Today's Message Index:
----------------------
1. 05:28 AM - Re: Electronic Ignition spark advance signal boost (andymeyer)
2. 07:03 AM - Re: VHF antenna in the tail (user9253)
3. 07:05 AM - Re: VHF antenna in the tail (GTH)
4. 07:17 AM - Re: VHF antenna in the tail (Robert L. Nuckolls, III)
5. 07:26 AM - Re: Re: VHF antenna in the tail (Charlie England)
6. 07:26 AM - Re: VHF antenna in the tail (Charlie England)
7. 07:44 AM - Re: VHF antenna in the tail (Charlie England)
8. 09:07 AM - Re: VHF antenna in the tail (user9253)
9. 01:51 PM - Re: VHF antenna in the tail (Peter Pengilly)
10. 01:55 PM - Re: VHF antenna in the tail (Peter Pengilly)
11. 07:10 PM - Re: Electronic Ignition spark advance signal boost (Airdog77)
12. 10:07 PM - Re: Re: VHF antenna in the tail (Neal George)
13. 10:14 PM - Re: Re: VHF antenna in the tail (Bill Maxwell)
14. 10:45 PM - Re: Re: VHF antenna in the tail (Bill Maxwell)
Message 1
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| Subject: | Re: Electronic Ignition spark advance signal boost |
I'm feeding data to an Arduino SAMD21 from a Lightspeed Plasma 3 ignition... The
SAMD21 will be in back by the engine (Long EZ) with a KTA259 EGT/CHT thermocouple
sensor - the Lightspeed is about 5 feet of cable away. I was going to put
a pair of 623's filtered to 1Hz corner next to the Lightspeed (tucked in the
connector if I can) for MP and Timing and simple resistor bridge to drop the
tach digital signal from 10V to 3.3V. A few more signals will go into the rear
module as well.
I've got the UI working for up front and it will get the data from the back via
RS485. Up front, I'm going to add in a few more signals to the display... Possibly
talking to and listening to my GNS430. (Fuel data, groundspeed...)
Eventually once things are working, I'm planning on a first attempt at building
my own boards and 3D printing cases, etc... The KTA259 will be replaced with
8 MAX31855's at that time.
Any thoughts or input would be GREATLY appreciated.
Happy Flyin'!
Andy
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476624#476624
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| Subject: | Re: VHF antenna in the tail |
Make your own copper tape by flatting #12 AWG solid wire using a hammer and anvil.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476625#476625
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| Subject: | Re: VHF antenna in the tail |
/Le 20/12/2017 02:41, GTH a crit :
/
> /
> 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) ?
> /
>
Hi all,
Thank you everyone who responded.
The project is a small airplane with the fin about 800 mm high (~950 mm
leading edge), so space seems a bit limited for a dipole antenna.
Still looking into any solution.
The idea is to design something mostly DIY for cost reasons, so this
seems to rule out off-the-shelf antennas.
Any ideas ?
BTW, what is the influence of the radiating element width/diameter vs
selectivity or else ?
Any hard facts on the subject ?
Thanks for any input,
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
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| Subject: | Re: VHF antenna in the tail |
At 07:41 PM 12/19/2017, you 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.
What does the structure look like ahead of the
tail group? Is there a space behind the seat(s)
but ahead of the tail group that has some
volume?
Bob . . .
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| Subject: | Re: VHF antenna in the tail |
On 12/20/2017 9:02 AM, user9253 wrote:
>
> Make your own copper tape by flatting #12 AWG solid wire using a hammer and
anvil.
>
> --------
> Joe Gores
>
Or, just make it by snipping a 1/2" wide strip from a piece of aluminum
flashing material (~10-15 thousandths" thick). Nothing magic about
copper, for this application.
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| Subject: | Re: VHF antenna in the tail |
On 12/20/2017 9:17 AM, Robert L. Nuckolls, III wrote:
> At 07:41 PM 12/19/2017, you 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.
>
> What does the structure look like ahead of the
> tail group? Is there a space behind the seat(s)
> but ahead of the tail group that has some
> volume?
>
>
> Bob . . .
>
carbon fuselage
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Message 7
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| Subject: | Re: VHF antenna in the tail |
On 12/20/2017 7:50 AM, GTH wrote:
> /Le 20/12/2017 02:41, GTH a crit:
> /
>> /
>> 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) ?
>> /
>>
> Hi all,
>
> Thank you everyone who responded.
> The project is a small airplane with the fin about 800 mm high (~950
> mm leading edge), so space seems a bit limited for a dipole antenna.
> Still looking into any solution.
> The idea is to design something mostly DIY for cost reasons, so this
> seems to rule out off-the-shelf antennas.
> Any ideas ?
>
> BTW, what is the influence of the radiating element width/diameter vs
> selectivity or else ?
> Any hard facts on the subject ?
>
> Thanks for any input,
>
>
> --
> Best regards,
> Gilles
> http://contrails.free.fr
> http://lapierre.skunkworks.free.fr
There have been several good articles in Kitplanes Magazine about the
subject. Short answer: the skinnier the element; the more selective and
'peaky' the gain will be vs frequency. According to stuff I've seen,
1/2" width strip (thickness not too important) seems to be adequate to
reduce selectivity.
The model I linked earlier isn't cheap, but it would probably perform
best. Having said that, once the plane is in the air almost anything
will 'work' as long as it's got a clear shot at its target.
Since you don't have the height to use a dipole, and there isn't a
practical way to have a ground plane for a quarter-wave, have you
considered just using an off the shelf 'rubber ducky' that's made for
handheld comms? Probably be as cheap as making something, and is already
tuned for working without a ground plane. Also rugged enough that you
could make some plastic or fiberglass clips in the tail that it could
just snap into, making any future maintenance simpler.
---
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Message 8
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| Subject: | Re: VHF antenna in the tail |
Since there is not enough room for a dipole, it seems that a quarter wave is required.
Ideally there should be 4 ground plane radials using copper tape. If
there is no access to the inside of the tail, then the ground plane radials could
be glued to the exterior of the tail. If exterior radials are not desired
due to cosmetic concerns, then only one radial could be placed horizontally
in the vertical fin-tail cone junction. Not ideal, but might give adequate performance.
Here is a picture of another homemade option. It is very inexpensive using only
coax. It should work good enough.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476631#476631
Attachments:
http://forums.matronics.com//files/antenna_207.jpg
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| Subject: | VHF antenna in the tail |
http://becker-avionics.info/Products/1a005-2/
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of GTH
Sent: 20 December 2017 01:41
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: | VHF antenna in the tail |
Most modern gliders have a glass fin to house the radio, transponder and Flarm
antennas and some have a carbon rudder, the blanking from the rudder is usually
not a factor. You will obtain much better performance buy buying an antenna
as you will find it difficult to get a good ground plane.
Peter
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of GTH
Sent: 20 December 2017 01:41
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 11
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| Subject: | Re: Electronic Ignition spark advance signal boost |
Bob,
> 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.
I have been in conversation with Electroair. After relaying the info in these
threads on op amps to them, and specifically the AD626, after a day or so of consideration
from them the main feedback I got back was A) the ground from the
controller unit would be the best bet in their opinion, and B) they wanted me
to let them know what comes out of all my efforts on this.
I think I'll press forward with the AD626 with +In (signal) and -In (signal) coming
from the Electroair.
Regards,
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476645#476645
Message 12
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| Subject: | Re: VHF antenna in the tail |
Maybe consider a folded dipole?
Ill have to consult the ARRL Antenna Book...
Neal George
Sent from my iPhone
On Dec 20, 2017, at 11:07 AM, user9253 <fransew@gmail.com> wrote:
Since there is not enough room for a dipole, ...
Message 13
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| Subject: | Re: VHF antenna in the tail |
As I recall, the characteristic impedance of a folded dipole is 200
ohms, so you would probably need a 1:4 balun to feed it from 50 ohm coax?
Bill
On 21/12/2017 5:06 PM, Neal George wrote:
>
> Maybe consider a folded dipole?
> Ill have to consult the ARRL Antenna Book...
>
> Neal George
> Sent from my iPhone
>
> On Dec 20, 2017, at 11:07 AM, user9253 <fransew@gmail.com> wrote:
>
>
> Since there is not enough room for a dipole, ...
>
>
Message 14
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| Subject: | Re: VHF antenna in the tail |
or is it 300 ohms, so 1:6 balun?
On 21/12/2017 5:14 PM, Bill Maxwell wrote:
>
> As I recall, the characteristic impedance of a folded dipole is 200
> ohms, so you would probably need a 1:4 balun to feed it from 50 ohm coax?
>
> Bill
>
>
> On 21/12/2017 5:06 PM, Neal George wrote:
>>
>> Maybe consider a folded dipole?
>> Ill have to consult the ARRL Antenna Book...
>>
>> Neal George
>> Sent from my iPhone
>>
>> On Dec 20, 2017, at 11:07 AM, user9253<fransew@gmail.com> wrote:
>>
>>
>> Since there is not enough room for a dipole, ...
>>
>>
>>
>>
>>
>
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