Today's Message Index:
----------------------
1. 06:14 AM - Re: Compatable Shunt (eschlanser)
2. 07:49 AM - Re: Re: Compatable Shunt (Robert L. Nuckolls, III)
3. 02:50 PM - Adding a cell phone interface to Garmin 340 (Rob Henderson)
4. 03:36 PM - Re: Re: Compatable Shunt (fedico94@mchsi.com)
5. 04:36 PM - Re: Re: Compatable Shunt (Robert L. Nuckolls, III)
6. 06:28 PM - Re: Re: Compatable Shunt (Robert L. Nuckolls, III)
7. 08:06 PM - Re: Re: Compatable Shunt (fedico94@mchsi.com)
8. 08:56 PM - Re: Re: Compatable Shunt (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Compatable Shunt |
Walter,
If you are really enjoying it, then don't unsubscribe. Rather, change your setting
to receive a daily digest rather than individual e-mail messages. That way
you will receive only one message per day.
Eric
cwjazun(at)aol.com wrote:
> Hello Bob,
>
> Got the book, good job, I'm really enjoying it.
>
> Quick question, how do I un-suscribe from the forum??? I get about 30 emails
an hour! hard to keep up with it.
>
> Thanks
>
> Regards
>
> Walter
>
>
>
>
>
>
> --
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384551#384551
Message 2
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| Subject: | Re: Compatable Shunt |
At 09:05 PM 10/2/2012, you wrote:
With the 80 pin (read delicate) connector I am reluctant to pull
it. The information I have from Garmin implies that the G3X will not
read unless it has 5 milliohm resister (rather than 8.3)
Job one is to test fly with voltmeter. andswap out the shunt in the
next few weeks. will recheck wiring tomorrow
The readout has a red "X" through it meaning inoperable, no scale is displayed
Aha! Then the difficulty is not with the size of
the shunt. Shunt size has only to do with scale
factor . . . calibration.
Substitution of a 60A vs. 100A shunt without
re-calibrating the instrument means only that
readings displayed will be 1.66 times higher
than true.
The fact that your display does not show a
numerical value suggests that something in
the software has detected an error in wiring
or in setup. The instrument has no way to
deduce shunt size, only that a shunt appears
to be present. This strongly suggests a
wiring problem.
You can leave the 60A shunt in place and
re-calibrate per instructions . . . or swap
out for the 100A shunt where the instrument
will probably read correctly . . . AFTER
the big red X goes away.
Bob . . .
Message 3
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| Subject: | Adding a cell phone interface to Garmin 340 |
Hello electron herder experts
Has anyone wired an external cell phone interface to a Garmin GMA340?
I would like to use a 3.5mm jack and cord.
Would it work to wire it as Com 3?
Any suggestions are appreciated
Thanks
-Rob Henderson
Message 4
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| Subject: | Re: Compatable Shunt |
SUPRISE Bob
A fellow EAA'r came out and we easily swapped out the 50mc 60amp shunt for the
Garmin provided 50mv/100amp shunt and connected the wires back up as they were
previously. Turned on master switch and the Garmin screens came up. Went to
engine page on MFD screen and would you believe that the red "X" was gone and
it was reading amp draw. Later I will do same for EBus shunt.
It appears with Garmin its their way or the highway. You would think it would
read with just any old shunt in there, but as I was advised by Tim Larberg at
Garmin, that is not the case.
----- Original Message -----
From: Robert L. Nuckolls, III <nuckolls.bob@aeroelectric.com>
Sent: Wed, 3 Oct 2012 09:48:44 -0500 (CDT)
Subject: Re: AeroElectric-List: Re: Compatable Shunt
At 09:05 PM 10/2/2012, you wrote:
With the 80 pin (read delicate) connector I am reluctant to pull
it. The information I have from Garmin implies that the G3X will not
read unless it has 5 milliohm resister (rather than 8.3)
Job one is to test fly with voltmeter. andswap out the shunt in the
next few weeks. will recheck wiring tomorrow
The readout has a red "X" through it meaning inoperable, no scale is displayed
Aha! Then the difficulty is not with the size of
the shunt. Shunt size has only to do with scale
factor . . . calibration.
Substitution of a 60A vs. 100A shunt without
re-calibrating the instrument means only that
readings displayed will be 1.66 times higher
than true.
The fact that your display does not show a
numerical value suggests that something in
the software has detected an error in wiring
or in setup. The instrument has no way to
deduce shunt size, only that a shunt appears
to be present. This strongly suggests a
wiring problem.
You can leave the 60A shunt in place and
re-calibrate per instructions . . . or swap
out for the 100A shunt where the instrument
will probably read correctly . . . AFTER
the big red X goes away.
Bob . . .
Message 5
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| Subject: | Re: Compatable Shunt |
At 05:35 PM 10/3/2012, you wrote:
SUPRISE Bob
A fellow EAA'r came out and we easily swapped out the 50mc 60amp
shunt for the Garmin provided 50mv/100amp shunt and connected the
wires back up as they were previously. Turned on master switch and
the Garmin screens came up. Went to engine page on MFD screen and
would you believe that the red "X" was gone and it was reading amp
draw. Later I will do same for EBus shunt.
It appears with Garmin its their way or the highway. You would think
it would read with just any old shunt in there, but as I was advised
by Tim Larberg at Garmin, that is not the case.
That's more than a surprise, it's a mind bender . . .
I would REALLY like to understand the intelligence
built into the system for making that determination.
Low resistance measurements are not easy to do
even when you can attach 4-wires directly to the
shunt . . .
http://tinyurl.com/4l3tuj6
. . . looking at a .0005 ohm resistor on the
end of lead wires several feet long having a
resistance of 0.010 to 0.015 ohms PER foot
is magic.
I may have occasion to enjoy some face-time with
a Garmin techno-wienie next summer. I'll put this
on my list of questions to ask.
In any case, I'm delighted that your problem has
been resolved . . . even if we don't understand
just how it all came to pass. Must be pixie dust.
Bob . . .
Message 6
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| Subject: | Re: Compatable Shunt |
>
>It appears with Garmin its their way or the highway. You would
>think it would read with just any old shunt in there, but as I was
>advised by Tim Larberg at Garmin, that is not the case.
Do you have a phone number for Mr. Larberg. I'd
like to talk to him.
Bob . . .
Message 7
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| Subject: | Re: Compatable Shunt |
Hope this is not a serious discussion. Garmin has their own way of setting up
the software and when I install the next shunt for the auxillary alternator, if
the red "X" is gone then I will be two for two. Tim Larberg 1-888- 606-5482
press 3 for the first phone prompt and then press 3 for the second phone prompt
(G series glass panels)
----- Original Message -----
From: Robert L. Nuckolls, III <nuckolls.bob@aeroelectric.com>
Sent: Wed, 3 Oct 2012 20:26:15 -0500 (CDT)
Subject: Re: AeroElectric-List: Re: Compatable Shunt
>
>It appears with Garmin its their way or the highway. You would
>think it would read with just any old shunt in there, but as I was
>advised by Tim Larberg at Garmin, that is not the case.
Do you have a phone number for Mr. Larberg. I'd
like to talk to him.
Bob . . .
Message 8
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| Subject: | Re: Compatable Shunt |
At 10:04 PM 10/3/2012, you wrote:
>
>Hope this is not a serious discussion. Garmin has their own way of
>setting up the software and when I install the next shunt for the
>auxillary alternator, if the red "X" is gone then I will be two for
>two. Tim Larberg 1-888- 606-5482 press 3 for the first phone
>prompt and then press 3 for the second phone prompt (G series glass panels)
Nothing tense. Just one techno wienie talking to another
one. It behooves suppliers of any product to spread the
knowledge around. Cuts down on calls to field service.
An amazed and inquiring mind just wants to know . . .
Bob . . .
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