---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 01/18/14: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:25 AM - Re: Re: ELT Antenna (Robert L. Nuckolls, III) 2. 01:49 PM - Re: parelling two rp3 indicators (Robert L. Nuckolls, III) 3. 01:51 PM - Re: ELT Antenna (Robert L. Nuckolls, III) 4. 07:59 PM - Batteries: Pb Acid -vs- Pb Crystal -vs- LiFePO (Eric Page) ________________________________ Message 1 _____________________________________ Time: 08:25:28 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: ELT Antenna At 07:01 AM 1/16/2014, you wrote: I wrote: I've heard the rumor that some ELT's were triggered by local radiation from a comm transmitter . . . but I've not seen any documentation or FMEA that supported the assertion. ---------------------- I was informed by an astute reader that the ACK E-01 series ELTs were demonstrably plagued with a tendency to trigger in response to on-board COMM transmissions. This fact (and perhaps others like it) may have been the foundation for advising installers to add separation between the ELT and ship's COMM antennas. While the 'fix' is valid, the premise under which the fix is exercised assumes that the ELT was properly qualified to be on the airplane in the first place. Any ELT that goes through the lab where I work would have demonstrated immunity to RF interference many times stronger than the ship's transceivers. The consumer has every reason to expect certain levels of performance in their ELT for it has been decreed and . . . it's a matter of practical utility. With better information, a retraction is in order for my assertion that the RF triggering event was a 'rumor'. At the same time I would advise that compromising the installation of your own 'antenna farm' in recognition of the historical fact is unnecessary. If the ELT you have demonstrates such sensitivity, then there is good reason to suspect a defect in design and/or manufacturing that needs attended to . . . defects that may go beyond the sensitivity to RF. If the ELT is the last bastion of defense for your survival, then offer no quarter in your expectations for its performance. Bob . . . ________________________________ Message 2 _____________________________________ Time: 01:49:32 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: parelling two rp3 indicators At 02:27 PM 1/17/2014, you wrote: >Message for Bob, Ref. this email you sent to me Dec. 22 >2011 Conserning the capasitor on the attached drawing. What >should the specs. be? I'm not up on electronic >ckts. Thanks Bill S. > > A 10uf/16v would be fine . . . it's exceedinly un-critical. http://tinyurl.com/mee3oal Bob . . . ________________________________ Message 3 _____________________________________ Time: 01:51:28 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: ELT Antenna At 07:56 AM 1/17/2014, you wrote: >1/17/2014 > >Hello Bob Nuckolls, You wrote: =9CI've heard the >rumor that some ELT's were triggered by local >radiation from a comm transmitter . . . but >I've not seen any documentation or FMEA that supported the assertion. =9D > >Please let me give you one factual data point on >that issue. I was unable to launch on the first >attempted test flight of my experimental amateur >built KIS TR-1 airplane because every time I >keyed the VHF comm transmitter to talk to either >ground or tower the ACK ELT-01 began to transmit. Thanks for the heads-up! I've found a number of service bulletins against the ELT-01 over it's market life . . . one involved replacement of the g-switch. I'd like to know what the technology is for that switch. Dug around in the patents a bit but didn't find anything. Bob . . . ________________________________ Message 4 _____________________________________ Time: 07:59:39 PM PST US Subject: AeroElectric-List: Batteries: Pb Acid -vs- Pb Crystal -vs- LiFePO From: Eric Page I follow an electronics-related YouTube channel by a South African (recently emigrated to Ohio) gent named Martin Lorton. He posted a video recently in which he talks about some comparison tests he's done of three different battery chemistries. His goal is to identify the best for use as a storage bank for a home solar installation, but I thought his results might be of general interest, particularly given the recent discussions here WRT lightweight LiFePO batteries. The battery discussion runs from 16:55 to 24:50 in the video. http://y2u.be/eQ6m1EVwOAw Eric ------------------------------------------------------------------------------------- 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.