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nuckollsr(at)cox.net
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 Posted: Sun Nov 26, 2006 6:20 am Post subject: Hugo's antenna questions |
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At 09:08 PM 11/25/2006 -0500, you wrote:
| Quote: |
Hi All,
I 'm installing a Comant antenna in the top cabin of my RV10(composite)it
is a VHF-GPS-Weather data, while I have no problem in doing so in the
metal part ,in the cabin(after I read Bob Nicklaus booK) it looks like I
must install a ground plane inside the cabin.
The book is very fast in explaining,(cut a one inch cooper and weld )
(call 3m for materials) and so on,it does not mention the lengths of each
leg nor the diameter of the round plate, does it need to be aluminum or
copper?
|
Radials under an antenna should be the same length as the
antenna itself. For example, If the comm antenna is
23" in height above the skin, the radials under it should
describe a circle (or skeleton of a circle) that has
a radius of 23". Therefore the disk may be of any size
and the radials of any length as long as distance from
tip of a radial measured to the center of the disk is
the same as the height of the antenna.
The disk serves two purposes: Provide a doubler under the
antenna and an radio frequency ground for the antenna. You
can make the disk and radials out of aluminum but you'd
have to rivet the ends of the radials to the disk to get
a good electrical connection. I prefer to use copper or brass.
If you don't need to add structural doubler, the disk
may be quite thin . . . .005" brass shim stock would
work.
When you use copper or brass and make the radials
from copper or brass, one may attach the radials to
the disk by soldering which provides an electrical
connection with great longevity.
In cases were the radials are short (2.6" under
a transponder antenna) then the entire ground plane
can be one solid disk. Here the disk may be aluminum,
brass or copper.
| Quote: | Thanks
The book is very good ,but its still way beyoong me since I don't want to
became an electronic engineer before learning how to build an airplane,
I'm still thinking many builders want to learn how to build a panel
without the necessity of knowing how an alternator is built ,or how many
inches are the quarter wave(watever that means)I thinks the first
technician who will be able to show pictures at what a diode look like and
wich point needs to be solder ,will sale a tons of books,and don't try to
convert every body in master panel designers.
|
The AeroElectric Connection is not an attempt to
convert anyone to anything. It's simply a collection
of simple ideas that offers more than the traditional
"cook books" bur falls far short of making an engineer
out of anyone.
It was crafted with the idea that the informed builder
is the most confident builder both in terms of building
and operating his/her airplane. A great many of our
fellow pilots operate their airplanes much as they do
their cars. The machines are just appliances with knobs,
levers, and fuel tanks. They are competent enough in
operating the machine to get a license but have little
if any knowledge about how it works (and perhaps don't
care).
| Quote: | Its my personal opinion only.
|
If you don't believe you received fair value for
your purchase, just let me know and I'll refund your
money.
Bob . . .
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Deems Davis
Joined: 09 Jan 2006
Posts: 925
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| Posted: Sun Nov 26, 2006 7:27 am Post subject: Hugo's antenna questions |
|
|
Hugo, why have you decided to mount the Com antenna on the top? most of
the transmissions will be between the aircraft and ground based
stations, I believe that most of the RV-10 builders are mounting their
Com antennas on the bottom of the aircraft where they also have the
advantage of the metal skin. FWIW
Deems Davis # 406
Finishing - ( A Misnomer ! )
http://deemsrv10.com/
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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gommone7(at)bellsouth.net
Guest
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| Posted: Sun Nov 26, 2006 9:57 am Post subject: Hugo's antenna questions |
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| Quote: | The commant in the roof is a triple in one ,is my 2nd VHF(#1 is at the bottom ,bend commant),is my GPS and because soon or later I will need WX data it does to.It is very expensive about 750.00 ,but still cheaper if purchase separate ,I was tinking with one in the cabin I will reduce some drag,plus in some unfortunate event something hits the bottom,still have the top one.
hugo
|
| Quote: | From: Deems Davis <deemsdavis(at)cox.net>
Date: 2006/11/26 Sun AM 10:26:01 EST
To: aeroelectric-list(at)matronics.com
Subject: Re: Re: Hugo's antenna questions
Hugo, why have you decided to mount the Com antenna on the top? most of
the transmissions will be between the aircraft and ground based
stations, I believe that most of the RV-10 builders are mounting their
Com antennas on the bottom of the aircraft where they also have the
advantage of the metal skin. FWIW
Deems Davis # 406
Finishing - ( A Misnomer ! )
http://deemsrv10.com/
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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gommone7(at)bellsouth.net
Guest
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| Posted: Sun Nov 26, 2006 10:30 am Post subject: Hugo's antenna questions |
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Thanks for the answer.
Please don't misunderstend me,
the book is great, and I still think you are a real gentleman, the same opinion I have when I talked to you at the time I ordered the book, even if I sound sarcastic (I have the same problem at home with my kids,it runs in my family blood.) You still answered properly ,like every time somebody in the list tries to make you loose yor temper. My only purpose is the positive criticism,I think it is never too late to learn from others,I'm 50 and still probably do not know anything. Being very knowledgeable in some profession does not mean it is easy to be a teacher,you see ,in my opinion when you try to teach somebody with no notion of the subject matter ,you must to go down to their level and start from there ,I hope you don't still missunderstand me ,I wish I can help you in improve the manual, so that the common mortals guys ,who one day decided to build an airplane will be able to manufacture their panels,and I thinks is very easy
Thanks for the help.
Hugo Terrosa
Ps. If you need a manual ,you must purchase one,because I don't think I'll be sending mine back.
| Quote: |
From: "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>
Date: 2006/11/26 Sun AM 09:19:15 EST
To: aeroelectric-list(at)matronics.com
Subject: Re: Hugo's antenna questions
At 09:08 PM 11/25/2006 -0500, you wrote:
>
>
>Hi All,
>I 'm installing a Comant antenna in the top cabin of my RV10(composite)it
>is a VHF-GPS-Weather data, while I have no problem in doing so in the
>metal part ,in the cabin(after I read Bob Nicklaus booK) it looks like I
>must install a ground plane inside the cabin.
>The book is very fast in explaining,(cut a one inch cooper and weld )
>(call 3m for materials) and so on,it does not mention the lengths of each
>leg nor the diameter of the round plate, does it need to be aluminum or
>copper?
Radials under an antenna should be the same length as the
antenna itself. For example, If the comm antenna is
23" in height above the skin, the radials under it should
describe a circle (or skeleton of a circle) that has
a radius of 23". Therefore the disk may be of any size
and the radials of any length as long as distance from
tip of a radial measured to the center of the disk is
the same as the height of the antenna.
The disk serves two purposes: Provide a doubler under the
antenna and an radio frequency ground for the antenna. You
can make the disk and radials out of aluminum but you'd
have to rivet the ends of the radials to the disk to get
a good electrical connection. I prefer to use copper or brass.
If you don't need to add structural doubler, the disk
may be quite thin . . . .005" brass shim stock would
work.
When you use copper or brass and make the radials
from copper or brass, one may attach the radials to
the disk by soldering which provides an electrical
connection with great longevity.
In cases were the radials are short (2.6" under
a transponder antenna) then the entire ground plane
can be one solid disk. Here the disk may be aluminum,
brass or copper.
>Thanks
>The book is very good ,but its still way beyoong me since I don't want to
>became an electronic engineer before learning how to build an airplane,
>I'm still thinking many builders want to learn how to build a panel
>without the necessity of knowing how an alternator is built ,or how many
>inches are the quarter wave(watever that means)I thinks the first
>technician who will be able to show pictures at what a diode look like and
>wich point needs to be solder ,will sale a tons of books,and don't try to
>convert every body in master panel designers.
The AeroElectric Connection is not an attempt to
convert anyone to anything. It's simply a collection
of simple ideas that offers more than the traditional
"cook books" bur falls far short of making an engineer
out of anyone.
It was crafted with the idea that the informed builder
is the most confident builder both in terms of building
and operating his/her airplane. A great many of our
fellow pilots operate their airplanes much as they do
their cars. The machines are just appliances with knobs,
levers, and fuel tanks. They are competent enough in
operating the machine to get a license but have little
if any knowledge about how it works (and perhaps don't
care).
>Its my personal opinion only.
If you don't believe you received fair value for
your purchase, just let me know and I'll refund your
money.
Bob . . .
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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nuckollsr(at)cox.net
Guest
|
| Posted: Sun Nov 26, 2006 11:15 am Post subject: Hugo's antenna questions |
|
|
At 01:30 PM 11/26/2006 -0500, you wrote:
| Quote: |
Thanks for the answer.
Please don't misunderstend me,
the book is great, and I still think you are a real gentleman, the same
opinion I have when I talked to you at the time I ordered the book, even
if I sound sarcastic (I have the same problem at home with my kids,it runs
in my family blood.) You still answered properly ,like every time somebody
in the list tries to make you loose yor temper. My only purpose is the
positive criticism,I think it is never too late to learn from others,I'm
50 and still probably do not know anything. Being very knowledgeable in
some profession does not mean it is easy to be a teacher,you see ,in my
opinion when you try to teach somebody with no notion of the subject
matter ,you must to go down to their level and start from there ,I hope
you don't still missunderstand me ,I wish I can help you in improve the
manual, so that the common mortals guys ,who one day decided to build an
airplane will be able to manufacture their panels,and I thinks is very easy
Thanks for the help.
Hugo Terrosa
|
Not at all sir. I'm just making sure that 1300 or so other folks
on the List understand too!
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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