Today's Message Index:
----------------------
1. 05:03 AM - Re: VHF antenna in the tail (GTH)
2. 06:29 AM - Re: VHF antenna in the tail (user9253)
3. 06:55 AM - Re: VHF antenna in the tail (Roger)
4. 07:59 AM - Re: VHF antenna in the tail (Charlie England)
5. 08:13 AM - =?utf-8?B?4pyIUmU6IEFpcmxpbmVzIEZvciBBbWVyaWNh? (Durant DaSilva)
6. 09:07 AM - Engine Sensors to Arduino... (andymeyer)
7. 11:19 AM - Re: Engine Sensors to Arduino... (Alec Myers)
8. 12:06 PM - Re: Engine Sensors to Arduino... (andymeyer)
9. 01:52 PM - Re: Re: Engine Sensors to Arduino... (Alec Myers)
10. 08:43 PM - Re: Constructing an automatic RCA video camera feed splitter (Eric Page)
11. 09:06 PM - Re: Constructing an automatic RCA video camera feed splitter (Airdog77)
12. 09:18 PM - Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= Slump =?ISO-8859-1?Q?Eliminator=9D? (Eric Page)
Message 1
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| Subject: | Re: VHF antenna in the tail |
/Robert L. Nuckolls, III a crit :
/
> /
> Can you describe the physical configuration of
> the vertical fin vis-a-vis the empennage? Is
> the vertical fin detachable?/
Hi Bob,
Thank you for responding.
The vertical fin is integral with the fuselage, which comes as two
halves bonded together along the vertical plane of symmetry, like a
plastic model.
The whole airframe is carbon, except the vertical fin which is made of
glass.
Hope the included picture taken some days ago is getting through.
> /
> I presume the antenna, once installed, will
> forever more be inaccessible for tweeking? /
The antenna istself will be enclosed in the vertical fin.
We'll have some access by crawling in the fuselage up to "some distance"
from the fin base.
Also there will be a removable aft tail-cone to give some access to the
control linkage in the tail and -hopefully- to the antenna connection.
Depending on the details, we might be able to make the antenna removable
by sliding it into a plastic tube installed in the tail ?
Thanks for your advice,
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
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| Subject: | Re: VHF antenna in the tail |
If there is access to the inside of the tail cone, then put the ground plane inside.
It can either be a large sheet of thin metal, or else radials made from
wire or metallic tape. The fore and aft radials can be horizontal. The left
and right radials can follow the curved tail skin.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476700#476700
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| Subject: | VHF antenna in the tail |
I noticed that the inside of the fuselage is black. Is it carbon fiber or
is that just a layer of black poly?
Roger
From: GTH
Sent: Saturday, December 23, 2017 8:06 AM
Subject: Re: AeroElectric-List: VHF antenna in the tail
Robert L. Nuckolls, III a =C3=A9crit=C2-:
=C2- Can you describe the physical configuration of
=C2- the vertical fin vis-a-vis the empennage? Is
=C2- the vertical fin detachable?
Hi Bob,
Thank you for responding.
The vertical fin is integral with the fuselage, which comes as two halves b
onded together along the vertical plane of symmetry, like a plastic model.
The whole airframe is carbon, except the vertical fin which is made of glas
s.
Hope the included picture taken some days ago is getting through.
=C2- I presume the antenna, once installed, will
=C2- forever more be inaccessible for tweeking?=C2-
The antenna istself will be enclosed in the vertical fin.
We'll have some access by crawling in the fuselage up to "some distance" fr
om the fin base.
Also there will be a removable aft tail-cone to give some access to the con
trol linkage in the tail and -hopefully- to the antenna connection.
Depending on the details, we might be able to make the antenna removable by
sliding it into a plastic tube installed in the tail ?
Thanks for your advice,
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
Message 4
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| Subject: | Re: VHF antenna in the tail |
Answered in the post to which you responded....
:-)
On 12/23/2017 8:55 AM, Roger wrote:
>
> I noticed that the inside of the fuselage is black. Is it carbon
> fiber or is that just a layer of black poly?
>
> Roger
>
> *From: *GTH <mailto:gilles.thesee@free.fr>
> *Sent: *Saturday, December 23, 2017 8:06 AM
> *To: *aeroelectric-list@matronics.com
> <mailto:aeroelectric-list@matronics.com>
> *Subject: *Re: AeroElectric-List: VHF antenna in the tail
>
> /Robert L. Nuckolls, III a crit:/
>
> /
> Can you describe the physical configuration of
> the vertical fin vis-a-vis the empennage? Is
> the vertical fin detachable?/
>
>
> Hi Bob,
>
> Thank you for responding.
> The vertical fin is integral with the fuselage, which comes as two
> halves bonded together along the vertical plane of symmetry, like a
> plastic model.
> The whole airframe is carbon, except the vertical fin which is made of
> glass.
>
> Hope the included picture taken some days ago is getting through.
>
> cid:part1.B2F783AE.59E84245@free.fr
>
>
> /
> I presume the antenna, once installed, will
> forever more be inaccessible for tweeking? /
>
>
> The antenna istself will be enclosed in the vertical fin.
> We'll have some access by crawling in the fuselage up to "some
> distance" from the fin base.
> Also there will be a removable aft tail-cone to give some access to
> the control linkage in the tail and -hopefully- to the antenna connection.
>
> Depending on the details, we might be able to make the antenna
> removable by sliding it into a plastic tube installed in the tail ?
>
> Thanks for your advice,
>
> --
> Best regards,
> Gilles
> http://contrails.free.fr
> http://lapierre.skunkworks.free.fr
>
---
This email has been checked for viruses by Avast antivirus software.
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Message 6
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| Subject: | Engine Sensors to Arduino... |
I'm in the process of putting together a data collector for my O-235 in my Long
EZ... I've got the 8 thermocouples set up and working via a KTA259k shield and
a Sparkfun SAMD21 Mini board. I'll end up building a board with 8 MAX31855's
in the near future for faster data.
I'm also reading Manifold press, Timing and RPM from a Lightspeed ignition and
Oil press and Temp from the installed engine sensors.
Loop is a continuity loop - the other side of the circuit has a 10k resistor to
ground... If the loop is open, the circuit will go high. If the loop is shorted,
it'll go low, and if all is normal, it'll hover about in the middle.
I'm just looking for a quick review of the circuits to make sure I'm close before
I start burning fingertips. For the MP and timing, I'm thinking a 2Hz filter
in hardware. The RPM is a 15ms 10V pulse - 2 per rev (with a zener for protection
and a little filtering to clean up noise). The oil pressure is a 5 volt
sensor (5->3.3v divider with zener protection) and the Oil Temp is a low resistance
sensor from a Westach oil pressure gauge. I understand that a 220Ohm resistor
is about right with these.
The Arduino is a 3.3v flavor.
Any suggestions for improvements in values or circuit designs before I change my
fingerprints (again.) :)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476704#476704
Attachments:
http://forums.matronics.com//files/rearcircuits2_714.png
http://forums.matronics.com//files/rearcircuits1_139.png
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| Subject: | Re: Engine Sensors to Arduino... |
Why not do your 2Hz filtering in software?
Unless you need a quite specific frequency response you can do a simple but effective
exponential filter, with this in your main loop:
filteredValue = e * sample + (1-e) * filteredValue
choose appropriate value of e to achieve the smoothing you want according to how
often the loop cycles.
On Dec 23, 2017, at 12:07, andymeyer <ameyer@mil-amax.com> wrote:
I'm in the process of putting together a data collector for my O-235 in my Long
EZ... I've got the 8 thermocouples set up and working via a KTA259k shield and
a Sparkfun SAMD21 Mini board. I'll end up building a board with 8 MAX31855's
in the near future for faster data.
I'm also reading Manifold press, Timing and RPM from a Lightspeed ignition and
Oil press and Temp from the installed engine sensors.
Loop is a continuity loop - the other side of the circuit has a 10k resistor to
ground... If the loop is open, the circuit will go high. If the loop is shorted,
it'll go low, and if all is normal, it'll hover about in the middle.
I'm just looking for a quick review of the circuits to make sure I'm close before
I start burning fingertips. For the MP and timing, I'm thinking a 2Hz filter
in hardware. The RPM is a 15ms 10V pulse - 2 per rev (with a zener for protection
and a little filtering to clean up noise). The oil pressure is a 5 volt
sensor (5->3.3v divider with zener protection) and the Oil Temp is a low resistance
sensor from a Westach oil pressure gauge. I understand that a 220Ohm resistor
is about right with these.
The Arduino is a 3.3v flavor.
Any suggestions for improvements in values or circuit designs before I change my
fingerprints (again.) :)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476704#476704
Attachments:
http://forums.matronics.com//files/rearcircuits2_714.png
http://forums.matronics.com//files/rearcircuits1_139.png
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| Subject: | Re: Engine Sensors to Arduino... |
alec(at)alecmyers.com wrote:
> Why not do your 2Hz filtering in software?
> Unless you need a quite specific frequency response you can do a simple but effective
exponential filter, with this in your main loop:
>
> filteredValue = e * sample + (1-e) * filteredValue
>
> choose appropriate value of e to achieve the smoothing you want according to
how often the loop cycles.
>
My only thought was that the hardware filtering will clean up noise that will get
into the software filtering. It also slows down the requirements for data collection
for the filter... I can sample the Oil press a couple of times a second
and have good data. Or, am I over thinking this?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476709#476709
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| Subject: | Re: Engine Sensors to Arduino... |
Both digital and analog filtering (and digital sampling) are all *huge* topics
with libraries of textbooks devoted to them. So whether youre overthinking this
depends on what kind of results you want, I suppose.
You might want to ask yourself how noisy do you expect your oil pressure sensor
to be? Wheres the noise coming from? What kind of spectrum does the noise have?
What does the real signal under the noise look like? If you want filtering
it does help to know what it is youre trying to filter out and what youre trying
to keep.
Software filtering is easy to adjust, and your Arduino is likely to be sitting
in a loop doing nothing for almost all of its processor cycles, so youve plenty
of processing resource: it probably doesnt cost you more to sample at 5Hz, or
10Hz.
On Dec 23, 2017, at 3:06 PM, andymeyer <ameyer@mil-amax.com> wrote:
alec(at)alecmyers.com wrote:
> Why not do your 2Hz filtering in software?
> Unless you need a quite specific frequency response you can do a simple but effective
exponential filter, with this in your main loop:
>
> filteredValue = e * sample + (1-e) * filteredValue
>
> choose appropriate value of e to achieve the smoothing you want according to
how often the loop cycles.
>
My only thought was that the hardware filtering will clean up noise that will get
into the software filtering. It also slows down the requirements for data collection
for the filter... I can sample the Oil press a couple of times a second
and have good data. Or, am I over thinking this?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476709#476709
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| Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
Project update: A prototype PCB for the video multiplexer is assembled and ready
for programming. I'll mail it to Alec next week so he can test his firmware.
Eric
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476726#476726
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| Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
Eric,
Again, awesome.
I love it when (multiple) plans come together! :)
Cheers,
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476727#476727
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| Subject: | Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= |
Slump =?ISO-8859-1?Q?Eliminator=9D?
I assembled the voltage slump eliminators today and have them ready to ship. I've
sent an email to each of the forum members who asked for one, requesting their
mailing address. If you're one of those people and you didn't see my email,
please check your spam folder. I had requests from Rick Beebe, Joe Gores,
Kenneth Larson and Wade Parton.
Eric
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476730#476730
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