Today's Message Index:
----------------------
0. 12:46 AM - More Great List Comments - Please Make A Contribution! (Matt Dralle)
1. 03:37 AM - Re: Z-19 questions (Rodney Dunham)
2. 03:47 AM - Re: Re: Icom A200-Help! (Rodney Dunham)
3. 04:03 AM - Ground vs Return (Rodney Dunham)
4. 04:52 AM - Re: Z-19 questions (JOHN TIPTON)
5. 05:43 AM - Re: Re: 24V 12V grounds (FLYaDIVE@aol.com)
6. 07:43 AM - Pitot heater - current sensor (John Tvedte)
7. 07:46 AM - Auto-pilots (Bob Verwey)
8. 08:20 AM - Re: Icom A200-Help! (Bill McMullen)
9. 10:26 AM - Re: Auto-pilots (Kevin Horton)
10. 04:20 PM - Fw: Ampmeter reading (Carlos Trigo)
11. 04:57 PM - travelliing to Ottawa (Jim Jewell)
12. 05:23 PM - Re: Fw: Ampmeter reading (Ken)
13. 06:27 PM - Re: To ground loop . . . or not, that IS the question. (Robert L. Nuckolls, III)
14. 06:27 PM - Re: To ground loop . . . or not, that IS the question. (Robert L. Nuckolls, III)
15. 06:28 PM - Re: Z-19 questions (Robert L. Nuckolls, III)
16. 06:30 PM - Re: Z-19 questions (Robert L. Nuckolls, III)
17. 08:02 PM - Re: Pitot heater - current sensor (Robert L. Nuckolls, III)
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Subject: | More Great List Comments - Please Make A Contribution! |
Dear Listers,
There's a little less than one week left for this year's List Fund Raiser. I thought
it would a great time to share a few more of the great comments I've been
receiving from Contributors regarding what the Lists mean to them. There are
some particularly poignant ones in this batch and I encourage you to have a
look at some of them.
Don't forget that once you make your Contribution, the Contribution Squelch kicks
in and you won't receive any future messages from me regarding the Fund Raiser
this year! This holds true for the Realtime and Digest distributions and
now also the HTML and TXT links included with the Digest! (Note that for technical
reasons, if someone replies to one of my contribution messages, the Squelch
will _not_ be activated, and you will still receive it. Contribution messages
will also still be found on the Forums site and the List Browse).
Please make your Contribution today to support these List services! Pick up a
great Gift too!
http://www.matronics.com/contribution
Thank you!
Matt Dralle
Matronics Email List Administrator
============================= WLAS #2 ============================
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Another year of great service! Once again, the
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have any help readily available. Without the List,
I could not have embarked on building my RV-10. -Jim H
You run a great list there. -James H
Really like the Kolb List. -Don W
============================= WLAS #2 ============================
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Simon,
Now THAT'S how a gentleman apologizes! Our politicians could take a lesson
from you :o)
Rodney in Tennessee
DO NOT ARCHIVE
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Subject: | Re: Icom A200-Help! |
No such thing as over-cautious.
You are correct that the pinout on the .pdf file is wrong.
You are also correct that the pinout letters and numbers are embossed on the
connector. With a pair of +1.25 Diopter "cheater" from Walgreen's and a good
bright light, I can just barely read them.
Go with the IC-A200 "Installation Instructions". They work well.
Rodney in Tennessee
PS, mine never had a Polarizing Key. Still works fine.
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Subject: | Ground vs Return |
Barry,
As a physician, I am confronted with this "ground loop" versus "return loop"
versus "assymetrical supply and ground" debate but in a different form.
It goes something like this...
The patient reports (some say "complains of", see, it starts already) runny
nose, fever, aching all over and various other symptoms. I examine the
patient and diagnose "Respiratory Tract Infection". Until recently this was
called "Upper Respiratory Infection" and, in fact, still is by most "in the
business". The patient says, "Is this a 'Sinus Infection' Doc?" To which I
reply, "Yes." You must understand that the patient does NOT have a Sinus
infection as defined by a board certified Otorhinolaryngologist! But, it's
close enough and everybody knows that what I meant was RTI, and everybody is
happy and no harm is done to the patient, the doctor, the general populace
or the medical community at large!
The patient is not a doctor. So, hammering out the differences of
nomenclature serves absolutely no purpose. Further, I know what the problem
is based on symptoms and I know how to fix it which I promptly do. Isnt'
THAT the purpose of this activity???
Now, I'm just a lowly physician, not an EE or any other kind of engineer
except a shade tree HE (that's Human Engineer to those not quite following
this thought). But I consider myself among the lucky ones that has studied
Nuckolls and others and know enough to diagnose and treat a few electrical
issues. Like most on this list, I understand (even in my ignorance) that
airplanes cannot be attached to THE ground and therefore do not have a REAL
ground. I understand that the battery negative terminal is the source of all
electrons into the system and the positive terminal receives all of them
back. I understand that there are multiple points of egress out of the wires
after they leave their many branches from the battery minus terminal and
multiple points on ingress as they make their way back to the positive
terminal. And that differences in potential exist because all wires have
some measure of resistance, not being "perfect" conductors. Like Greg
Righter (and maybe you?), I think that the whole idea of "ground" should be
scrapped in favor of the simpler and more correct concept of "return".
BUT...
Since we all understand the basic physics of electrons, there's no harm and
no foul to call a return a "ground" so long as we don't make errors in our
thinking due to that "improper" nomenclature. If and when these errors are
noted, I for one would appreciate a GENTLE reminder of the physics and a
rudimentary lesson on the topic. That's what we're all here for. And that
could be your very valuable contribution to this community. I, for one,
think you have a lot to offer, but the TONE brother. The TONE! Forget tha
Yamashithead stuff. We're on your side. We WANT to learn. You seem to have a
yen to teach. That seems like a perfect match to me. Let's get on with it
like gentlemen!
Rodney in Tennessee
DO NOT ARCHIVE
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Message 4
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Subject: | Re: Z-19 questions |
Is this what our friendly discussion group has come to
John
"S. Ramirez" wrote:
Mofo,
I can download it. I'm doing it right now! I thought this book cost
money,
and here it is in PDF on the fucking internet.
I'll see you at the airport Saturday morning.
Thanks a bunch.
Simon Ramirez, Consultant
Synchronous Design, Inc.
Oviedo, FL 32765 USA
407-365-8928: home/office
407-221-8928: mobile
Xilinx Alliance Partner
Copyright C 2006
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Bill
Bradburry
Sent: Thursday, November 23, 2006 11:53 AM
To: aeroelectric-list@matronics.com
Subject: AeroElectric-List: Z-19 questions
-->
I really would like some advice on the below question. I assume that
it
seems pretty simple to some but it is beyond me....
Thanks, and Happy Thanksgiving.
Bill B
*Subject:* */Z-19 questions/*
*From:* */Bill Bradburry/ (/bbradburry@allvantage.com/
49E28.9030501@allvantage.com>)*
*Date:* */*Wed Nov 22 - 11:00 AM*/*
*Bob, and others,
I am installing a fuel injected Mazda rotary engine and trying to
follow
the Z-19 guidelines for dual battery, single alternator. Looking at
the
engine primary and secondary circuit, I need to install a primary
and
secondary fuel pump, plus I want to power the coils and
Message 5
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Subject: | Re: 24V 12V grounds |
In a message dated 11/23/2006 10:31:05 PM Eastern Standard Time,
nuckollsr@cox.net writes:
"There is no such
thing as a DC system." Even a battery generates some
"wiggles" in output voltage as electrons within the chemistry
jump from ion to ion.
===========================================
Hi Bob:
I do live on my own planet, but unfortunately I have to share it; I would
even accept a planetoid.
GREAT statement above Bob. That is what I learned also. We must have read
the same books at one time or another.
But, why in your GROUND explaination/seranio (your post explaining ground
loops) did you pick thermocouples and group them under the DC Ground umbrella?
If you recall thermocouples when first produced were done so as a floating
(non-grounded) device. And in many cases as a non-shieled device. This led to
may erroneous reading on the gages ESPECIALLY when digital read-outs with low
voltage sensing circuits came into play. So the method of correcting and
stabilizing became a GROUNDED thermocouple. But, in this case you are talking
Fruit Salad ... You know ... Apples & Oranges. They are close, but throwing them
into the same bowl, I feel does not truly explain the issue. I think it is
only confusing to many out there. Too much Tech-Know-Babble, sounding too much
like Professor Irwin Cory.
The topic is DC GROUNDS. And you know me I keep things SIMPLE ... K.I.S.S.
M.E. SIMPLE.
And for those that just might still be interested in the basics and how to
eliminate about 98% of your electronical issues and NOISE issues here is the
short version of the basics:
GROUND at the SOURCE (Alternators, Batteries, Avionics and the like).
CLEAN YOUR GROUNDS
ADD MORE GROUNDS to DC Circuits - Battery to Engine, Battery to Firewall,
Firewall (after additional grounds have been added) to Panel and YES I strongly
believe in a nice heavy gage Ground Terminal Block. Or at least a Brass Nut &
Bolt.
[I believe my above statement is what started this debate - MORE Grounds do
HELP]
DC Circuits Ground at BOTH ENDS
AF (Audio Frequencies) Ground ONLY at the Source
RF (Radio Frequencies) Ground at BOTH ends
Crazy thing here ... Alternators produce BOTH AF & RF, so what do you do?
GROUND at BOTH Ends. YES! GROUND!
After you do the grounding THEN you can start playing with Inductors &
Capacitors and Transient Suppressors.
This is the short list. I very seldom need to do more than that to prevent or
remove a problem.
Barry
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Subject: | Pitot heater - current sensor |
Bob,
Say - I noticed diagram PitotHeat.pdf on your website...
This seems like a slick low cost way to know if your pitot heater is
actually drawing current.
Could I also use this for a fuel boost pump?
Do you have a picture of a finished unit and how you would wrap the wire
around it, heat shrink, etc?
Thanks,
John
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Hey listers,
I'm looking around at auto-pilots. Obviously searched the net a bit, but
still wondering, any recommendations from the list?
Bob Verwey
A35 Bonanza ZU-DLW
Message 8
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Subject: | Re: Icom A200-Help! |
Rodney : Thanks for the re-inforcement that I'm really not going crazy as the grey
hairs start increasing. I only wish I could get away with just +1.25 cheaters
to see these markings ... they're some of the hardest ones to read.
I sincerely hope Bob sees this and updates his diagram. It's a great expansion
on a very poor installation manual but my biggest concern is that someone goes
with it's pinout diagram rather than getting out their magnifying glass and
looking at the physical connector. I am surprised that no one else has noted
and commented on this discrepency.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=76759#76759
Message 9
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On 24-Nov-06, at 10:44 AM, Bob Verwey wrote:
> Hey listers,
> I'm looking around at auto-pilots. Obviously searched the net a
> bit, but still wondering, any recommendations from the list?
>
> Bob Verwey
> A35 Bonanza ZU-DLW
Do you need an installation for a type-certificated aircraft, or
amateur-built? What capabilities do you want? Wing leveler only?
Heading select? Altitude hold? Airspeed hold? Vertical speed
hold? Altitude preselect? Coupled ILS? Coupled GPS? Coupled
approach VNAV?
Kevin Horton
RV-8 (Finishing Kit)
Ottawa, Canada
http://www.kilohotel.com/rv8
Message 10
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Subject: | Ampmeter reading |
Since I only got 1 answer (thanks Tim), here it goes again:
Bob et all
I installed a digital Ampmeter, connected to a 50mV Shunt which is
installed in the #6 cable which comes from the alternator (Subaru
engine) to my Exp Bus board.
I assume that this ampmeter indicates the current being produced by the
alternator, obviously with the engine running.
But, every time I run the engine (stil at my garage, not yet flying),
the ampmeter indication runs very quickly from, let's say 13.7 down to
8.2, then up to 14,6, again down and again up, very quickly.
Why am I geting this kind of reading?
Anything wrong or it's just indicating what it shoud?
Carlos
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Subject: | travelliing to Ottawa |
I will be visiting in the Ottawa area from this coming Thursday Nov. 30
until Dec 9.
I will have time to sight see and visit in and around the Ottawa area.
If any aircraft homebuilders want to share and compare notes and pictures,
coffee, etc. please advise as to contact information.
Thanks,
Jim in Kelowna - Finished RV6-A waiting for the paperwork to be returned
Message 12
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Subject: | Re: Ampmeter reading |
Carlos
I don't think there are many Exp bus user's here but I would consider
this abnormal unless you have a flashing beacon or something that is
intermittantly drawing current. Does the voltage fluctuate? My hall
current sensor is quite steady on my EIS monitor with my Subaru. I do
have strobes. The current pulses to the injectors and ignition do vary
by several amps but that happens much too quickly for current sensors or
voltmeters to register anything other than a steady average current.
Ammeters just aren't fast enough to register those pulses. There are
some posts in the archives about fluctuating ammeters that might assist you.
Ken
Carlos Trigo wrote:
> Since I only got 1 answer (thanks Tim), here it goes again:
>
> Bob et all
>
> I installed a digital Ampmeter, connected to a 50mV Shunt which is
> installed in the #6 cable which comes from the alternator (Subaru
> engine) to my Exp Bus board.
> I assume that this ampmeter indicates the current being produced by
> the alternator, obviously with the engine running.
> But, every time I run the engine (stil at my garage, not yet flying),
> the ampmeter indication runs very quickly from, let's say 13.7 down to
> 8.2, then up to 14,6, again down and again up, very quickly.
> Why am I geting this kind of reading?
> Anything wrong or it's just indicating what it shoud?
>
> Carlos
>
>
Message 13
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Subject: | Re: To ground loop . . . or not, that IS the question. |
At 08:42 AM 11/24/2006 -0500, you wrote:
>In a message dated 11/23/2006 10:31:05 PM Eastern Standard Time,
>nuckollsr@cox.net writes:
>"There is no such
> thing as a DC system." Even a battery generates some
> "wiggles" in output voltage as electrons within the chemistry
> jump from ion to ion.
>
>===========================================
>Hi Bob:
>
>I do live on my own planet, but unfortunately I have to share it; I would
>even accept a planetoid.
>
>GREAT statement above Bob. That is what I learned also. We must have
>read the same books at one time or another.
Then you agree with Eric's assertion that once a DC
system "wiggles" that it has now morphed into an AC
system?
>
>But, why in your GROUND explaination/seranio (your post explaining ground
>loops) did you pick thermocouples and group them under the DC Ground
>umbrella?
>If you recall thermocouples when first produced were done so as a floating
>(non-grounded) device. And in many cases as a non-shieled device. This
>led to may erroneous reading on the gages ESPECIALLY when digital
>read-outs with low voltage sensing circuits came into play. So the method
>of correcting and stabilizing became a GROUNDED thermocouple.
Yup, you do live on a different planet. I've never had to
shield a thermocouple. Digital instruments intended to
read thermocouple voltages came with specifications as
to what kind and amount of common mode voltages they would
tolerate. I've worked with all of them. If one understands
the performance and limits of the hardware at hand, one
may expect reliable results.
So, assuming you're using equipment that is NOT tolerant
of whatever common mode noises are present and assuming further
that you DO ground the thermocouple at the sense end and
your measurement equipment is also grounded at some other
point in the system, then yes . . . one should not be surprised
that the GROUND LOOP so generated produces poor results.
> But, in this case you are talking Fruit Salad ... You know ... Apples &
> Oranges. They are close, but throwing them into the same bowl, I feel
> does not truly explain the issue. I think it is only confusing to many
> out there. Too much Tech-Know-Babble, sounding too much like Professor
> Irwin Cory.
Okay, how about use of remote sensing in power generation
control systems . . . or the case I cited where we fixed
an instrumentation interference problem by making eliminating
a ground loop in the airplane's DC power sysrem?
>The topic is DC GROUNDS. And you know me I keep things SIMPLE ...
>K.I.S.S. M.E. SIMPLE.
>And for those that just might still be interested in the basics and how to
>eliminate about 98% of your electronical issues and NOISE issues here is
>the short version of the basics:
>GROUND at the SOURCE (Alternators, Batteries, Avionics and the like).
>CLEAN YOUR GROUNDS
>ADD MORE GROUNDS to DC Circuits - Battery to Engine, Battery to Firewall,
>Firewall (after additional grounds have been added) to Panel and YES I
>strongly believe in a nice heavy gage Ground Terminal Block. Or at least
>a Brass Nut & Bolt.
>[I believe my above statement is what started this debate - MORE Grounds
>do HELP]
No, you said:
"There is NO SUCH FREEKEN thing as a GROUND LOOP in a DC circuit."
>AC Circuits Ground at BOTH ENDS
>AF (Audio Frequencies) Ground ONLY at the Source
>RF (Radio Frequencies) Ground at BOTH ends
>Crazy thing here ... Alternators produce BOTH AF & RF, so what do you
>do? GROUND at BOTH Ends. YES! GROUND!
>After you do the grounding THEN you can start playing with Inductors &
>Capacitors and Transient Suppressors.
>
>This is the short list. I very seldom need to do more than that to prevent
>or remove a problem.
Now that's an illuminating dissertation. If it's "babble"
one is striving for, you've achieved it. I'm sure every new
builder on the List now knows exactly what you're describing but
the fact that you're finding issue with my words suggests that
that chapters on grounding, noise combined with architecture drawings
in appendix Z in the 'Connection are are now in doubt. Barry, I just don't
have the time or energy to discuss this with you. If you have
a goal of being helpful, it's just not coming through.
Tell you what. Write up a critical review of the work you find
in the 'Connection. Be specific. Use clear words and syntax that
brings to light anything I've written that leads anyone astray. If you
want to be a teacher in this venue, you'll have to act like one.
Ship me the document and I'll publish it on the website.
Here's an example of the format:
http://aeroelectric.com/articles/rules/review.html
You've demeaned my honor and my intelligence. Now back it
up with simple-ideas and illuminating anecdotes from your
experience. But if all you're going to do is sit on the
edge and throw in mud balls, then go away. You're not
entertaining or helpful.
Bob . . .
Message 14
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Subject: | Re: To ground loop . . . or not, that IS the question. |
At 08:42 AM 11/24/2006 -0500, you wrote:
>In a message dated 11/23/2006 10:31:05 PM Eastern Standard Time,
>nuckollsr@cox.net writes:
>"There is no such
> thing as a DC system." Even a battery generates some
> "wiggles" in output voltage as electrons within the chemistry
> jump from ion to ion.
>
>===========================================
>Hi Bob:
>
>I do live on my own planet, but unfortunately I have to share it; I would
>even accept a planetoid.
>
>GREAT statement above Bob. That is what I learned also. We must have
>read the same books at one time or another.
Then you agree with Eric's assertion that once a DC
system "wiggles" that it has now morphed into an AC
system?
>
>But, why in your GROUND explaination/seranio (your post explaining ground
>loops) did you pick thermocouples and group them under the DC Ground
>umbrella?
>If you recall thermocouples when first produced were done so as a floating
>(non-grounded) device. And in many cases as a non-shieled device. This
>led to may erroneous reading on the gages ESPECIALLY when digital
>read-outs with low voltage sensing circuits came into play. So the method
>of correcting and stabilizing became a GROUNDED thermocouple.
Yup, you do live on a different planet. I've never had to
shield a thermocouple. Digital instruments intended to
read thermocouple voltages came with specifications as
to what kind and amount of common mode voltages they would
tolerate. I've worked with all of them. If one understands
the performance and limits of the hardware at hand, one
may expect reliable results.
So, assuming you're using equipment that is NOT tolerant
of whatever common mode noises are present and assuming further
that you DO ground the thermocouple at the sense end and
your measurement equipment is also grounded at some other
point in the system, then yes . . . one should not be surprised
that the GROUND LOOP so generated produces poor results.
> But, in this case you are talking Fruit Salad ... You know ... Apples &
> Oranges. They are close, but throwing them into the same bowl, I feel
> does not truly explain the issue. I think it is only confusing to many
> out there. Too much Tech-Know-Babble, sounding too much like Professor
> Irwin Cory.
Okay, how about use of remote sensing in power generation
control systems . . . or the case I cited where we fixed
an instrumentation interference problem by making eliminating
a ground loop in the airplane's DC power sysrem?
>The topic is DC GROUNDS. And you know me I keep things SIMPLE ...
>K.I.S.S. M.E. SIMPLE.
>And for those that just might still be interested in the basics and how to
>eliminate about 98% of your electronical issues and NOISE issues here is
>the short version of the basics:
>GROUND at the SOURCE (Alternators, Batteries, Avionics and the like).
>CLEAN YOUR GROUNDS
>ADD MORE GROUNDS to DC Circuits - Battery to Engine, Battery to Firewall,
>Firewall (after additional grounds have been added) to Panel and YES I
>strongly believe in a nice heavy gage Ground Terminal Block. Or at least
>a Brass Nut & Bolt.
>[I believe my above statement is what started this debate - MORE Grounds
>do HELP]
No, you said:
"There is NO SUCH FREEKEN thing as a GROUND LOOP in a DC circuit."
>AC Circuits Ground at BOTH ENDS
>AF (Audio Frequencies) Ground ONLY at the Source
>RF (Radio Frequencies) Ground at BOTH ends
>Crazy thing here ... Alternators produce BOTH AF & RF, so what do you
>do? GROUND at BOTH Ends. YES! GROUND!
>After you do the grounding THEN you can start playing with Inductors &
>Capacitors and Transient Suppressors.
>
>This is the short list. I very seldom need to do more than that to prevent
>or remove a problem.
Now that's an illuminating dissertation. If it's "babble"
one is striving for, you've achieved it. I'm sure every new
builder on the List now knows exactly what you're describing but
the fact that you're finding issue with my words suggests that
that chapters on grounding, noise combined with architecture drawings
in appendix Z in the 'Connection are are now in doubt. Barry, I just don't
have the time or energy to discuss this with you. If you have
a goal of being helpful, it's just not coming through.
Tell you what. Write up a critical review of the work you find
in the 'Connection. Be specific. Use clear words and syntax that
brings to light anything I've written that leads anyone astray. If you
want to be a teacher in this venue, you'll have to act like one.
Ship me the document and I'll publish it on the website.
Here's an example of the format:
http://aeroelectric.com/articles/rules/review.html
You've demeaned my honor and my intelligence. Now back it
up with simple-ideas and illuminating anecdotes from your
experience. But if all you're going to do is sit on the
edge and throw in mud balls, then go away. You're not
entertaining or helpful.
Bob . . .
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Subject: | Re: Z-19 questions |
At 12:50 PM 11/24/2006 +0000, you wrote:
>Is this what our friendly discussion group has come to
>
>John
You're a day late and a dollar short my friend. This VERY
friendly discussion group has not "come to anything"
as a result of the note you've cited. Furthermore,
the whole matter was put to rest hours ago.
Bob . . .
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At 07:05 AM 11/24/2006 -0500, you wrote:
>
>Bob,
>
>Thank you for publishing your most welcomed letter of forgiveness. It means
>a lot to me, especially coming from a man whom I admire in many ways. You
>don't know me well, because I am a recent newcomer (within a year) and
>mostly lurker. I am not in the wire system planning phase of my homebuilt
>project yet, so I choose to stay mostly quiet until I stick my foot in my
>mouth. :)
You are not alone sir. Matt tells me there are over 1300
folks subscribed to this list and obviously, the vast majority
must find value in watching the conversations go by else they
would simply unsubscribe.
Be silent or participate as the need suits you but please
don't hesitate to jump in for clarification or expansion
of an idea that seems to have relevance to your plans
or understanding.
>I do have one favor to ask of you before I go. Since my original email as
>well as two respondents' emails have both the offensive language AND my
>business information in the salutation, may I ask of you to go into whatever
>mechanism you have to un-archive them? It reflects badly on my associated
>partner company, Xilinx, and un-archiving would be greatly appreciated here.
>If I have to do something extra myself to solve this problem, then please
>let me know.
You would have to contact Matt Dralle about that.
He holds the "keys to the system" as it were. No
doubt there is a way to get into the files and
work on them.
>Thank you so much and have a nice Thanksgiving season.
. . . and you too sir!
Bob . . .
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Subject: | Re: Pitot heater - current sensor |
At 09:38 AM 11/24/2006 -0600, you wrote:
>Bob,
>
>Say - I noticed diagram PitotHeat.pdf on your website...
>
>This seems like a slick low cost way to know if your pitot heater is
>actually drawing current.
>
>Could I also use this for a fuel boost pump?
>
>Do you have a picture of a finished unit and how you would wrap the wire
>around it, heat shrink, etc?
>
>Thanks,
>
>John
I've not published any specifics on utilizing reed-switches
as current sensors. They're used in MANY similar applications
on our production airplanes. Light ON says system IS powered
and IS drawing current.
Reed switches come in lots of sizes and sensitivities.
Get a 275-232 reed relay from Radio Shack. Remove
existing excitation coil and rewind with 22AWG for up
to 10A circuit and 16AWG for up to 20A circuit. Find
minimum number of turns that will close the relay contacts
when your electro-whizzie is powered at about 10 volts
(end of battery life).
http://www.aeroelectric.com/Pictures/Misc/CurrentSense.jpg
http://www.aeroelectric.com/PPS/DeIce/Pitot_Heat.pdf
I've considered packaging calibrated current sensors
either with reed switches or perhaps more sophisticated
electronics . . . but the reeds are simple, inexpensive
and reasonably rugged after installation. You'll need
to be gentle on these things while working with them.
After the design is fixed, consider "potting" the
werks in hot-glue.
For individual loose reed capsules check out
http://tinyurl.com/yfb3rf
http://mpja.com/productview.asp?product=7459+SW
http://www.goldmine-elec-products.com/prodinfo.asp?number=G13078
http://www.goldmine-elec-products.com/prodinfo.asp?number=G13997
http://www.goldmine-elec-products.com/prodinfo.asp?number=GP57
It takes some experimentation but the simple-ideas that
support the invention are sound. We've been doing this
in GA aircraft for decades.
Bob . . .
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