 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
tutuzulu(at)gmail.com
Guest
|
 Posted: Sun Mar 19, 2006 7:34 am Post subject: MicroAir antenna |
 |
|
My quarter-wave antenna has delrin bushings to insulate the antenna
from the airframe, and Aeroelectric Connection states the antenna
should be insulated from the airframe.
Yet, the manual for my MicroAir 760 radio says "For metal skin
aircraft....ensure that the antenna base and the coax shield are
firmly grounded to the skin of the aircraft. Ensure that any
anti-corrosion product, which may be used to seal the exterior
surface, does not isolate the antenna base from the airframe."
Wouldn't this be the same as grounding the shield wire to the antenna?
How have y'all done it?
See you at Sun'nFun.
--
Bob Miller
601HD N722Z
Charlottesville, Virginia
| | - The Matronics Zenith-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?Zenith-List |
|
|
|
| Back to top |
|
 |
bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
|
| Posted: Sun Mar 19, 2006 6:01 pm Post subject: MicroAir antenna |
|
|
A quarter wave whip antenna needs a good ground plane to operate
effectively. The shield conductor on a quarter wave whip antenna must be
grounded at both ends, on the antenna end it must be grounded to a good
ground plane. Most manufactured antennas have a metal base that the outer
shell of the antenna connector is attatched to. In order to ensure that the
shield is grounded, this metal base must be grounded. The actual radiating
element inside the antenna assembly is connected to the center conductor of
the antenna cable and isolated from the shell. The radiating element must
not be grounded.
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.
| Quote: |
My quarter-wave antenna has delrin bushings to insulate the antenna
from the airframe, and Aeroelectric Connection states the antenna
should be insulated from the airframe.
Yet, the manual for my MicroAir 760 radio says "For metal skin
aircraft....ensure that the antenna base and the coax shield are
firmly grounded to the skin of the aircraft. Ensure that any
anti-corrosion product, which may be used to seal the exterior
surface, does not isolate the antenna base from the airframe."
Wouldn't this be the same as grounding the shield wire to the antenna?
How have y'all done it?
See you at Sun'nFun.
--
Bob Miller
601HD N722Z
Charlottesville, Virginia
|
| | - The Matronics Zenith-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?Zenith-List |
|
_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
|
| Back to top |
|
|
tutuzulu(at)gmail.com
Guest
|
| Posted: Mon Mar 20, 2006 4:34 am Post subject: MicroAir antenna |
|
|
Bryan,
I think this explains the discrepancy. My antenna is a solid piece of
stainless, no outer shell. So I'll insulate this from the airframe,
and ground the coax shield to the groundplane (i.e., the metal skin).
It was the least expensive antenna ACS offered, so we'll see how well
it does. It is similar to the "roll your own" that Aeroelectric
recommends.
Thanks,
Bob
On 3/19/06, Bryan Martin <bryanmmartin(at)comcast.net> wrote:
| Quote: |
A quarter wave whip antenna needs a good ground plane to operate
effectively. The shield conductor on a quarter wave whip antenna must be
grounded at both ends, on the antenna end it must be grounded to a good
ground plane. Most manufactured antennas have a metal base that the outer
shell of the antenna connector is attatched to. In order to ensure that the
shield is grounded, this metal base must be grounded. The actual radiating
element inside the antenna assembly is connected to the center conductor of
the antenna cable and isolated from the shell. The radiating element must
not be grounded.
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.
>
>
> My quarter-wave antenna has delrin bushings to insulate the antenna
> from the airframe, and Aeroelectric Connection states the antenna
> should be insulated from the airframe.
>
> Yet, the manual for my MicroAir 760 radio says "For metal skin
> aircraft....ensure that the antenna base and the coax shield are
> firmly grounded to the skin of the aircraft. Ensure that any
> anti-corrosion product, which may be used to seal the exterior
> surface, does not isolate the antenna base from the airframe."
>
> Wouldn't this be the same as grounding the shield wire to the antenna?
>
> How have y'all done it?
>
> See you at Sun'nFun.
>
> --
> Bob Miller
> 601HD N722Z
> Charlottesville, Virginia
>
>
|
--
Bob Miller
601HD N722Z
Charlottesville, Virginia
| | - The Matronics Zenith-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?Zenith-List |
|
|
|
| Back to top |
|
|
ggower_99(at)yahoo.com
Guest
|
| Posted: Mon Mar 20, 2006 2:30 pm Post subject: MicroAir antenna |
|
|
Bob,
That stainless steel antena comes with two pieces of insulate (cant remember if solid plastic or some kind of ceramic) that insulates the antena from the airframe, then also has a piece of metal that touches the airframe where you conect the ground of the coaxial cable. I have one of this, but installed in other ultralight several years ago, cant remeber exacty, but still working pefectly for about 10 years, as a permanent antena for my handheld radio.
Saludos
Gary Gower.
Bob Miller <tutuzulu(at)gmail.com> wrote:
Bryan,
I think this explains the discrepancy. My antenna is a solid piece of
stainless, no outer shell. So I'll insulate this from the airframe,
and ground the coax shield to the groundplane (i.e., the metal skin).
It was the least expensive antenna ACS offered, so we'll see how well
it does. It is similar to the "roll your own" that Aeroelectric
recommends.
Thanks,
Bob
On 3/19/06, Bryan Martin
wrote:
| Quote: |
A quarter wave whip antenna needs a good ground plane to operate
effectively. The shield conductor on a quarter wave whip antenna must be
grounded at both ends, on the antenna end it must be grounded to a good
ground plane. Most manufactured antennas have a metal base that the outer
shell of the antenna connector is attatched to. In order to ensure that the
shield is grounded, this metal base must be grounded. The actual radiating
element inside the antenna assembly is connected to the center conductor of
the antenna cable and isolated from the shell. The radiating element must
not be grounded.
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.
>
>
> My quarter-wave antenna has delrin bushings to insulate the antenna
> from the airframe, and Aeroelectric Connection states the antenna
> should be insulated from the airframe.
>
> Yet, the manual for my MicroAir 760 radio says "For metal skin
> aircraft....ensure that the antenna base and the coax shield are
> firmly grounded to the skin of the aircraft. Ensure that any
> anti-corrosion product, which may be used to seal the exterior
> surface, does not isolate the antenna base from the airframe."
>
> Wouldn't this be the same as grounding the shield wire to the antenna?
>
> How have y'all done it?
>
> See you at Sun'nFun.
>
> --
> Bob Miller
> 601HD N722Z
> Charlottesville, Virginia
>
>
|
--
Bob Miller
601HD N722Z
Charlottesville, Virginia
---------------------------------
Bring photos to life! New PhotoMail makes sharing a breeze.
| | - The Matronics Zenith-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?Zenith-List |
|
|
|
| Back to top |
|
|
ggower_99(at)yahoo.com
Guest
|
| Posted: Mon Mar 20, 2006 2:30 pm Post subject: MicroAir antenna |
|
|
Bob,
That stainless steel antena comes with two pieces of insulate (cant remember if solid plastic or some kind of ceramic) that insulates the antena from the airframe, then also has a piece of metal that touches the airframe where you conect the ground of the coaxial cable. I have one of this, but installed in other ultralight several years ago, cant remeber exacty, but still working pefectly for about 10 years, as a permanent antena for my handheld radio. Is not expensive, but works great.
Saludos
Gary Gower.
Bob Miller <tutuzulu(at)gmail.com> wrote:
Bryan,
I think this explains the discrepancy. My antenna is a solid piece of
stainless, no outer shell. So I'll insulate this from the airframe,
and ground the coax shield to the groundplane (i.e., the metal skin).
It was the least expensive antenna ACS offered, so we'll see how well
it does. It is similar to the "roll your own" that Aeroelectric
recommends.
Thanks,
Bob
On 3/19/06, Bryan Martin
wrote:
| Quote: |
A quarter wave whip antenna needs a good ground plane to operate
effectively. The shield conductor on a quarter wave whip antenna must be
grounded at both ends, on the antenna end it must be grounded to a good
ground plane. Most manufactured antennas have a metal base that the outer
shell of the antenna connector is attatched to. In order to ensure that the
shield is grounded, this metal base must be grounded. The actual radiating
element inside the antenna assembly is connected to the center conductor of
the antenna cable and isolated from the shell. The radiating element must
not be grounded.
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.
>
>
> My quarter-wave antenna has delrin bushings to insulate the antenna
> from the airframe, and Aeroelectric Connection states the antenna
> should be insulated from the airframe.
>
> Yet, the manual for my MicroAir 760 radio says "For metal skin
> aircraft....ensure that the antenna base and the coax shield are
> firmly grounded to the skin of the aircraft. Ensure that any
> anti-corrosion product, which may be used to seal the exterior
> surface, does not isolate the antenna base from the airframe."
>
> Wouldn't this be the same as grounding the shield wire to the antenna?
>
> How have y'all done it?
>
> See you at Sun'nFun.
>
> --
> Bob Miller
> 601HD N722Z
> Charlottesville, Virginia
|
---------------------------------
| | - The Matronics Zenith-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?Zenith-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
