---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 06/14/14: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:59 AM - Direction Indicator Needs (Summary) (Owen Baker) 2. 07:07 AM - Re: Mag switch through d-sub connector (Robert L. Nuckolls, III) 3. 11:28 AM - Re: Mag switch through d-sub connector (donjohnston) 4. 12:44 PM - Re: Re: Mag switch through d-sub connector (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 05:59:15 AM PST US From: "Owen Baker " Subject: AeroElectric-List: Direction Indicator Needs (Summary) 6/14/2014 Hello Ken, Thanks for your response. 1) I had written: =9CI can not find that information on the MGL web site. Can you please help me find it?=9D And that is exactly what you did when you wrote: 2) =9CIf you look in the manual http://www.mglavionics.com/AV2.pdf on page 10 you will see the definitions of the 2-D, 3D-A, and 3D-G choices or operating modes.=9D and =9DI discounted purchasing the stand alone $500. magnetic heading system for these reasons.=9D 3) I agree completely with your analysis and greatly appreciate your input. If I want the degree of stabilization that I interpret that 14 CFR 91.205 (d) (9) =9CGyroscopic direction indicator (directional gyro or equivalent)" intends then I must purchase: a) The AV-2 AHRS Display (VELOCITY Series), b) Both the SP-6 and SP-7 Sensors (Full AHRS), c) And, if I intend to mount the two sensors in the same location, an SP-2 / SP-4 Connector. d) For a total cost of USD $1305 plus shipping. This increased cost over my earlier posted solution of using just the display and the SP-6 sensor causes me to reconsider the potential solutions to my problem, but I can not yet rule out the MGL solution because of the additional expense. (An addict will go to some extreme lengths to feed his addiction.) Thanks again for your inputs and I continue to welcome any inputs that others may have. OC 'O C' Baker says "The best investment you can make is the effort to gather and understand information." == Time: 02:49:26 PM PST US From: Ken Subject: Re: Avionics-List: Direction Indicator Needs (Summary) Hi Owen I agree that gps track does not equate to a gyro compass. If you look in the manual http://www.mglavionics.com/AV2.pdf on page 10 you will see the definitions of the 2-D, 3D-A, and 3D-G choices or operating modes. The disadvantages column says "Cannot correctly compensate for tilt during any form of turn due to centrifugal forces acting on the accelerometers" That is for the 3D-A mode which is what you get with the SP6 as far as I can tell. The disadvantage column for the 3D-G (the best mode of operation with a full AHRS) says "Can show very large errors if the horizon information is invalid which could have a number of causes such as exceeding operational limitations of the horizon system." I interpret this to mean that you are back to the 3D-A mode if the attitude info is not available. This is the same results I found in my little experiments with a 3D magnetic sensor. The results were only useable when flying straight and level. I'd expect much better results near the equator of course. Again I have no experience with the MGL products but lacking actual performance reports, I discounted purchasing the stand alone $500. magnetic heading system for these reasons. Ken ________________________________ Message 2 _____________________________________ Time: 07:07:27 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Mag switch through d-sub connector At 03:19 PM 6/13/2014, you wrote: > >I'm trying to clean up the connections to a switch panel that has >the mag switches. Is a D-sub connector appropriate for mag switch connections? Are you intending to run p-leads through a connector with other system wires? I presume that you're wanting to 'unplug' all wires from a panel so that it can be easily removed . . . This practice is generally discouraged from the simple perspective of complexity driven drop in reliability . . . every connector adds three new joints to every wire. The more sanitary practice is to make your wire bundle to the panel of sufficient length that it can be removed and supported in some way that allows access but without breaking the bundle. If you do decide to put connectors in the p-leads, run them through their own separate connector and bring the shields through the connector on their own pins. Bob . . . ________________________________ Message 3 _____________________________________ Time: 11:28:49 AM PST US Subject: AeroElectric-List: Re: Mag switch through d-sub connector From: "donjohnston" nuckolls.bob(at)aeroelect wrote: > At 03:19 PM 6/13/2014, you wrote: > > > > > > > I'm trying to clean up the connections to a switch panel that has > > the mag switches. Is a D-sub connector appropriate for mag switch connections? > > > > > > Are you intending to run p-leads through a > connector with other system wires? I presume > that you're wanting to 'unplug' all wires > from a panel so that it can be easily removed . . . > This practice is generally discouraged from > the simple perspective of complexity driven > drop in reliability . . . every connector adds > three new joints to every wire. > In this case, the switches that I'm using have solder lugs so there's already three joints. I'm currently using faston and spade connectors for each wire. I was simply trying to consolidate the connections to a single DB-25 connector. > > The more sanitary practice is to make your > wire bundle to the panel of sufficient length > that it can be removed and supported in some > way that allows access but without breaking > the bundle. That's what I'm doing now. But identifying each wire and mating it can be really tedious especially considering the location. > > If you do decide to put connectors in the > p-leads, run them through their own separate > connector and bring the shields through the > connector on their own pins. I can certainly do that. I just didn't know if the mags should be physically segregated to a different connector. Bob . . .[/quote] Read this topic online here: http://forums.matronics.com/viewtopic.php?p=424831#424831 ________________________________ Message 4 _____________________________________ Time: 12:44:41 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Mag switch through d-sub connector > >That's what I'm doing now. But identifying each wire and mating it >can be really tedious especially considering the location.\ Odds are that you can bundle the mag-wires in with other, low victim-potential wires, with no difficulty. Taking them through a connector doesn't add significant risk . . . the wires get pre-flight tested. Good compromise is run them through their own connector. 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.