AeroElectric-List Digest Archive

Sun 10/17/10


Total Messages Posted: 12



Today's Message Index:
----------------------
 
     1. 06:16 AM - Re: Laptop supply for your car/airplane (user9253)
     2. 06:20 AM - Re: Laptop supply for your car/airplane (Eric M. Jones)
     3. 06:47 AM - Re: Re: Laptop supply for your car/airplane (Jared Yates)
     4. 06:53 AM - Re: Re: Laptop supply for your car/airplane (Jared Yates)
     5. 07:14 AM - Re: Re: Laptop supply for your car/airplane (RGent1224@aol.com)
     6. 08:30 AM - Re: Laptop supply for your car/airplane (Robert L. Nuckolls, III)
     7. 09:50 AM - Need advice on grounding of wing surface mounted antenna (RAMI AV-10) (Howard M. Plevyak Jr.)
     8. 05:41 PM - Re: Need advice on grounding of wing surface mounted antenna (RAMI AV-10) (Robert L. Nuckolls, III)
     9. 06:20 PM - Re: Strobe Noise Low Voltage? (Noel Loveys)
    10. 06:48 PM - STROBE NOISE RESOLVED??? (MHerder)
    11. 07:22 PM - Re: STROBE NOISE RESOLVED??? (MHerder)
    12. 08:46 PM - Re: Re: Laptop supply for your car/airplane (Noel Loveys)
 
 
 


Message 1


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    Time: 06:16:23 AM PST US
    Subject: Re: Laptop supply for your car/airplane
    From: "user9253" <fran4sew@banyanol.com>
    Thanks for that link Bob. Now what we need is a source for the DC plug to fit into the laptop. Right now I use a 12vdc to 120vac inverter along with the laptop power brick. The disadvantage of that is having to carry around two inefficient boxes instead of one. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=316026#316026


    Message 2


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    Time: 06:20:20 AM PST US
    Subject: Re: Laptop supply for your car/airplane
    From: "Eric M. Jones" <emjones@charter.net>
    Remember that anything using a hard drive depends on a little cushion of air between the read-write head and the disk. Using a HD above 10,000 feet cabin pressure is risky. Apple, Maxtor and Seagate state 10,000 feet as the maximum operating altitude. Don't forget those IPods. -------- 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=316027#316027


    Message 3


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    Time: 06:47:09 AM PST US
    Subject: Re: Laptop supply for your car/airplane
    From: Jared Yates <email@jaredyates.com>
    Fortunately many of the ipods have gone to flash memory I do believe. This is also the case for some of the smaller laptops. On Oct 17, 2010, at 9:17, "Eric M. Jones" <emjones@charter.net> wrote: > > Remember that anything using a hard drive depends on a little cushion of air between the read-write head and the disk. Using a HD above 10,000 feet cabin pressure is risky. > > Apple, Maxtor and Seagate state 10,000 feet as the maximum operating altitude. Don't forget those IPods. > > -------- > 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=316027#316027 > > > > > > > > > >


    Message 4


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    Time: 06:53:51 AM PST US
    Subject: Re: Laptop supply for your car/airplane
    From: Jared Yates <email@jaredyates.com>
    I use an Igo power adapter that replaces the oem notebook supply. It can work off of regular ac, sae 12v jack, and even tha special plug on some of the airliners. It also can power two other devices (cell phones etc) from the same one input. The tips are interchangeable, so you can use the same supply for multiple computer types, one at a time of course. I travel extensively and have used the Igo in all sorts of interesting situations, and the whole package isn't much larger than my OEM adapter was in the first place. On Oct 17, 2010, at 9:12, "user9253" <fran4sew@banyanol.com> wrote: > > Thanks for that link Bob. Now what we need is a source for the DC plug to fit into the laptop. Right now I use a 12vdc to 120vac inverter along with the laptop power brick. The disadvantage of that is having to carry around two inefficient boxes instead of one. > Joe > > -------- > Joe Gores > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=316026#316026 > > > > > > > > > >


    Message 5


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    Time: 07:14:51 AM PST US
    From: RGent1224@aol.com
    Subject: Re: Laptop supply for your car/airplane
    Try E-Bay there are some power supply's that have universal connection and the price is right for scavenging whatever you need Try this link to see one. I use this one with my laptop in the car _http://cgi.ebay.com/UNIVERSAL-Power-Supply-AC-DC-Adapter-ACER-HP-Laptop-/16 0350558034?pt=Laptop_Adapters_Chargers&hash=item2555a35752_ (http://cgi.ebay.com/UNIVERSAL-Power-Supply-AC-DC-Adapter-ACER-HP-Laptop-/160350558034?pt=La ptop_Adapters_Chargers&hash=item2555a35752) Looks like you might have to copy&paste it Dick In a message dated 10/17/2010 8:18:01 A.M. Central Daylight Time, fran4sew@banyanol.com writes: --> AeroElectric-List message posted by: "user9253" <fran4sew@banyanol.com> Thanks for that link Bob. Now what we need is a source for the DC plug to fit into the laptop. Right now I use a 12vdc to 120vac inverter along with the laptop power brick. The disadvantage of that is having to carry around two inefficient boxes instead of one. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=316026#316026


    Message 6


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    Time: 08:30:49 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Laptop supply for your car/airplane
    At 10:22 PM 10/16/2010, you wrote: >Looks to be in a metal enclosure, though. > >On Sat, Oct 16, 2010 at 10:49 PM, Joe Dubner ><<mailto:jdubner@yahoo.com>jdubner@yahoo.com> wrote: ><<mailto:jdubner@yahoo.com>jdubner@yahoo.com> That single-sided PCB with minimal filtering (judging only by the pictures -- see http://tinyurl.com/2943gjk) probably radiates switching transient energy through VHF and beyond. Hmmm . . . I thought I tiny-url'd the link to the top address for the Ebay offering. Here's the corrected link plus a couple others . . . http://tinyurl.com/2wftqo9 http://tinyurl.com/2w22toe http://tinyurl.com/33grzmg Some of these are listed as fixed 24 volt output but can certainly be 'jeeped' to lower their output setpoint. Of course if used with a laptop PC as per Bob's original suggestion, this point may be mute because the laptop has it's own issues. But I'd be leery about using it around receiving equipment in an aircraft (or elsewhere). Astute observations. It's a pretty straightforward experiment to survey for potential interference problems . . . also not a big job to add enclosure and line filtering should they prove necessary. My suggestions about using the laptop were driven more by the idea of using the computer for data acquisition as opposed to in-flight entertainment or generation of work product. Of course, altitude limits conducive to hard drive functionality would have to be observed. I'll order one of these puppies with the idea of a permanent installation in my travel vehicle. Bob . . .


    Message 7


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    Time: 09:50:45 AM PST US
    From: "Howard M. Plevyak Jr." <hplevyak@mac.com>
    Subject: Need advice on grounding of wing surface mounted antenna
    (RAMI AV-10) Guys, I'm building a GlaStar and currently installing two RAMI AV-10 Comm antennae on the tops of my wing. They will be mounted to the aluminum skin surface with a backing plate. Instructions call for a =93clean Metal Surface for good ground connection=94. My wing skins are currently primer painted both outside and inside. Should I clean the prime paint off down to bare aluminum on the just the inside where the back up plate attaches? Or should I clean both inside and outside? Here's the spec sheet on the AV-10. http://www.rami.com/gaa/antenna-info.cfm?pid=6 Thanks for any advice, Howard Plevyak GlaStar, North Bend, Ohio hplevyak@mac.com


    Message 8


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    Time: 05:41:06 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Need advice on grounding of wing surface mounted
    antenna (RAMI AV-10) At 11:45 AM 10/17/2010, you wrote: >Guys, >I'm building a GlaStar and currently installing two RAMI AV-10 Comm >antennae on the tops of my wing. They will be mounted to the >aluminum skin surface with a backing plate. > >Instructions call for a "clean Metal Surface for good ground >connection". My wing skins are currently primer painted both outside >and inside. > >Should I clean the prime paint off down to bare aluminum on the just >the inside where the back up plate attaches? Or should I clean both >inside and outside? See http://aeroelectric.com/Pictures/Antenna/Comm_Antenna_Installation.gif Bob . . .


    Message 9


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    Time: 06:20:59 PM PST US
    From: "Noel Loveys" <noelloveys@yahoo.ca>
    Subject: Strobe Noise Low Voltage?
    First point... is only the front end (supply) voltage of a strobe is low voltage. The leads ot the tubes and the tubes themselves are definitely high voltage. Tos keep clicking out of your headphones start with a well grounded strobe installation with shielded wires going from the strobe unit to the tubes. Then you may want to have a look at the Audio installation in your plane. My experience has been most problems in avionics stem somewhere from poor grounding. Checking grounding can be time consuming as you will first want to locate all the grounds. Dont forget the ground on the case of some regulators. Once you know where all the ground connections are you can start making sure they are all shiny clean. On other lists there has been a lot of discussion about grounding shields; one end or two. All the installation manuals I've ever seen say ground shield wires at the source end only. There is and exception to this and that is when coax is used. Then you will want to make sure the grounds on both ends are clean. Noel -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of MHerder Sent: October 15, 2010 10:57 AM Subject: AeroElectric-List: Strobe Noise Low Voltage? <michaelherder@beckgroup.com> Can and how if so, low voltage cause strobe noise in your headset? -------- One Rivet at a Time! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=315816#315816


    Message 10


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    Time: 06:48:55 PM PST US
    Subject: STROBE NOISE RESOLVED???
    From: "MHerder" <michaelherder@beckgroup.com>
    So I've spent hours upon hours, maybe 15-20 hrs or so trying to find my strobe noise. Looking back I just had too many variables, and not enough constants. Please follow along and see if you can figure out what was or is going on. Equipment: Garmin SL40 Radio, Flightcom Intercom, Pilot USA ANR Headset, Flight Data Systems Audio Mixer, all headphone and mic jacks insulated and grounds grounds at one point wires shielded and drained at one end only. So here's how my story goes, please follow as there may be something to be learned here Condition: Mild strobe noise, but annoying whining sound. Attempts to solve: 1) Tried jumper to closest to positive lead of battery power supply. NO SUCCESS 2) Tried shielded wire to strobe. NO SUCCESS 3) Identified that proximity of wires to audio sources was a contributing factor. Verified by moving wires closer to and further away from each other. AHA! I thought. I Decided to reassemble entire harness and reroute all audio rather than reroute strobe. This decision was made since I wasn't real happy with my first attempt at the audio source anyway. 4) After rewiring harness, it was observed that I had no side tone... This was all of a sudden, since side tone was working prior and I know my SL40 produces side tone. I realized that I must have miswired something and I was correct. I screwed up and mixed barrel, tip and ring. ALL OF A SUDDEN EVERYTHING WORKED GREAT AND I WAS ON CLOUD 9. NO STROBE NOISE, SIDETONE WAS WORKING, TRANSMIT AND RECEIVE CLEAR AS DAY. WHAT A FANTASTIC DAY IT WAS... JUST ONE MORE THING TO DO.... HOOK UP MY AUDO INPUT FOR AN IPOD. 5) Hooked up audio input. STOBE NOISE AGAIN???? The input must be the input creating an issue I thought. Disconnect audio input. STILL STROBE NOISE!!!! What the hell is going on? How could this be? 6) Well maybe I didnt reroute everything far enough away? So I moved the strobe power supply. STILL STROBE NOISE. WHAT THE HECK IS GOING ON. NOW IM 15 HRS INTO THIS MESS AND GETTING REALLY TIRED OF PLAYING WITH IT. 7) Success I think No strobe noise. So what happened between step 6 and 7? I think the same thing that happened between step 4 and 5. A change in the volume settings in the headset. When I hooked up my Ipod, I wasnt getting sound loud so I messed with the left and right independent volume control, I could have just turned up the volume in the Ipod, but I didnt . I turned up the volume in each input of the headset. For some reason I played with the volume again tonight. I found that can make the noise go away by keeping each of the headset volumes below 60% for left and right channels in the headset. I can still hear and adjust radio volume and intercom volume, and all is well. Im very happy, if this is the final solution to the problem. The only thing I havent done is tried with a regular non ANR headset with mono input. The reason that bring this up is that I now believe that I have some acceptable level of noise that will probably never go away, and is probably very very minute in comparison to issues that others are having, but my hypothesis is that the noise is so minute that if not amplified by my headset, would never have been detected. Any thoughts on the matter are welcome and encouraged. Im glad to share the story just so others know of another cause of their perceived problem . Thanks for sticking with me and enduring this long story. MY TECHNICAL ADVISOR TOLD ME TO PUT THE DAMN THING BACK TOGETHER AND GO FLY! I think he's right. -------- One Rivet at a Time! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=316107#316107


    Message 11


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    Time: 07:22:01 PM PST US
    Subject: Re: STROBE NOISE RESOLVED???
    From: "MHerder" <michaelherder@beckgroup.com>
    One thing further to add Bob. Thank you so much for your help in solving this dilemma. Let me clarify, that I'm not trying to find the holy grail of a totally noise free airplane, but what I thought was an issue might not be one all together. I just wanted to know and understand what was going on. I think that type of tenacity is what has lead me to the very near completion of the airplane (wheras most homebuilts don't get finished up), but this tenacity has also been a stop block to progress in certain instances. Your post regarding your issue on the king air line and the usefulnesss of Signal to noise ratio as a benchmark was not read by me until after I posted a moment ago, but I think you hit the nail on the head. While taxiing around yesterday... Probably while you were posting I notice that even with the headhpones past 60% volume turned up, I couldnt hear the noise with my Jabiru turning past 1300 rpm anyway. Now with the volume at 50% or below I cant hear it at all. Is my headphne actually amplifying the minimal noise? I think so. -------- One Rivet at a Time! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=316108#316108


    Message 12


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    Time: 08:46:16 PM PST US
    From: "Noel Loveys" <noelloveys@yahoo.ca>
    Subject: Re: Laptop supply for your car/airplane
    There are a few netbooks out there that don't have hard drives... might be an idea. Noel -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Eric M. Jones Sent: October 17, 2010 10:48 AM Subject: AeroElectric-List: Re: Laptop supply for your car/airplane <emjones@charter.net> Remember that anything using a hard drive depends on a little cushion of air between the read-write head and the disk. Using a HD above 10,000 feet cabin pressure is risky. Apple, Maxtor and Seagate state 10,000 feet as the maximum operating altitude. Don't forget those IPods. -------- 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=316027#316027




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