Today's Message Index:
----------------------
1. 05:10 AM - Aerial spacing requirements (Neville Kilford)
2. 06:59 AM - Re: fast on connectors (MikeEasley@aol.com)
3. 07:53 AM - What magnetic heading input? (David Carter)
4. 08:26 AM - Re: fast on connectors (Robert L. Nuckolls, III)
5. 08:37 AM - Fw: What magnetic heading input? (David Carter)
6. 08:53 AM - Re: Thread creep . . . (Robert L. Nuckolls, III)
7. 09:42 AM - gps noise in intercom (Thomas Johnson)
8. 10:24 AM - Re: Fw: What magnetic heading input? (Robert L. Nuckolls, III)
9. 11:47 AM - Need Help Understanding the electrical Diagram? (Julia)
10. 02:06 PM - RF interference (MARK H DELANO)
11. 03:15 PM - Noise & Wire Routing (Scott Bilinski)
12. 03:42 PM - Re: RF interference (Robert L. Nuckolls, III)
13. 03:48 PM - Re: Aerial spacing requirements (Robert L. Nuckolls, III)
14. 03:53 PM - Re: Need Help Understanding the electrical (Robert L. Nuckolls, III)
15. 05:03 PM - Re: gps noise in intercom (Larry Bowen)
16. 05:42 PM - Re: gps noise in intercom (DHPHKH@aol.com)
17. 06:22 PM - LED nav lights (Eric M. Jones)
18. 06:59 PM - Re: Wire bundles through firewall . . . (Charlie & Tupper England)
19. 06:59 PM - Re: Radio Wiring question (Charlie & Tupper England)
20. 07:01 PM - Re: Noise & Wire Routing (Robert L. Nuckolls, III)
21. 08:00 PM - Re: Wire bundles through firewall . . . (Robert L. Nuckolls, III)
22. 09:48 PM - New Feature on aeroelectric.com (Robert L. Nuckolls, III)
23. 10:07 PM - Re: New Feature on aeroelectric.com (Robert McCallum)
24. 10:36 PM - Re: New Feature on aeroelectric.com (Werner Schneider)
25. 10:53 PM - Re: New Feature on aeroelectric.com ()
Message 1
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| Subject: | Aerial spacing requirements |
--> AeroElectric-List message posted by: "Neville Kilford" <nkilford@etravel.org>
Hello all,
I'm currently building a Jodel D150 (2-seat side-by-side wooden tourer) in
the UK, and just running some cabling through the back of the plane before
sheeting over the turtledeck.
I'm mounting the aerials (transponder, NAV, COM) inside the fuselage, but I
can't find any information about aerial spacing. Is it critical for the
aerials to be a certain distance apart or will they work alright if they're
close together?
Any advice or information would be much appreciated. Many thanks in
anticipation.
Kind regards.
Neville Kilford
Message 2
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| Subject: | Re: fast on connectors |
--> AeroElectric-List message posted by: MikeEasley@aol.com
I agree with Bob that we sometimes spend too much time trying to improve
something that doesn't really need improving. But that's the way we
experimental aircraft builders think. I, personally, don't like
experimenting too much on my experimental aircraft. From the outset, I
purchased a Palladin CrimpALL ratcheting crimper with interchangable dies. I
have 6 sets of dies now and won't crimp anything on my aircraft without the
right size connector pin, and the right die set. We talk a lot on here about
failure points. I trying really hard to eliminate ME as a failure point by
using the right wire, connectors, tools, etc. AND not straying away from
proven techniques.
Message 3
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\"aeroelectric-list\"" <aeroelectric-list@matronics.com>
| Subject: | What magnetic heading input? |
--> AeroElectric-List message posted by: "David Carter" <dcarter@datarecall.net>
Just visited your web site ( http://www.fdatasystems.com/contact_information.htm
). Noticed the "winds" calculation feature. Didn't see a "magnetic heading"
input to the box, which is a "traditional" requirement to calculate winds.
Do you calculate wind differently, having enough other data, using ground track
and ground speed from GPS and TAS to calculate backwards to get "wind speed
and direction"?
If you can do this then you should also be able to calculate "mag heading" and
display it. Would be a nice poor man's stabilized mag compass - airborne only
- (based on GPS & ADC TAS info).
- Stabilized mag compass systems are quite expensive - this "solid state"
"back door calculated value" method would be a real financial boon to the homebuilt
aircraft market.
- When you package it in a round case, you could provide an analog type display
of a "gyro compass", in addition to the other items you already plan to
display. That way, I could select the "round dial stabilized mag compass" page
and put the instrument right below my attitude indicator to use as my "gyro
compass" in the instrument cross check.
David Carter
409-722-7259
Message 4
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| Subject: | Re: fast on connectors |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 09:58 AM 3/3/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: MikeEasley@aol.com
>
>I agree with Bob that we sometimes spend too much time trying to improve
>something that doesn't really need improving. But that's the way we
>experimental aircraft builders think. I, personally, don't like
>experimenting too much on my experimental aircraft. From the outset, I
>purchased a Palladin CrimpALL ratcheting crimper with interchangable dies. I
>have 6 sets of dies now and won't crimp anything on my aircraft without the
>right size connector pin, and the right die set. We talk a lot on here about
>failure points. I trying really hard to eliminate ME as a failure point by
>using the right wire, connectors, tools, etc. AND not straying away from
>proven techniques.
Incremental changes are the core of considered experimentation.
Burt Rutan used to advise "Wanna work on a new engine? Bolt
it to a C-172, Wanna build a new airplane? Bolt a Lycoming into
it." I'm paraphrasing but I think the meaning is clear. The
way to deal with a new idea is to incorporate it into a system
that is already stable. Once you're a few feet off the
ground, overall system stability is of paramount importance.
The prudent design and testing philosophy minimizes the numbers
of things which place pilot and machine at risk for any given
investigation.
I'm not suggesting that the thread discussing terminal
alternatives produced any threat or increased risk. In
fact, Figure 9-3 in the 'Connection illustrates a similar,
alternative technique which has been used for years to produce
entirely satisfactory terminal installations using solder
no less. My briefcase toolbox has a gas powered soldering
iron in it. I wouldn't hesitate to effect a field repair
on a wire using solder -OR- crimp on a bare terminal supported
with heat-shrink. I wouldn't worry about replacing the
terminal with PIDG when the airplane reaches friendlier
shop facilities.
Dan's suggestion is yet another alternative thoughtfully
reviewed and tested in his shop.
My thoughts about using this or any similar technique
for terminal installation IN ADDITION to PIDG technology
wasn't attractive. If you already have a PIDG tool for
small terminals, then a conscious effort to mix in another
technology that called for another tool wasn't cost/labor
effective.
Bob . . .
Message 5
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"aeroelectric-list" <aeroelectric-list@matronics.com>
| Subject: | Fw: What magnetic heading input? |
--> AeroElectric-List message posted by: "David Carter" <dcarter@datarecall.net>
For RV-list and Aeroelectric, here's the response re "magnetic heading" and
"wind" - reply is from the ADC vendor
David
----- Original Message -----
From: "Charles Newman" <support@fdatasystems.com>
Subject: Re: What magnetic heading input?
> David,
>
> Thanks for your question.
>
> There are three values the user must input to our
> unit. Heading, Barometric Pressure and Fuel added to
> tanks. When the "wind" page is selected on the
> AFP-30, the heading will initially show the GPS track.
> The user must then adjust it a few degrees to agree
> with his magnetic compass or DG to get an accurate
> winds aloft reading.
>
> I wish we could find the heading via a "back door"
> method, but it is not mathematically possible. We are
> searching for an economical magnetic heading sensor to
> feed realtime heading to our computer and perhaps a
> stand alone indicator as you suggested. For now it
> will require a small turn of the knob.
>
>
> Thanks for your interest,
>
> Charles Newman
> 831-662-9502
>
>
> --- David Carter <dcarter@datarecall.net> wrote:
> > Just visited your web site (
> > http://www.fdatasystems.com/contact_information.htm
> > ). Noticed the "winds" calculation feature. Didn't
> > see a "magnetic heading" input to the box, which is
> > a "traditional" requirement to calculate winds. Do
> > you calculate wind differently, having enough other
> > data, using ground track and ground speed from GPS
> > and TAS to calculate backwards to get "wind speed
> > and direction"?
> >
> > If you can do this then you should also be able to
> > calculate "mag heading" and display it. Would be a
> > nice poor man's stabilized mag compass - airborne
> > only - (based on GPS & ADC TAS info).
> > - Stabilized mag compass systems are quite
> > expensive - this "solid state" "back door calculated
> > value" method would be a real financial boon to the
> > homebuilt aircraft market.
> > - When you package it in a round case, you
> > could provide an analog type display of a "gyro
> > compass", in addition to the other items you already
> > plan to display. That way, I could select the
> > "round dial stabilized mag compass" page and put the
> > instrument right below my attitude indicator to use
> > as my "gyro compass" in the instrument cross check.
> >
> > David Carter
> > 409-722-7259
> >
>
>
> =====
>
>
Message 6
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| Subject: | Re: Thread creep . . . |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
There's been a rash of new messages to the list generated
by simply hitting "reply" to a message with an un-related
topic in the subject line. This makes it difficult for folks
too follow a specific conversation . . . it also places
the new message at risk of being ignored by folks who are
not participating in the topic listed in the subject line.
If you want to open a new topic, do you fellow list members and
yourself a favor . . . edit the subject line to reflect the
nature of your new topic.
Bob . . .
Message 7
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| Subject: | gps noise in intercom |
--> AeroElectric-List message posted by: "Thomas Johnson" <thomas.r.johnson@attbi.com>
I have a handheld Garmin 196 gps mounted on the panel which is causing a faint
hum in the intercom. It sounds like about 2400hz and it is not strong enough
to break squelch but can be heard whenever squelch is broken. This is something
I could ignore but I would really like to know what is going on here. Here
are a few other data points:
1) The on/off state of other panel items has no effect.
2) Unplugging the gps remote antenna has no effect.
3) Unplugging the gps power cord (gps now on internal battery) reduces the noise
slightly.
4) Changing gps backlight state has no effect.
5) As I move my hand closer to the gps unit the noise gets louder, as I pull my
hand away it gets softer.
6) It occurs with both my Lightspeed QFR and Peltor 7004 headsets, but it is worse
with the Peltor.
It seems the Garmin 196 is radiating something through my body and it ends up as
an audible hum in the intercom. Any comments or suggestions on this?
Tom Johnson, RV6
Message 8
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| Subject: | Re: Fw: What magnetic heading input? |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 10:36 AM 3/3/2003 -0600, you wrote:
>--> AeroElectric-List message posted by: "David Carter"
><dcarter@datarecall.net>
>
>For RV-list and Aeroelectric, here's the response re "magnetic heading" and
>"wind" - reply is from the ADC vendor
>
>David
<snip>
Dave, thanks for rattling his cage and publishing the results.
Good info . . .
Bob . . .
Message 9
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| Subject: | Need Help Understanding the electrical Diagram? |
--> AeroElectric-List message posted by: Julia <wings97302@yahoo.com>
Dear Bob:
Pardon my primitive electrical questions, but I started out wiring My RV following
your ideas and need some basic help getting the groundwork layed once my
basic circuits are layed I think I can take it from there. I really hate to
ask all this, but I really need some guidance here. The diagram Im following
has the following headings: Typical Wiring for Internal Regulator & OVM Installation
& Page 2.0 revised 2/20/01.
Questions:
1. The Alternator Disconnect (S701-1) the two small terminals, they are
not marked, does it matter which way they are used? Like the right might be
used as the top on the diagram or it could be used as the bottom one?
2. Out of the Starter Contactor (top Right of diagram) the upper small
terminal line goes to a sqwiggly line does that mean it goes to the Main buss
which also has a sqwiggly line at the bottom?
3. Out of the Battery Contactor (upper Left of diagram) you have a line
which goes to a 20 AWG fuselink then to a dot with an X whats the dot & X
all about? And where does it go to?
4. Is the OVM-14 the same thing as a Crowbar OV protection module mentioned
in other diagrams?
5. How do I fit an Essential bus into this picture? My guess is as follows:
run a line from the Main buss shown in the diagram to a diode and then
to the E-Bus. Then from the Positive side of the battery, I just run line with
a fusable link in it and then a switch and then to the E-Bus hey thats about
what it looks like comes out of the Battery Contactor (Left side top terminal)
the line with the black dot and X - is that what thats all about? (ref. item
3 above).
6. On the Battery/alternator Master Switch pins #3 and #6 do not go anywhere?
Whats up with that? Are they not used for this layout just left blank?
Ive already mounted some items and begun wiring so I really need to proceed with
this layout. Your help would be much appreciated.
Thanks.
---------------------------------
Message 10
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--> AeroElectric-List message posted by: "MARK H DELANO" <delano60@email.msn.com>
I recently purchased a $300 non TSOd electric turn and bank. The unit is very small
and looks great, however when the com is turned on it sounds like a vacuum
cleaner. I have never heard RF interference to this extreme. Any suggestions
as to a fix. I placed a .01 cap across the power with no change. Is this typical
of these inexpensive turn & banks.
Thanks
Mark Delano
Message 11
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| Subject: | Noise & Wire Routing |
--> AeroElectric-List message posted by: Scott Bilinski <bilinski@kyocera-wireless.com>
My shielded strobe wires are going be about 6 inches from my Com antenna
cable (RG-400) at the closest point. Will this be ok?
Scott Bilinski
Eng dept 305
Phone (858) 657-2536
Pager (858) 502-5190
Message 12
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| Subject: | Re: RF interference |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 03:19 PM 3/3/2003 -0800, you wrote:
>--> AeroElectric-List message posted by: "MARK H DELANO"
><delano60@email.msn.com>
>
>I recently purchased a $300 non TSOd electric turn and bank. The unit is
>very small and looks great, however when the com is turned on it sounds
>like a vacuum cleaner. I have never heard RF interference to this extreme.
>Any suggestions as to a fix. I placed a .01 cap across the power with no
>change. Is this typical of these inexpensive turn & banks.
Most of these devices will give it up to a line noise
filter. See:
http://www.aeroelectric.com/articles/filter/filter.html
don't forget to download the linked wiring diagram at
http://www.aeroelectric.com/articles/filter/filter.pdf
Bob . . .
Message 13
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| Subject: | Re: Aerial spacing requirements |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 01:10 PM 3/3/2003 +0000, you wrote:
>--> AeroElectric-List message posted by: "Neville Kilford"
><nkilford@etravel.org>
>
>Hello all,
>
>I'm currently building a Jodel D150 (2-seat side-by-side wooden tourer) in
>the UK, and just running some cabling through the back of the plane before
>sheeting over the turtledeck.
>
>I'm mounting the aerials (transponder, NAV, COM) inside the fuselage, but I
>can't find any information about aerial spacing. Is it critical for the
>aerials to be a certain distance apart or will they work alright if they're
>close together?
>
>Any advice or information would be much appreciated. Many thanks in
>anticipation.
>
>Kind regards.
>Neville Kilford
Every manufacturer of a device that uses an antenna will
tell you that the best performance will be had if HIS
antenna is at least 100 yards away from everyone else's
antenna. Given that we're wiring airplanes instead of football
fields, you just do the best you can. It's a good idea to
keep antennas of near frequency (nav and comm, transponder and
dme) as far from each other as practical . . . but they
work quite happily near antennas that are several factors
away in operating frequency.
Antennas on an airplane don't have to be ideal. Virtually
all aviation radio services are line of sight. Your radios
would perform at some useful level using a wet string hung
out the window. Putting a "more efficient" antenna on will
only make things better . . . don't loose any sleep over
how much abuse you're heaping on the radios by making
them share limited antenna space on your airframe.
Bob . . .
Bob . . .
|-------------------------------------------------------|
| The man who does not read good books has no advantage |
| over the man who cannot read them. |
| - Mark Twain |
|-------------------------------------------------------|
Message 14
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| Subject: | Re: Need Help Understanding the electrical |
Diagram?
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 11:45 AM 3/3/2003 -0800, you wrote:
>--> AeroElectric-List message posted by: Julia <wings97302@yahoo.com>
>
>
>Dear Bob:
>
>
>Pardon my primitive electrical questions, but I started out wiring My RV
>following your ideas and need some basic help getting the groundwork
>layed once my basic circuits are layed I think I can take it from
>there. I really hate to ask all this, but I really need some guidance
>here. The diagram Im following has the following headings: Typical Wiring
>for Internal Regulator & OVM Installation & Page 2.0 revised 2/20/01.
>
>
>Questions:
>
>1. The Alternator Disconnect (S701-1) the two small terminals,
>they are not marked, does it matter which way they are used? Like the
>right might be used as the top on the diagram or it could be used as the
>bottom one?
>
>
>2. Out of the Starter Contactor (top Right of diagram) the upper
>small terminal line goes to a sqwiggly line does that mean it goes to the
>Main buss which also has a sqwiggly line at the bottom?
>
>
>3. Out of the Battery Contactor (upper Left of diagram) you have
>a line which goes to a 20 AWG fuselink then to a dot with an X whats the
>dot & X all about? And where does it go to?
>
>
>4. Is the OVM-14 the same thing as a Crowbar OV protection module
>mentioned in other diagrams?
>
>
>5. How do I fit an Essential bus into this picture? My guess is
>as follows: run a line from the Main buss shown in the diagram to a diode
>and then to the E-Bus. Then from the Positive side of the battery, I just
>run line with a fusable link in it and then a switch and then to the
>E-Bus hey thats about what it looks like comes out of the Battery
>Contactor (Left side top terminal) the line with the black dot and X -
>is that what thats all about? (ref. item 3 above).
First, keep in mind that all of our drawings are COLLECTIONS of features,
not all of which may apply to your project. You need to make a list of
electrical items in your airplane and decide if they will be powered from
the main bus, e-bus or battery bus.
Let's ignore the drawings that come with the OVM-14 . . . they need to
be very generic and cover as many bases as possible because the OVM-14
gets installed in a LOT of different airplanes.
Let's start with the latest Figure 11 which is being prepared for
Rev 11 of the book. Download it from
http://216.55.140.222/temp/z11h.pdf
. . . start over and develop you list of questions from this drawing
only . . .
>6. On the Battery/alternator Master Switch pins #3 and #6 do not
>go anywhere? Whats up with that? Are they not used for this layout just
>left blank?
Yes, connections cited but unconnected are treated just as they
are shown . . . no connection.
>Ive already mounted some items and begun wiring so I really need to
>proceed with this layout. Your help would be much appreciated.
Okay, let's drop back a few steps and start over. Get
the drawing cited above. . .
Bob . . .
Message 15
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| Subject: | gps noise in intercom |
--> AeroElectric-List message posted by: "Larry Bowen" <Larry@BowenAero.com>
Shoot. I have a panel mounted 196 also. I don't have enough of the
wiring done to test this condition, but hope to soon. Let us know what
you learn.
-
Larry Bowen
Larry@BowenAero.com
http://BowenAero.com
2003 - The year of flight!
> -----Original Message-----
> --> AeroElectric-List message posted by: "Thomas Johnson"
> --> <thomas.r.johnson@attbi.com>
>
> I have a handheld Garmin 196 gps mounted on the panel which
> is causing a faint hum in the intercom. It sounds like about
> 2400hz and it is not strong enough to break squelch but can
> be heard whenever squelch is broken. This is something I
> could ignore but I would really like to know what is going on
> here. Here are a few other data points:
>
> 1) The on/off state of other panel items has no effect.
> 2) Unplugging the gps remote antenna has no effect.
> 3) Unplugging the gps power cord (gps now on internal
> battery) reduces the noise slightly.
> 4) Changing gps backlight state has no effect.
> 5) As I move my hand closer to the gps unit the noise gets
> louder, as I pull my hand away it gets softer.
> 6) It occurs with both my Lightspeed QFR and Peltor 7004
> headsets, but it is worse with the Peltor.
>
> It seems the Garmin 196 is radiating something through my
> body and it ends up as an audible hum in the intercom. Any
> comments or suggestions on this?
>
> Tom Johnson, RV6
>
Message 16
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| Subject: | Re: gps noise in intercom |
--> AeroElectric-List message posted by: DHPHKH@aol.com
<<I have a handheld Garmin 196 gps mounted on the panel which is causing a
faint hum in the intercom.>>
Interesting. I had a borrowed Garmin 195 strapped to my leg
while flying an open biplane to OSH a few years ago. No intercom, just a
David Clark headset patched to an Icom handheld. Kept hearing a strange
"zing, zing" kind of noise, and finally figured out it got louder when I
moved the headset closer to the GPS. Haven't thought about it since.
Dan
Message 17
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--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
It should be pointed out that LEDs that have high luminous output always have low
angular coverage, since one is dependent on the other. Whenever one sees "6000
mcd" the small print says "10 degrees". The LEDs needed for Nav (or other
beacon lamps) are very wide angle, NOT high brightness. The high brightness/small
angle lamps are only good for flashlights (Okay...great flashlights...!).
For a (simple) engineering discussion of using LEDs in Nav lights and how to calculate
the basics, see my website www.PerihelionDesign.com under Builders Aids.
Thanks Jerzy Krasinski for the eBay LED site. Good source.
Regards,
Eric M. Jones
Message 18
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| Subject: | Re: Wire bundles through firewall . . . |
--> AeroElectric-List message posted by: Charlie & Tupper England <cengland@netdoor.com>
Robert L. Nuckolls, III wrote:
>--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
>
>A few days ago, a general question popped up about wire bundles
>through the firewall with specific question about EMI problems
>that drive a requirement to separate some bundles. I put off
>answering the question until after finishing the comic book
>at
>
>http://www.aeroelectric.com/articles/Firewall_Penetration/firewall.html
>
>. . . but now, I can't find the original message. If the
>questioner is on the list, check out the link above and know
>that this particular airplane runs ALL wires that pass through
>the firewall in the same bundle. The firewall fitting illustrated
>is the only one on the airplane for wires. Everything else goes
>through eye-balls or all metal bulkhead fittings for fluid
>lines. There are no concerns for inter-system interference
>by virtue of having routed all the wires together (This
>is another thing that DO-160 does for us).
>
>Some folks are enamored of putting connectors in
>wire bundles so that removing an engine doesn't require
>so much attention to disconnecting and re-connecting
>individual conductors. For a time, Lancair even provided/
>recommended an AMP CPC bulkhead feed-through for this
>purpose. I wouldn't recommend any kind of plastic fitting
>through a firewall.
>
>If you want to include convenience connectors in large
>wire count bundles, CPC connectors are fine but make
>them cable/cable connectors pendant on a short bundle
>of wires inside the engine compartment. You can wrap this
>junction with a couple of layers of silicone guide-line
>tape to reduce effects of environment on the connector.
>
>
> Bob . . .
>
FWIW, in the non-aviation world, cross-talk reduction among various
cables is normally handled by having the cables cross rather than
parallel each other. The premise is that this minimizes electromagnetic
coupling between the wires. I would think that various cables
converging at a single hole in the firewall and then diverging on the
other side would approximate this technique.
Charlie
Message 19
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| Subject: | Re: Radio Wiring question |
--> AeroElectric-List message posted by: Charlie & Tupper England <cengland@netdoor.com>
Vince Ackerman wrote:
>--> AeroElectric-List message posted by: Vince Ackerman <vack@mac.com>
>
>Charlie
>
>Thanks for the info!
>
>The wiring diagram for the 250xl comm shows the 2 Comm audio leads
>coming out as a hi and low, both going to an "audio panel." It doesn't
>really specify what goes to what. It also shows the shield wire, with a
>note to ground the shield at the audio panel. On the shield end of the
>250xl, the diagram indicates that the shield doesn't appear to be
>connected to anything, unlike other shields such as the Mic. Should I
>assume the shield for the comm goes to ground with the rest (the black
>and shield wires on the DRE)? It's a little confusing how this works.
>
It's quite likely that 'hi & lo' are audio & audio return if they are
both routed to the audio panel. Use an ohm meter to check for continuity
between the 'low' wire & ground in the 250. A reading anywhere near
zero means it's the return for the 'hi' wire.
I would tie the shield to the audio panel ground if that's specified in
the 250's diagram.
>
>The DRE does override the passenger audio. Both wire bundles for the
>Pilot and Pax go past the control sticks so instead of running wires
>back from the jacks by the headrests I was just going to splice into
>the bundles near each stick to go to the PTT 's on the grips.
>
That should work fine.
>
>Thanks
>
>George
>
>On Sunday, Mar 2, 2003, at 11:38 US/Pacific, Charlie & Tupper England
>wrote:
>
>
>
>>Hi usually means audio; low usually means audio return or audio ground.
>>Look at the radio's hookup diagram & be sure they aren't sending the
>>'high' to a speaker & the 'low' to the headphones.
>>
>>Audio 'grounds' are usually kept isolated from the airframe to prevent
>>'ground loops', or noise in the audio circuits.
>>
>>Hard to say about the unlabeled shield; it could be intended to provide
>>noise shielding for the audio output wires & left floating at the
>>other end.
>>
>>
>>
>
>
>
>
Message 20
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| Subject: | Re: Noise & Wire Routing |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 03:14 PM 3/3/2003 -0800, you wrote:
>--> AeroElectric-List message posted by: Scott Bilinski
><bilinski@kyocera-wireless.com>
>
>My shielded strobe wires are going be about 6 inches from my Com antenna
>cable (RG-400) at the closest point. Will this be ok?
>
Sure . . .
Bob . . .
Message 21
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| Subject: | Re: Wire bundles through firewall . . . |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
>
> >
> > Bob . . .
> >
>FWIW, in the non-aviation world, cross-talk reduction among various
>cables is normally handled by having the cables cross rather than
>parallel each other. The premise is that this minimizes electromagnetic
>coupling between the wires. I would think that various cables
>converging at a single hole in the firewall and then diverging on the
>other side would approximate this technique.
>
>Charlie
Never encountered an interference problem that propagated
across parallel cables where the cables are carefully
configured . . . twisted pair, properly shielded, etc.
There are many systems aboard an aircraft that are
FORCED to share wire routing. DO-160 requirements
put considerable emphasis on designing it right the
first time.
It really isn't hard or expensive to do . . .
It's so routine that one seldom even thinks about
it in the process of configuring a new product
for aviation.
Bob . . .
Message 22
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| Subject: | New Feature on aeroelectric.com |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
Over the years, I've been able to supply a number of
pin-out diagrams for some of the golden oldie radios
and a few of the newer ones as well. I've placed a
compendium of recent requests on:
http://www.aeroelectric.com/Installation_Data
If you don't find what you need there at any time, drop
me a note and I'll see if I can add your request to
the archive. This is a permanent addition to the
website.
Also, the latest CD_Rom has been uploaded to
http://www.aeroelectric.com/CD/AEC7_1.zip
Would be interested in getting feedback from folks
who have successfully downloaded and unpacked the
latest edition.
Thanks!
Bob . . .
|-------------------------------------------------------|
| The man who does not read good books has no advantage |
| over the man who cannot read them. |
| - Mark Twain |
|-------------------------------------------------------|
Message 23
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| Subject: | Re: New Feature on aeroelectric.com |
--> AeroElectric-List message posted by: Robert McCallum <robert.mccallum2@sympatico.ca>
"Robert L. Nuckolls, III" wrote:
> Would be interested in getting feedback from folks
> who have successfully downloaded and unpacked the
> latest edition.
>
> Thanks!
Bob;
The CD link does not appear to lead anywhere. Tried both with Netscape 7 and Internet
Explorer 6.0
In both cases came up with a blank page. The wiring schematics work fine. I was
able to successfully
retrieve the previous CD version earlier if this fact is any clue to what's happening.
--
Bob McC
DO NOT ARCHIVE
Message 24
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| Subject: | Re: New Feature on aeroelectric.com |
--> AeroElectric-List message posted by: "Werner Schneider" <wernerschneider@compuserve.com>
I could download it without any problems with Internet Explorere 5.5 SP2,
(right button on link, save as), the download speed was 106 kByte/s
(848kBit) average over a 10 MB Internetlink, last time was faster, but I
might not been the only one downloading it.
Werner
----- Original Message -----
From: "Robert McCallum" <robert.mccallum2@sympatico.ca>
Subject: Re: AeroElectric-List: New Feature on aeroelectric.com
> --> AeroElectric-List message posted by: Robert McCallum
<robert.mccallum2@sympatico.ca>
>
> "Robert L. Nuckolls, III" wrote:
>
> > Would be interested in getting feedback from folks
> > who have successfully downloaded and unpacked the
> > latest edition.
> >
> > Thanks!
>
> Bob;
> The CD link does not appear to lead anywhere. Tried both with Netscape 7
and Internet Explorer 6.0
> In both cases came up with a blank page. The wiring schematics work fine.
I was able to successfully
> retrieve the previous CD version earlier if this fact is any clue to
what's happening.
> --
> Bob McC
> DO NOT ARCHIVE
>
>
Message 25
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| Subject: | Re: New Feature on aeroelectric.com |
--> AeroElectric-List message posted by: <315@cox.net>
Downloaded just fine. Unzipped just fine. Thanks!
Using Internet Explorer 6.0 and Winzip.
Ned
----- Original Message -----
From: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
Subject: AeroElectric-List: New Feature on aeroelectric.com
> --> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
<bob.nuckolls@cox.net>
>
> Over the years, I've been able to supply a number of
> pin-out diagrams for some of the golden oldie radios
> and a few of the newer ones as well. I've placed a
> compendium of recent requests on:
>
> http://www.aeroelectric.com/Installation_Data
>
> If you don't find what you need there at any time, drop
> me a note and I'll see if I can add your request to
> the archive. This is a permanent addition to the
> website.
>
> Also, the latest CD_Rom has been uploaded to
>
> http://www.aeroelectric.com/CD/AEC7_1.zip
>
>
> Would be interested in getting feedback from folks
> who have successfully downloaded and unpacked the
> latest edition.
>
> Thanks!
>
>
> Bob . . .
>
> |-------------------------------------------------------|
> | The man who does not read good books has no advantage |
> | over the man who cannot read them. |
> | - Mark Twain |
> |-------------------------------------------------------|
>
>
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