---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 10/03/12: 8 ---------------------------------------------------------- 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 _____________________________________ Time: 06:14:20 AM PST US Subject: AeroElectric-List: Re: Compatable Shunt From: "eschlanser" 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 _____________________________________ Time: 07:49:59 AM PST US From: "Robert L. Nuckolls, III" 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 3 _____________________________________ Time: 02:50:39 PM PST US From: "Rob Henderson" Subject: AeroElectric-List: 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 _____________________________________ Time: 03:36:37 PM PST US From: fedico94@mchsi.com Subject: Re: AeroElectric-List: 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 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 _____________________________________ Time: 04:36:07 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 06:28:16 PM PST US From: "Robert L. Nuckolls, III" 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 7 _____________________________________ Time: 08:06:04 PM PST US From: fedico94@mchsi.com Subject: Re: AeroElectric-List: 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 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 _____________________________________ Time: 08:56:37 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.