---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 06/06/06: 10 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:01 AM - MGL Avionics "Enigma" glass panel, engine monitor and moving map (Craig Payne) 2. 12:50 AM - Re: MGL Avionics "Enigma" glass panel, engine monitor and moving map (Mickey Coggins) 3. 03:51 AM - Re: Panasonic LC-RD1217P and Van's Battery Box Misfit (LarryRobertHelming) 4. 04:47 AM - Re: -- Baluns (Hopperdhh@aol.com) 5. 04:53 AM - Re: Panasonic LC-RD1217P and Van's Battery Box Misfit (Alex Peterson) 6. 05:11 AM - princeton capactive fuel probe () 7. 06:52 AM - Re: Panasonic LC-RD1217P and Van's Battery Box Misfit (James H Nelson) 8. 07:15 AM - Re: strobe power/autopilot interference? (Jekyll) 9. 04:48 PM - Re: Panasonic LC-RD1217P and Van's Battery Box Misfit (Robert L. Nuckolls, III) 10. 04:49 PM - Re: Iso Amp Testing (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 12:01:26 AM PST US From: "Craig Payne" Subject: AeroElectric-List: MGL Avionics "Enigma" glass panel, engine monitor and moving map --> AeroElectric-List message posted by: "Craig Payne" They have been hinting at this for a while and just released more data. Based on their previous products (one of which I own) I expect this will be competitively priced: http://www.mglavionics.co.za/enigma.html -- Craig ________________________________ Message 2 _____________________________________ Time: 12:50:29 AM PST US From: Mickey Coggins Subject: Re: AeroElectric-List: MGL Avionics "Enigma" glass panel, engine monitor and moving map --> AeroElectric-List message posted by: Mickey Coggins > They have been hinting at this for a while and just released more data. > Based on their previous products (one of which I own) I expect this will be > competitively priced: > > http://www.mglavionics.co.za/enigma.html Very interesting. The EFIS market is really getting hot. Those of you going to OSH will have to tell the rest of us how this thing looks in real life. -- Mickey Coggins http://www.rv8.ch/ #82007 finishing do not archive ________________________________ Message 3 _____________________________________ Time: 03:51:02 AM PST US From: "LarryRobertHelming" Subject: Re: AeroElectric-List: Panasonic LC-RD1217P and Van's Battery Box Misfit ----- Original Message ----- Subject: AeroElectric-List: Panasonic LC-RD1217P and Van's Battery Box Misfit I just received my new Panasonic battery from Digi-Key per the Nuckolls seminar, and "fit" it into my Firewall Vans Battery Box. It is now jammed half-way in and half-way out. Soaking with Boe-lube has not helped. What is the story on this? Anyone else have a misfit problem like this? I now have two expensive pieces of soon-to-be trash. Mike (((((((((())))))))))) I got the first Panosonic battery to fit into the Van's box by carefully sanding the sides of the battery to reduce its size so it would slid in and back out. Flew with it for about a year. When it was time, I purchased another battery buying the PC680 for which the box was designed and saved lots of work. I found the Panasonic battery had plenty of power to do the job but it just is about 1/16" larger in both width and length than the PC680. You could shim on the box mounts but some sanding would still be needed on the width. My concern was sanding no more than what was needed to not cause the battery case to weaken to the point it would fail. Therefore, sand evenly on each side. Larry in Indiana ________________________________ Message 4 _____________________________________ Time: 04:47:34 AM PST US From: Hopperdhh@aol.com Subject: Re: AeroElectric-List: -- Baluns --> AeroElectric-List message posted by: Hopperdhh@aol.com Bob and others on the list, It is my understanding that the purpose of the balun is mainly to prevent the feed line from distorting the pattern of the antenna. That is, to keep the antenna purely horizontal so that it will be less receptive to reflections from mountains and large buildings for example. When waves reflect off of things they tend to lose the original polarity (horizontal or vertical). The balun isolates the antenna from the feed line and makes it more like a pure horizontal dipole. Having said all of that, I have a dipole attached to the canopy of my RV-7A with NO balun (because I didn't have one handy) and it appears to work just fine. Perhaps it would work even better with the balun! By the way, I experimented with the length using my MFJ-259B Antenna Analyzer looking for the lowest SWR across the 108 to 118 MHz nav band. Start with the antenna long, say cut for 100 MHz and trim to move the SWR higher in frequency. The reason it is necessary to experiment here is that the antenna is not in the clear, and also it is not running straight. The length of an ideal dipole antenna (in feet) is approximately 468/Freq(MHz) from any of the ARRL Handbooks. Hope this helps, Dan Hopper K9WEK In a message dated 6/4/2006 3:48:34 P.M. Eastern Daylight Time, nuckollsr@cox.net writes: http://n-lemma.com/calcs/dipole/balun.htm http://en.wikipedia.org/wiki/Dipole_antenna We used to wire our VOR cat-whiskers on the single engined Cessnas with a balun back in the 60' but gave it up after a series of experiments showed no perceivable difference between antennas with baluns and antennas that simply attached the center conductor to one leg of the dipole and coax braid to the other leg. Some folks believe in slipping ferrite toroidal cores over the coax like this figure from the AeroElectric Connection: http://www.aeroelectric.com/Pictures/Antenna/Dipole_Antenna.pdf However, subsequent to publishing that figure I've done some testing in the lab and found that the ferrite cores offer no observable improvement in VOR receiver or GS receiver performance by their use. Therefore, it's my recommendation that you forgo the use of either balun or ferrite cores and simply attach the legs of your dipole to the center conductor and shield of the coax. Bob . . . ________________________________ Message 5 _____________________________________ Time: 04:53:29 AM PST US From: "Alex Peterson" Subject: RE: AeroElectric-List: Panasonic LC-RD1217P and Van's Battery Box Misfit Probably the other way around - plastics thermally expand and contract much more than aluminum. Try the freezer (although if it is mounted to the plane, it might take a large one). Alex Peterson RV6-A N66AP 758 hours Maple Grove, MN _____ From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of James Freeman Sent: Monday, June 05, 2006 11:33 PM Subject: Re: AeroElectric-List: Panasonic LC-RD1217P and Van's Battery Box Misfit Ouch. I'm guessing that the coefficient of thermal expansive is greater for the box than for the battery. You might try (gently) heating the assembly. On Jun 5, 2006, at 10:59 PM, Michael Ashura wrote: I just received my new Panasonic battery from Digi-Key per the Nuckolls seminar, and "fit" it into my Firewall Vans Battery Box. It is now jammed half-way in and half-way out. Soaking with Boe-lube has not helped. What is the story on this? Anyone else have a misfit problem like this? I now have two expensive pieces of soon-to-be trash. Mike ________________________________ Message 6 _____________________________________ Time: 05:11:01 AM PST US From: Subject: AeroElectric-List: princeton capactive fuel probe --> AeroElectric-List message posted by: Responding to an AeroElectric-List message previously posted by: Mark E Navratil 6/6/2006 Hello Mark, You wrote: <<...... skip...... My only complaint--and it's a minor one--is that with the tanks full, the reading from the senders varies by about a gallon. You can program the EIS to show whatever quantity you want when the sender is at the full level...I measured about 11 gals in my tank when the fuel is at the top of the sender so that's what I programmed into the EIS. But the actual reading after refueling is anywhere from 10.0 to 10.9, and it varies from day to day. I didn't expect capacitive probes to wander in their readings like this. Anyway, the important part is that they do seem to read accurately when near empty.......skip....... --Mark Navratil>> I am reluctant to dip my toe into any electrical waters, but my understanding is that the capacitance probes measure the changing capacitance between the center rod and the outer tube of the probe as the level of fuel changes inside the tube. Fuel and air have different capacitive characteristics. Through electrical magic the system displays this capacitance as fuel quantity. But also the density of fuel can change with changing temperature and this changing density can change the capacitance characteristics of the fuel. So with exactly the same amount of fuel in your tank on two different occasion you could read different fuel quantity depending upon the temperature difference between those two occasions. This could explain the variations in your fuel quantity readings. OC ________________________________ Message 7 _____________________________________ Time: 06:52:16 AM PST US Subject: Re: AeroElectric-List: Panasonic LC-RD1217P and Van's Battery Box Misfit From: James H Nelson --> AeroElectric-List message posted by: James H Nelson Mike, I have the Panasonic battery also and it did the same thing. However, I did not let it get far enough in to not get it out. I am doing the mod that someone on the web to their battery box. They removed the front portion of the box and put steel hinges on each side. By removing the hinge pins, you remove the front cover and remove the battery towards the front. I bought the steel hinge from McMaster Carr (about 3') and cut off what I needed and took what pin length I needed. The pin is about an inch and half longer than the hinge. I flattened the top 1/4" so I can drill it for a safety wire to keep it from moving. Problem solved. Jim Nelson FWF RV9-A ________________________________ Message 8 _____________________________________ Time: 07:15:15 AM PST US Subject: AeroElectric-List: Re: strobe power/autopilot interference? From: "Jekyll" --> AeroElectric-List message posted by: "Jekyll" Erich: I asked TruTrak that very question. Thier email responce was to run the servo wires through the same conduit as all other wing wires, including the strobe. No bad juju will be incurred. Jekyll Read this topic online here: http://forums.matronics.com/viewtopic.php?p=38943#38943 ________________________________ Message 9 _____________________________________ Time: 04:48:20 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Panasonic LC-RD1217P and Van's Battery Box Misfit --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 09:44 AM 6/6/2006 -0400, you wrote: >--> AeroElectric-List message posted by: James H Nelson > >Mike, > I have the Panasonic battery also and it did the same thing. >However, I did not let it get far enough in to not get it out. I am >doing the mod that someone on the web to their battery box. They removed >the front portion of the box and put steel hinges on each side. By >removing the hinge pins, you remove the front cover and remove the >battery towards the front. I bought the steel hinge from McMaster Carr >(about 3') and cut off what I needed and took what pin length I needed. >The pin is about an inch and half longer than the hinge. I flattened the >top 1/4" so I can drill it for a safety wire to keep it from moving. >Problem solved. Jim, could take a picture of your 'mod' next time you have access to it? It would be helpful to publish it on our website. Bob . . . ________________________________ Message 10 ____________________________________ Time: 04:49:04 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Iso Amp Testing --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 10:00 PM 6/5/2006 -0700, you wrote: >--> AeroElectric-List message posted by: Mitchell Faatz > >Bob, > >What is the easiest way to test the iso amp project on the bench? I'd >like to try it out before mounting it in the plane, and I don't have the >radios and audio sources all hooked up in the panel yet. > >Thanks - Mitch I used a bench power supply, audio signal generator, load resistors to simulate headphone and a 'scope. The minimum-equipment method would call for wiring your headphones to the output and use some audio device with a headphone output (portable radio, cd player, etc) to give you a test signal source. You should hear each stereo channel in one headphone only, and the three mono channels in both headphones. Bob . . . --------------------------------------------------------- < What is so wonderful about scientific truth...is that > < the authority which determines whether there can be > < debate or not does not reside in some fraternity of > < scientists; nor is it divine. The authority rests > < with experiment. > < --Lawrence M. Krauss > ---------------------------------------------------------