 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
|
 Posted: Tue Feb 24, 2009 7:44 am Post subject: Antennas for Europas |
 |
|
Hi,
Frans Veldman did a superb job of explaining the practicality of the
half-wave dipole in particular for a Europa because of its great vertical
fin area.
As he said, the 'gain' attributed to other forms is always at the
cost of overall effectiveness where contact with ground stations is a
concern. The flashlight ( 'torch) is the perfect example. It doesn't light
up areas behind it very well, but the forward gain is excellent.
Perhaps another antenna could be a fullwave circular wire inside the
aft fuselage and fed at the fuselage join halfway up, but then you'd need to
point the Europa to fire ahead or behind.
Thanks, Frans
Ferg
| | - The Matronics Europa-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?Europa-List |
|
| Description: |
|
Download |
| Filename: |
winmail.dat |
| Filesize: |
7.87 KB |
| Downloaded: |
230 Time(s) |
|
|
| Back to top |
|
 |
Rowland_Carson
Joined: 04 Jul 2008
Posts: 155
Location: Cheltenham, England
|
| Posted: Tue Feb 24, 2009 9:52 am Post subject: Antennas for Europas |
|
|
At 2009-02-24 10:42 -0500 Fergus Kyle wrote:
| Quote: | Perhaps another antenna could be a fullwave circular wire inside the
aft fuselage and fed at the fuselage join halfway up, but then you'd need to
point the Europa to fire ahead or behind
|
Fergus - apparently the directionality of a loop is not quite as
strong as one would assume. The "Morris Loop" has been around for a
while; see info at:
http://www.davemorris.com/dave/MorrisDFLoop.html
The author reckons that the theoretical null abeam may not be a real
disadvantage in practice. It's certainly another interesting
possibility for composite fuselages.
regards
Rowland
--
| Rowland Carson http://home.clara.net/rowil/
| <rowil(at)clara.net> ... that's Rowland with a 'w' ...
| | - The Matronics Europa-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?Europa-List |
|
|
|
| Back to top |
|
|
Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
|
| Posted: Tue Feb 24, 2009 11:06 am Post subject: Antennas for Europas |
|
|
Rowland,
Quite right - not as critical as a flashlight, but my full-wave quad
on 7 megs got 15db less off the sides, made it worthwhile to aim. I once
flew a piper J3 which was equipped with an antenna that made it almost
impossible to contact without aiming - made the tower elves furious, as I
had to swivel to talk on ground control.
Cheers, Ferg
PS: The owner was an antenna designer for Bombardier's daddy, Canadair, and
kept playing with things.
| | - The Matronics Europa-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?Europa-List |
|
| Description: |
|
Download |
| Filename: |
winmail.dat |
| Filesize: |
7.44 KB |
| Downloaded: |
219 Time(s) |
|
|
| 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
