---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 01/12/15: 12 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:06 AM - Re: Noise Cancelling headphones (danb) 2. 06:16 AM - Re: Re: Noise Cancelling headphones (Kelly McMullen) 3. 07:15 AM - Re: For sale (DeWitt Whittington) 4. 07:33 AM - Re: Re: Noise Cancelling headphones (Vern Little) 5. 07:55 AM - Re: Re: Noise Cancelling headphones (danielj.billingsley@yahoo.com) 6. 08:21 AM - Re: Re: Noise Cancelling headphones (rv7a.builder) 7. 09:47 AM - Re: For sale (Larry Mac Donald) 8. 11:34 AM - Re: For sale (Michael Orth) 9. 01:05 PM - Re: For sale (Larry Mac Donald) 10. 08:08 PM - UN-FUSED MAIN BUS FEEDER (user9253) 11. 09:30 PM - Re: UN-FUSED MAIN BUS FEEDER (Robert L. Nuckolls, III) 12. 09:46 PM - Re: UN-FUSED MAIN BUS FEEDER (Jeff Luckey) ________________________________ Message 1 _____________________________________ Time: 01:06:21 AM PST US Subject: AeroElectric-List: Re: Noise Cancelling headphones From: "danb" John, I recently bought a set of Bose headsets and had a similar thing happen. Oddly enough, I was able to hit the PTT and talk to ground fine, however, when i went to tower and hit the PTT I got a loud squeal. Strange how a different frequency on the radio induces the noise. Anyone have a thought? use a filter? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=436876#436876 ________________________________ Message 2 _____________________________________ Time: 06:16:52 AM PST US From: Kelly McMullen Subject: Re: AeroElectric-List: Re: Noise Cancelling headphones I had that problem with a previous plane, where radio mostly worked fine with lower frequencies, but would squeal with frequencies above say 125.0. Once I put my radio in another aircraft that didn't have problems, it was obvious the problem existed in my airplane outside of the radio. Turned out to be the antenna cable, which was made in the days before crimped connectors were common. On the radio end of the cable there was a cold solder joint on the shield, allowing RF to feedback into the radio. I was given all kinds of theories in trouble shooting, of problems in the radio, problems with the brand headset not having shielded wires, etc. etc. New cable completely eliminated the problem. So I suggest trying a different PTT, try your radio in a different airframe that has same model radio, see if the problem follows the components or not. On 1/12/2015 2:05 AM, danb wrote: > > John, > I recently bought a set of Bose headsets and had a similar thing happen. Oddly enough, I was able to hit the PTT and talk to ground fine, however, when i went to tower and hit the PTT I got a loud squeal. Strange how a different frequency on the radio induces the noise. Anyone have a thought? use a filter? > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=436876#436876 > > ________________________________ Message 3 _____________________________________ Time: 07:15:00 AM PST US Subject: Re: AeroElectric-List: For sale From: DeWitt Whittington Hello Larry, I sent in a bid for a number of items, but never heard from you. I assume you easily sold them all? Dee DeWitt (Dee) Whittington Richmond, VA 804-677-4849 iPhone 804-358-4333 Home On Mon, Dec 8, 2014 at 3:05 PM, Larry Mac Donald wrote: > > I am offering the following aviation tools for sale. > If you are interested, make a reasonable offer. > > Whitney hand punch > Tubing cutter > Hole flanging tool > Seaming tool > Fly-cutter > Micro stop countersink > Aviation snips-left-right & straight > 3X rivet gun > Safety wire twister > Magnetic base protractor > Rivet spacer > Air grinder > Pop rivet tool > Rivet gauges > Cleco pliers > Deburring tool > Countersink > Fluting plier > Bucking bar > Rivet squeezer with 1-1/2 yoke > 3 In. yoke > Pneumatic Rivet squeezer with 1-1/2 in. yoke > Rivet squeezer dies > Dimpleing dies > Blind rivet kit > Air drill > Clecos > Hand seamer > > > ____________________________________________________________ > NetZero now offers 4G mobile broadband. Sign up now. > http://www.netzero.net/?refcd=NZINTISP0512T4GOUT1 > > ________________________________ Message 4 _____________________________________ Time: 07:33:51 AM PST US From: Vern Little Subject: Re: AeroElectric-List: Re: Noise Cancelling headphones Try also taking your headset cord and wrap three turns of it around your han d and secure it with a pair of tie wraps. You've just made an RF choke that may eliminate conduct RF energy into the headset. Vern ===== Vernon R. Little | Chairman, Iris Dynamics Ltd. | President, Vx Aviation > On Jan 12, 2015, at 6:15 AM, Kelly McMullen wrote: > om> > > I had that problem with a previous plane, where radio mostly worked fine w ith lower frequencies, but would squeal with frequencies above say 125.0. On ce I put my radio in another aircraft that didn't have problems, it was obvi ous the problem existed in my airplane outside of the radio. Turned out to b e the antenna cable, which was made in the days before crimped connectors we re common. On the radio end of the cable there was a cold solder joint on th e shield, allowing RF to feedback into the radio. I was given all kinds of t heories in trouble shooting, of problems in the radio, problems with the bra nd headset not having shielded wires, etc. etc. > New cable completely eliminated the problem. > So I suggest trying a different PTT, try your radio in a different airfram e that has same model radio, see if the problem follows the components or no t. >> On 1/12/2015 2:05 AM, danb wrote: >> >> John, >> I recently bought a set of Bose headsets and had a similar thing happen. O ddly enough, I was able to hit the PTT and talk to ground fine, however, whe n i went to tower and hit the PTT I got a loud squeal. Strange how a differe nt frequency on the radio induces the noise. Anyone have a thought? use a fi lter? >> >> >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=436876#436876 > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > > > ________________________________ Message 5 _____________________________________ Time: 07:55:30 AM PST US From: "danielj.billingsley@yahoo.com" Subject: Re: AeroElectric-List: Re: Noise Cancelling headphones Thanks Kelly, that's good =C2-information and gives me something to look at.Dan From: Kelly McMullen To: aeroelectric-list@matronics.com Sent: Monday, January 12, 2015 7:15 AM Subject: Re: AeroElectric-List: Re: Noise Cancelling headphones m I had that problem with a previous plane, where radio mostly worked fine with lower frequencies, but would squeal with frequencies above say 125.0. Once I put my radio in another aircraft that didn't have problems, it was obvious the problem existed in my airplane outside of the radio. Turned out to be the antenna cable, which was made in the days before crimped connectors were common. On the radio end of the cable there was a cold solder joint on the shield, allowing RF to feedback into the radio. I was given all kinds of theories in trouble shooting, of problems in the radio, problems with the brand headset not having shielded wires, etc. etc. New cable completely eliminated the problem. So I suggest trying a different PTT, try your radio in a different airframe that has same model radio, see if the problem follows the components or not. On 1/12/2015 2:05 AM, danb wrote: > > John, > I recently bought a set of Bose headsets and had a similar thing happen. Oddly enough, I was able to hit the PTT and talk to ground fine, however, w hen i went to tower and hit the PTT I got a loud squeal. Strange how a diff erent frequency on the radio induces the noise. Anyone have a thought? use a filter? > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=436876#436876 > > =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin. - S - ________________________________ Message 6 _____________________________________ Time: 08:21:17 AM PST US From: "rv7a.builder" Subject: Re: AeroElectric-List: Re: Noise Cancelling headphones My headsets are plugged into the bulkhead right behind the baggage area in my RV-7A. The thought was to keep the cords out of the way. When I bought t he nose canceling headsets it became difficult to reach the headset control ler(volume, Bluetooth, on/off) so I bought a 5ft extension from Aircraft Sp ruce and I no longer have any squealing? Go Figure? This 5ft extension also allows me to easily unplug my headset if I have to use my handheld as a ba ckup. Previously I would have to=C2-yank the cord from the back bulkhead which I am sure is not a good idea. Thank you guys for all of your input. J ohn=C2- On Monday, January 12, 2015 7:32 AM, Vern Little wrote: Try also taking your headset cord and wrap three turns of it around your h and and secure it with a pair of tie wraps. =C2-You've just made an RF ch oke that may eliminate conduct RF energy into the headset. Vern ======Vernon R. Little | Chairman, Iris Dynamics Ltd. | Preside nt, Vx Aviation On Jan 12, 2015, at 6:15 AM, Kelly McMullen wrote: m> I had that problem with a previous plane, where radio mostly worked fine wi th lower frequencies, but would squeal with frequencies above say 125.0. On ce I put my radio in another aircraft that didn't have problems, it was obv ious the problem existed in my airplane outside of the radio. Turned out to be the antenna cable, which was made in the days before crimped connectors were common. On the radio end of the cable there was a cold solder joint o n the shield, allowing RF to feedback into the radio. I was given all kinds of theories in trouble shooting, of problems in the radio, problems with t he brand headset not having shielded wires, etc. etc. New cable completely eliminated the problem. So I suggest trying a different PTT, try your radio in a different airframe that has same model radio, see if the problem follows the components or no t. On 1/12/2015 2:05 AM, danb wrote: John, I recently bought a set of Bose headsets and had a similar thing happen. Od dly enough, I was able to hit the PTT and talk to ground fine, however, whe n i went to tower and hit the PTT I got a loud squeal. Strange how a differ ent frequency on the radio induces the noise. Anyone have a thought? use a filter? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=436876#436876 www.aeroelectric.cre www.buildersbooks.comnbsp;=C2-=C2-* My Pilot Stor e wwonsulting www.mrrace.com http://www.matronics.com/contribution http://www.matronics.com/Navigator?A eroElectric-List = =C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2 -&nb =C2-=C2---> http://forums.ma============ =============== ________________________________ Message 7 _____________________________________ Time: 09:47:30 AM PST US From: Larry Mac Donald Subject: Re: AeroElectric-List: For sale Dee, Sorry things didn't work out quite that way. First of all i did not receive your bid. Second, that was between december 10th and 15th. and i was starting to feel out of breath around that time. By the 20th i had to check into a Hospital and spent Christmas week there. i was released Christmas eve and have been weak and sleepy ever since. Others have inquired and have asked for photos and i will have to accommodate them as soon as I get the strength to clean and photograph the items. That's where i stand now. When i can get these things done i will get back to you. i'm sorry for the delay. Larry 12, 2015, at 10:13 AM, DeWitt Whittington wrote: > Hello Larry, > > I sent in a bid for a number of items, but never heard from you. I ass ume you easily sold them all? > > Dee > > DeWitt (Dee) Whittington > Richmond, VA > 804-677-4849 iPhone > 804-358-4333 Home > > > On Mon, Dec 8, 2014 at 3:05 PM, Larry Mac Donald wrote: m> > > I am offering the following aviation tools for sale. > If you are interested, make a reasonable offer. > > Whitney hand punch > Tubing cutter > Hole flanging tool > Seaming tool > Fly-cutter > Micro stop countersink > Aviation snips-left-right & straight > 3X rivet gun > Safety wire twister > Magnetic base protractor > Rivet spacer > Air grinder > Pop rivet tool > Rivet gauges > Cleco pliers > Deburring tool > Countersink > Fluting plier > Bucking bar > Rivet squeezer with 1-1/2 yoke > 3 In. yoke > Pneumatic Rivet squeezer with 1-1/2 in. yoke > Rivet squeezer dies > Dimpleing dies > Blind rivet kit > Air drill > Clecos > Hand seamer > > > > ____________________________________________________________ > NetZero now offers 4G mobile broadband. Sign up now. > http://www.netzero.net/?refcd=NZINTISP0512T4GOUT1 > > ========== > br> fts!) > r> > com" target="_blank">www.aeroelectric.com > w.buildersbooks.com" target="_blank">www.buildersbooks.com > p.com" target="_blank">www.homebuilthelp.com > e.com" target="_blank">www.mypilotstore.com > " target="_blank">www.mrrace.com > target="_blank">http://www.matronics.com/contribution > -Matt Dralle, List Admin. > ========== > - > Electric-List" target="_blank">http://www.matronics.com/Navigator?Ae roElectric-List > ========== > FORUMS - > _blank">http://forums.matronics.com > ========== > > > > > > ======================== ============ ======================== ============ ======================== ============ ======================== ============ > > > > ____________________________________________________________ > ____________________________________________________________ The #1 Worst Carb Ever? Click to Learn #1 Carb that Kills Your Blood Sugar (Don't Eat Th is!) http://thirdpartyoffers.juno.com/TGL3141/54b40850c821e8507119st02duc ________________________________ Message 8 _____________________________________ Time: 11:34:40 AM PST US From: "Michael Orth" Subject: Re: AeroElectric-List: For sale >(I) was starting to feel out of breath around that time Larry, Pulmonary embolism? Michael ------------------------------------------------------------------------- ------- ------------------------------------------------------------------------- ------- ----- Original Message ----- From: Larry Mac Donald To: aeroelectric-list@matronics.com Sent: Monday, January 12, 2015 9:45 AM Subject: Re: AeroElectric-List: For sale Dee, Sorry things didn't work out quite that way. First of all i did not receive your bid. Second, that was between december 10th and 15th. and i was starting to feel out of breath around that time. By the 20th i had to check into a Hospital and spent Christmas week there. i was released Christmas eve and have been weak and sleepy ever since. Others have inquired and have asked for photos and i will have to accommodate them as soon as I get the strength to clean and photograph the items. That's where i stand now. When i can get these things done i will get back to you. i'm sorry for the delay. Larry 12, 2015, at 10:13 AM, DeWitt Whittington wrote: Hello Larry, I sent in a bid for a number of items, but never heard from you. I assume you easily sold them all? Dee DeWitt (Dee) Whittington Richmond, VA 804-677-4849 iPhone 804-358-4333 Home On Mon, Dec 8, 2014 at 3:05 PM, Larry Mac Donald wrote: I am offering the following aviation tools for sale. If you are interested, make a reasonable offer. Whitney hand punch Tubing cutter Hole flanging tool Seaming tool Fly-cutter Micro stop countersink Aviation snips-left-right & straight 3X rivet gun Safety wire twister Magnetic base protractor Rivet spacer Air grinder Pop rivet tool Rivet gauges Cleco pliers Deburring tool Countersink Fluting plier Bucking bar Rivet squeezer with 1-1/2 yoke 3 In. yoke Pneumatic Rivet squeezer with 1-1/2 in. yoke Rivet squeezer dies Dimpleing dies Blind rivet kit Air drill Clecos Hand seamer ____________________________________________________________ NetZero now offers 4G mobile broadband. Sign up now. http://www.netzero.net/?refcd=NZINTISP0512T4GOUT1 ========== br> fts!) r> > com" target="_blank">www.aeroelectric.com w.buildersbooks.com" target="_blank">www.buildersbooks.com p.com" target="_blank">www.homebuilthelp.com e.com" target="_blank">www.mypilotstore.com " target="_blank">www.mrrace.com target="_blank">http://www.matronics.com/contribution -Matt Dralle, List Admin. ========== - Electric-List" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List ========== FORUMS - _blank">http://forums.matronics.com ========== href="http://www.aeroelectric.com/">www.aeroelectric.com href="http://www.buildersbooks.com/">www.buildersbooks.com href="http://www.homebuilthelp.com/">www.homebuilthelp.com href="http://www.mypilotstore.com/">www.mypilotstore.com href="http://www.mrrace.com/">www.mrrace.com href="http://www.matronics.com/contribution">http://www.matronics.com/c ontribution href="http://www.matronics.com/Navigator?AeroElectric-List">http://www. matronics.com/Navigator?AeroElectric-List href="http://forums.matronics.com/">http://forums.matronics.com ____________________________________________________________ No virus found in this message. Checked by AVG - www.avg.com 01/12/15 ________________________________ Message 9 _____________________________________ Time: 01:05:52 PM PST US From: Larry Mac Donald Subject: Re: AeroElectric-List: For sale C.O.P.D. plus a cold in the lower throat plus a cold in the upper throat plus all my sinuses infected. Larry On Jan 12, 2015, at 2:32 PM, Michael Orth wrote: > >(I) was starting to feel out of breath around that time > > Larry, > Pulmonary embolism? > Michael ____________________________________________________________ NetZero now offers 4G mobile broadband. Sign up now. http://www.netzero.net/?refcd=NZINTISP0512T4GOUT1 ________________________________ Message 10 ____________________________________ Time: 08:08:46 PM PST US Subject: AeroElectric-List: UN-FUSED MAIN BUS FEEDER From: "user9253" It is common practice not to fuse the main bus feeder between the battery and the main power bus. But what about aircraft with small electrical loads and small feeders? For example, the RV-12 typically uses 10 to 15 amps total. The main feeder is 12 awg per the factory plans. This thread, http://www.vansairforce.com/community/showthread.php?t=120999 is about a fire (while on the ground) that was caused by the main feeder shorting out to the choke cable. Do we need to rethink the practice of not fusing the main power feeder? Or are good wiring practices safe enough? Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=436938#436938 ________________________________ Message 11 ____________________________________ Time: 09:30:27 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: UN-FUSED MAIN BUS FEEDER At 22:07 2015-01-12, you wrote: > >It is common practice not to fuse the main bus feeder between the >battery and the main power bus. But what about aircraft with small >electrical loads and small feeders? For example, the RV-12 >typically uses 10 to 15 amps total. The main feeder is 12 awg per >the factory plans. This thread, >http://www.vansairforce.com/community/showthread.php?t=120999 >is about a fire (while on the ground) that was caused by the main >feeder shorting out to the choke cable. Do we need to rethink the >practice of not fusing the main power feeder? Or are good wiring >practices safe enough? >Joe The FARS speak to the risks for ENGINE CRANKING feeders where bus feeders are on the same order of risk as the cranking circuits. Airplanes that are powered with 'tiny' alternators tend to have bus feeders to match and are at greater risk from battery-fed faults. The thread is extensive and riddled with unclear and/or erroneous words. I'll need to digest it a bit . . . The short answer is that some form of transient tolerant fault protection wouldn't hurt but better installation of the potentially vulnerable wire would be better. So yes, good wiring practices are the first line of defense against such events. The fact that this wire became mechanically compromised speaks to questionable shop practice. I'll sift through the narrative and report back. Watch this space. Bob . . . ________________________________ Message 12 ____________________________________ Time: 09:46:34 PM PST US From: Jeff Luckey Subject: Re: AeroElectric-List: UN-FUSED MAIN BUS FEEDER Joe, Thanks for bringing this to our attention. Very scary and very interesting. A poster on the VansAirforce forum states that the RV-12 is "certified" under an ASTM standard. I found this: ASTM F2245 - 14. Standard Specification for Design and Performance of a Light Sport Airplane. http://www.astm.org/Standards/F2245.htm The abstract for that document suggests that it discusses electrical systems. I would like to get a look at that document but I'm hesitant to spend $60 just for a look-see. Does anyone have a copy of that document that I could look at? Has anyone on this forum seen/read that document and would care to comment on it. Back to the VansAirforce post - The original poster did not post any pictures of the before & after. That's a shame because it might be very instructive if we could see how that feeder was routed. -Jeff PS - As long-time members of this forum may recall, I have been a proponent of protecting all feeders and my designs incorporate such protection. This current (no pun intended) issue is a good example of why. If this fire had occurred while airborne the results could have been catastrophic. On Monday, January 12, 2015 8:24 PM, user9253 wrote: It is common practice not to fuse the main bus feeder between the battery and the main power bus. But what about aircraft with small electrical loads and small feeders? For example, the RV-12 typically uses 10 to 15 amps total. The main feeder is 12 awg per the factory plans. This thread, http://www.vansairforce.com/community/showthread.php?t=120999 is about a fire (while on the ground) that was caused by the main feeder shorting out to the choke cable. Do we need to rethink the practice of not fusing the main power feeder? Or are good wiring practices safe enough? Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=436938#436938 ------------------------------------------------------------------------------------- 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.