Today's Message Index:
----------------------
1. 10:08 AM - Re: Re: Electronic Ignition spark advance signal boost (Robert L. Nuckolls, III)
2. 12:18 PM - Re: DIY captive stud terminal strips (andymeyer)
3. 12:18 PM - Re: Electronic Ignition spark advance signal boost (andymeyer)
4. 05:41 PM - VHF antenna in the tail (GTH)
5. 05:45 PM - Re: Electronic Ignition spark advance signal boost (Eric Page)
6. 06:55 PM - Re: VHF antenna in the tail (Noel Wade)
7. 06:55 PM - Re: VHF antenna in the tail (Charlie England)
8. 07:00 PM - Re: VHF antenna in the tail (Henador Titzoff)
9. 07:05 PM - Re: VHF antenna in the tail (Henador Titzoff)
10. 08:07 PM - Re: Re: Electronic Ignition spark advance signal boost (Robert L. Nuckolls, III)
11. 09:46 PM - Re: VHF antenna in the tail (Werner Schneider)
Message 1
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| Subject: | Re: Electronic Ignition spark advance signal |
boost
At 10:10 PM 12/18/2017, you wrote:
>
>Hi Ken,
>
>I talked with Electroair earlier today. They are taking a look at
>the AD6262 and the best place to tie in the ground. It doesn't show
>up in the manual and honestly I forgot about it, but on the
>experimental version there is a ground wire coming off the
>Electroair controller unit. Their initial thought is that would be
>the best place to tie in the A626 ground input.
Agreed . . . to a point. The (-) connection of
the AD626 to ElectroAir is a (-)SIGNAL lead paired
with the (+)SIGNAL lead and has nothing in common
with the POWER AND SIGNAL GROUNDS that run from
the AD626 to the EFIS . . . per my corrected diagram
posted last night.
If you're in conversation with anyone at ElectroAir,
it might be useful to forward this message along
with last night's posting to them.
Bob . . .
Message 2
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| Subject: | Re: DIY captive stud terminal strips |
I am looking at a similar application, but was leaning towards the AD623 instead.
IT appears that in the 623, I can reference my output on pin 7 to a ground
of my choosing on pin 8 - a GND that I would tie to my EFIS. A ground that may
be different than that of my ignition system.
The 626 seems to require only one ground on Pin 2. The 626 is nice that I can filter
with one cap, but I think (if I understand this correctly) the different
grounds would be of more benefit and avoid a ground loop in my instrumentation.
I can't find the minimum output voltage (not a datasheet reading guru yet) on the
623 however. My minimum input voltage will go down to about input ground (+/-
.01V). With a 10x multiplier, how low can the 623 output? My Vs will be 3.3V
and Vs- will be the same ground as the input signal.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476612#476612
Message 3
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| Subject: | Re: Electronic Ignition spark advance signal boost |
I am looking at a similar application, but was leaning towards the AD623 instead.
IT appears that in the 623, I can reference my output on pin 7 to a ground
of my choosing on pin 8 - a GND that I would tie to my EFIS. A ground that may
be different than that of my ignition system.
The 626 seems to require only one ground on Pin 2. The 626 is nice that I can filter
with one cap, but I think (if I understand this correctly) the different
grounds would be of more benefit and avoid a ground loop in my instrumentation.
I can't find the minimum output voltage (not a datasheet reading guru yet) on the
623 however. My minimum input voltage will go down to about input ground (+/-
.01V). With a 10x multiplier, how low can the 623 output? My Vs will be 3.3V
and Vs- will be the same ground as the input signal.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476613#476613
Message 4
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| Subject: | VHF antenna in the tail |
Hi all,
My buddy is starting a new ultralight project.
The airframe is carbon fiber (resin infusion) with glass fiber fin to
house a built-in VHF antenna.
On the attached picture of the rear half-fuselage, the glass fin can be
seen, with the carbon fiber tail cone at the base. A small number of
foam ribs will be added.
Question 1 : What would be the lightest and most inexpensive way to
construct an efficient VHF antenna housed in the tail fin ?
Question 2 : Will it be necessary to build a glass fiber rudder, or will
carbon fiber be acceptable (weight concern) ?
Thanks in advance for your inputs, advices, opinions, etc.
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
Message 5
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| Subject: | Re: Electronic Ignition spark advance signal boost |
There doesnt seem to be an explicit specification for minimum output voltage in
the AD623 datasheet, but...
See page 3. In the section on single supply gain error in Table 2, under test
conditions, it shows a minimum output of 50mV for all gain settings.
The AD626 datasheet does explicitly state a minimum output of 30mV (under single
supply output on page 2).
Eric
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476616#476616
Message 6
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| Subject: | Re: VHF antenna in the tail |
Hi,
Putting the antenna in the tail is a common technique used in modern
Sailplanes (which feature mostly carbon-fiber construction) - either the
vertical fin or the rudder is glass. Carbon Fiber won't work at all - it
blocks radio waves in the range that we're interested in.
Can't speak to exactly how you would best construct it, but you want to
look into a Dipole antenna - if you do some Google searching on that you'll
find some info (and Aircraft Spruce also sells one for this kind of
purpose, for a little over $100). They can be made relatively flat and then
bonded (with fiberglass and resin) to the inside of the skin of the tail
(again, assuming the skin is fiberglass and thus transparent to VHF radio
waves).
Good luck,
--Noel
On Tue, Dec 19, 2017 at 5:41 PM, GTH <gilles.thesee@free.fr> wrote:
> Hi all,
>
> My buddy is starting a new ultralight project.
> The airframe is carbon fiber (resin infusion) with glass fiber fin to
> house a built-in VHF antenna.
>
> On the attached picture of the rear half-fuselage, the glass fin can be
> seen, with the carbon fiber tail cone at the base. A small number of foam
> ribs will be added.
>
> Question 1 : What would be the lightest and most inexpensive way to
> construct an efficient VHF antenna housed in the tail fin ?
> Question 2 : Will it be necessary to build a glass fiber rudder, or will
> carbon fiber be acceptable (weight concern) ?
>
> Thanks in advance for your inputs, advices, opinions, etc.
>
> --
> Best regards,
> Gilles
> http://contrails.free.fr
> http://lapierre.skunkworks.free.fr
>
>
Message 7
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| Subject: | Re: VHF antenna in the tail |
On 12/19/2017 7:41 PM, GTH wrote:
> Hi all,
>
> My buddy is starting a new ultralight project.
> The airframe is carbon fiber (resin infusion) with glass fiber fin to
> house a built-in VHF antenna.
>
> On the attached picture of the rear half-fuselage, the glass fin can
> be seen, with the carbon fiber tail cone at the base. A small number
> of foam ribs will be added.
>
> Question 1 : What would be the lightest and most inexpensive way to
> construct an efficient VHF antenna housed in the tail fin ?
> Question 2 : Will it be necessary to build a glass fiber rudder, or
> will carbon fiber be acceptable (weight concern) ?
>
> Thanks in advance for your inputs, advices, opinions, etc.
>
You can make a quarter wave antenna using copper foil (think back to the
old glass-break stripes on windows before solid state glass break
detectors), but physical strength is virtually zero, and would require
somewhat elaborate measures to protect it from breakage. It also would
need a ground plane, and I wouldn't be confident that a carbon fuselage
could provide it.
Same technique is possible making a dipole, but would require close to 4
feet of height.
How about this?
http://www.chiefaircraft.com/sa-006.html
A carbon rudder would no doubt affect it, but by how much; who can tell?
The effect might be only measurable on an antenna range with test gear.
---
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Message 8
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| Subject: | Re: VHF antenna in the tail |
Gilles,
A dipole antenna is the perfect antenna for VHF comm on a composite airplan
e.=C2- You just cut the VHF antenna to the mid-frequency range.=C2- It
is a half-wave length long, so cut it to the mid-range wavelength size. Con
struct the antenna with two copper tape pieces. both totaling the mid-range
wavelength.=C2- The RF cable should come in at the middle of the two pie
ces.=C2- Center conductor to one tape piece, and shield to the other.=C2
- I would put the copper tapes at the fin leading edge and have the cable
go toward the back and down.=C2- You could do it vice-versa, but the rud
der hinges may interfere with the RF environment.=C2- Try to get the thic
kest copper tape as thicker makes the antenna more broadband.=C2- You can
test the antenna before glassing it in with a SWR meter attached to the ra
dio side of the cable.=C2- Find an amateur radio person somewhere.=C2-
Most of them have SWR meters.
I would not recommend a carbon fiber rudder, as it will introduce a conduct
ing surface that will interfere with the antenna.=C2-Henador Titzoff
From: GTH <gilles.thesee@free.fr>
To: aeroelectric-list@matronics.com
Sent: Tuesday, December 19, 2017 9:05 PM
Subject: AeroElectric-List: VHF antenna in the tail
Hi all,
My buddy is starting a new ultralight project.
The airframe is carbon fiber (resin infusion) with glass fiber fin to
house a built-in VHF antenna.
On the attached picture of the rear half-fuselage, the glass fin can be
seen, with the carbon fiber tail cone at the base. A small number of
foam ribs will be added.
Question 1 : What would be the lightest and most inexpensive way to
construct an efficient VHF antenna housed in the tail fin ?
Question 2 : Will it be necessary to build a glass fiber rudder, or will
carbon fiber be acceptable (weight concern) ?
Thanks in advance for your inputs, advices, opinions, etc.
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
Message 9
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| Subject: | Re: VHF antenna in the tail |
Gilles,
A dipole antenna is the perfect antenna for VHF comm on a composite airplan
e.=C2- You just cut the VHF antenna to the mid-frequency range.=C2- It
is a half-wave length long, so cut it to the mid-range wavelength size. Con
struct the antenna with two copper tape pieces. both totaling the mid-range
wavelength.=C2- The RF cable should come in at the middle of the two pie
ces.=C2- Center conductor to one tape piece, and shield to the other.=C2
- I would put the copper tapes at the fin leading edge and have the cable
go toward the back and down.=C2- You could do it vice-versa, but the rud
der hinges may interfere with the RF environment.=C2- Try to get the thic
kest copper tape as thicker makes the antenna more broadband.=C2- You can
test the antenna before glassing it in with a SWR meter attached to the ra
dio side of the cable.=C2- Find an amateur radio person somewhere.=C2-
Most of them have SWR meters.
I would not recommend a carbon fiber rudder, as it will introduce a conduct
ing surface that will interfere with the antenna.=C2-Henador Titzoff
From: GTH <gilles.thesee@free.fr>
To: aeroelectric-list@matronics.com
Sent: Tuesday, December 19, 2017 9:05 PM
Subject: AeroElectric-List: VHF antenna in the tail
Hi all,
My buddy is starting a new ultralight project.
The airframe is carbon fiber (resin infusion) with glass fiber fin to
house a built-in VHF antenna.
On the attached picture of the rear half-fuselage, the glass fin can be
seen, with the carbon fiber tail cone at the base. A small number of
foam ribs will be added.
Question 1 : What would be the lightest and most inexpensive way to
construct an efficient VHF antenna housed in the tail fin ?
Question 2 : Will it be necessary to build a glass fiber rudder, or will
carbon fiber be acceptable (weight concern) ?
Thanks in advance for your inputs, advices, opinions, etc.
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
Message 10
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| Subject: | Re: Electronic Ignition spark advance signal |
boost
At 02:18 PM 12/19/2017, you wrote:
>
>I am looking at a similar application, but was leaning towards the
>AD623 instead. IT appears that in the 623, I can reference my output
>on pin 7 to a ground of my choosing on pin 8 - a GND that I would
>tie to my EFIS. A ground that may be different than that of my
>ignition system.
>
>The 626 seems to require only one ground on Pin 2. The 626 is nice
>that I can filter with one cap, but I think (if I understand this
>correctly) the different grounds would be of more benefit and avoid
>a ground loop in my instrumentation.
>
>I can't find the minimum output voltage (not a datasheet reading
>guru yet) on the 623 however. My minimum input voltage will go down
>to about input ground (+/- .01V). With a 10x multiplier, how low
>can the 623 output? My Vs will be 3.3V and Vs- will be the same
>ground as the input signal.
The 623 is an instrumentation amplifier with
rail-to-rail output capability . . . but much
smaller common mode range.
However, it is suited to your task if you don't
mind adding a few more components around it.
I'm up to my fanny in alligators tonight and in
the morning, but I can calculate and sketch
an option which I'll post tomorrow sometime.
Bob . . .
Message 11
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| Subject: | Re: VHF antenna in the tail |
Gilles,
I did use a ADVANCED AIRCRAFT ELECTRONICS, INC. antenna in my Glastar
below the baggage floor as a NAV antenna, as I removed the NAV (8.33
upgrade) it would be available, I'm based in Switzerland. it is a 5T
model and I was very satisfied on its usage, length is about 110 cm.
See:
http://www.advancedaircraft.com/#models
http://www.aircraftspruce.com/catalog/graphics/vhf5dia.jpg
Cheers Werner
On 20.12.2017 02:41, GTH wrote:
> Hi all,
>
> My buddy is starting a new ultralight project.
> The airframe is carbon fiber (resin infusion) with glass fiber fin to
> house a built-in VHF antenna.
>
> On the attached picture of the rear half-fuselage, the glass fin can be
> seen, with the carbon fiber tail cone at the base. A small number of
> foam ribs will be added.
>
> Question 1 : What would be the lightest and most inexpensive way to
> construct an efficient VHF antenna housed in the tail fin ?
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