A aviation & planes forum. AviationBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AviationBanter forum » rec.aviation newsgroups » Soaring
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Flat external FLARM antenna?



 
 
Thread Tools Display Modes
  #21  
Old May 11th 18, 01:04 AM posted to rec.aviation.soaring
[email protected]
external usenet poster
 
Posts: 59
Default Flat external FLARM antenna?

Two options come to mind.
1) Put the A antenna as high as reasonable around the glare shield. Away from other conductors that might mess with the pattern. I run with a piece of 1/16 lexan to put the antenna vertically above the glare shield. Use the Flarm web site tool to see what coverage you have. If there is a coverage hole behind and below, you could put a B antenna out the bottom. If it doesn't transmitt, it won't help others see you, but it should help you see others.

2) It seems like something in the tail leading edge should work well if you could figure out how to put the Flarm brick back there so the antenna cable was not excessive. This seems more trouble that it's worth unless the around the glare shield radiating out the canopy plan doesn't work.
Ads
  #22  
Old May 11th 18, 01:13 AM posted to rec.aviation.soaring
kinsell
external usenet poster
 
Posts: 112
Default Flat external FLARM antenna?

On 05/10/2018 05:54 PM, Matt Herron Jr. wrote:
On Thursday, May 10, 2018 at 4:22:43 PM UTC-7, kinsell wrote:
So are you talking about Flarm or PowerFlarm?? They are different you know.


On 05/10/2018 08:07 AM, Matt Herron Jr. wrote:
Flarm antennas are a real pain for ships with carbon hulls. Coverage is always poor, especially below. Is there a way to make a perfectly flat and thin antenna that could be taped to the outside of the hull and fed through a small (1/8"?) hole? I am thinking 2 thin wire strands, or foil strips, fed through from the inside, then taped in place with wing tape. I would put one on either side of the nose for good coverage. The wires could even be longer (some wavelength ratio) for better gain. The tiny hole could easily be filled later if the install was reversed.

Any RF engineers out there care to take a shot at this?


power flarm


Ah, that's what I guessed. But I shouldn't have to guess. If you mean
Flarm, say "Flarm", and if you mean PowerFlarm, say "PowerFlarm". If
you say "Classic Flarm", hopefully people will explain to you there's no
such thing.

See the recent thread with people who are shocked that Flarm isn't
approved for use in the US or Canada.
  #23  
Old May 11th 18, 09:10 PM posted to rec.aviation.soaring
Chris Wedgwood[_2_]
external usenet poster
 
Posts: 36
Default Flat external FLARM antenna?

On Thursday, May 10, 2018 at 3:07:15 PM UTC+1, Matt Herron Jr. wrote:
Flarm antennas are a real pain for ships with carbon hulls. Coverage is always poor, especially below. Is there a way to make a perfectly flat and thin antenna that could be taped to the outside of the hull and fed through a small (1/8"?) hole? I am thinking 2 thin wire strands, or foil strips, fed through from the inside, then taped in place with wing tape. I would put one on either side of the nose for good coverage. The wires could even be longer (some wavelength ratio) for better gain. The tiny hole could easily be filled later if the install was reversed.

Any RF engineers out there care to take a shot at this?




It is possible to make a flat antenna with the same radiation pattern as a 1/4 wave dipole.

But, it needs exotic ( read expensive) rf material, and would not be flexible, so hard to fit on the outside of the fuselage. thickness would be about 6-7mm, and would be unaffected by carbon fibre underneath it

It would also be 200-300€
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Q: Position of external Flarm RF antenna on tow plane Aviat Husky A1 RuudH Soaring 5 December 20th 12 04:58 PM
homemade external/internal antenna for handheld. gorgon Home Built 11 March 20th 08 09:38 PM
How to hook handheld up to external antenna? Roy Smith Owning 6 January 26th 04 04:05 PM
External GPS Antenna Jim Weir Owning 0 November 29th 03 04:12 AM
External GPS Antenna Jim Weir Aviation Marketplace 0 November 29th 03 04:10 AM


All times are GMT +1. The time now is 10:00 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 2004-2018 AviationBanter.
The comments are property of their posters.