Powerflarm results @Seniors

On Sun, 25 Mar 2012 09:50:24 -0700, cfinn wrote:

I know this is dangerous, but I've been thinking. What about using the
TE probe for mounting? The tail style TE probe extends 12 to 18 inches
from the crabon fiber tail. It could be secured a few inches behind the
probe pressure openings, so it wouldn't interfer with air flow over the
sensors. Of course you would need to install a connector, so it could be
removed.

Dolba & Dolba make and sell a variety of FLARM antennae for Europe: foil
stick-ons, flat plate and rod antennae. It might be worthwhile asking if
they can supply them for the PF using the US frequency. I was put onto
them by Glasfaser when I was looking for FLARM antennae for my Libelle.

Here's a URL: http://www.dolba.de/index.html



--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

At 17:51 25 March 2012, Martin Gregorie wrote:
On Sun, 25 Mar 2012 09:50:24 -0700, cfinn wrote:

I know this is dangerous, but I've been thinking. What about
using the
TE probe for mounting? The tail style TE probe extends 12 to
18 inches
from the crabon fiber tail. It could be secured a few inches
behind the
probe pressure openings, so it wouldn't interfer with air flow
over the
sensors. Of course you would need to install a connector, so
it could be
removed.

Dolba & Dolba make and sell a variety of FLARM antennae for
Europe: foil
stick-ons, flat plate and rod antennae. It might be worthwhile
asking if
they can supply them for the PF using the US frequency. I was
put onto
them by Glasfaser when I was looking for FLARM antennae for
my Libelle.

Here's a URL: http://www.dolba.de/index.html



--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |


Martin,
I am afraid, that antenna is not the problem, it's the positioning
of it. You can install yagi -type antenna, that has high gain in
one direction, but then you are not visible in other directions.
Also, if antenna has high gain, it typically has low overall efficiency.
Same stands for receiving.
Dipole if efficient and near optimal antenna in this application,
IMHO.
-kh

On Sun, 25 Mar 2012 20:06:45 +0000, Kimmo Hytoenen wrote:

I am afraid, that antenna is not the problem, it's the positioning of
it.

I'm not arguing with that: I know that problem first hand from fitting a
RedBox in my Libelle. The solution I chose, following discussions with a
Danish Libelle pilot, was to fit a dipole half-way between the front of
the instrument tray and the rudder pedals. This works well, though its
exact position id fairly critical: see

http://www.gregorie.org/gliding/libe...ole_mount.html


You can install yagi -type antenna, that has high gain in one
direction, but then you are not visible in other directions.

Yes, I wondered about that, but they always seem to recommend using the
Yagi in conjunction with a splitter and an omnidirectional antenna.

Same stands for receiving.

Quite.

Dipole if efficient and near optimal antenna in this application,
IMHO.

....but difficult to install on a carbon airframe without adding drag. I
just wanted to highlight a source of a variety of antennae that can be
mounted remotely from the PF.

Disclaimer: I am not connected in any way with Dolba.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |