---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 06/04/03: 23 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:19 AM - flap circuit using DPDT relay (Dan Checkoway) 2. 08:00 AM - Re: Mid-Continent turn coordinator -- tilt (Robert L. Nuckolls, III) 3. 08:30 AM - Re: 10nF mylar cap (MikeM) 4. 09:36 AM - Re: Mid-Continent turn coordinator -- tilt question (BobsV35B@aol.com) 5. 11:25 AM - d sub shells (Robert Dickson) 6. 11:34 AM - MAC trim gauge & switch connection (Robert Dickson) 7. 12:01 PM - Re: MAC trim gauge & switch connection (Robert L. Nuckolls, III) 8. 12:04 PM - Re: d sub shells (Robert L. Nuckolls, III) 9. 12:06 PM - BNC soldier style connectors (Rick Fogerson) 10. 12:13 PM - Re: MAC trim gauge & switch connection (Dan Checkoway) 11. 12:25 PM - Re: MAC trim gauge & switch connection (Michel Therrien) 12. 12:32 PM - Re: MAC trim gauge & switch connection (Randy Pflanzer) 13. 12:47 PM - Re: MAC trim gauge & switch connection () 14. 01:00 PM - Re: MAC trim gauge & switch connection (Greg Young) 15. 01:22 PM - Re: BNC soldier style connectors (Robert L. Nuckolls, III) 16. 01:34 PM - Re: MAC trim gauge & switch connection (Robert Dickson) 17. 01:46 PM - Re: MAC trim gauge & switch connection (Robert Dickson) 18. 01:53 PM - Re: MAC trim gauge & switch connection (Robert Dickson) 19. 04:57 PM - Re: MAC trim gauge & switch connection (Robert L. Nuckolls, III) 20. 05:23 PM - Re: Merging wiring - FWF (Robert L. Nuckolls, III) 21. 06:22 PM - Re: MAC trim gauge & switch connection (Greg Young) 22. 07:43 PM - Re: MAC trim gauge & switch connection (Robert L. Nuckolls, III) 23. 07:47 PM - Re: ground plane (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 03:19:07 AM PST US From: "Dan Checkoway" Subject: AeroElectric-List: flap circuit using DPDT relay --> AeroElectric-List message posted by: "Dan Checkoway" Bob, I'm wondering if you have seen this design before: http://www.infinityaerospace.com/Flap.pdf I bought the cheap Radio Shack relay (http://www.radioshack.com/searchsku.asp?find=275-218) and wired it up according to the drawing and it works perfectly. I'm just curious if you see any potential snags by using that design. Thanks, )_( Dan RV-7 N714D http://www.rvproject.com ________________________________ Message 2 _____________________________________ Time: 08:00:06 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Mid-Continent turn coordinator -- tilt question --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 06:49 PM 6/3/2003 -0400, you wrote: >--> AeroElectric-List message posted by: BobsV35B@aol.com > >In a message dated 6/3/03 5:29:06 PM Central Daylight Time, dan@rvproject.com >writes: > > > "Calibrated for installation in vertical panel" > > >Good Evening Once Again Dan, > >I obviously didn't read your original message correctly prior to sending my >message. You have a Turn Coordinator and not a Turn and Bank. > >My message was specifically oriented toward proper mounting of the T&B not a >TC. However, the same thing applies. > >It should be mounted as the manufacturer intended. You can purchase rate >instruments that are calibrated for slanted panels. Since the TC never >tells the >truth anyway, I guess mounting it correctly would not be as important as is >mounting a T&B correctly . . . Bob, I understand your preference for pure-yaw rate sensing as a panel display for turning rate indicator but I need to call you on the rhetoric . . . a turn coordinator is just as "truthful" as any other instrument on the panel in terms of what it's designed to do. Successful integration of the turn coordinator into nearly 100,000 light aircraft over decades speaks to it's utility for service as both wing leveling and as a panel display for hand flying the airplane sans gyros. I've shot many a no-gyro approach behind a turn-coordinator and ridden shotgun for other pilots while they honed their skills at the same task. While performance of this instrument might be considered a compromise of features found in rate gyros of old, I'll suggest that the industry has demonstrated the "losses" to be minimal in exchange for useful "additions". I've flown both instruments and my personal preference favors the turn coordinator. Individual preferences aside, may I suggest it's disingenuous to label the turn-coordinator as untruthful. Bob . . . -------------------------------------------- ( Knowing about a thing is different than ) ( understanding it. One can know a lot ) ( and still understand nothing. ) ( C.F. Kettering ) -------------------------------------------- ________________________________ Message 3 _____________________________________ Time: 08:30:45 AM PST US From: MikeM Subject: AeroElectric-List: Re: 10nF mylar cap --> AeroElectric-List message posted by: MikeM > Time: 07:03:01 AM PST US > From: "Robert L. Nuckolls, III" > Subject: Re: AeroElectric-List: 10nF mylar cap. > > 1 nF is 1000 pF and .001 mF > > So the 10 nF capacitor callout can also be written > as .01 mF or 10,000 pF . . . and Radio Shack has > had them since day-one. > > Bob . . . > Minor nit, Bob. 1nf is 1000pF or 0.001uF (the lower case m is reserved for milli, while lower case u is used for micro) MikeM ________________________________ Message 4 _____________________________________ Time: 09:36:21 AM PST US From: BobsV35B@aol.com Subject: Re: AeroElectric-List: Mid-Continent turn coordinator -- tilt question --> AeroElectric-List message posted by: BobsV35B@aol.com In a message dated 6/4/03 10:00:51 AM Central Daylight Time, bob.nuckolls@cox.net writes: > I've flown both instruments and my personal preference > favors the turn coordinator. Individual preferences > aside, may I suggest it's disingenuous to label > the turn-coordinator as untruthful. > > Bob . . . > Good Morning Bob, We have been through this before and I am afraid we will have to agree to disagree. When I am rolling down a runway after making a turn onto the runway just before takeoff and my rate gyro shows an indication that I am either turning or rolling while the airplane is going straight with the wheels are solidly on the ground I think it is fair to say that the instrument is not telling the truth. When I have to check the indication of other instruments to tell whether that instrument is telling me that I am rolling or yawing, I feel the instrument is not telling me the truth. If I am flying a nice knife edge, the instrument will be telling the truth as far as the fact that I am neither rolling nor yawing, but if there is any sense in my head that it is depicting a wings level situation, it is definitely not presenting any indication that is consistent with the current state of the flight. I think I mentioned early on that I installed TCs in all of my training airplanes when the unit first became available. I had applauded it's use as a low cost sensor for autopilots and felt that it would make a good instrument to aid in partial panel flying. It was only after several years of use that I gradually came to my present position. I think the TC is largely responsible for the plethora of accidents we have experienced when pilots are presented with a partial panel scenario. I wholeheartedly agree that a competent pilot can use either successfully. I now feel that a pilot trained and competent in the use of a T&B is more likely to retain that competency than one who has been initially trained in the use of the TC. That has to do with the mindset of the pilot and how both instruments integrate into normal everyday flying, but that is an even longer story and I will let it go for now. Your's for differences of opinion. Happy Skies, Old Bob ________________________________ Message 5 _____________________________________ Time: 11:25:53 AM PST US Subject: AeroElectric-List: d sub shells From: Robert Dickson --> AeroElectric-List message posted by: Robert Dickson I'd like to echo some of the recent sentiments regarding dsub connectors and crimp pins. I've found them to be very user friendly. My question is about the shells for the connectors. In a couple of places behind my panel there's just not room to use the shell. I've supported the wires next to the connectors to relieve any stress. Is this an ok practice? thanks, Robert Dickson RV-6A electrical ________________________________ Message 6 _____________________________________ Time: 11:34:47 AM PST US Subject: AeroElectric-List: MAC trim gauge & switch connection From: Robert Dickson --> AeroElectric-List message posted by: Robert Dickson I'm installing a mac/Ray Allen elevator trim servo in the elevator of my Rv-6A. I've read Bob's article on using a modified dsub connector to hook up the servo, but I'm not sure how to best connect the led trim gauge and the switch in the panel. Both of these items mount from the front of the panel, making it difficult to install and remove them on a temporary basis during panel construction. I suppose I could just connect them on a temp basis for testing using wire nuts, then butt splice them during final panel installation, but I'm curious as to how others may have dealt with this situation. thanks, Robert Dickson RV-6A electrical ________________________________ Message 7 _____________________________________ Time: 12:01:59 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: MAC trim gauge & switch connection --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 02:34 PM 6/4/2003 -0400, you wrote: >--> AeroElectric-List message posted by: Robert Dickson > > >I'm installing a mac/Ray Allen elevator trim servo in the elevator of my >Rv-6A. I've read Bob's article on using a modified dsub connector to hook up >the servo, but I'm not sure how to best connect the led trim gauge and the >switch in the panel. >Both of these items mount from the front of the panel, making it difficult >to install and remove them on a temporary basis during panel construction. >I suppose I could just connect them on a temp basis for testing using wire >nuts, then butt splice them during final panel installation, but I'm >curious as to how others may have dealt with this situation. Why not put connectors on these leads too? Bob . . . ________________________________ Message 8 _____________________________________ Time: 12:04:28 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: d sub shells --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 02:25 PM 6/4/2003 -0400, you wrote: >--> AeroElectric-List message posted by: Robert Dickson > > >I'd like to echo some of the recent sentiments regarding dsub connectors and >crimp pins. I've found them to be very user friendly. > >My question is about the shells for the connectors. In a couple of places >behind my panel there's just not room to use the shell. I've supported the >wires next to the connectors to relieve any stress. Is this an ok practice? Sure. Our targets use shell-less d-subs in some places and we passed some pretty rough environmental stress tests. If the connector is used in a system that would give you heartburn if it quit, then you could sho-goo the backside of the connector . . BUT ONLY AFTER you're sure it's wired correctly. It's VERY hard to move pins around after they're potted into place. Bob . . . ________________________________ Message 9 _____________________________________ Time: 12:06:55 PM PST US From: "Rick Fogerson" Subject: AeroElectric-List: BNC soldier style connectors --> AeroElectric-List message posted by: "Rick Fogerson" Bob, I want to use soldier style BNC connectors with RG400 coax. A Jim Weir article said DigiKey sells AMP male soldier style connectors under part no. A24424-ND. However, on their website, the picture looks like it has a crimped collar on the coax cable and the discription says "CONN PLUG BNC RG174, 188 CRMP TIN" and customer service wasn't knowledgeable. Is this what I want or do you know the correct PN if it isn't? Thanks, Rick Fogerson RV3 wiring Boise, ID. ________________________________ Message 10 ____________________________________ Time: 12:13:26 PM PST US From: "Dan Checkoway" Subject: Re: AeroElectric-List: MAC trim gauge & switch connection --> AeroElectric-List message posted by: "Dan Checkoway" FWIW, I'm planning on using individual D-sub pins/sockets (available from B&C) for cases like this where I need removable connectors on 24 AWG wires. For example, at the back of the plane where I want to be able to disconnect the elevator if I have to...a 9-pin connector is too bulky to fit through the grommet hole in the HS spar (even reduced like Bob suggests in his article). In that location I'll connect all 5 wires with D-subs, staggered a bit so it doesn't look like, I believe Bob put it, a snake swallowed a mouse or something like that. Heat shrink over each connector, heat shrink over the whole mess, should be reliable and not too fat. I'm just a newbie, though, so you may want a 2nd opinion on this...I'm sure you'll get one. 8-) do not archive )_( Dan RV-7 N714D http://www.rvproject.com ----- Original Message ----- From: "Robert Dickson" Subject: AeroElectric-List: MAC trim gauge & switch connection > --> AeroElectric-List message posted by: Robert Dickson > > I'm installing a mac/Ray Allen elevator trim servo in the elevator of my > Rv-6A. I've read Bob's article on using a modified dsub connector to hook up > the servo, but I'm not sure how to best connect the led trim gauge and the > switch in the panel. > Both of these items mount from the front of the panel, making it difficult > to install and remove them on a temporary basis during panel construction. > I suppose I could just connect them on a temp basis for testing using wire > nuts, then butt splice them during final panel installation, but I'm > curious as to how others may have dealt with this situation. > > thanks, > > Robert Dickson > RV-6A electrical > > ________________________________ Message 11 ____________________________________ Time: 12:25:54 PM PST US From: Michel Therrien Subject: Re: AeroElectric-List: MAC trim gauge & switch connection --> AeroElectric-List message posted by: Michel Therrien I installed both elevator and aileron trims in my plane. I mounted the two indicators and the aileron trim switch on a removable sub panel. Everything connects with a DB15 connector. See: http://mthobby.pcperfect.com/ch601/images/DCP01826.JPG The MAC accessories are next to the compass. Michel --- Robert Dickson wrote: > --> AeroElectric-List message posted by: Robert > Dickson > > I'm installing a mac/Ray Allen elevator trim servo > in the elevator of my > Rv-6A. I've read Bob's article on using a modified > dsub connector to hook up > the servo, but I'm not sure how to best connect the > led trim gauge and the > switch in the panel. > Both of these items mount from the front of the > panel, making it difficult > to install and remove them on a temporary basis > during panel construction. > I suppose I could just connect them on a temp basis > for testing using wire > nuts, then butt splice them during final panel > installation, but I'm > curious as to how others may have dealt with this > situation. > ===== ---------------------------- Michel Therrien CH601-HD http://mthobby.pcperfect.com/ch601 http://www.zenithair.com/bldrlist/profiles/mthobby http://pages.infinit.net/mthobby __________________________________ ________________________________ Message 12 ____________________________________ Time: 12:32:30 PM PST US From: Randy Pflanzer Subject: Re: AeroElectric-List: MAC trim gauge & switch connection --> AeroElectric-List message posted by: Randy Pflanzer I found the 26 gauge wire a little small for crimp connectors and you are right, the D-sub pins in behind the panel seem unnecessary. I just soldered these connections and covered them with shrink. I know, I know......I used the "s" word. However, in the case of these small wires, it works fine. Randy F1 Rocket #95 http://mywebpages.comcast.net/f1rocket/ ----- Original Message ----- From: Robert Dickson Subject: AeroElectric-List: MAC trim gauge & switch connection > --> AeroElectric-List message posted by: Robert Dickson > > > I'm installing a mac/Ray Allen elevator trim servo in the elevator > of my > Rv-6A. I've read Bob's article on using a modified dsub connector > to hook up > the servo, but I'm not sure how to best connect the led trim gauge > and the > switch in the panel. > Both of these items mount from the front of the panel, making it > difficultto install and remove them on a temporary basis during > panel construction. > I suppose I could just connect them on a temp basis for testing > using wire > nuts, then butt splice them during final panel installation, but I'm > curious as to how others may have dealt with this situation. > > thanks, > > Robert Dickson > RV-6A electrical > > > _- > ======================================================================_- = - The AeroElectric-List Email Forum - > _- > ======================================================================_- = !! NEWish !! > _- > ======================================================================_- = List Related Information > _- > ====================================================================== > > > > ________________________________ Message 13 ____________________________________ Time: 12:47:34 PM PST US From: Subject: Re: AeroElectric-List: MAC trim gauge & switch connection --> AeroElectric-List message posted by: I wired the MAC with a 5 pin Deans connector. These are gold plated pins with a very positive connections, easy to install and readily available. (R/C hobby stuff)After final connection the entire assembly will be protected with an appropriate sized piece of heat shrink. Darwin N. Barrie Chandler AZ ----- Original Message ----- From: "Dan Checkoway" Subject: Re: AeroElectric-List: MAC trim gauge & switch connection > --> AeroElectric-List message posted by: "Dan Checkoway" > > FWIW, I'm planning on using individual D-sub pins/sockets (available from > B&C) for cases like this where I need removable connectors on 24 AWG wires. ________________________________ Message 14 ____________________________________ Time: 01:00:53 PM PST US From: "Greg Young" Subject: RE: AeroElectric-List: MAC trim gauge & switch connection --> AeroElectric-List message posted by: "Greg Young" I used a 5-pin flat Molex-type connector along with a single pin connector for the dimmer for each indicator. The trim indicator dimmer gets pulled high to dim the LEDs so it's connected to the panel light switch in parallel with the wire to the panel dimmer. The single pin connector made the harness routing a little cleaner. Regards, Greg Young - Houston (DWH) RV-6 N6GY ...project Phoenix Navion N5221K - just an XXL RV-6A > > > --> AeroElectric-List message posted by: Robert Dickson > --> > > I'm installing a mac/Ray Allen elevator trim servo in the > elevator of my Rv-6A. I've read Bob's article on using a > modified dsub connector to hook up the servo, but I'm not > sure how to best connect the led trim gauge and the switch in > the panel. Both of these items mount from the front of the > panel, making it difficult to install and remove them on a > temporary basis during panel construction. I suppose I could > just connect them on a temp basis for testing using wire > nuts, then butt splice them during final panel installation, > but I'm curious as to how others may have dealt with this situation. > > thanks, > > Robert Dickson > RV-6A electrical > ________________________________ Message 15 ____________________________________ Time: 01:22:09 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: BNC soldier style connectors --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 01:08 PM 6/4/2003 -0600, you wrote: >--> AeroElectric-List message posted by: "Rick Fogerson" > >Bob, >I want to use soldier style BNC connectors with RG400 coax. A Jim Weir >article said DigiKey sells AMP male soldier style connectors under part >no. A24424-ND. However, on their website, the picture looks like it has a >crimped collar on the coax cable and the discription says "CONN PLUG BNC >RG174, 188 CRMP TIN" and customer service wasn't knowledgeable. Is this >what I want or do you know the correct PN if it isn't? > Thanks, You want the military designation UG-88/U which is Amphenol's p/n 31-202 and Digikey's catalog number ARF1040-ND Installation instructions can be on page 299 of this document. http://www.amphenolrf.com/products/AssemblyInstructions/bnc.pdf Bob . . . -------------------------------------------- ( Knowing about a thing is different than ) ( understanding it. One can know a lot ) ( and still understand nothing. ) ( C.F. Kettering ) -------------------------------------------- ________________________________ Message 16 ____________________________________ Time: 01:34:15 PM PST US Subject: Re: AeroElectric-List: MAC trim gauge & switch connection From: Robert Dickson --> AeroElectric-List message posted by: Robert Dickson Dan I'm a newbie at this stuff as well, but this sounds like a good idea to me. If someone knows a good reason for us not to do this, let's hear it. Robert Dickson RV-6A electrical > From: "Dan Checkoway" > Reply-To: aeroelectric-list@matronics.com > Date: Wed, 4 Jun 2003 12:18:59 -0700 > To: > Subject: Re: AeroElectric-List: MAC trim gauge & switch connection > > --> AeroElectric-List message posted by: "Dan Checkoway" > > FWIW, I'm planning on using individual D-sub pins/sockets (available from > B&C) for cases like this where I need removable connectors on 24 AWG wires. > > For example, at the back of the plane where I want to be able to disconnect > the elevator if I have to...a 9-pin connector is too bulky to fit through > the grommet hole in the HS spar (even reduced like Bob suggests in his > article). In that location I'll connect all 5 wires with D-subs, staggered > a bit so it doesn't look like, I believe Bob put it, a snake swallowed a > mouse or something like that. Heat shrink over each connector, heat shrink > over the whole mess, should be reliable and not too fat. > > I'm just a newbie, though, so you may want a 2nd opinion on this...I'm sure > you'll get one. 8-) > > do not archive > )_( Dan > RV-7 N714D > http://www.rvproject.com > > ----- Original Message ----- > From: "Robert Dickson" > To: "Aeroelectric List" > Subject: AeroElectric-List: MAC trim gauge & switch connection > > >> --> AeroElectric-List message posted by: Robert Dickson > >> >> I'm installing a mac/Ray Allen elevator trim servo in the elevator of my >> Rv-6A. I've read Bob's article on using a modified dsub connector to hook > up >> the servo, but I'm not sure how to best connect the led trim gauge and the >> switch in the panel. >> Both of these items mount from the front of the panel, making it difficult >> to install and remove them on a temporary basis during panel construction. >> I suppose I could just connect them on a temp basis for testing using wire >> nuts, then butt splice them during final panel installation, but I'm >> curious as to how others may have dealt with this situation. >> >> thanks, >> >> Robert Dickson >> RV-6A electrical >> >> > > > > > > ________________________________ Message 17 ____________________________________ Time: 01:46:24 PM PST US Subject: Re: AeroElectric-List: MAC trim gauge & switch connection From: Robert Dickson --> AeroElectric-List message posted by: Robert Dickson Greg being fairly unsure of myself in matters electrical, I'm trying to understand exactly what you mean by this statement. > The trim indicator dimmer gets pulled > high to dim the LEDs so it's connected to the panel light switch in parallel > with the wire to the panel dimmer. > Regards, > Greg Young - Houston (DWH) I gather you've got a separate dimmer just for the LEDs. Are they unacceptably bright if undimmed at night? I've only got elevator trim and it seems like a hassle to install a dimmer just for that one gauge if it really isn't necessary. thanks for your help, Robert Dickson RV-6A electrical ________________________________ Message 18 ____________________________________ Time: 01:53:44 PM PST US Subject: Re: AeroElectric-List: MAC trim gauge & switch connection From: Robert Dickson --> AeroElectric-List message posted by: Robert Dickson >> I'm installing a mac/Ray Allen elevator trim servo in the elevator of my >> Rv-6A. I've read Bob's article on using a modified dsub connector to hook up >> the servo, but I'm not sure how to best connect the led trim gauge and the >> switch in the panel. >> Both of these items mount from the front of the panel, making it difficult >> to install and remove them on a temporary basis during panel construction. >> I suppose I could just connect them on a temp basis for testing using wire >> nuts, then butt splice them during final panel installation, but I'm >> curious as to how others may have dealt with this situation. > > Why not put connectors on these leads too? > > Bob . . . what kind of connectors? will shrink-tubed d-sub pins be ok, as Dan suggested? Robert Dickson RV-6A electrical do not archive ________________________________ Message 19 ____________________________________ Time: 04:57:53 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: MAC trim gauge & switch connection --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 04:53 PM 6/4/2003 -0400, you wrote: >--> AeroElectric-List message posted by: Robert Dickson > > > > >> I'm installing a mac/Ray Allen elevator trim servo in the elevator of my > >> Rv-6A. I've read Bob's article on using a modified dsub connector to > hook up > >> the servo, but I'm not sure how to best connect the led trim gauge and the > >> switch in the panel. > >> Both of these items mount from the front of the panel, making it difficult > >> to install and remove them on a temporary basis during panel construction. > >> I suppose I could just connect them on a temp basis for testing using wire > >> nuts, then butt splice them during final panel installation, but I'm > >> curious as to how others may have dealt with this situation. > > > > Why not put connectors on these leads too? > > > > Bob . . . > >what kind of connectors? will shrink-tubed d-sub pins be ok, as Dan >suggested? I prefer d-subs for this kind of application. But individually covered d-sub pins works too. What you don't get is pull-apart resistance . . . but then wire bundles aren't flight control cables. They're not hard to install so that they don't have tension on them. When you use individually covered d-sub mates, put an overall cover of heat shrink over the array of connections. Then use a nice, tight string-tie or tye-wrap at each end of cover to provide some pull-apart protection. Bob . . . ________________________________ Message 20 ____________________________________ Time: 05:23:20 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Merging wiring - FWF --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 08:53 AM 6/3/2003 +0100, you wrote: >--> AeroElectric-List message posted by: Gerry Holland > >Bob Hi! from UK > >Did some light reading of Aero Connection Manual this morning over breakfast >to establish some guidance over wiring compatibility. Very wholesome! Still >need your words of wisdom! > >In an effort to keep efficient and 'tidy' Wiring, can you advise or confirm >that it it probably be OK to merge various Instrument Sensor wires in 22 AWG >unsceened with the Magneto screened wires (18 AWG) into a single loom, >separating again once through Firewall conduit. I have 22 AWG Screened if >more suitable. > >Regards > >Gerry There is no advantage in adding shields to any wires that share the bundle with magneto p-leads already shielded. Be sure to hook up the shields as depicted in several places on the Z-figures . . . ground the shield at the engine end only and use the shield to provide a ground for the magneto control switch. Other wires that might share wire routing and/or firewall penetrations with the p-leads need not be shielded unless the installation diagrams call for shielded wires. Bob . . . ________________________________ Message 21 ____________________________________ Time: 06:22:51 PM PST US From: "Greg Young" Subject: RE: AeroElectric-List: MAC trim gauge & switch connection --> AeroElectric-List message posted by: "Greg Young" Robert, There is a dimming function built into the indicator. It's a day/night mode affair, not variable. It's counter intuitive to me but when you apply power to the dimmer wire, the LEDs go dim. I hooked it up so the panel light switch provides the power to the LED dimmer. I've just got 2 wires from the switch, one to the indicator and the other to a rheostat dimmer that feeds all the other panel lights. You can power the LED dimmer from any source, even a dedicated switch. I figured when it was dark enough to light the panel I'd want the LED's dimmed too. I'm somewhat electron challenged as well and it took a while to decipher MAC's wiring diagram but maybe this will help. Greg > -----Original Message----- > From: owner-aeroelectric-list-server@matronics.com > [mailto:owner-aeroelectric-list-server@matronics.com] On > Behalf Of Robert Dickson > Sent: Wednesday, June 04, 2003 3:46 PM > To: aeroelectric-list@matronics.com > Subject: Re: AeroElectric-List: MAC trim gauge & switch connection > > > --> AeroElectric-List message posted by: Robert Dickson > --> > > Greg > being fairly unsure of myself in matters electrical, I'm > trying to understand exactly what you mean by this statement. > > > The trim indicator dimmer gets pulled > > high to dim the LEDs so it's connected to the panel light switch in > > parallel with the wire to the panel dimmer. > > > Regards, > > Greg Young - Houston (DWH) > > I gather you've got a separate dimmer just for the LEDs. Are > they unacceptably bright if undimmed at night? I've only got > elevator trim and it seems like a hassle to install a dimmer > just for that one gauge if it really isn't necessary. > > thanks for your help, > > Robert Dickson > RV-6A electrical > ________________________________ Message 22 ____________________________________ Time: 07:43:25 PM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: MAC trim gauge & switch connection --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 08:22 PM 6/4/2003 -0500, you wrote: >--> AeroElectric-List message posted by: "Greg Young" > >Robert, > >There is a dimming function built into the indicator. It's a day/night mode >affair, not variable. It's counter intuitive to me but when you apply power >to the dimmer wire, the LEDs go dim. I hooked it up so the panel light >switch provides the power to the LED dimmer. I've just got 2 wires from the >switch, one to the indicator and the other to a rheostat dimmer that feeds >all the other panel lights. You can power the LED dimmer from any source, >even a dedicated switch. I figured when it was dark enough to light the >panel I'd want the LED's dimmed too. I'm somewhat electron challenged as >well and it took a while to decipher MAC's wiring diagram but maybe this >will help. Two level dimming is not uncommon for something that is basically illuminated all the time . . . like an LED bar graph. To be visible in sunlight, one generally designs for the LEDs to run max bright . . . which would be too bright for the dark cockpit. So . . . the "dim" wire is exactly that . . . a wire that tells the indicator to go into the dim mode. Depending on how sophisticated their input signal conditioning the indicator may switch from bright to dim for any voltage that appears on the DIM COMMAND wire. This would let you hook the DIM COMMAND wire to a string of dimmed panel lights such that any time they are ON at any intensity, the trim indicator goes to the dim mode. Given that the Ray Allen installation drawing calls for hooking DIM COMMAND to a "hard" 14v upstream of any dimmer control suggests that this is not the case. If you use B&C dimmers in the recommended configuration, there is NEVER less than 4 volts on any lamps . . . the system is turned OFF by max counter clockwise rotation of dimmer knob which simply reduces the panel lamps to minimum voltage for any usable light output . . . quite dim. If the Ray Allen indicator used a sophisticated sensor with a wide voltage range, then it would probably not go to the "day-bright" mode when panel lamps are reduced only down to 4v. Suggest you consider hooking the DIM COMMAND line to some other night lighting circuit like nav lights. Any time the nav lights are on, the indicator intensity goes to dim. Bob . . . ________________________________ Message 23 ____________________________________ Time: 07:47:49 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: ground plane --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 09:53 AM 5/30/2003 -0500, you wrote: >--> AeroElectric-List message posted by: "Troy Scott" > >Bob, > >I've been following the thread about the optimum ground plane for the >transponder. What is the optimum diameter for a circular ground >plane? I'd like to mount the antenna on a 7" diameter aileron bellcrank >access plate on the bottom of the wing of my Glasair. Others have done >this, but I'll figure out something else if you think I should. The "optimum" tuned ground plane is same radius as height of antenna . . . or about 5.2" diameter for transponder. But it will probably work just fine on the access plate too. Bob . . .