Today's Message Index:
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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
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Subject: | MGL Avionics "Enigma" glass panel, engine monitor and |
moving map
--> AeroElectric-List message posted by: "Craig Payne" <craig@craigandjean.com>
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
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Subject: | Re: MGL Avionics "Enigma" glass panel, engine monitor |
and moving map
--> AeroElectric-List message posted by: Mickey Coggins <mick-matronics@rv8.ch>
> 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
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Subject: | Re: 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
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--> 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
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Subject: | 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
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Subject: | princeton capactive fuel probe |
--> AeroElectric-List message posted by: <bakerocb@cox.net>
Responding to an AeroElectric-List message previously posted by: Mark E
Navratil <czechsix@juno.com>
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
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Subject: | Re: Panasonic LC-RD1217P and Van's Battery Box Misfit |
--> AeroElectric-List message posted by: James H Nelson <rv9jim@juno.com>
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
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Subject: | Re: strobe power/autopilot interference? |
--> AeroElectric-List message posted by: "Jekyll" <rcitjh@aol.com>
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
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Subject: | Re: Panasonic LC-RD1217P and Van's Battery Box Misfit |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 09:44 AM 6/6/2006 -0400, you wrote:
>--> AeroElectric-List message posted by: James H Nelson <rv9jim@juno.com>
>
>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
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Subject: | Re: Iso Amp Testing |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 10:00 PM 6/5/2006 -0700, you wrote:
>--> AeroElectric-List message posted by: Mitchell Faatz <mitch@skybound.com>
>
>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 >
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