---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 11/07/07: 22 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 12:18 AM - What Listers Are Saying... (Matt Dralle) 1. 06:57 AM - Re: TRIM Disconnect Switch (Eric M. Jones) 2. 07:05 AM - Re: TRIM Disconnect Switch (Hinde, Frank George (Corvallis)) 3. 07:14 AM - Batteries (Kevin Boddicker) 4. 08:20 AM - Re: TRIM Disconnect Switch (marcausman) 5. 08:29 AM - Garmin Power Requirements (George, Neal E Capt MIL USAF 605TES/TSI) 6. 08:56 AM - Re: Re: TRIM Disconnect Switch (Dan Morrow) 7. 09:08 AM - Re: [Probable SPAM] Re: TRIM Disconnect Switch () 8. 09:23 AM - Re: Garmin Power Requirements () 9. 09:36 AM - Re: Re: TRIM Disconnect Switch (Kenneth Melvin) 10. 10:07 AM - Re: 496 Audio--easy fix (Dave Saylor) 11. 01:18 PM - Re: Questions on Z-16 Diagram (vozzen) 12. 02:45 PM - Re: 496 Audio--easy fix (Fisher Paul A.) 13. 03:13 PM - CH701 Rotax 912 (John Swanson) 14. 03:26 PM - Re: 496 Audio--easy fix (Vernon Little) 15. 04:04 PM - Re: CH701 Rotax 912 (Robert L. Nuckolls, III) 16. 04:12 PM - Re: Re: TRIM Disconnect Switch (Robert L. Nuckolls, III) 17. 04:14 PM - Re: Re: Questions on Z-16 Diagram (Robert L. Nuckolls, III) 18. 05:25 PM - New product announcement (Robert L. Nuckolls, III) 19. 07:47 PM - Re:496 Audio--easy fix (Emrath) 20. 07:47 PM - Re:496 Audio--easy fix (Emrath) 21. 09:07 PM - Re: New product announcement (Jim Dabney) ________________________________ Message 0 _____________________________________ Time: 12:18:26 AM PST US From: Matt Dralle Subject: AeroElectric-List: What Listers Are Saying... November is Matronics List Fund Raiser month and a number people been sending some really nice comments regarding the Lists. I thought I'd share a few below. The Lists are completely supported by your Contributions. All of the bills for new hardware, connectivity, and electricity are paid by the generous support of the List members. Please make your Contribution today to support the continued operation of the List and Forums: http://www.matronics.com/contribution Thank you! Matt Dralle Matronics Email List Administrator ================= What Listers Are Saying ================ Flying and building is much safer with this List!! Robert D. Thanks for having and maintaining such a great resource to all of us builders and flyers. Wayne E. Love the fact that you haven't caved to advertising! Peter J. ..a great resource!! Robert C. Not building at the moment, but the Lists keeps me right up to date with what's going on. Chris D. The web forum has been running great. James O. I enjoy this [List] site very much... Paul C. This is a great list! Albert G. ..a valuable resource! Roger C. I am deployed to Pakistan right now, and being able to go on-line and keep up with the aircraft discussions helps keep the aircraft building dream alive in my mind! Gregory C. ..fantastic service! Roger M. ..clearly a work of passion! Mike C. It is a great service to us! Kevin C. The list is a wonderful resource... Ralph O. [The Lists] have been the single greatest resource in building my RV-9A and now my RV-10. Albert G. ..a valuable and always improving service. Dick S. STILL THE BEST BARGAIN AROUND!! Owen B. ..such a valuable tool. Jon M. [The Lists] have been an invaluable resource for me as a Zenith homebuilder. David G. The opportunity to meet (on line at least) many other interesting builders and to make some new friends is truly appreciated. Albert G. ________________________________ Message 1 _____________________________________ Time: 06:57:31 AM PST US Subject: AeroElectric-List: Re: TRIM Disconnect Switch From: "Eric M. Jones" Runaway trim....I agree with those who point out that the aircraft's maximum trim should still be flyable. But the problem still needs fixing. I would also like to point out that one should use environmentally-sealed switches for stick-grip trim switches. A sweaty hand on non-sealed switches leads to early failure. I have worked on a system that used the "watchdog" idea from computers where the trim system has to get a periodic signal from the controller, otherwise the trim actuator resets to some "safe" position. This is trivial to do. I have also sold plenty of my "True Servo Conversion for MAC/RAC". These seem to be a great way to make the MAC/RAC trim box work like the Cessna trim wheel. But recently I have doubted the utility of the elevator trim at all. Why bother? Well...so the pilot won't have to push on the stick constantly. This leads to fatigue. So how about putting a strain gauge on the elevator cable (perhaps near the trim box) and auto-trimming the elevator to remove the force on the stick? Easy to do, and one more pilot distraction eliminated. Anybody want a patent? "When the Oakies left Oklahoma and moved to California, it raised the I.Q. of both states." --Will Rogers -------- Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge, MA 01550 (508) 764-2072 emjones@charter.net Read this topic online here: http://forums.matronics.com/viewtopic.php?p=144404#144404 ________________________________ Message 2 _____________________________________ Time: 07:05:47 AM PST US Subject: RE: AeroElectric-List: TRIM Disconnect Switch From: "Hinde, Frank George (Corvallis)" And if you have a fast airplane like an RV or Glassair and the stick forces get too high then simply slow down. I certainly would not bother with another switch. Frank RV 7a ________________________________ From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert McCallum Sent: Tuesday, November 06, 2007 6:06 PM Subject: Re: AeroElectric-List: TRIM Disconnect Switch Trim runaway should hopefully be of minor concern for several reasons. 1; The likelihood of it happening is very low. (probably not worth worrying about) ________________________________ Message 3 _____________________________________ Time: 07:14:13 AM PST US From: Kevin Boddicker Subject: AeroElectric-List: Batteries Bob, A few weeks back someone on the list posted a url for some low priced AA and AAA cells. You asked him to send some to you for evaluation, if he made the purchase. I did indeed make that purchase. If the other lister has not send you any cells, I would be happy to. They are from Batteries dot com. 500 cells for $49.99 + $11.98 shipping. Thats 12.3 cents per cell delivered! The cells have a 12 2012 out date. I was concerned that they might be short dated for that price. If you would like to hook them up to your battery runner downer I please let me know, I will send some to you. Kevin Boddicker Tri Q 200 N7868B 77.9 hours Luana, IA. ________________________________ Message 4 _____________________________________ Time: 08:20:26 AM PST US Subject: AeroElectric-List: Re: TRIM Disconnect Switch From: "marcausman" The electric trim on my RV-7 is run by the Vertical Power system. The trim motors are controlled with solid-state switches - no mechanical relays. It provides runaway trim protection (stops the motor) by simply holding down the opposite trim switch, then after 3 seconds it disconnects the trim switches. You can then use the backup switches on the display to return the trim back to a neutral position. There is also a visual indicator when the trim is running, and soon audio as well. And it's all simpler to wire than a conventional system with mechanical relays. Of course it's part of a broader system - you can;t buy just the trim alone - but the whole point is to make overall wiring alot simpler. -------- Marc Ausman http://www.verticalpower.com RV-7 IO-390 Flying Read this topic online here: http://forums.matronics.com/viewtopic.php?p=144418#144418 ________________________________ Message 5 _____________________________________ Time: 08:29:27 AM PST US Subject: AeroElectric-List: Garmin Power Requirements From: "George, Neal E Capt MIL USAF 605TES/TSI" Listers - Do any of you have actual, measured current draws for Garmin radio equipment? Specifically, I'd like to see the "idling" receive-mode current draws for GNS-430, SL-30 and GTX-327. I'm not looking for recommended fuse ratings - I have those. I'm looking for "real," observed power requirements in an effort to properly assess my true alternator size requirement. Neal RV-7 N8ZG Gluing Canopy ________________________________ Message 6 _____________________________________ Time: 08:56:54 AM PST US From: "Dan Morrow" Subject: Re: AeroElectric-List: Re: TRIM Disconnect Switch >From my reading of aviation magazines, I gather the BIG airplanes often come with auto-trim systems. It's a good idea but probably already patented or covered by "prior art". ----- Original Message ----- From: "Eric M. Jones" Sent: Wednesday, November 07, 2007 6:53 AM Subject: AeroElectric-List: Re: TRIM Disconnect Switch > > Well...so the pilot won't have to push on the stick constantly. This leads > to fatigue. So how about putting a strain gauge on the elevator cable > (perhaps near the trim box) and auto-trimming the elevator to remove the > force on the stick? Easy to do, and one more pilot distraction eliminated. > Anybody want a patent? > ________________________________ Message 7 _____________________________________ Time: 09:08:28 AM PST US Subject: RE: [Probable SPAM] AeroElectric-List: Re: TRIM Disconnect Switch From: Another good reason to go Vertical. I will be doing the same thing. Remember the Ray Allen sticks operate on the principle of shorting out the connection to move the trim, so a short represents a signal to move. A dead short will also cause the servo to go nuts, so short prevention is the best design goal. A panic switch may be used to open the system completely. That could be on the panel with a big red button rather than using a spot on the stick. If the trim has already moved substantially before you hit the panic button, you need to fight it to the ground to land. Inconvenient, but not dangerous unless your load is imbalanced - pretty messy in the wind too. Once on the ground put a nut/bolt through the gap to guarantee it won't move on the way home. Another option for TruTrak users is to buy the automatic trim controller system which incorporates a fail-safe runaway feature. Somebody should design a feature that returns the servo to neutral when disconnect from power. Now there's an idea. -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of marcausman Sent: Wednesday, November 07, 2007 11:17 AM Subject: [Probable SPAM] AeroElectric-List: Re: TRIM Disconnect Switch --> The electric trim on my RV-7 is run by the Vertical Power system. The trim motors are controlled with solid-state switches - no mechanical relays. It provides runaway trim protection (stops the motor) by simply holding down the opposite trim switch, then after 3 seconds it disconnects the trim switches. You can then use the backup switches on the display to return the trim back to a neutral position. There is also a visual indicator when the trim is running, and soon audio as well. And it's all simpler to wire than a conventional system with mechanical relays. Of course it's part of a broader system - you can;t buy just the trim alone - but the whole point is to make overall wiring alot simpler. -------- Marc Ausman http://www.verticalpower.com RV-7 IO-390 Flying Read this topic online here: http://forums.matronics.com/viewtopic.php?p=144418#144418 ________________________________ Message 8 _____________________________________ Time: 09:23:01 AM PST US Subject: RE: AeroElectric-List: Garmin Power Requirements From: Vertical readily shows those values. Not sure if you're in a hurry ?? I am not quite setup, but I will make a note of those items when complete. Differences, I have a 530, sl30 and gtx330, but they should be similar. -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of George, Neal E Capt MIL USAF 605TES/TSI Sent: Wednesday, November 07, 2007 11:25 AM Subject: AeroElectric-List: Garmin Power Requirements Listers - Do any of you have actual, measured current draws for Garmin radio equipment? Specifically, I'd like to see the "idling" receive-mode current draws for GNS-430, SL-30 and GTX-327. I'm not looking for recommended fuse ratings - I have those. I'm looking for "real," observed power requirements in an effort to properly assess my true alternator size requirement. Neal RV-7 N8ZG Gluing Canopy ________________________________ Message 9 _____________________________________ Time: 09:36:49 AM PST US From: "Kenneth Melvin" Subject: RE: AeroElectric-List: Re: TRIM Disconnect Switch The Tru-Trak autopilots already offer such an auto-trim function. Works magnificently. Kenneth Melvin RV9A ________________________________ Message 10 ____________________________________ Time: 10:07:30 AM PST US From: "Dave Saylor" Subject: RE: AeroElectric-List: 496 Audio--easy fix You can run the XM volume up and down by tapping the power button and scrolling left/right. QUIT to exit. Not quite as easy as a knob but at least it's all there already. _____ From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of N81JG@aol.com Sent: Tuesday, November 06, 2007 5:52 PM Subject: Re: AeroElectric-List: 496 Audio--easy fix HI Dave, I just got my RV7A panel all together and the XM antenna working. When I turned on the XM, radio and intercom ( I don't have an audio panel since I have only an SL30) I had the XM come on at high volume. I then noted that there was no volume control for the XM other than the intercom or headset controls. The GPS warning came through clear. I guess I will have to place a potentiometer in the GPS 1/8" output line to control the XM volume. Does anyone know how and where I get the right pot to do the volume control? I decided when I wired the Flightcom intercom and set the dip switches I didn't want the music to mute each time the radio or intercom squelch was broken so I will have to keep the music volume toned down so I will not miss any reception or warning. Oh, I guess the warnings will be toned down with the music. I'll have to see how that works. Mainly I want to be able to control XM music volume independent of the radio. John Greaves RV7A nearing completion VariEze N81JG nearing replacement of overhauled engine Redding, CA _____ See what' ________________________________ Message 11 ____________________________________ Time: 01:18:22 PM PST US Subject: AeroElectric-List: Re: Questions on Z-16 Diagram From: "vozzen" >What problems have you deduced for wiring as suggested? None-- looks great. I was using the outdated Rev.K, which showed C-lead coming thru the OV trip breaker circuit, instead of direct from battery (via Master Sw). Thanks, Bob, for your continuing attention. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=144466#144466 ________________________________ Message 12 ____________________________________ Time: 02:45:56 PM PST US From: "Fisher Paul A." Subject: RE: AeroElectric-List: 496 Audio--easy fix Dave, Thank you for posting your solution. I had kept your original note because I intend to do the same thing you described. My intention was when I got closer I would contact you to see where you ended up. Now I'll just keep t his one! I'm glad to hear you got everything working. Your solution was certainly n ot intuitively obvious (meaning I would have never figured it out!). Thanks for being the pioneer! Paul A. Fisher RV-7A (still finishing!) ________________________________ From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectr ic-list-server@matronics.com] On Behalf Of Dave Saylor Sent: Tuesday, November 06, 2007 18:02 Subject: AeroElectric-List: 496 Audio--easy fix We have the audio working as desired from the 496. It turned out to be a v ery simple solution. To recount: It was my intention to have terrain warnings from a Garmin 496 wired to the unswitched audio input of a Garmin GMA340 audio panel. Garmin sells a "power/data cable" that provides wiring for audio output alo ng with serial data and 12VDC to power the GPS. The audio wires are labele d "voice+" and "voice-". Garmin also sells a similar cable that terminates in a speaker housed adjacent to a 12V plug for using in the car. I took t he speaker housing apart and confirmed that the voice+/- wires connected to the speaker. When we ran the voice wires into the audio panel, we got nothing. We tried several approaches, including running the audio into DME (nothing), ADF (n othing), though an audio transformer, though a potentiometer and through va rious simple resistors (zip, zero, nada). Just dead air from the 496. Finally, Jacek Kesy, who works at AirCrafters, discovered that when the "vo ice-" wire from the GPS was disconnected from the audio panel, everything w orked perfectly. Audio must be grounding somewhere else, and the wire that certainly seems like audio ground is actually "audio disable". Once the v oice- wire is grounded, you have to turn the 496 off and back on to get any audio. Here is how the final scenario is wired: 1/8" audio jack is wired to Music 1 on the audio panel. It outputs warning s and XM audio. Music 1 is muted by intercom activity or incoming transmis sions. As an aside, I also have a 1/8" audio jack wired through a toggle so I can select either XM or some other source for Music 1. But that has no bearing on the 496 audio problem. >From the 496 power/data cable, the "voice+" wire ties to a 220 ohm resistor , then to the unswitched audio input at the audio panel. The only other un switched audio input is from the EFIS. It also goes through a 220 ohm resi stor. Perhaps someone else can tell us what exactly the 220 ohm resistors do--my understanding is that they balance the two audio signals. I don't k now what would happen without them. So now, even though the warnings coming from Music 1 are at time muted, I a lways get the EFIS warnings and the terrain warnings, as long as the audio panel is on. There are a bunch of setup parameters for the 496 as well on the Sound page of the main menu. Those are all pretty intuitive and seem to mostly effec t the audio jack, not the output to the power/data cable. So that's it. Problem solved basically by trial and error, but it's workin g the way I want it to now. Dave Saylor AirCrafters LLC 140 Aviation Way Watsonville, CA 831-722-9141 831-750-0284 CL www.AirCraftersLLC.com ________________________________ Message 13 ____________________________________ Time: 03:13:58 PM PST US From: "John Swanson" Subject: AeroElectric-List: CH701 Rotax 912 Installing Rotax 912 into CH701. Trying to wire the switch to the Mags. How do i install the flat pin terminal to the shielded wire? What tool do i need? Thanks John seems as if the last 10% takes longer ________________________________ Message 14 ____________________________________ Time: 03:26:36 PM PST US From: "Vernon Little" Subject: RE: AeroElectric-List: 496 Audio--easy fix For anyone who knows: I wired my GPSMap 296 this way about 2 years ago using my Sigtronics SPA-400 intercom and the Vx-Aviation AMX-1A Audio Bus, hoping that Garmin would introduce voice warnings on the 296. The audio works fine: I get a voice alarm when power fails and a voice prompt when I change volume. I don't get any other voice warnings, however. I imagine the 496 and 296 share a lot of common code, so I would expect the 296 to have voice warnings as well. Has anyone been successful in getting voice warnings from the 296, or am I doomed to upgrade to a 496 to get this feature? Thanks, Vern Little -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Fisher Paul A. Sent: November 7, 2007 2:40 PM Subject: RE: AeroElectric-List: 496 Audio--easy fix Dave, Thank you for posting your solution. I had kept your original note because I intend to do the same thing you described. My intention was when I got closer I would contact you to see where you ended up. Now I'll just keep this one! I'm glad to hear you got everything working. Your solution was certainly not intuitively obvious (meaning I would have never figured it out!). Thanks for being the pioneer! Paul A. Fisher RV-7A (still finishing!) _____ From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave Saylor Sent: Tuesday, November 06, 2007 18:02 Subject: AeroElectric-List: 496 Audio--easy fix We have the audio working as desired from the 496. It turned out to be a very simple solution. To recount: It was my intention to have terrain warnings from a Garmin 496 wired to the unswitched audio input of a Garmin GMA340 audio panel. Garmin sells a "power/data cable" that provides wiring for audio output along with serial data and 12VDC to power the GPS. The audio wires are labeled "voice+" and "voice-". Garmin also sells a similar cable that terminates in a speaker housed adjacent to a 12V plug for using in the car. I took the speaker housing apart and confirmed that the voice+/- wires connected to the speaker. When we ran the voice wires into the audio panel, we got nothing. We tried several approaches, including running the audio into DME (nothing), ADF (nothing), though an audio transformer, though a potentiometer and through various simple resistors (zip, zero, nada). Just dead air from the 496. Finally, Jacek Kesy, who works at AirCrafters, discovered that when the "voice-" wire from the GPS was disconnected from the audio panel, everything worked perfectly. Audio must be grounding somewhere else, and the wire that certainly seems like audio ground is actually "audio disable". Once the voice- wire is grounded, you have to turn the 496 off and back on to get any audio. Here is how the final scenario is wired: 1/8" audio jack is wired to Music 1 on the audio panel. It outputs warnings and XM audio. Music 1 is muted by intercom activity or incoming transmissions. As an aside, I also have a 1/8" audio jack wired through a toggle so I can select either XM or some other source for Music 1. But that has no bearing on the 496 audio problem. >From the 496 power/data cable, the "voice+" wire ties to a 220 ohm resistor, then to the unswitched audio input at the audio panel. The only other unswitched audio input is from the EFIS. It also goes through a 220 ohm resistor. Perhaps someone else can tell us what exactly the 220 ohm resistors do--my understanding is that they balance the two audio signals. I don't know what would happen without them. So now, even though the warnings coming from Music 1 are at time muted, I always get the EFIS warnings and the terrain warnings, as long as the audio panel is on. There are a bunch of setup parameters for the 496 as well on the Sound page of the main menu. Those are all pretty intuitive and seem to mostly effect the audio jack, not the output to the power/data cable. So that's it. Problem solved basically by trial and error, but it's working the way I want it to now. Dave Saylor AirCrafters LLC 140 Aviation Way Watsonville, CA 831-722-9141 831-750-0284 CL www.AirCraftersLLC.com .matronics.com/contribution ist">http://www.matronics.com/Navigator?AeroElectric-List ics.com ________________________________ Message 15 ____________________________________ Time: 04:04:46 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: CH701 Rotax 912 At 06:04 PM 11/7/2007 -0500, you wrote: >Installing Rotax 912 into CH701. >Trying to wire the switch to the Mags. How do i install the flat pin terminal >to the shielded wire? >What tool do i need? I presume you're wrestling with the shield connection. No special tools needed. You need to convert the shield braid into wire like so: http://aeroelectric.com/articles/pigtail/pigtail.html Once both conductors at the end of your shielded wire are "plain wire", you can use the standard PIDG terminals and appropriate tool. Bob . . . ________________________________ Message 16 ____________________________________ Time: 04:12:43 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: TRIM Disconnect Switch > >But recently I have doubted the utility of the elevator trim at all. Why >bother? > >Well...so the pilot won't have to push on the stick constantly. This leads >to fatigue. So how about putting a strain gauge on the elevator cable >(perhaps near the trim box) and auto-trimming the elevator to remove the >force on the stick? Easy to do, and one more pilot distraction eliminated. >Anybody want a patent? Demonstrated this for Lear about 30 years ago. They had a flight test aircraft fitted with a pilot pitch effort strain gage. We closed the loop on stick force and used the servoed trim system I'd already certified. The pilot held an AUTO TRIM button on the stick. He would hand-fly to desired pitch condition and the trim system would be constantly driving to take force out of the stick. Worked great, marketing couldn't see enough demand to justify developing it into a product. But that was on Lears and 30 years ago, we're working a whole new market now. Bob . . . ________________________________ Message 17 ____________________________________ Time: 04:14:40 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Questions on Z-16 Diagram At 01:15 PM 11/7/2007 -0800, you wrote: > > >What problems have you deduced for wiring >as suggested? > >None-- looks great. I was using the outdated Rev.K, which showed C-lead >coming thru the OV trip breaker circuit, instead of direct from battery >(via Master Sw). > >Thanks, Bob, for your continuing attention. No problem . . . and I wasn't trying to challenge you on the 'modification' . . . I'm just trying to be sensitive to errors in my perceptions and evolution in new products. Bob . . . ________________________________ Message 18 ____________________________________ Time: 05:25:37 PM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: New product announcement I wasn't predicting this item to be the first new product on the website this year but I had a need for the device in some other activities. Production parts are on order and bench testing is far enough along to bolster my confidence that this 20A Solid State Relay is ready to go up on the website. It will probably be about 30 days before I can take orders. I don't build products here any more and my production house needs some time. We'll probably build 100 of these for the first batch. In the mean time, I'd be pleased to answer any questions about it. See: http://aeroelectric.com/Catalog/AECcatalog.html This product uses a newly developed, standard package philosophy that reduces assembly time It also reduces time needed to get new products on the market. The electronics are easy, the packaging can be a real cost driver. There's a stream of 6 or so so new devices on burners that will fit into this same package or the next size up. Bob . . . ---------------------------------------- ( "Problems are the price of progress. ) ( Don't bring me anything but trouble. ) ( Good news weakens me." ) ( -Charles F. Kettering- ) ---------------------------------------- ________________________________ Message 19 ____________________________________ Time: 07:47:53 PM PST US From: "Emrath" Subject: AeroElectric-List: RE:496 Audio--easy fix John, I believe, if you are using a Garmin portable held for the XM feed, there are some settings on the "Sound" page to control the volume. Time: 05:52:53 PM PST US From: N81JG@aol.com Subject: Re: AeroElectric-List: 496 Audio--easy fix HI Dave, I just got my RV7A panel all together and the XM antenna working. When I turned on the XM, radio and intercom ( I don't have an audio panel since I have only an SL30) I had the XM come on at high volume. I then noted that there was no volume control for the XM other than the intercom or headset controls. The GPS warning came through clear. I guess I will have to place a potentiometer in the GPS 1/8" output line to control the XM volume. Does anyone know how and where I get the right pot to do the volume control? I decided when I wired the Flightcom intercom and set the dip switches I didn't want the music to mute each time the radio or intercom squelch was broken so I will have to keep the music volume toned down so I will not miss any reception or warning. Oh, I guess the warnings will be toned down with the music. I'll have to see how that works. Mainly I want to be able to control XM music volume independent of the radio. John Greaves RV7A nearing completion VariEze N81JG nearing replacement of overhauled engine Redding, CA Marty ________________________________ Message 20 ____________________________________ Time: 07:47:53 PM PST US From: "Emrath" Subject: AeroElectric-List: RE:496 Audio--easy fix Dave, First, thank you for your diligence in this matter and for sharing your knowledge openly on this list. If I understand your comments below the "Voice -" line from the 496 is left open, right? I think the only reason for the 220 ohm resistor may be due to having the EFIS voice on the same input connection. I think Bob has commented on this before on this list or it may be in his book, I seem to recall something about this in his audio amplifier section dealing with audio isolation. Bob, can you "weigh-in" on this issue? Marty Time: 04:03:32 PM PST US From: "Dave Saylor" Subject: AeroElectric-List: 496 Audio--easy fix We have the audio working as desired from the 496. It turned out to be a very simple solution. To recount: It was my intention to have terrain warnings from a Garmin 496 wired to the unswitched audio input of a Garmin GMA340 audio panel. Garmin sells a "power/data cable" that provides wiring for audio output along with serial data and 12VDC to power the GPS. The audio wires are labeled "voice+" and "voice-". Garmin also sells a similar cable that terminates in a speaker housed adjacent to a 12V plug for using in the car. I took the speaker housing apart and confirmed that the voice+/- wires connected to the speaker. When we ran the voice wires into the audio panel, we got nothing. We tried several approaches, including running the audio into DME (nothing), ADF (nothing), though an audio transformer, though a potentiometer and through various simple resistors (zip, zero, nada). Just dead air from the 496. Finally, Jacek Kesy, who works at AirCrafters, discovered that when the "voice-" wire from the GPS was disconnected from the audio panel, everything worked perfectly. Audio must be grounding somewhere else, and the wire that certainly seems like audio ground is actually "audio disable". Once the voice- wire is grounded, you have to turn the 496 off and back on to get any audio. Here is how the final scenario is wired: 1/8" audio jack is wired to Music 1 on the audio panel. It outputs warnings and XM audio. Music 1 is muted by intercom activity or incoming transmissions. As an aside, I also have a 1/8" audio jack wired through a toggle so I can select either XM or some other source for Music 1. But that has no bearing on the 496 audio problem. >From the 496 power/data cable, the "voice+" wire ties to a 220 ohm >resistor, then to the unswitched audio input at the audio panel. The only other unswitched audio input is from the EFIS. It also goes through a 220 ohm resistor. Perhaps someone else can tell us what exactly the 220 ohm resistors do--my understanding is that they balance the two audio signals. I don't know what would happen without them. So now, even though the warnings coming from Music 1 are at time muted, I always get the EFIS warnings and the terrain warnings, as long as the audio panel is on. There are a bunch of setup parameters for the 496 as well on the Sound page of the main menu. Those are all pretty intuitive and seem to mostly effect the audio jack, not the output to the power/data cable. So that's it. Problem solved basically by trial and error, but it's working the way I want it to now. Dave Saylor AirCrafters LLC 140 Aviation Way Watsonville, CA 831-722-9141 831-750-0284 CL www.AirCraftersLLC.com ________________________________ Message 21 ____________________________________ Time: 09:07:57 PM PST US From: Jim Dabney Subject: Re: AeroElectric-List: New product announcement Bob, Will this new solid state relay be suitable for use as the alternator relay for the SD-8 (Z-13) or for the alternator relay for a Jabiru 20 amp alternator, replacing relay S704-1? As I recall, you said in your Houston class that the solid state relays have much lower holding current than conventional relays. Jim At 08:23 PM 11/7/2007, you wrote: > > >I wasn't predicting this item to be the first >new product on the website this year but I had >a need for the device in some other activities. > >Production parts are on order and bench testing is >far enough along to bolster my confidence that >this 20A Solid State Relay is ready to go up on >the website. It will probably be about 30 days >before I can take orders. I don't build products >here any more and my production house needs >some time. We'll probably build 100 of these for >the first batch. > >In the mean time, I'd be pleased to answer >any questions about it. See: > >http://aeroelectric.com/Catalog/AECcatalog.html > >This product uses a newly developed, standard >package philosophy that reduces assembly time >It also reduces time needed to get new products >on the market. The electronics are easy, the >packaging can be a real cost driver. There's a >stream of 6 or so so new devices on burners >that will fit into this same package or the next >size up. > > > Bob . . . > > ---------------------------------------- > ( "Problems are the price of progress. ) > ( Don't bring me anything but trouble. ) > ( Good news weakens me." ) > ( -Charles F. Kettering- ) > ---------------------------------------- > > ------------------------------------------------------------------------------------- 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.