---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 04/24/08: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:41 AM - Re: ELT Antenna for Fiberglass aircraft () 2. 09:23 AM - Re: Re: Brownout Battery System P.S. (Robert L. Nuckolls, III) 3. 09:36 AM - navaid devices (Bill and Marsha) 4. 09:36 AM - Re: Hope someone can point me in the right direction for troubleshooting. (Robert L. Nuckolls, III) 5. 04:47 PM - Mechanical question (John Swartout) 6. 05:47 PM - Re: Mechanical question (Ron Shannon) 7. 05:58 PM - Re: Mechanical question (Ron Shannon) 8. 06:10 PM - Re: Mechanical question (Jim) ________________________________ Message 1 _____________________________________ Time: 07:41:44 AM PST US Subject: RE: AeroElectric-List: ELT Antenna for Fiberglass aircraft From: Thanks Bob et al, I'll be using 121.5 until someone with a badge walks up to me and says otherwise. The Morris loop looks like a great option in the < 125 range. Glenn -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: Wednesday, April 23, 2008 9:48 AM Subject: RE: AeroElectric-List: ELT Antenna for Fiberglass aircraft --> At 10:43 PM 4/22/2008 -0400, you wrote: > >Thanks for the feedback. I found two options at >http://www.wingsandwheels.com/page14.htm One option is to attach a >surface mount BNC connector, add a simple ground plane over the top and >stick on a rubber duck. The fancy option is $108.00 > >Glenn A rubber duck for VHF hand held is optimized for VHF and has no specified/controlled performance at 406 Mhz. One can only guess at the Artex ELT product but one would like to believe that a qualified ELT product includes a multi-frequency antenna. If you're willing to go the VHF comm antenna route, then consider the Morris loop described at: http://aeroelectric.com/articles/Morris_Com_Loop_Antenna.pdf This will out-perform a 125 Mhz optimized rubber duck at all frequencies of interest for ELT performance. Bob . . . ________________________________ Message 2 _____________________________________ Time: 09:23:59 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Brownout Battery System P.S. At 10:22 AM 4/23/2008 -0700, you wrote: > > >Bob, > > I looked at your Z13-8B(BrownOutBattery).pdf. It seems to me >that the only reason not to hook a battery like the Panasonic LC-R127R2P >directly to the endurance bus and do away with the brown-out >battery relay, alternate feed relay and the E-bus alternate feed switch >is that the battery won't charge properly through the diode >connecting the main bus to the endurance bus. However, what if you use >a shottky diode for the main bus/endurance bus connection? You always need the alternate feed relay (or switch). You don't want to leave the e-bus hot when the airplane is parked. You also need a way to pre-flight the normal feedpath. > The power shottky on the Perihelion Design site apparently has about >0.2v forward drop. The Panasonic spec sheet you pointed to says, if I >read it right, that the battery needs 13.6-13.8 v terminal voltage to trickle >charge. So the brown-out battery should stay charged OK if the alternator >is regulated to supply more than 14.0 v, which I understand it has to do to >keep the main battery charged. The Shottky diode is alluring . . . but it needs to be insulated from ground and perhaps heat-sinked. It's also probably more expensive than the plastic cube relay. Having said that, since the brown-out battery is not needed to bolster capacity and is only expected to carry a load for tens of milliseonds per flight cycle, then the diode is certainly an option. Diode isolation would be the architecture of choice for the capacitor based brown-out technique discussed in the earlier post. But in either case, the alternate feedpath switch/relay is called for. > Am I missing something simple (or subtle) that makes this not work or >a bad idea? Keep in mind that during battery only operations, this same diode would be in series with a voltage source that is already depressed below 'normal' bus voltage. What you propose would probably function at some level. But for the moment, I'll have to continue to champion hard-closed contacts of relays and switches as being more efficient and lower cost of ownership without impacting system reliability. Now, a Shottky diode in the normal feedpath is certainly an option. But the "advantage" of lower voltage drop looses its luster . . . while the alternator is running you have watts-to-burn. So I'll suggest that the selection of this diode should include considerations of cost and convenience in mounting. Bob . . . ________________________________ Message 3 _____________________________________ Time: 09:36:00 AM PST US From: "Bill and Marsha" Subject: AeroElectric-List: navaid devices I just learned that as of yesterday Navaid Devices has closed their doors. Anyone have any more info? ________________________________ Message 4 _____________________________________ Time: 09:36:00 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Hope someone can point me in the right direction for troubleshooting. At 11:10 PM 4/23/2008 -0400, you wrote: > I have come upon a problem. My plane is wired per Z-19 with two > batteries. Everything has been working fine. A couple of days ago, I > started the installation of my radios. To do so, I had to lean my panel > forward to gain access to the back. > >When I next started the engine, I could hear what sounded like a loose >strap blowing and hitting against the bottom of the plane. I have since >found that this sound is caused by one of the solenoids making a clicking >noise. This sound would go away if I turned the alternator off, but the >alternator was outputting power when it was on. The next day, I found >that I could not get the alternator to output power at all. But&the >clicking sound was gone! > >I removed both the alternator and voltage regulator and had them >checked. Both are working&Just not on my plane! > >I am suspicious that I either have a hot wire loose or a ground has come >off. Does it sound to any of you like this could be the problem? > >I will check for that tomorrow, but then I will be completely out of ideas >as to what to try. > > >Maybe someone can help here? You're faced with the classic troubleshooting problem. There are lots of places where a gross disconnect can occur to produce the symptoms you cite. Fortunately it's not an intermittent problem so your aiming at moving target. Sorry I cannot be more specific. Bob . . . ________________________________ Message 5 _____________________________________ Time: 04:47:51 PM PST US From: John Swartout Subject: AeroElectric-List: Mechanical question Does anyone have a nice, elegant method for mounting on a flat surface the in-line automotive-type fuse-holder sold by B&C? It has no built-in mounting tab or any such thing. Thanks. ________________________________ Message 6 _____________________________________ Time: 05:47:36 PM PST US From: "Ron Shannon" Subject: Re: AeroElectric-List: Mechanical question On Thu, Apr 24, 2008 at 4:43 PM, John Swartout wrote: > jgswartout@earthlink.net> > > > Does anyone have a nice, elegant method for mounting on a flat surface the > in-line automotive-type fuse-holder sold by B&C? It has no built-in > mounting tab or any such thing. > If you're referring to B&C's "HFB" inline yellow fuse holder, an MS21919-WDG11 "Adel" clamp works well -- nice and snug --on the one end where there's space for it. Ron ________________________________ Message 7 _____________________________________ Time: 05:58:21 PM PST US From: "Ron Shannon" Subject: Re: AeroElectric-List: Mechanical question On Thu, Apr 24, 2008 at 5:43 PM, Ron Shannon wrote: > On Thu, Apr 24, 2008 at 4:43 PM, John Swartout > wrote: > >> jgswartout@earthlink.net> >> >> >> Does anyone have a nice, elegant method for mounting on a flat surface the >> in-line automotive-type fuse-holder sold by B&C? It has no built-in >> mounting tab or any such thing. >> > > If you're referring to B&C's "HFB" inline yellow fuse holder, an > MS21919-WDG11 "Adel" clamp works well -- nice and snug --on the one end > where there's space for it. > > Ron > You're probably referring instead to the black blade-style fuse holder (IFH-2) though. You can put a black cable "zip" tie around the base (circle parallel to the wire) attached to a stick-on nylon zip tie holder. The holder will keep it off the surface a bit which aids access to the fuse. Not super "elegant", but it works. Ron ________________________________ Message 8 _____________________________________ Time: 06:10:33 PM PST US From: "Jim" Subject: Re: AeroElectric-List: Mechanical question John, The Buss fuse holders that I used had recessed holes suitable for number 8 machine screws. The local hardware store aircraft section supplied screws of correct length. Jim in Kelowna ----- Original Message ----- From: "John Swartout" Sent: Thursday, April 24, 2008 4:43 PM Subject: AeroElectric-List: Mechanical question > > > > Does anyone have a nice, elegant method for mounting on a flat surface the > in-line automotive-type fuse-holder sold by B&C? It has no built-in > mounting tab or any such thing. > > Thanks. > > > -- > Checked by AVG. > 7:24 AM > > ------------------------------------------------------------------------------------- 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.