (Robert L. Nuckolls, III)
17. 01:48 PM - Re: handheld radio into intercom (Peter Pengilly)
18. 02:09 PM - Re: Help with D-Sub pin (H. M. Haught Jr.)
19. 02:12 PM - King Hand-held Wiring Diagram or Advice (H. M. Haught Jr.)
20. 06:38 PM - Re: Panel Labeling (AlRice)
21. 10:49 PM - Re: switch rating question (mike humphrey)
Message 1
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Subject: | Compass Requirements in Experimental Aircraft |
(updated)
Jim, the absence of heading information for ATC makes sense. Approaching Knoxville,
TN (TYS), they'll often give me a heading that I'm already on. If they can't
predict my track, at least if they give me a heading they know where I'm
supposed to be going...helps keep paint transfers to a minimum. ATC's equipment
is so "60s.....".
Chuck Jensen
Now, from a previous life as an air traffic controller...tower and
radar/RAPCON/GCA......
We almost never knew what your heading was and mostly didn't
care unless it was vectors to an ASR approach or, possibly, a
PAR, or alternatively, an initial heading to fly on a departure or
vectors to final. Usually we just gave you a heading and
generally were in the ballpark. Other than that it was all relative
motion in relation to the any other aircraft's track. I think the
newer ARTS Radar track/tag systems have quick call-up
heading and predictive course extension....or perhaps that was
just something I'd read from a NASA paper. Anyway, during my
time, the only way to know what your heading was is to have
asked for it.
Jim Baker
580.788.2779
Elmore City, OK
Message 2
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Subject: | Re: Panel Labeling |
I use "Datak" dry transfers.
http://www.oselectronics.com/ose_p52.htm shows an example
This is a very frustrating project if the panel is mounted in the airplane.
Not too bad if it is on the bench.
Matte Datakote over the entire panel.
This produces a product just as nice as silk screen. Costs little.
Star with a sample panel, test your process and the chemicals first.
Good Luck
todd
Message 3
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Subject: | handheld radio into intercom |
Am I being too simple-minded to think I could connect a handheld transceiver
into an intercom (have a Flightcom 403mc) via the headset adaptor jacks?
Steve Mineart, CH601, awaiting inspection.
Do Not archive
Message 4
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Subject: | switch rating question |
Each is 15A. But you should NOT run them in parallel to get 30A.
Each switch will close (ARC) at a different time (milli seconds) and you
will get a larger load on one or the other instantaneously. (It's actually
the switch closing and opening that limits the current range!)
Using them to control two circuits in parallel is fine!
r.t.s.
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of B Tomm
Sent: Friday, January 04, 2008 12:56 AM
Subject: AeroElectric-List: switch rating question
If a given double pole switch is rated at 15 amps, is that to mean total,
7.5 amps per pole, 15 amps one pole zero for the other, 15 amps each pole
2X15=30? I'm thinking about a double pole switch for two 100 watt landing
lights (one per wing tip). Can I use one switch, 2 poles 2 fuses?
Bevan
RV7A wiring
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Lincoln
Keill
Sent: Thursday, January 03, 2008 10:18 PM
Subject: AeroElectric-List: sizing wire
I'm almost through "The Aero-Electric Connection" and haven't been able to
find the "Six-Step Guide to Sizing Wire" so could someone back me up on my
methodology before I go off and size every wire of my wiring diagram
incorrectly?
As an example: I will have a 75W landing light in each wingtip controlled
with one switch with a wire run length for each light of 15 feet (including
the ground wire from each lamp to the spar). Worst case (alternator out
with a 12V battery), each lamp will draw 6.25A so initially you'd think 20
AWG wire would suffice (7A max) but since we want to keep the voltage drop
below 0.5V we need to use 16 AWG wire (15 foot resistance of .06 ohms times
6.25A is .38V which is less than 0.50V drop). Since my 16 AWG wire can
handle 12.5A, I could safely use a 10A fuse for each light and not worry
about the wire burning up or a premature trip when first turning on the
lights. Alternatively, I could use 14 AWG wire (15A max) and a single 15A
fuse for both lights. The switch should be either a 2-2 (16AWG scenario) or
a 1-2 (14AWG scenario) rated for 15A.
Whew! Have I got all that correct? As B&J once said: "Thanks for Your
Support!"
Lincoln Keill
Sacramento, CA
RV-7A
P.S. Can anyone recommend one supplier to get all the goodies for a Z-11
system (wire, switches, fuse blocks, starter & battery contactors, fuse
links, shunts, silicon diode array, ground bus blocks,crowbar overvoltage
protection, low voltage module, etc. etc.)?
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matro
nics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
Message 5
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You are likely to replace hot high current lamps with cool, low current LED
lamps in the future.
That technology is moving quite fast and the inverse price/intensity ratio
is getting better all the time.
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of B Tomm
Sent: Friday, January 04, 2008 12:53 AM
Subject: RE: AeroElectric-List: sizing wire
LK,
You could probably source all that stuff at http://www.bandc.biz/ Click on
the yellow link "products".
I'm looking at the wiring chart sample that comes with my preview plans. It
indicates 14 awg would be the size to go with. This will also allow you to
fit 100watt bulbs in the future. Separately fused at 10 amps.
Just my .02 cents worth. I'm sure the experts will chime in, in the
morning.
Bevan
Rv7A wiring
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Lincoln
Keill
Sent: Thursday, January 03, 2008 10:18 PM
Subject: AeroElectric-List: sizing wire
I'm almost through "The Aero-Electric Connection" and haven't been able to
find the "Six-Step Guide to Sizing Wire" so could someone back me up on my
methodology before I go off and size every wire of my wiring diagram
incorrectly?
As an example: I will have a 75W landing light in each wingtip controlled
with one switch with a wire run length for each light of 15 feet (including
the ground wire from each lamp to the spar). Worst case (alternator out
with a 12V battery), each lamp will draw 6.25A so initially you'd think 20
AWG wire would suffice (7A max) but since we want to keep the voltage drop
below 0.5V we need to use 16 AWG wire (15 foot resistance of .06 ohms times
6.25A is .38V which is less than 0.50V drop). Since my 16 AWG wire can
handle 12.5A, I could safely use a 10A fuse for each light and not worry
about the wire burning up or a premature trip when first turning on the
lights. Alternatively, I could use 14 AWG wire (15A max) and a single 15A
fuse for both lights. The switch should be either a 2-2 (16AWG scenario) or
a 1-2 (14AWG scenario) rated for 15A.
Whew! Have I got all that correct? As B&J once said: "Thanks for Your
Support!"
Lincoln Keill
Sacramento, CA
RV-7A
P.S. Can anyone recommend one supplier to get all the goodies for a Z-11
system (wire, switches, fuse blocks, starter & battery contactors, fuse
links, shunts, silicon diode array, ground bus blocks,crowbar overvoltage
protection, low voltage module, etc. etc.)?
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matro
nics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
Message 6
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Subject: | Re: EXP-Bus, SUBARU wiring |
At 04:34 PM 1/3/2008 -0500, you wrote:
>
>Robert L. Nuckolls, III wrote:
> > Misunderstandings
> > aside, I thought that Eggenfellner had already
> > published suggested system architecture drawings
> > that utilized the EXP-Bus.
>
>Hi Bob,
> Eggenfellner is no longer recommending the use of the EXP-bus for
>their installations.
>
> >
> > Did you have any specific questions about
> > Eggenfellner's proposed installation for which
> > I or another List reader can be helpful?
> >
>
> I (and I think a lot of others) are hoping to see a recommended
>architecture from you that addresses the needs of the Eggenfellner
>engine package, likely resembling some variant of Z-19 with the rear
>dual batteries (Z-19/RB I think you called it).
And that's the drawing I'm working on as noted last
week sometime . . .
Bob. . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 7
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Subject: | Tap into antenna coax? |
Reposting since I am still unable to find the link in question. Aka the
commtap
http://aeroelectric.com/articles/commtap/commtap.html
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Jeffrey
W. Skiba
Sent: Sunday, December 30, 2007 4:39 PM
Subject: RE: AeroElectric-List: Tap into antenna coax?
<jskiba@icosa.net>
I realize this is an old post but the link below:
http://aeroelectric.com/articles/commtap/commtap.html
returns a page not found, I tried looking manually for the info but seem to
not be able to find it.
Can anyone advise ?
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Sunday, March 20, 2005 5:15 PM
Subject: Re: AeroElectric-List: Tap into antenna coax?
<b.nuckolls@cox.net>
Don't know how long Jim's had his butt-ugly hand held antenna adapter
article posted. My own version is at:
http://aeroelectric.com/articles/commtap/commtap.html
HOWEVER, the top paragraph of my article cites the preferred way
of breaking into the feedline for your comm antenna . . . put a
male/female junction in the feedline with some excess coiled under
a seat or behind a velcro'ed upholstery panel. The coax "T" will not
work and puts one or both radio's receivers at risk for damage by
the other radio's transmitter.
Bob . . .
At 10:16 AM 3/20/2005 -0600, you wrote:
><ceengland@bellsouth.net>
>
>James E. Clark wrote:
>
> <james@nextupventures.com>
> >
> >Another option ...
> >
> >King used to make an adapter for their KX99 Handheld that can be used.
> >Basically the mini jack/plug arrangement opens the coax from the panel
and
> >closes the connection to the handheld. It is all done in a neat little
box
> >and you get a mini->coax pigtail.
> >
> >Don't know if they still sell them or not.
> >
> >James
> >
>
>snipped
>
>You can make one of these for yourself if you're handy with a soldering
>iron. Jim Weir actually described construction in an old Kitplanes article.
>http://www.rst-engr.com/kitplanes/KP0203/KP0203.htm
>The design won't make HAM radio guys or RF engineer types happy, but it
>works fine considering the limited use it will get. If you're really
>worried, put it in a little aluminum box.
>
>Charlie
>
>
Message 8
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Subject: | ectric-List:Engine GND |
Frank1
Hey whats up or is that down...good grief with your acro ability I never kn
ow what your attitude might be. Thanks for the response....now off to the g
arage to getter dun......................or is that accomplish the task!!!!
Frank2
From: frank.hinde@hp.comTo: aeroelectric-list@matronics.comDate: Thu, 3 Jan
2008 23:39:58 +0000Subject: RE: AeroElectric-List:Engine GND
Hey thats what I did and I made it from Corvallis to St George and back....
:)
Yup that will work just fine. Use #2 welding cable for the ultimate in flex
ibility.
Frank1
RV7a 245 hours
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectr
ic-list-server@matronics.com] On Behalf Of Frank StringhamSent: Thursday, J
anuary 03, 2008 3:02 PMTo: aeroelectric-list@matronics.comSubject: RE: Aero
Electric-List:Engine GND
Ok so here is the set up...RV7A.....SD-8 on the Vac pad....FWF Ground block
just right of upper center on the firewall. I have a clear run for the eng
ine GND from the port side upper bolt on the SD-8 to the FWF ground block.
Is this acceptable and will it produce a good engine GND. Fran @ SGU....RV7
A.....finishing up the last zillion items before RV grin Time
ist">http://www.matronics.com/Navigator?AeroElectric-List
ics.com
.matronics.com/contribution
Message 9
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Subject: | Re: DMC Daniels AFM8 - Positioner |
Paterick
You can position the pins by hand just fine.
Also, I have drilled and filed the wrong positioner to use Dsub pins.
Still use it today.
todd
Message 10
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Subject: | switch rating question |
You might also look to see if this is a "Resistive" load or an
"Incandescent" load or an "Inductive" load rating.
Resistive - Load presents a constant current.
Inductive - Load typically has voltage and current out of phase. (Something
with a winding, like a motor or contactor)
Incandescent - Load has a large startup current compared to normal running
current.
If not qualified it's probably resistive. Your Halogen bulbs present a
"Incandescent" load.
They draw a LOT of current when they start. They would be OK for your 75W
bulbs. You might be pushing it at 100W.
They failure will not be a Fuse, or a wire, but burnt (from an arc) contacts
that may fail to open or more likely to close.
r.t.s.
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Richard
T. Schaefer
Sent: Friday, January 04, 2008 7:23 AM
Subject: RE: AeroElectric-List: switch rating question
Each is 15A. But you should NOT run them in parallel to get 30A.
Each switch will close (ARC) at a different time (milli seconds) and you
will get a larger load on one or the other instantaneously. (It's actually
the switch closing and opening that limits the current range!)
Using them to control two circuits in parallel is fine!
r.t.s.
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of B Tomm
Sent: Friday, January 04, 2008 12:56 AM
Subject: AeroElectric-List: switch rating question
If a given double pole switch is rated at 15 amps, is that to mean total,
7.5 amps per pole, 15 amps one pole zero for the other, 15 amps each pole
2X15=30? I'm thinking about a double pole switch for two 100 watt landing
lights (one per wing tip). Can I use one switch, 2 poles 2 fuses?
Bevan
RV7A wiring
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Lincoln
Keill
Sent: Thursday, January 03, 2008 10:18 PM
Subject: AeroElectric-List: sizing wire
I'm almost through "The Aero-Electric Connection" and haven't been able to
find the "Six-Step Guide to Sizing Wire" so could someone back me up on my
methodology before I go off and size every wire of my wiring diagram
incorrectly?
As an example: I will have a 75W landing light in each wingtip controlled
with one switch with a wire run length for each light of 15 feet (including
the ground wire from each lamp to the spar). Worst case (alternator out
with a 12V battery), each lamp will draw 6.25A so initially you'd think 20
AWG wire would suffice (7A max) but since we want to keep the voltage drop
below 0.5V we need to use 16 AWG wire (15 foot resistance of .06 ohms times
6.25A is .38V which is less than 0.50V drop). Since my 16 AWG wire can
handle 12.5A, I could safely use a 10A fuse for each light and not worry
about the wire burning up or a premature trip when first turning on the
lights. Alternatively, I could use 14 AWG wire (15A max) and a single 15A
fuse for both lights. The switch should be either a 2-2 (16AWG scenario) or
a 1-2 (14AWG scenario) rated for 15A.
Whew! Have I got all that correct? As B&J once said: "Thanks for Your
Support!"
Lincoln Keill
Sacramento, CA
RV-7A
P.S. Can anyone recommend one supplier to get all the goodies for a Z-11
system (wire, switches, fuse blocks, starter & battery contactors, fuse
links, shunts, silicon diode array, ground bus blocks,crowbar overvoltage
protection, low voltage module, etc. etc.)?
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matro
nics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
http://www.matronics.com/contribution
Message 11
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|
Subject: | switch rating question |
Switch manufacturers "rate" switches with at least 10"s if not 100's of
thousands of operations in mind. (some even millions) There are few, if any,
switches in an experimental aircraft which will ever see more than hundreds
or maybe a few thousand operations in the lifetime of the aircraft. As Bob N
has stated many times on this list, your switches are much more likely to
fail from lack of use than they are to fail from exceeding their ratings.
Bob McC
>From: "Richard T. Schaefer" <schaefer@rts-services.com>
>To: <aeroelectric-list@matronics.com>
>Subject: RE: AeroElectric-List: switch rating question
>Date: Fri, 4 Jan 2008 11:03:12 -0600
>
>You might also look to see if this is a "Resistive" load or an
>"Incandescent" load or an "Inductive" load rating.
>
>
>Resistive - Load presents a constant current.
>
>Inductive - Load typically has voltage and current out of phase.
>(Something
>with a winding, like a motor or contactor)
>
>Incandescent - Load has a large startup current compared to normal running
>current.
>
>
>If not qualified it's probably resistive. Your Halogen bulbs present a
>"Incandescent" load.
>
>They draw a LOT of current when they start. They would be OK for your 75W
>bulbs. You might be pushing it at 100W.
>
>They failure will not be a Fuse, or a wire, but burnt (from an arc)
>contacts
>that may fail to open or more likely to close.
>
>
>r.t.s.
>
>
> _____
>
>From: owner-aeroelectric-list-server@matronics.com
>[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Richard
>T. Schaefer
>Sent: Friday, January 04, 2008 7:23 AM
>To: aeroelectric-list@matronics.com
>Subject: RE: AeroElectric-List: switch rating question
>
>
>Each is 15A. But you should NOT run them in parallel to get 30A.
>
>Each switch will close (ARC) at a different time (milli seconds) and you
>will get a larger load on one or the other instantaneously. (It's actually
>the switch closing and opening that limits the current range!)
>
>
>Using them to control two circuits in parallel is fine!
>
>
>r.t.s.
>
>
> _____
>
>From: owner-aeroelectric-list-server@matronics.com
>[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of B Tomm
>Sent: Friday, January 04, 2008 12:56 AM
>To: aeroelectric-list@matronics.com
>Subject: AeroElectric-List: switch rating question
>
>
>If a given double pole switch is rated at 15 amps, is that to mean total,
>7.5 amps per pole, 15 amps one pole zero for the other, 15 amps each pole
>2X15=30? I'm thinking about a double pole switch for two 100 watt landing
>lights (one per wing tip). Can I use one switch, 2 poles 2 fuses?
>
>
>Bevan
>
>RV7A wiring
>
>
> _____
>
>From: owner-aeroelectric-list-server@matronics.com
>[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Lincoln
>Keill
>Sent: Thursday, January 03, 2008 10:18 PM
>To: aeroelectric-list@matronics.com
>Subject: AeroElectric-List: sizing wire
>
>I'm almost through "The Aero-Electric Connection" and haven't been able to
>find the "Six-Step Guide to Sizing Wire" so could someone back me up on my
>methodology before I go off and size every wire of my wiring diagram
>incorrectly?
>
>
>As an example: I will have a 75W landing light in each wingtip controlled
>with one switch with a wire run length for each light of 15 feet (including
>the ground wire from each lamp to the spar). Worst case (alternator out
>with a 12V battery), each lamp will draw 6.25A so initially you'd think 20
>AWG wire would suffice (7A max) but since we want to keep the voltage drop
>below 0.5V we need to use 16 AWG wire (15 foot resistance of .06 ohms times
>6.25A is .38V which is less than 0.50V drop). Since my 16 AWG wire can
>handle 12.5A, I could safely use a 10A fuse for each light and not worry
>about the wire burning up or a premature trip when first turning on the
>lights. Alternatively, I could use 14 AWG wire (15A max) and a single 15A
>fuse for both lights. The switch should be either a 2-2 (16AWG scenario)
>or
>a 1-2 (14AWG scenario) rated for 15A.
>
>
>Whew! Have I got all that correct? As B&J once said: "Thanks for Your
>Support!"
>
>
>Lincoln Keill
>
>Sacramento, CA
>
>RV-7A
>
>
>P.S. Can anyone recommend one supplier to get all the goodies for a Z-11
>system (wire, switches, fuse blocks, starter & battery contactors, fuse
>links, shunts, silicon diode array, ground bus blocks,crowbar overvoltage
>protection, low voltage module, etc. etc.)?
>
>
>href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matro
>nics.com/Navigator?AeroElectric-List
>href="http://forums.matronics.com">http://forums.matronics.com
>href="http://www.matronics.com/contribution">http://www.matronics.com/c
>
>
>http://www.matronics.com/contribution
Message 12
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Subject: | switch rating question |
Yes, to clarify...
Can I use one double pole switch, rated at 15A, to turn on two 100 watt
halogen (Incandescent load) landing lights? The switch poles are not
considered to be in parallel because each is sending current to a different
location. Also, each circuit has it's own supply wire and fuse. Is this
correct?
Bevan
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Richard
T. Schaefer
Sent: Friday, January 04, 2008 9:03 AM
Subject: RE: AeroElectric-List: switch rating question
You might also look to see if this is a "Resistive" load or an
"Incandescent" load or an "Inductive" load rating.
Resistive - Load presents a constant current.
Inductive - Load typically has voltage and current out of phase. (Something
with a winding, like a motor or contactor)
Incandescent - Load has a large startup current compared to normal running
current.
If not qualified it's probably resistive. Your Halogen bulbs present a
"Incandescent" load.
They draw a LOT of current when they start. They would be OK for your 75W
bulbs. You might be pushing it at 100W.
They failure will not be a Fuse, or a wire, but burnt (from an arc) contacts
that may fail to open or more likely to close.
r.t.s.
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Richard
T. Schaefer
Sent: Friday, January 04, 2008 7:23 AM
Subject: RE: AeroElectric-List: switch rating question
Each is 15A. But you should NOT run them in parallel to get 30A.
Each switch will close (ARC) at a different time (milli seconds) and you
will get a larger load on one or the other instantaneously. (It's actually
the switch closing and opening that limits the current range!)
Using them to control two circuits in parallel is fine!
r.t.s.
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of B Tomm
Sent: Friday, January 04, 2008 12:56 AM
Subject: AeroElectric-List: switch rating question
If a given double pole switch is rated at 15 amps, is that to mean total,
7.5 amps per pole, 15 amps one pole zero for the other, 15 amps each pole
2X15=30? I'm thinking about a double pole switch for two 100 watt landing
lights (one per wing tip). Can I use one switch, 2 poles 2 fuses?
Bevan
RV7A wiring
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Lincoln
Keill
Sent: Thursday, January 03, 2008 10:18 PM
Subject: AeroElectric-List: sizing wire
I'm almost through "The Aero-Electric Connection" and haven't been able to
find the "Six-Step Guide to Sizing Wire" so could someone back me up on my
methodology before I go off and size every wire of my wiring diagram
incorrectly?
As an example: I will have a 75W landing light in each wingtip controlled
with one switch with a wire run length for each light of 15 feet (including
the ground wire from each lamp to the spar). Worst case (alternator out
with a 12V battery), each lamp will draw 6.25A so initially you'd think 20
AWG wire would suffice (7A max) but since we want to keep the voltage drop
below 0.5V we need to use 16 AWG wire (15 foot resistance of .06 ohms times
6.25A is .38V which is less than 0.50V drop). Since my 16 AWG wire can
handle 12.5A, I could safely use a 10A fuse for each light and not worry
about the wire burning up or a premature trip when first turning on the
lights. Alternatively, I could use 14 AWG wire (15A max) and a single 15A
fuse for both lights. The switch should be either a 2-2 (16AWG scenario) or
a 1-2 (14AWG scenario) rated for 15A.
Whew! Have I got all that correct? As B&J once said: "Thanks for Your
Support!"
Lincoln Keill
Sacramento, CA
RV-7A
P.S. Can anyone recommend one supplier to get all the goodies for a Z-11
system (wire, switches, fuse blocks, starter & battery contactors, fuse
links, shunts, silicon diode array, ground bus blocks,crowbar overvoltage
protection, low voltage module, etc. etc.)?
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matro
nics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
http://www.matronics.com/contribution
Message 13
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Subject: | switch rating question |
At 11:37 AM 1/4/2008 -0800, you wrote:
>"urn:schemas-microsoft-com:vml" xmlns:o =
>"urn:schemas-microsoft-com:office:office" xmlns:w =
>"urn:schemas-microsoft-com:office:word" xmlns:st1 =
>"urn:schemas-microsoft-com:office:smarttags">
>Yes, to clarify...
>
>Can I use one double pole switch, rated at 15A, to turn on two 100 watt
>halogen (Incandescent load) landing lights? The switch poles are not
>considered to be in parallel because each is sending current to a
>different location. Also, each circuit has it's own supply wire and
>fuse. Is this correct?
>
>Bevan
Correct. What you propose will be fine.
Bob . . .
Message 14
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Subject: | switch rating question |
Yes
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of B Tomm
Sent: Friday, January 04, 2008 1:38 PM
Subject: RE: AeroElectric-List: switch rating question
Yes, to clarify...
Can I use one double pole switch, rated at 15A, to turn on two 100 watt
halogen (Incandescent load) landing lights? The switch poles are not
considered to be in parallel because each is sending current to a different
location. Also, each circuit has it's own supply wire and fuse. Is this
correct?
Bevan
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Richard
T. Schaefer
Sent: Friday, January 04, 2008 9:03 AM
Subject: RE: AeroElectric-List: switch rating question
You might also look to see if this is a "Resistive" load or an
"Incandescent" load or an "Inductive" load rating.
Resistive - Load presents a constant current.
Inductive - Load typically has voltage and current out of phase. (Something
with a winding, like a motor or contactor)
Incandescent - Load has a large startup current compared to normal running
current.
If not qualified it's probably resistive. Your Halogen bulbs present a
"Incandescent" load.
They draw a LOT of current when they start. They would be OK for your 75W
bulbs. You might be pushing it at 100W.
They failure will not be a Fuse, or a wire, but burnt (from an arc) contacts
that may fail to open or more likely to close.
r.t.s.
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Richard
T. Schaefer
Sent: Friday, January 04, 2008 7:23 AM
Subject: RE: AeroElectric-List: switch rating question
Each is 15A. But you should NOT run them in parallel to get 30A.
Each switch will close (ARC) at a different time (milli seconds) and you
will get a larger load on one or the other instantaneously. (It's actually
the switch closing and opening that limits the current range!)
Using them to control two circuits in parallel is fine!
r.t.s.
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of B Tomm
Sent: Friday, January 04, 2008 12:56 AM
Subject: AeroElectric-List: switch rating question
If a given double pole switch is rated at 15 amps, is that to mean total,
7.5 amps per pole, 15 amps one pole zero for the other, 15 amps each pole
2X15=30? I'm thinking about a double pole switch for two 100 watt landing
lights (one per wing tip). Can I use one switch, 2 poles 2 fuses?
Bevan
RV7A wiring
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Lincoln
Keill
Sent: Thursday, January 03, 2008 10:18 PM
Subject: AeroElectric-List: sizing wire
I'm almost through "The Aero-Electric Connection" and haven't been able to
find the "Six-Step Guide to Sizing Wire" so could someone back me up on my
methodology before I go off and size every wire of my wiring diagram
incorrectly?
As an example: I will have a 75W landing light in each wingtip controlled
with one switch with a wire run length for each light of 15 feet (including
the ground wire from each lamp to the spar). Worst case (alternator out
with a 12V battery), each lamp will draw 6.25A so initially you'd think 20
AWG wire would suffice (7A max) but since we want to keep the voltage drop
below 0.5V we need to use 16 AWG wire (15 foot resistance of .06 ohms times
6.25A is .38V which is less than 0.50V drop). Since my 16 AWG wire can
handle 12.5A, I could safely use a 10A fuse for each light and not worry
about the wire burning up or a premature trip when first turning on the
lights. Alternatively, I could use 14 AWG wire (15A max) and a single 15A
fuse for both lights. The switch should be either a 2-2 (16AWG scenario) or
a 1-2 (14AWG scenario) rated for 15A.
Whew! Have I got all that correct? As B&J once said: "Thanks for Your
Support!"
Lincoln Keill
Sacramento, CA
RV-7A
P.S. Can anyone recommend one supplier to get all the goodies for a Z-11
system (wire, switches, fuse blocks, starter & battery contactors, fuse
links, shunts, silicon diode array, ground bus blocks,crowbar overvoltage
protection, low voltage module, etc. etc.)?
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matro
nics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
http://www.matronics.com/contribution
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matro
nics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
Message 15
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|
Subject: | Re: Tap into antenna coax? |
At 08:05 AM 1/4/2008 -0600, you wrote:
>
>Reposting since I am still unable to find the link in question. Aka the
>commtap
>
>http://aeroelectric.com/articles/commtap/commtap.html
This comic-book on crafting a panel
mounted jack to tap into the comm antenna
coax borrowed from this product by
ICOM:
http://www.aeroelectric.com/Pictures/Antenna/ICOM_HH_Adapter_2.jpg
http://www.aeroelectric.com/Pictures/Antenna/ICOM_HH_Adapter_2.jpg
Except that the version I proposed was much
more compact:
http://www.aeroelectric.com/Pictures/Antenna/CommTap-Jack.jpg
However, both designs relied on a miniature, close-
circuit phone jack similar to:
http://www.aeroelectric.com/Pictures/Connectors/Audio/3p5_mm_Jack.jpg
which mates with this plug:
http://www.aeroelectric.com/Pictures/Connectors/Audio/3p5_mm_Phone_Plug.jpg
The quality of the "closed circuit" switch labeled with
the "!" puts the panel mounted comm radio at risk. Switches
of this variety tend to get funky with age. They're "closed"
at any time the hand held radio is not plugged in such
that the comm radio is connected to the antenna. Corrosion
on these open, low pressure contacts can cause poor
connection to the antenna for the panel mounted radio.
Hence, my loss of enthusiasm for this approach to attaching
the hand held radio to ship's comm antenna. Until a better
idea comes along, consider looping some slack in the comm
antenna feedline through the cockpit and breaking it
with an in-line pair of connectors:
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Cable_Female_2.jpg
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Cable_Male.jpg
If you make this joint accessible in the cockpit,
then it's easy to open the connectors and route
the "slack" up to the hand-held's antenna jack.
Consider adding a couple of right-angle adapters
to the end of the antenna coax:
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Rt-Angle_Adapt_1.jpg
These can be used to make a tight u-turn for the
antenna feeder such that it will lay tightly against
the back of the radio. A rubber-band will keep it
snug against the radio. This gets around having
the coax make a wide loop above the radio and makes
it much easier to handle in the cockpit.
Bob . . .
Message 16
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|
Subject: | Re: Help with D-Sub pin |
At 09:37 PM 12/30/2007 -0500, you wrote:
><edchristian@knology.net>
>
>Also, anyone know standard order parts for 37 pin D-Sub pin male/ female
>and pins (both) - Mauser or DigiKey? This is to make Avionics
>ground bus.
http://Steinair.com
Dsub pins SA-1018. Get bag of 100.
sockets SA-1017, ditto
SA-1031 housing for sockets.
I couldn't find a housing for pins
but I find it difficult to believe
he doesn't have them too. If it
turns out he doesn't have stock,
drop me a note and I'll mail you
one. They're cheap.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 17
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Subject: | handheld radio into intercom |
Why not? A panel mounted transceiver effectively has the same inputs. I
hooked mine up to comm3 on my audio panel as a standby radio. I bought
the correct size plugs to go into the handheld, rather than using the
headset adapter.
Peter
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of The
Minearts
Sent: 04 January 2008 12:51
Subject: AeroElectric-List: handheld radio into intercom
<smineart@mahaska.org>
Am I being too simple-minded to think I could connect a handheld
transceiver
into an intercom (have a Flightcom 403mc) via the headset adaptor jacks?
Steve Mineart, CH601, awaiting inspection.
Do Not archive
Message 18
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Subject: | Re: Help with D-Sub pin |
|*My King KX99 handheld radio adapter for Headphone is messing up. I took
it to a radio shop and all the connections were resoldered, but it still
only works about half the time - I suspect several breaks in the wires.
A friend gave me his adapter that came from another type of radio. It
has the two plugs for the headset end but also has the push to talk
wired into the adapter (the King used a plug that inserts into one of
the headset plugs). The other end of the adapter has the correct small
mini plug for the "Phones" jack. However the other connector to the
radio was a screw on type. There are two wires in that cable, one
larger than the other, both with a center insulated wire and a
multistrand surrounding which I assume is shielding.
I know very little about wiring, as I am sure this message
demonstrates! My question is how do I wire the two wires to the
mid-sized miniplug to go to the KX 99? That mini-plug has a tip contact
area, a second contact are a little further back and the shaft contact
area which I assume is the ground.. The plug receptacle on the radio
is marked "MIC". A radio tech told me how to wire it, which I did, and
then he checked it for me saying I had it wired correctly. However,
when I plug it into the radio, it transmits all the time (push to talk
always on?).
Anyone have a wiring diagram for the KX99 and adapter or can give me an
idea on how to wire the mini-plug to the mic receptacle? I've searched
extensively on line and cannot find a KX99 wiring diagram.
M. Haught*|
Message 19
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Subject: | King Hand-held Wiring Diagram or Advice |
-------- Original Message --------
Subject: King KX99 Handheld Schematic or Advice
From: H. M. Haught Jr. <handainc@madisoncounty.net>
References: <5.1.0.14.2.20071231091722.05371040@pop.central.cox.net>
|*My King KX99 handheld radio adapter for Headphone is messing up. I took
it to a radio shop and all the connections were resoldered, but it still
only works about half the time - I suspect several breaks in the wires.
A friend gave me his adapter that came from another type of radio. It
has the two plugs for the headset end but also has the push to talk
wired into the adapter (the King used a plug that inserts into one of
the headset plugs). The other end of the adapter has the correct small
mini plug for the "Phones" jack. However the other connector to the
radio was a screw on type. There are two wires in that cable, one
larger than the other, both with a center insulated wire and a
multistrand surrounding which I assume is shielding.
I know very little about wiring, as I am sure this message
demonstrates! My question is how do I wire the two wires to the
mid-sized miniplug to go to the KX 99? That mini-plug has a tip contact
area, a second contact are a little further back and the shaft contact
area which I assume is the ground.. The plug receptacle on the radio
is marked "MIC". A radio tech told me how to wire it, which I did, and
then he checked it for me saying I had it wired correctly. However,
when I plug it into the radio, it transmits all the time (push to talk
always on?).
Anyone have a wiring diagram for the KX99 and adapter or can give me an
idea on how to wire the mini-plug to the mic receptacle? I've searched
extensively on line and cannot find a KX99 wiring diagram.
M. Haught*|
Message 20
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Subject: | Re: Panel Labeling |
Check out Aircraft Engravers at www.engravers.net.
--------
Al Rice
Skybolt 260
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=156060#156060
Message 21
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Subject: | Re: switch rating question |
Bob,
Just a general question for you about the correct gauge wire to use on
lights, ie taxi/landing. Math/index chart states 14awg for 100w halogen,
but Van's lights, Duckwork is the brand I think, states in their
instructions 18awg for 55w or 16awg for 100w halogens. Since Van's sells
them for their planes, why the difference in suggested awg? Is this simply
a difference in a perfect world theory' or 'what works in the real world'?
Your input would be appreciated.
Thanks,
Mike H 9A/8A
----- Original Message -----
From: "Robert L. Nuckolls, III" <nuckolls.bob@cox.net>
Sent: Friday, January 04, 2008 3:11 PM
Subject: RE: AeroElectric-List: switch rating question
> <nuckolls.bob@cox.net>
>
> At 11:37 AM 1/4/2008 -0800, you wrote:
>
>>"urn:schemas-microsoft-com:vml" xmlns:o =
>>"urn:schemas-microsoft-com:office:office" xmlns:w =
>>"urn:schemas-microsoft-com:office:word" xmlns:st1 =
>>"urn:schemas-microsoft-com:office:smarttags">
>>Yes, to clarify...
>>
>>Can I use one double pole switch, rated at 15A, to turn on two 100 watt
>>halogen (Incandescent load) landing lights? The switch poles are not
>>considered to be in parallel because each is sending current to a
>>different location. Also, each circuit has it's own supply wire and
>>fuse. Is this correct?
>>
>>Bevan
>
> Correct. What you propose will be fine.
>
> Bob . . .
>
>
>
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