---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 07/05/10: 13 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:37 AM - newbie (michael harris) 2. 06:49 AM - Re: Ground Power and Aux Alt sharing OVM? (Robert L. Nuckolls, III) 3. 07:07 AM - Re: newbie (Robert L. Nuckolls, III) 4. 07:07 AM - Re: AEC-9011 (Robert L. Nuckolls, III) 5. 10:01 AM - Headset and mic shield question (rparigoris) 6. 11:09 AM - Re: Headset and mic shield question (Robert L. Nuckolls, III) 7. 12:12 PM - Re: AEC-9011 (Robert Dufresne) 8. 12:41 PM - Re: AEC-9011 (Robert L. Nuckolls, III) 9. 01:07 PM - Microphone levels (B Tomm) 10. 01:22 PM - Re: Headset and mic shield question (rparigoris) 11. 03:30 PM - Re: Microphone levels (Robert L. Nuckolls, III) 12. 09:25 PM - stray RF (James Robinson) 13. 09:46 PM - Re: Microphone levels (B Tomm) ________________________________ Message 1 _____________________________________ Time: 06:37:25 AM PST US From: "michael harris" Subject: AeroElectric-List: newbie greetings all, I just finished reading the aero connection wow! THANK YOU BOB for all your efforts, although extremely informative it opens up a whole new list of questions, and before I ask those questions I wanted to be sure iam posting them in the right place. ________________________________ Message 2 _____________________________________ Time: 06:49:37 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Ground Power and Aux Alt sharing OVM? At 12:49 PM 6/28/2010, you wrote: > >I'm using Z13 in conjunction with Z31-B. Is there anything wrong >about the aux alternator and the ground power jack sharing the same >OVM? The only condition that I can think of where both systems would >be in use simultaneously is a ground powered START on the aux >alternator and that may not even be an issue unless the OVM tripped. >The issue being what caused it, the GPU or the aux alt. > >If this passes group muster, how would I wire it? Can't think of a practical way to do it. Bob . . . ________________________________ Message 3 _____________________________________ Time: 07:07:30 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: newbie At 08:25 AM 7/5/2010, you wrote: >greetings all, > I just finished reading the aero connection wow! THANK YOU BOB > for all your efforts, although extremely informative it opens up a > whole new list of questions, and before I ask those questions I > wanted to be sure iam posting them in the right place. Absolutely. The AeroElectric-List is a community supported classroom where the only expectations for participation are a civil demeanor and a quest for improving upon the best we know how to do. There are about 1800 folk who find value in watching what transpires here on the List. The sum total of personal experience of implementing recipes for success by our participants must be measured in centuries. I attended a family gathering in Denver this past weekend. One of the topics of discussion amongst those of us once or presently employed in the technical professions was the steady decline of technical expertise and skill in virtually every institution of which any had personal experience. For all the ISO, EPA, OSHA, FAA, etc. etc. directives for success, virtually no such institutions seemed aware of the means by which tribal knowledge is passed to those who follow. Until we can do the Vulcan mind-meld and pass all understanding by mere touch, one-on-one mentorship will have to suffice . . . and it has . . . for thousands of years. You are indeed in the right place my friend. Welcome aboard! Bob . . . ________________________________ Message 4 _____________________________________ Time: 07:07:34 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: AEC-9011 At 12:23 PM 7/4/2010, you wrote: >Bob; > >On page 4 of the document found here >http://www.aeroelectric.com/Catalog/AEC/9011/9011-700-1C.pdf >at bottom of the page, the connections are shown for the various >pins in the D9P connector. Pin 6 is used twice. Typo I would >imagine?? Same issue in this drawing >http://www.aeroelectric.com/Catalog/AEC/9011/9011_PM_OV-LV.pdf > > >Bob McC Yes, those are preliminary documents and I appreciate the heads-up. Bob . . . ________________________________ Message 5 _____________________________________ Time: 10:01:27 AM PST US Subject: AeroElectric-List: Headset and mic shield question From: "rparigoris" My 2 place Europa has a PS audio panel. I need to route shielded headset and mic wires out the port side of instrument module through a D-sub connector. Curiosity question, what would happen if the shields were connected at the D-sub? Thx. Ron Parigoris Read this topic online here: http://forums.matronics.com/viewtopic.php?p=303808#303808 ________________________________ Message 6 _____________________________________ Time: 11:09:48 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Headset and mic shield question At 11:55 AM 7/5/2010, you wrote: > > >My 2 place Europa has a PS audio panel. I need to route shielded >headset and mic wires out the port side of instrument module through >a D-sub connector. > >Curiosity question, what would happen if the shields were connected >at the D-sub? What does the PS installation instructions say about shielding? It should describe their recommendations for terminating the shields. Do they use the shields a part of the signal paths (i.e. grounds) or are they simply shields over an array of wires? It makes a difference and they should tell you exactly how to do it. For example, on page 1.10 of http://www.aeroelectric.com/Catalog/AEC/9009/9009-700L.pdf you can see examples of shield-only and shield-plus-signal connections for shielded wires. Bob . . . ________________________________ Message 7 _____________________________________ Time: 12:12:15 PM PST US From: Robert Dufresne Subject: RE: AeroElectric-List: AEC-9011 Hi, Where can I find the meaning of the symbols 3, P2, A1, S8, K10, 5, L4, L6, 7 in hexagonal boxes on page 4 of document 9011-700-1C.pdf. Robert D. De : owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] De la part de Robert L. Nuckolls, III Envoy=E9 : 5 juillet 2010 10:04 =C0 : aeroelectric-list@matronics.com Objet : Re: AeroElectric-List: AEC-9011 At 12:23 PM 7/4/2010, you wrote: Bob; On page 4 of the document found here http://www.aeroelectric.com/Catalog/AEC/9011/9011-700-1C.pdf at bottom of the page, the connections are shown for the various pins in the D9P connector. Pin 6 is used twice. Typo I would imagine?? Same issue in this drawing http://www.aeroelectric.com/Catalog/AEC/9011/9011_PM_OV-LV.pdf Bob McC Yes, those are preliminary documents and I appreciate the heads-up. Bob . . . ________________________________ Message 8 _____________________________________ Time: 12:41:10 PM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: AEC-9011 At 02:06 PM 7/5/2010, you wrote: >Hi, > >Where can I find the meaning of the symbols 3, P2, A1, S8, K10, 5, >L4, L6, 7 in hexagonal boxes on page 4 of document 9011-700-1C.pdf. > That's a preliminary document intended only to describe the spirit-and-intent of the new product. When the design is finalized, the document will be updated to look like this one http://www.aeroelectric.com/Catalog/AEC/9005/LV_Warn_Fab_and_Install.pdf where a spread-sheet of reference designators and the materials call-outs will be fully expanded like on page 3. Bob . . . ________________________________ Message 9 _____________________________________ Time: 01:07:35 PM PST US From: "B Tomm" Subject: AeroElectric-List: Microphone levels Bob, Would you expect that the microphone output level from a standard Aviation headset to be similar/ or even the same as a standard handheld audio microphone as used with a professional sound board? I don't own an audio meter but just need to be close for a non-aircraft related project. Bevan Rv7A Implementing Z13/8 ________________________________ Message 10 ____________________________________ Time: 01:22:09 PM PST US Subject: AeroElectric-List: Re: Headset and mic shield question From: "rparigoris" Hi Bob I have a PS Engineering PMA 4000. See: Page #21: http://www.ps-engineering.com/docs/PMA4000_IM.pdf Each 2 or 3 conductor cable has the shield connected to a different pin on the 25 pinb P1 Bottom Unit Connector. If pin 1, 2 , 6 and 7 were to touch each other at my D-sub connector, what trouble (if any) might that cause? Thx. Ron Parigoris Read this topic online here: http://forums.matronics.com/viewtopic.php?p=303825#303825 ________________________________ Message 11 ____________________________________ Time: 03:30:40 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Microphone levels At 03:04 PM 7/5/2010, you wrote: > > Bob, > >Would you expect that the microphone output level from a standard Aviation >headset to be similar/ or even the same as a standard handheld audio >microphone as used with a professional sound board? No. Aircraft microphones are victim to legacy compatibility standards that emulate the original carbon granule microphones (like those in telephones through the 70s). http://en.wikipedia.org/wiki/Carbon_microphone The audio output is not only very high (as much as 1 vrms) it is generated with a power supply delivered by the transmitter. Hence, most aircraft microphones have active electronics so that modern TINY voltage microphones can dress up like a carbon mic. > I don't own an audio >meter but just need to be close for a non-aircraft related project. Sound boards are generally set up to accept 100 mV pk-pk (30 mV rms) output from dynamic mics delivered on twisted pairs. Bob . . . ________________________________ Message 12 ____________________________________ Time: 09:25:55 PM PST US From: James Robinson Subject: AeroElectric-List: stray RF Hi Bob I have recently developed a problem when I transmit my VSI and other features on my Cheltons goes crazy. I have added a engine monitor EI MVP-50 recently. Is there a way to isolate the cause. This is a recent occurance No prior problem for 350 hrs James Robinson Glasair lll N79R Spanish Fork UT U77 ________________________________ ________________________________ Message 13 ____________________________________ Time: 09:46:44 PM PST US From: "B Tomm" Subject: RE: AeroElectric-List: Microphone levels Thanks Bob, exactly what I'm looking for. Bevan -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: Monday, July 05, 2010 3:26 PM Subject: Re: AeroElectric-List: Microphone levels --> At 03:04 PM 7/5/2010, you wrote: >--> > > Bob, > >Would you expect that the microphone output level from a standard >Aviation headset to be similar/ or even the same as a standard handheld >audio microphone as used with a professional sound board? No. Aircraft microphones are victim to legacy compatibility standards that emulate the original carbon granule microphones (like those in telephones through the 70s). http://en.wikipedia.org/wiki/Carbon_microphone The audio output is not only very high (as much as 1 vrms) it is generated with a power supply delivered by the transmitter. Hence, most aircraft microphones have active electronics so that modern TINY voltage microphones can dress up like a carbon mic. > I don't own an audio >meter but just need to be close for a non-aircraft related project. Sound boards are generally set up to accept 100 mV pk-pk (30 mV rms) output from dynamic mics delivered on twisted pairs. 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