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gommone7(at)bellsouth.net
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 Posted: Thu Dec 13, 2007 5:21 am Post subject: Hugo's antenna questions |
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Good morning,I purchase yor electric book about a year ago,I was disappointed at the time,because how technical was write ,I was expect a lot of pictures not electric symbols,I want to build an airplane for my self ,not became a electronic guru,but ,reading and reading ,now I;m start to understand and appreciate the amount of information was in that little package,(and a low cost for the info released),(still thinking need to be more pictorial,(I'm still don;t know how a diode look like,and how need to be conected to the circuit,solder ,crimp ,or?
any way ,I have a dilema ,and until now no body satisfied me with a logical answer,if its not to much a problem I like to ask you,reading yor book I fully understand the work of a thermocouple,but,,, I need to know if the leads from the instrument to the sensor can be cut to fit the rigth length,I mean, if the number one cylinder lead can be longer then the number six,my dilema ,and I can 't found in your explanation ,its will be different or dealy time in the reading ,if the wires are different lengths?hope I was able to explain my question,wo persons from the same company(EFIS) give me different answers.its this an opinion or its a physical law apply?
Thanks for your time
Hugo Terrosa
-------------- Original message ----------------------
From: "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>
| Quote: |
<nuckollsr(at)cox.net>
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 . . .
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retasker(at)optonline.net
Guest
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| Posted: Thu Dec 13, 2007 8:34 am Post subject: Hugo's antenna questions |
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|
You can cut the thermocouple to any length you need. There is no
"delay" in any length since it is a static DC signal. The thermocouple
wire provides a voltage to the instrument that is proportional to the
difference in temperature over the length of the wire. A shorter wire
has a greater temperature gradient per foot but still the same
temperature difference from the source (EGT, CHT, etc.) to the
instrument, so the reading will be the same regardless of length. If
you want more information than you can handle, Google "thermocouple".
Dick Tasker
gommone7(at)bellsouth.net wrote:
| Quote: |
Good morning,I purchase yor electric book about a year ago,I was disappointed at the time,because how technical was write ,I was expect a lot of pictures not electric symbols,I want to build an airplane for my self ,not became a electronic guru,but ,reading and reading ,now I;m start to understand and appreciate the amount of information was in that little package,(and a low cost for the info released),(still thinking need to be more pictorial,(I'm still don;t know how a diode look like,and how need to be conected to the circuit,solder ,crimp ,or?
any way ,I have a dilema ,and until now no body satisfied me with a logical answer,if its not to much a problem I like to ask you,reading yor book I fully understand the work of a thermocouple,but,,, I need to know if the leads from the instrument to the sensor can be cut to fit the rigth length,I mean, if the number one cylinder lead can be longer then the number six,my dilema ,and I can 't found in your explanation ,its will be different or dealy time in the reading ,if the wires are different lengths?hope I was able to explain my question,wo persons from the same company(EFIS) give me different answers.its this an opinion or its a physical law apply?
Thanks for your time
Hugo Terrosa
-------------- Original message ----------------------
From: "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>
>
> <nuckollsr(at)cox.net>
>
> 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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