---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 02/13/11: 23 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:08 AM - Re: Open squelch (Brantel) 2. 07:08 AM - Re: AOA indicator (Robert L. Nuckolls, III) 3. 07:20 AM - Re: ALTRAK Dimmer Circuit (Mark Sletten) 4. 07:21 AM - Re: Re: Machine Pin sub-D crimpers (Robert L. Nuckolls, III) 5. 07:30 AM - Re: solid state relays (Robert L. Nuckolls, III) 6. 07:46 AM - Re: AOA indicator (Mark Sletten) 7. 07:59 AM - A210 issues with Radio (not intercom) squelch always open (Brantel) 8. 08:00 AM - Re: Open squelch (Brantel) 9. 08:14 AM - Re: AOA indicator (paul wilson) 10. 08:45 AM - Re: Re: AOA indicator (rayj) 11. 09:36 AM - Re: solid state relays () 12. 11:49 AM - Re: solid state relays (Jeff Luckey) 13. 12:23 PM - Re: Shorai LiFePO4 (Robert L. Nuckolls, III) 14. 12:40 PM - Re: solid state relays () 15. 12:58 PM - Re: solid state relays (David) 16. 04:33 PM - Re: Machine Pin sub-D crimpers (rparigoris) 17. 05:04 PM - Re: solid state relays () 18. 06:04 PM - Re: solid state relays (James Robinson) 19. 06:06 PM - AOA (EMAproducts@aol.com) 20. 07:36 PM - Power for Checking Systems Out on the Ground (Bob Falstad) 21. 07:36 PM - Re: Battery disconnect switch (Speedy11@aol.com) 22. 08:26 PM - Re: Re: Battery disconnect switch (Jeff Luckey) 23. 08:35 PM - No click when pushing PTT (N777TY) ________________________________ Message 1 _____________________________________ Time: 05:08:41 AM PST US Subject: AeroElectric-List: Re: Open squelch From: "Brantel" The new firmware was suppose to fix the intercom squelch issues which it may do but in my case it seems they messed something up with the radio squelch.... Read this topic online here: http://forums.matronics.com/viewtopic.php?p=330866#330866 ________________________________ Message 2 _____________________________________ Time: 07:08:45 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: AOA indicator At 08:01 PM 2/12/2011, you wrote: > > >That is what the original poster was referring to. Even though the >AOA is working perfectly, it is giving you false information. I think this is the 'nut' of what has yanked some folk's chains. Heated AOA or IAS will indeed continue to MEASURE and display the rudimentary stimulus that the sensor watches. IAS measures the DIFFERENCE of two pressures that is translated into a CALIBRATED IAS reading (complete with sweet-spots . . . or sweet-bands) AOA can be a vane that actually weather- cocks to align with relative wind -or- the system can measure pressure differentials. Both of those phenomenon are calculated upon interpreted, CALIBRATED data are displayed along with sweet-spots intended to be a guide for operation of the airplane. The concept often missed is that these sweet-spots are DERIVED numbers confirmed by repeated flight tests. In no case does either IAS or AOA directly measure the the conditions (shape) that set flying qualities of particular wing under conditions that exist right now. So while the heated instrument is indeed performing as advertised in spite of icing elsewhere on the airplane, prior CALIBRATIONS for the sweet-spot are no longer valid. It's perfectly GOOD information. IAS is correct. AOA is correct. But the rules of application have changed in ways that are difficult to scale without taking off our GA pilot's hat and putting on the engineering test pilot's hat. Here the debate becomes purely personal. Do you understand what's necessary to re- interpret this data before you attempt a landing? If so, it's your choice. But if not so sure, then what behaviors (plan-b) are most likely to produce a happy outcome while ignoring previous calibrations of compromised sweet-spots. Bob . . . ________________________________ Message 3 _____________________________________ Time: 07:20:37 AM PST US Subject: AeroElectric-List: Re: ALTRAK Dimmer Circuit From: "Mark Sletten" Gang, Nothing heard from the list. As an aside, I tried contacting Trutrak, but according to the person I spoke, with the only tech who can answer my question only corresponds via email. His response to my query seemed to indicate he either didn't carefully read it, or he misunderstood it. I requested he call me to clarify, but so far no joy. Any help from the experts here would be greatly appreciated! -------- Mark Sletten Legacy FG N828LM http://www.legacyfgbuilder.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=330874#330874 ________________________________ Message 4 _____________________________________ Time: 07:21:22 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Machine Pin sub-D crimpers At 11:58 PM 2/12/2011, you wrote: > > >Hi Group > >I modified my Steinair D-sub crimper (and Jans the same time) by >making new pins and moving them to the other side of the spring. > >See pics DSCN5312 thru 16: > >http://www.europaowners.org/forums/gallery2.php?g2_itemId=30957 > >I believe the tool with the modified ratchet is probably for High >Density pins, but with the ratchet ground off the last two clicks >works well for D-subs as well. Anyway if you have a tool that is >over-crimping D-sub machined pins, all hope is not lost Hmmm . . . It's not clear to me that the tool "supplied by Steinair" was stock. Over-crimping has never been an issue with any of the Eclipse tools that I'm aware of. Further, positioning of the spring has always been such that it presses the entry end of the positioner to the tools wire entry face. A little lathe (or file and drill motor) sculpting of a stock positioner will correct approximately .040" of mis-positioning. Some more lathe work will fabricate new positioners for HD pins. But in any case, errors of penetration for the punches is a whole new issue. I'd certainly like to put my hands on any tools that appear to be badly fabricated for this feature. Bob . . . >Ron Parigoris > > >Read this topic online here: > >http://forums.matronics.com/viewtopic.php?p=330857#330857 > > Bob . . . //// (o o) ===========o00o=(_)=o00o======== < Go ahead, make my day . . . > < show me where I'm wrong. > ================================ ________________________________ Message 5 _____________________________________ Time: 07:30:53 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: solid state relays At 12:45 AM 2/13/2011, you wrote: >Hi Bob >What is your opinion of these relays as replacements for the >mechanical relays we have been using? >Jim Robinson Lamar (and perhaps others) have brought production solid state contactors to the market that are BI-DIRECTIONAL. I.e, the can both load and charge a battery making them suitable for battery contactors as opposed to rudimentary control devices (relays). Emacs! I have no reason to believe they do not perform as advertised. Lamar was going to send me one to play with but I think that offer fell into a crack. In any case, assuming they DO perform as advertised, what are your design goals that might drive a decision to substitute this product into your airplane? Assuming further that your airplane is architectured to offer a plan-b for contactor failure, will this substitution offer a demonstrable reduction in cost of ownership? Bob . . . ________________________________ Message 6 _____________________________________ Time: 07:46:59 AM PST US Subject: AeroElectric-List: Re: AOA indicator From: "Mark Sletten" kuffel(at)cyberport.net wrote: > It will still tell me accurately if my angle of attack is well above stall with clean wings. While I don't know what my stall margin actually is at the moment I'm certainly better off than with no or incorrect AOA information. That depends on how you interpret and use the data it provides. If you are flying with an iced wing, the only data even the most accurate AOA indication provides is that the wing is not stalling at the current AOA. An AOA indicator is only that; an indicator. It tells you the current angle of attack. Its only value lies in knowing a second crucial piece of data: at what AOA the wing will stall. If your wing is iced you no longer have the second crucial piece of data. Given that you have not stalled, the AOA indicator is not providing data you don't already have, that you have, in fact, not stalled. How does an accurate AOA indication help in this scenario? Mark Sletten Read this topic online here: http://forums.matronics.com/viewtopic.php?p=330881#330881 ________________________________ Message 7 _____________________________________ Time: 07:59:23 AM PST US Subject: AeroElectric-List: A210 issues with Radio (not intercom) squelch always open From: "Brantel" If you are having problems with the your A210 radio squelch (not intercom) always being open or taking the max setting of 10 to prevent it from opening please contact http://www.icomamerica.com/en/contactusform.aspx?ContactType=TS and let them know so they might start to build a case on this one. It seems that version 1.53 has changed the way the radio squelch works for the worse... Read this topic online here: http://forums.matronics.com/viewtopic.php?p=330884#330884 ________________________________ Message 8 _____________________________________ Time: 08:00:07 AM PST US Subject: AeroElectric-List: Re: Open squelch From: "Brantel" Tim, Please visit http://www.icomamerica.com/en/contactusform.aspx?ContactType=TS and let them know about this so they might start creating a case on this one. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=330883#330883 ________________________________ Message 9 _____________________________________ Time: 08:14:40 AM PST US From: paul wilson Subject: Re: AeroElectric-List: AOA indicator Bingo Bob, Thanks for the summary PaulW ======== At 07:04 AM 2/13/2011, you wrote: > > >At 08:01 PM 2/12/2011, you wrote: >> >> >>That is what the original poster was referring to. Even though the >>AOA is working perfectly, it is giving you false information. > > I think this is the 'nut' of what has > yanked some folk's chains. Heated AOA > or IAS will indeed continue to MEASURE and > display the rudimentary stimulus that > the sensor watches. IAS measures > the DIFFERENCE of two pressures that > is translated into a CALIBRATED IAS > reading (complete with sweet-spots > . . . or sweet-bands) > > AOA can be a vane that actually weather- > cocks to align with relative wind -or- > the system can measure pressure differentials. > Both of those phenomenon are calculated upon > interpreted, CALIBRATED data are displayed > along with sweet-spots intended to be > a guide for operation of the airplane. > > The concept often missed is that these > sweet-spots are DERIVED numbers confirmed > by repeated flight tests. In no case does > either IAS or AOA directly measure the > the conditions (shape) that set flying qualities > of particular wing under conditions that > exist right now. > > So while the heated instrument is indeed > performing as advertised in spite of icing > elsewhere on the airplane, prior CALIBRATIONS > for the sweet-spot are no longer valid. It's > perfectly GOOD information. IAS is correct. > AOA is correct. But the rules of application > have changed in ways that are difficult to scale > without taking off our GA pilot's hat and > putting on the engineering test pilot's hat. > > Here the debate becomes purely personal. > Do you understand what's necessary to re- > interpret this data before you attempt a > landing? If so, it's your choice. But if > not so sure, then what behaviors (plan-b) > are most likely to produce a happy outcome > while ignoring previous calibrations of > compromised sweet-spots. > > Bob . . . > > ________________________________ Message 10 ____________________________________ Time: 08:45:22 AM PST US From: rayj Subject: Re: AeroElectric-List: Re: AOA indicator do not archive ***Disclaimer: I've never had an icing encounter in an airplane. The following is pure speculation based on several icing encounters I have had in cars.*** I think the value that a working AOA or AI has after an icing encounter is to allow you to return to a known AOA or airspeed. The knowledge that your airplane will fly at a particular AS/AOA even with the ice load that has accumulated, has value if you deviate from the point while distracted by other tasks. It allows you to return to a point where you know the aircraft will fly. During any change in attitude it would give a known AOA/AS value that can be adhered to to assure continued flight. Clearly ANY deviation from that know AOA/AS carries additional risk. I'm guessing that some of the intuitive clues that help seat of the pants flying might be altered by an ice accumulation. The specific one I'm thinking of is the sounds. I know this to be true in cars. I believe this is another reason to take steps to avoid having to fly the aircraft without an AOA/AS. Raymond Julian Kettle River, MN On 02/13/2011 09:44 AM, Mark Sletten wrote: > --> AeroElectric-List message posted by: "Mark Sletten" > > > kuffel(at)cyberport.net wrote: >> It will still tell me accurately if my angle of attack is well above stall with clean wings. While I don't know what my stall margin actually is at the moment I'm certainly better off than with no or incorrect AOA information. > > > That depends on how you interpret and use the data it provides. If you are flying with an iced wing, the only data even the most accurate AOA indication provides is that the wing is not stalling at the current AOA. > > An AOA indicator is only that; an indicator. It tells you the current angle of attack. Its only value lies in knowing a second crucial piece of data: at what AOA the wing will stall. If your wing is iced you no longer have the second crucial piece of data. > > Given that you have not stalled, the AOA indicator is not providing data you don't already have, that you have, in fact, not stalled. How does an accurate AOA indication help in this scenario? > > Mark Sletten > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=330881#330881 > > ________________________________ Message 11 ____________________________________ Time: 09:36:40 AM PST US From: Subject: Re: AeroElectric-List: solid state relays Jim, I=99ve used them in several application in our projects. They performed well (better than the mechanicals) in high stress applications like running the hydraulic gear pump that is prone to fast on/off re-press cycles. In fact, I liked them so much I replaced my old heavy clunkers with the lighter Crydoms. http://www.berkut13.com/berkut50.htm#SSR Don=99t forget the =9Cfreewheel=9D diodes on motor loads. The schematics are in the data sheet. James Redmon Berkut/Race 13 From: James Robinson Sent: Saturday, February 12, 2011 10:45 PM Subject: AeroElectric-List: solid state relays Hi Bob What is your opinion of these relays as replacements for the mechanical relays we have been using? Jim Robinson www.newark.com/crydom+relay ________________________________ Message 12 ____________________________________ Time: 11:49:13 AM PST US From: "Jeff Luckey" Subject: RE: AeroElectric-List: solid state relays The Crydom units seem pretty cool & for certain applications they are ideal but.. (putting on my devil's advocate hat..) There are a couple of things to consider: 1. They seem a little pricey - Digikey lists them for ~$118 each. (the equivalent 'can-type' contactor is ~$30) 2. If you need SPST or DPST contacts you are SOL 3. In many applications, you need to surround them w/ protection diodes and/or MOVs or whatever (more components to mount & connect & possibly fail.) An example: (I'm just making this up;) Let's say you want to run a PM motor forward & backward. You can create an H bridge circuit w/ 2 mechanical SPDT relays pretty easily & for less than $50. To accomplish the same thing w/ the Crydoms you'll need 4 Crydom units. (That's ~$500.) And some clever circuitry to prevent the wrong pairs of relays from energizing at the same time. (so you don't release their [expensive] magic smoke) With the versatility of a properly-chosen good-old mechanical relay, it is often possible to use the same relay in many different circuits aboard you plane. That can mean reduced part# count. That's simpler, easier to keep spares, allows emergency substitution, etc. Don't get me wrong, I'm all over semiconductors when they make circuitry simpler, better, cheaper, etc. But until the price point comes down quite a bit, it's hard to beat good-old mechanical relays. -Jeff _____ From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of berkut13@berkut13.com Sent: Sunday, February 13, 2011 09:28 Subject: Re: AeroElectric-List: solid state relays Jim, I've used them in several application in our projects. They performed well (better than the mechanicals) in high stress applications like running the hydraulic gear pump that is prone to fast on/off re-press cycles. In fact, I liked them so much I replaced my old heavy clunkers with the lighter Crydoms. http://www.berkut13.com/berkut50.htm#SSR Don't forget the "freewheel" diodes on motor loads. The schematics are in the data sheet. James Redmon Berkut/Race 13 From: James Robinson Sent: Saturday, February 12, 2011 10:45 PM Subject: AeroElectric-List: solid state relays Hi Bob What is your opinion of these relays as replacements for the mechanical relays we have been using? Jim Robinson www.newark.com/crydom+relay ________________________________ Message 13 ____________________________________ Time: 12:23:56 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Shorai LiFePO4 At 11:16 AM 1/31/2011, you wrote: > >Check out "Shorai". >New light weight Japanese LiFePO4 battery with quite enthousiastic >motorcyclist customers. >Works well enough at low temperatures. >Max. charging current 18A (no external shunts). Higher ratings coming. >Has a 5 pin plug that I suspect may give access to the 4 cells. >For our use I might want to monitor max. cell voltage to see <4V or >interrupt charging. Interesting offering. I had some conversation with my battery guru of more than 30 years (Skip Koss) last week. He was telling me of a Lithium product being sold onto come of the smaller bizjets. Amazing power to weight ratios when warm. But won't deliver more than 200A at 0C. Operators take the battery indoors for overnight storage at low temperatures. He also told me that GM was on their third supplier of lithium cells for offerings into the all electric car market. Qualification hoop-jumping levied by automobile manufacturers on purchased goods is about 3x the thickness of an FAA qual package. It does not bode well that a game of musical batteries has not produced a solid winner so late in the commitment to field a product. As the King of Siam might note, "curiouser and curiouser". Watch this space . . . Bob . . . ________________________________ Message 14 ____________________________________ Time: 12:40:32 PM PST US From: Subject: Re: AeroElectric-List: solid state relays What you wrote is all true...however.... At work, we were using the Leech Mill-Spec, inert gas filled, high-end relays...they were still failing during circuit break due to arcing. 2 Crydoms were cheaper than 4 of these for an H-bridge. Admittedly, the switch to SSRs was done in the interest of a quick fix to get the vehicles back in air...but it did solve the problem. Putting the mechanicals in the H-bridge config was not a guarantee that the failures would not re-occur and we didn=99t want to pile on arc snubbers. Personally, I had more than reliability reasons for the change =93 mainly weight, environmental concerns, and ease of retrofit. -James From: Jeff Luckey Sent: Sunday, February 13, 2011 11:44 AM Subject: RE: AeroElectric-List: solid state relays The Crydom units seem pretty cool & for certain applications they are ideal but.. (putting on my devil=99s advocate hat..) There are a couple of things to consider: 1.. They seem a little pricey =93 Digikey lists them for ~$118 each. (the equivalent =98can-type=99 contactor is ~$30) 2.. If you need SPST or DPST contacts you are SOL 3.. In many applications, you need to surround them w/ protection diodes and/or MOVs or whatever (more components to mount & connect & possibly fail) An example: (I=99m just making this up;) Let=99s say you want to run a PM motor forward & backward. You can create an H bridge circuit w/ 2 mechanical SPDT relays pretty easily & for less than $50. To accomplish the same thing w/ the Crydoms you=99ll need 4 Crydom units. (That=99s ~$500.) And some clever circuitry to prevent the wrong pairs of relays from energizing at the same time. (so you don=99t release their [expensive] magic smoke) With the versatility of a properly-chosen good-old mechanical relay, it is often possible to use the same relay in many different circuits aboard you plane. That can mean reduced part# count. That=99s simpler, easier to keep spares, allows emergency substitution, etc. Don=99t get me wrong, I=99m all over semiconductors when they make circuitry simpler, better, cheaper, etc. But until the price point comes down quite a bit, it=99s hard to beat good-old mechanical relays. -Jeff ------------------------------------------------------------------------- ------- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of berkut13@berkut13.com Sent: Sunday, February 13, 2011 09:28 Subject: Re: AeroElectric-List: solid state relays Jim, I=99ve used them in several application in our projects. They performed well (better than the mechanicals) in high stress applications like running the hydraulic gear pump that is prone to fast on/off re-press cycles. In fact, I liked them so much I replaced my old heavy clunkers with the lighter Crydoms. http://www.berkut13.com/berkut50.htm#SSR Don=99t forget the =9Cfreewheel=9D diodes on motor loads. The schematics are in the data sheet. James Redmon Berkut/Race 13 ________________________________ Message 15 ____________________________________ Time: 12:58:57 PM PST US From: David Subject: Re: AeroElectric-List: solid state relays What concerns are there from "freewheel" diodes? Thanks, David M. berkut13@berkut13.com wrote: > Jim, > Ive used them in several application in our projects. They performed > well (better than the mechanicals) in high stress applications like > running the hydraulic gear pump that is prone to fast on/off re-press > cycles. In fact, I liked them so much I replaced my old heavy > clunkers with the lighter Crydoms. > http://www.berkut13.com/berkut50.htm#SSR > Dont forget the freewheel diodes on motor loads. The schematics > are in the data sheet. > James Redmon > Berkut/Race 13 > *From:* James Robinson > *Sent:* Saturday, February 12, 2011 10:45 PM > *To:* aeroelectric-list@matronics.com > > *Subject:* AeroElectric-List: solid state relays > Hi Bob > What is your opinion of these relays as replacements for the > mechanical relays we have been using? > Jim Robinson > > > www.newark.com/ *crydom+relay* > > * > > > * -- If you're an American, just say NO to the Obamanation, to socialism, and get rid of Soros. ________________________________ Message 16 ____________________________________ Time: 04:33:57 PM PST US Subject: AeroElectric-List: Re: Machine Pin sub-D crimpers From: "rparigoris" Hi Bob To clarify things, I was speaking about two separate tools, one from Steinair on the right and one that was lent to me which is on the left. The Steinair tool is on the right and crimps D-sub pins just fine. The problem with the one I received was it had an aluminium spacer on the wrong side of the spring, and even if you put it on the right side of the spring, it would not properly position D-sub machined pins. That said, the tool on the left which was lent to me has a nice machined brass spacer that works perfect on the Steinair tool to position D-sub machined pins, so I made one exactly the same as the tool on the left and installed it on my Steinair tool on the right and now the Steinair tool works perfectly with machined D-sub pins. I made a comment about the tool on the left. It is plenty old if rust and corrosion is any tell. I have no idea where it came from. The dies are different compared to the Steinair tool. If you insert a D-sub machined pin and squeeze the tool all the way it will over crimp. Someone ground off two of the ratchet teeth where instead of having to squeeze 5 notches before the tool releases, it releases after three ratchet notches. If you are careful it works fine on machined D-sub pins if you only click three times. I know the tool is designed for slightly smaller diameter pins and made mention if someone else happens to have one of these and tries to crimp a D-sub machined pin and obviously notices it overcrimps, by grinding off a few notches you can easily get by with this tool, and if you need to crimp smaller diameter pins, just crimp all the way. Sorry for any confusion. Ron Parigoris Read this topic online here: http://forums.matronics.com/viewtopic.php?p=330952#330952 ________________________________ Message 17 ____________________________________ Time: 05:04:10 PM PST US From: Subject: Re: AeroElectric-List: solid state relays >From diodes? Point them the correct direction. >From the motor...there is a reverse break down current generated when the power to the motor is cut off. That reverse flow of current is not good for the MOSFET inside the SSR. The diodes channel that current back to the robust windings of the motor (freewheeling) instead of making the SSR convert it to heat. Fun stuff, no? -James -----Original Message----- From: David Sent: Sunday, February 13, 2011 12:45 PM Subject: Re: AeroElectric-List: solid state relays What concerns are there from "freewheel" diodes? Thanks, David M. ________________________________ Message 18 ____________________________________ Time: 06:04:18 PM PST US From: James Robinson Subject: Re: AeroElectric-List: solid state relays I currently have one com antenna in the vertical of my Glasair. I only have one comm radio SL30. I have been thinking of adding a second com radio, possibly a Garmin 430. Will I need an audio panel also? Can both radios share the one antenna? Or what would be the best arrangement for the setup? Jim James Robinson Glasair lll N79R Spanish Fork UT U77 ________________________________ Message 19 ____________________________________ Time: 06:06:48 PM PST US From: EMAproducts@aol.com Subject: AeroElectric-List: AOA My comment on icing and AOA systems ~~If you encounter any type of icing turn the AOA OFF unless you have full de-icing vane & aircraft. We haven't even done R&D on a heated vane because of liability. Even Boeing can't give you hard numbers with icing on wings. Heated vane and icing on wings is NOT a good deal! Elbie Mendenhall, EM Aviation, LLC _www.riteangle.com_ (http://www.riteangle.com) Is it your understanding that Elbie > claims that the "sweet spot" on his or any other > AOA display is golden under all challenges that > a pilot might face for comfortable arrival with > the earth? > ________________________________ Message 20 ____________________________________ Time: 07:36:23 PM PST US From: Bob Falstad Subject: AeroElectric-List: Power for Checking Systems Out on the Ground Bob N., et al, I'm getting closer to powering up my new IFR panel. I need a source of power for an extended period of time on the ground without the engine running for checking out the systems, their initial set-up, and for training myself on the real boxes. I have a BatteryMINDer charger/maintainer and a Radio Shack power supply whose output is rated at 13.8 VDC at 15 Amps. Should I just disconnect the main battery and use the power supply in its place? Can I hook the power supply up to the battery + and - terminals and use it as a "battery booster" (or would this toast the battery)? Should I just use the battery and charge it overnight with the BatteryMINDer? Other? I intend to bring up one circuit at a time and I want to measure each circuit's actual power consumption and I'll need to be careful not to overload the power supply. Best regards, Bob Falstad GlaStar N248BF ________________________________ Message 21 ____________________________________ Time: 07:36:23 PM PST US From: Speedy11@aol.com Subject: AeroElectric-List: Re: Battery disconnect switch Jeff, What I mean by noisy is 86 dB. That is the noise generated by the device as listed on the Tyco web site. 86 dB, while not immediately damaging to hearing, is very loud and can damage hearing if experienced over time. I wasn't referring to "noise" that would interfere with radio transmissions. 1. I don't know if the noise is continuous. Check with Tyco. 2. My experience with contactors normally used in aircraft is that the only significant noise generated is when the contactor is initially excited and the noise is the mechanical movement rather than an electrical noise. Thus, if the Tyco web site information is correct and if the noise is continuous, then my estimate is that the Tyco device is noisier than traditional solenoids. 3. No. Stan Sutterfield In a message dated 2/13/2011 3:01:45 A.M. Eastern Standard Time, aeroelectric-list@matronics.com writes: Not sure what you mean by noisy. Can you be more specific? 1. Is the noise continuous? 2. Is this device any noisier than the traditional solenoid? 3. Have you done some kind of testing or do you have you worked w/ this device? ________________________________ Message 22 ____________________________________ Time: 08:26:28 PM PST US From: "Jeff Luckey" Subject: RE: AeroElectric-List: Re: Battery disconnect switch Stan, I thought you were referring to electrical noise and thus was a little confused. I'm certain that it is not a continuous noise - just a single "thunk" or loud click when switching. The mechanical noise it makes when switching has never been a design criteria for me. (we aren't talking about nuclear submarines here;). Thanks for the clarification. _____ From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Speedy11@aol.com Sent: Sunday, February 13, 2011 19:29 Subject: AeroElectric-List: Re: Battery disconnect switch Jeff, What I mean by noisy is 86 dB. That is the noise generated by the device as listed on the Tyco web site. 86 dB, while not immediately damaging to hearing, is very loud and can damage hearing if experienced over time. I wasn't referring to "noise" that would interfere with radio transmissions. 1. I don't know if the noise is continuous. Check with Tyco. 2. My experience with contactors normally used in aircraft is that the only significant noise generated is when the contactor is initially excited and the noise is the mechanical movement rather than an electrical noise. Thus, if the Tyco web site information is correct and if the noise is continuous, then my estimate is that the Tyco device is noisier than traditional solenoids. 3. No. Stan Sutterfield In a message dated 2/13/2011 3:01:45 A.M. Eastern Standard Time, aeroelectric-list@matronics.com writes: Not sure what you mean by noisy. Can you be more specific? 1. Is the noise continuous? 2. Is this device any noisier than the traditional solenoid? 3. Have you done some kind of testing or do you have you worked w/ this device? ________________________________ Message 23 ____________________________________ Time: 08:35:24 PM PST US Subject: AeroElectric-List: No click when pushing PTT From: "N777TY" Just trying to start the troubleshooting of a strange issue I have in my plane. When I push PTT button while COM2 is selected, I don't get that click at the beginning of transmission... The radio transmits just fine.. just doesn't give that click. COM1 works fine. Both are using same PTT button and are wired into the PSE 8000 audio panel. (COM1 is Garmin 530W and COM2 is Garmin 430W) Since the radio works fine it's a somewhat lower priority issue, but it does cause a problem when flying at night... I cannot turn on the runway lights with the second radio because the click isn't there... Tried swapping antenna leads but that didn't help... haven't tried anything else yet.. looking for some ideas.. Thanks! -------- RV-7A N777TY Read this topic online here: http://forums.matronics.com/viewtopic.php?p=330985#330985 ------------------------------------------------------------------------------------- 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.