Today's Message Index:
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1. 04:59 AM - Re: Current limiter and/or Circuit breaker for alternator (Ken)
2. 05:40 AM - Re: Current limiter and/or Circuit breaker for alternator (Grant Neilson)
3. 05:42 AM - Off line for a few days . . . (Robert L. Nuckolls, III)
4. 10:07 AM - Have You Tried The New Matronics List Forum? (Matt Dralle)
5. 10:40 AM - comic book (Carlos Trigo)
6. 11:43 AM - Re: comic book (Terry Watson)
7. 11:56 AM - Re: comic book (Glaeser, Dennis A)
8. 02:19 PM - Re: comic book (Dave N6030X)
9. 10:35 PM - Garmin 396 Ground Loop (Pete Howell)
Message 1
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Subject: | Re: Current limiter and/or Circuit breaker for alternator |
--> AeroElectric-List message posted by: Ken <klehman@albedo.net>
Further explanation if required would be that yes an ANL is a slow
acting fuse and it is equivalent to a breaker. Certainly there is
nothing immediately wrong with having multiple devices in a circuit.
However both these devices add very small amounts of resistance to the
circuit as does the connections to them. Additional resistance could
lead to less voltage stability with some regulators, and more
maintanance as the system ages. In some cases you may also have a
battery contactor and an overvoltage contactor in that B-lead circuit.
The general idea is to keep the B-lead short and not run extra length up
to the instrument panel and then back to a battery. However a B-lead
breaker does not have to be on the panel and does not have to be
resettable in flight. Certainly an ANL would not be replaced in flight,
nor would you want to. Another reason to keep B-leads short is that they
tend to radiate some noise.
Since the ANL is protecting the B-lead from excess battery supplied
current, it makes sense to keep it close to the battery. As Bob has
expained on several occasions, contrary to first look, the purpose of
the ANL is definately not to protect anything from excess alternator
current.
.
Ken
Robert L. Nuckolls, III wrote:
> --> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
> <nuckollsr@cox.net>
>
> At 04:40 PM 11/2/2006 -0800, you wrote:
>
>> If I install a current limiter, say an ANL80, should I still also
>> install a conventional 60 or 70 amp circuit breaker in the alternator
>> output? Or is that an unnecessary redundancy? If it's not necessary,
>> is there any down side to having both, other than the additional
>> minimal weight and cost?
>> Thanks for any input.
>
>
> The whole idea behind the ANL is to get the alternator
> b-lead out of the cockpit . . . and if it's out of the
> cockpit, then ANL or equivalent devices for circuit
> protection are called for. Breakers under the cowl
> don't make much sense.
>
> Bob . . .
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Message 2
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Subject: | Re: Current limiter and/or Circuit breaker for alternator |
So the external shunt for my ammeter is also perfectly happy being under the
cowl, with the leads to the instrument penetrating the firewall?
Message 3
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Subject: | Off line for a few days . . . |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
Dr. Dee and I are packing the car to head off to Bloomington,
IL for a weekend seminar. Be back on Monday.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
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Message 4
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Subject: | Have You Tried The New Matronics List Forum? |
--> AeroElectric-List message posted by: Matt Dralle <dralle@matronics.com>
Hello Listers,
One of the major new additions to the Matronics Email Lists this year was the addition
of a new and full function Forum Web Site at:
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The best part of these new Forums is that they are tied directly to the Classic
email distribution Lists! That also means that posts go in both directions.
If you post a message on the Forum web site, it will be cross posted to the respective
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it will be cross posted to the same respective forum on the Forum site!
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Thank you!!
Matt Dralle
Matronics Email List Administrator
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Message 5
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--> AeroElectric-List message posted by: "Carlos Trigo" <trigo@mail.telepac.pt>
> BNC connectors. I featured this adapter in the comic
> book
Just to enrich my English language knowledge, what exactly do you mean by
"Comic Book" ?
Carlos Trigo
Portugal
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Message 6
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--> AeroElectric-List message posted by: "Terry Watson" <terry@tcwatson.com>
Carlos,
I think Bob is off for the weekend, so I will give it a shot. "Comic book",
in the sense that Bob is using it, is an annotated series of pictures,
usually to show how to do something.
Terry
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Carlos
Trigo
Sent: Friday, November 03, 2006 10:40 AM
Subject: AeroElectric-List: comic book
--> AeroElectric-List message posted by: "Carlos Trigo"
<trigo@mail.telepac.pt>
> BNC connectors. I featured this adapter in the comic
> book
Just to enrich my English language knowledge, what exactly do you mean by
"Comic Book" ?
Carlos Trigo
Portugal
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Message 7
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--> AeroElectric-List message posted by: "Glaeser, Dennis A" <dennis.glaeser@eds.com>
Carlos,
This is a term Bob uses for his How-To articles, which are basically
pictures with text added as required for explanation. He'll have to
explain why he chose that particular term, but it probably dates back to
pre-digital picture days when the 'pictures' were hand sketches and the
text was hand written - and that is similar to the format of comic books
we (who have more than a few grey hairs) grew up with as kids.
Dennis Glaeser
--> AeroElectric-List message posted by: "Carlos Trigo"
> BNC connectors. I featured this adapter in the comic
> book
Just to enrich my English language knowledge, what exactly do you mean
by
"Comic Book" ?
Carlos Trigo
Portugal
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Message 8
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--> AeroElectric-List message posted by: Dave N6030X <N6030X@DaveMorris.com>
Carlos, think of the "Asterisk and Obelisk" comic book series in France.
Dave Morris
At 12:40 PM 11/3/2006, you wrote:
>--> AeroElectric-List message posted by: "Carlos Trigo"
><trigo@mail.telepac.pt>
>
>> BNC connectors. I featured this adapter in the comic
>> book
>
>Just to enrich my English language knowledge, what exactly do you
>mean by "Comic Book" ?
>
>Carlos Trigo
>Portugal
>
>
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Message 9
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Subject: | Garmin 396 Ground Loop |
--> AeroElectric-List message posted by: "Pete Howell" <pete.howell@gecko-group.com>
hello,
I just added a Garmin 396 to my RV-9A. I have the audio output connected to
my stereo intercom aux inputs along with a traffic monitor and engine
monitor (with isolation resisitors). When I have the 396 powered through
the airplane, I get audio noise. If I run it on battery, the noise goes
away. I'm thinking ground loop. The 396 power ground goes to the main
ground block on the firewall. The audio grounds go to an avionics ground
bus at the back of the intercom that is ultimately wired to the main ground
block.
Any thoughts? I won't mess with this too long before I will try an inline
ground loop isolator like this one:
http://www.discountcarstereo.com/detail.aspx?ID=970
Thanks,
Pete
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