AeroElectric-List Digest Archive

Sun 06/22/08


Total Messages Posted: 12



Today's Message Index:
----------------------
 
     1. 05:12 AM - Dimmer trick (Carlos Trigo)
     2. 05:36 AM - Re: Re: Diode Wiring (Robert L. Nuckolls, III)
     3. 05:43 AM - Re: Dimmer trick (Robert L. Nuckolls, III)
     4. 06:05 AM - Re: NAV Troubleshooting (William Gill)
     5. 06:05 AM - Inverting the sense for warning tone controls (Robert L. Nuckolls, III)
     6. 06:28 AM - Dimmer trick (James H Nelson)
     7. 06:35 AM - Roger Revenson - radios (Fergus Kyle)
     8. 09:40 AM - Re: Inverting the sense for warning tone controls/ audio mixer/ stereo music amp (Vernon Little)
     9. 02:42 PM - Re: Dimmer trick (Peter Laurence)
    10. 02:57 PM - Re: Millivolt Power Source? (Eric M. Jones)
    11. 05:10 PM - VOR won't show to indication. (Matthew Schumacher)
    12. 06:22 PM - Re: Contactor Diodes (Dave VanLanen)
 
 
 


Message 1


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    Time: 05:12:32 AM PST US
    From: "Carlos Trigo" <trigo@mail.telepac.pt>
    Subject: Dimmer trick
    Listers I completed my instrument lights circuit, in which I have a dimmer, and all works OK. Nevertheless, when I tested it at night (still at my garage) I noticed that there are a couple of instruments (e.g. the Trutrak ADI) which have a brighter light than the others, and obviously the single dimmer, operating all lights simultaneously, doesn't get me an optimal dimming position for all lights at the same time. Is there a trick to obtain similar brightness in all lights? Can that be achieved by simply installing resistors in the brighter ones? Carlos


    Message 2


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    Time: 05:36:13 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@cox.net>
    Subject: Re: Diode Wiring
    > > > > >Just received the diode assembly from B&C for the main bus to endurance > > >bus wiring. The wiring diagram that came with it shows two of its > > >terminals joined going to the main bus. In the Aero Connection, Bob says > > >only one of the terminals goes to the main bus and the other two can be > > >removed. > > > > > >Please clarify--which is correct? > > > > Flip a coin . . . it doesn't matter much. > > SOMETIMES . . . the two paralleled diodes > > match close enough to sort-of share the > > loads but It's poor practice to depend on > > it. How big are your e-bus loads? > > > > Bob . . . > > >E-BUS loads about 3.5 amps; maximum 9.5. >Roger. Mount the diode to a metal surface, wiring to one diode is sufficient, two diodes doesn't hurt anything. Bob . . .


    Message 3


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    Time: 05:43:13 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@cox.net>
    Subject: Re: Dimmer trick
    At 01:08 PM 6/22/2008 +0100, you wrote: >Listers > > >I completed my instrument lights circuit, in which I have a dimmer, and >all works OK. > >Nevertheless, when I tested it at night (still at my garage) I noticed >that there are a couple of instruments (e.g. the Trutrak ADI) which have a >brighter light than the others, and obviously the single dimmer, operating >all lights simultaneously, doesn t get me an optimal dimming position for >all lights at the same time. > > >Is there a trick to obtain similar brightness in all lights? > >Can that be achieved by simply installing resistors in the brighter ones? Whatever you want to try is fair game. While heading the electrical avionics group on the GP-180 at Lear, I crafted a specification for a 4-channel panel dimmer that featured separate dimming curves for incandescent, EL, gas discharge and LED lighting. We were able to make the entire suite of technologies track each other from one knob. It's not a trivial task and many builders install separate dimmers for each technology. Setting up cockpit lighting was probably the worst job any electron-herder could contemplate for a complex TC aircraft back then. We had a real witches brew of technologies and every program manager, test-pilot and vp of engineering had his/her own idea of how things should work. No matter what you did, somebody was less than thrilled about it. Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ----------------------------------------


    Message 4


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    Time: 06:05:14 AM PST US
    From: "William Gill" <wgill10@comcast.net>
    Subject: NAV Troubleshooting
    Hello Jim, If the navaid is on the field where you're based, you could use an antenna from a portable com radio and connect it to the nav coax from each radio BEFORE the splitter to confirm operation of each radio. Then, work downstream if that worked. Bill RV-7 N151WP Lee's Summit, MO -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Jim Piavis Sent: Saturday, June 21, 2008 7:17 PM Subject: AeroElectric-List: NAV Troubleshooting I've recently started flying my RV-7 with a Garmin 480/ SL-30. NAV antenna is an Archer antenna in the right tip. Strobe/ nav light cables are run per Archer instructions along leading edge of the antenna. COM works great on both radios, but I'm getting nothing for NAV and need to troubleshoot the problem. The single coax hits a splitter, which feeds the 480 and SL-30. What's the best method for troubleshooting? Thanks, Jim RV-7 Redmond, WA


    Message 5


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    Time: 06:05:40 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@cox.net>
    Subject: Inverting the sense for warning tone controls
    A number of builders who are incorporating DIY warning tone generators in their projects are finding situations where closing a contact to ground is the best way to enable a particular tone. The drawings in Chapter 18 only accommodate a open-ground-for-tone function. I've published a simple modification to the schematic that will provide the close-ground-for-tone operation. This same mod can be applied to any of the three generators. http://aeroelectric.com/Pictures/Schematics/Control_Sense_Inversion.pdf Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ----------------------------------------


    Message 6


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    Time: 06:28:03 AM PST US
    Subject: Dimmer trick
    From: James H Nelson <rv9jim@juno.com>
    Carlos, The ADI Tru Trak instrument has a seperate dimmer circuit inside it. It requires a seperate 12v input to make it work. If I remember, by applying the 12v to this wire, it dims the lighting on the instrument. I added a seperate mini toggle along side the instrument that says "dim". Check your wiring schematic for the ADI and I think you will find the input required. I havn't used it as I'm just about to do my first flight. Its been at the airport for about two months while I "put it together" for the last time so I can not tell you how it worked. Jim Nelson N15JN RV9-A ____________________________________________________________ The Two Coreys-New Season Child Stars. Adult Issues. New season of the Two Coreys airs Sundays 1 http://thirdpartyoffers.juno.com/TGL2141/fc/JKFkuJi7WQr3rI2jU1sRgD264LX2qc79rxhctcWIsJha9dEa2CfXwV/


    Message 7


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    Time: 06:35:45 AM PST US
    From: "Fergus Kyle" <VE3LVO@rac.ca>
    Subject: Roger Revenson - radios
    Roger, If it's any help, I worked the city here as Antenna system troubleshooter for amateur radio for about 20 years. In almost every problem, the solution turned out to be connectors, and BNC modes in particular, although others were there. The usual cause was homemade connections, not following EXACTLY the instructions or not having the correct tools - (Soldering equipment), such as dripped solder, tiny wires running loose, etc. 9 times of 10, I went to the antenna cable connector and found the fault. For efficiency, I would concentrate on the connector(s) first. I don't want to appear pushy but might suggest getting an old hand from the local radio club interested. They often are intrigued by radio trouble and a second discipline in the think tank is useful. Good luck, Ferg


    Message 8


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    Time: 09:40:30 AM PST US
    From: "Vernon Little" <rv-9a-online@telus.net>
    Subject: Inverting the sense for warning tone controls/
    audio mixer/ stereo music amp For those who are not interested in the DIY approach, here's my link to a tone annunciator module that will perform either active high or active low sensing. For fans of Bob's work, there's actually a family of devices inspired by what he's done, updated and packaged as complete products. This includes a 10-channel audio mixer/amp (aka isolation amplifier), a stereo music headphone amplifier and the tone annunciator. For more information: www.vx-aviation.com Thanks, Vern Little -----Original Message----- <snip> A number of builders who are incorporating DIY warning tone generators in their projects are finding situations where closing a contact to ground is the best way to enable a particular tone. The drawings in Chapter 18 only accommodate a open-ground-for-tone function. I've published a simple modification to the schematic that will provide the close-ground-for-tone operation. This same mod can be applied to any of the three generators.


    Message 9


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    Time: 02:42:19 PM PST US
    From: "Peter Laurence" <PLaurence@the-beach.net>
    Subject: Dimmer trick
    Carlos, Try this site. http://www.a-and-t-labs.com/products.htm Peter RV9A N60PL _____ From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Carlos Trigo Sent: Sunday, June 22, 2008 8:08 AM Subject: AeroElectric-List: Dimmer trick Listers I completed my instrument lights circuit, in which I have a dimmer, and all works OK. Nevertheless, when I tested it at night (still at my garage) I noticed that there are a couple of instruments (e.g. the Trutrak ADI) which have a brighter light than the others, and obviously the single dimmer, operating all lights simultaneously, doesn't get me an optimal dimming position for all lights at the same time. Is there a trick to obtain similar brightness in all lights? Can that be achieved by simply installing resistors in the brighter ones? Carlos


    Message 10


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    Time: 02:57:04 PM PST US
    Subject: Re: Millivolt Power Source?
    From: "Eric M. Jones" <emjones@charter.net>
    Guys... See: http://www.5bears.com/circuits.htm#Circuit%2001 One op amp and a couple resistors is the right way to do the job. Anything less leaves you at the mercy of....well I shouldn't tell you...you might be scared. -------- 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=189142#189142


    Message 11


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    Time: 05:10:34 PM PST US
    From: Matthew Schumacher <schu@schu.net>
    Subject: VOR won't show to indication.
    List, I'm having some problems with my VOR in my cessna 150 which has the RT328C radio. The problem is that I can't get it to show a to indication. The from indication seems to work and is consistent with what my GPS says so I dial 180* off and the needle kinda centers but the indicator shows off. So far I have pulled the radio and head and had the avionics shop test it and it worked just fine on the bench showing to and from for the generated vor signal, so I figured the problem was the antenna cable. I then replaced the antenna cable with RG400 using the balun shown here: http://www.aeroelectric.com/articles/BALUN/Balun_Fabrication.html There isn't any connectors or breaks in the cable as it runs directly from the radio up to the tail where the balun and antenna is. My connections are clean so I'm certain that the cable isn't the problem. The AWOS and identifier seem to come though ok, though there is some radio noise. At this point I'm not sure what else to look at. Anyone have any suggestions? Thanks, schu


    Message 12


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    Time: 06:22:32 PM PST US
    From: "Dave VanLanen" <davevanlanen@sbcglobal.net>
    Subject: Re: Contactor Diodes
    Bob, I think I mis-stated question 2. What I meant to say was, "why would the spike be stopped by the diode when it could more easily travel through the coil wire directly to the opening switch?" In reading your reply carefully, I believe I might be misunderstanding the actual "flow" of energy in this instance. When you say that the diode is positioned to conduct for any voltage that attempts to go more negative than ground, are you saying that the spike will be conducted through the diode (in the direction of the arrow) and back to the coil, and that this cycle will continue until the resistance of the coil dissipates it? If so, what makes the diode a "preferred" path over the path through the wire to the opening switch? Is this just the nature of a diode? I apologize if I am taking up too much of this venue's resouces in trying to understand this concept. If this is an issue, please let me know and I will try to gain an understanding by finding someone locally to discuss in more detail. Thanks, Dave and 2) Why would the spike be stopped by the diode when it could more easily > travel through the coil wire directly to ground? Don't understand this . . . since the induced voltage caused by coil collapse is negative going at switch when the switch opens, and the diode (a check valve for electron flow) is positioned to conduct for any voltage that attempts to go more negative than ground, the spike current presented at the switch end is indeed shunted to ground and returns to the coil through ground. Virtually ALL the energy stored in the coil's magnetic field is dissipated in THE RESISTANCE OF THE COIL over tens of milliseconds. Review the write up on Kettering ignition system in chapter on OV relays. Kettering's points/coil/ distributor exploited this effect to generate a multi-kilovolt spike from a 6v car battery. Here he WANTED the spike to live long and prosper. In our case, the same kind of spike has deleterious effects on the contacts of the controlling switch. Kettering used 'condenser' to mitigate deleterious effects on points.




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