this is really nothing new, it's a simple dipole antenna and these we have had for a number of years already for less $ than even this one
see http://wingsandwheels.com/antenna_vh...s_mobile_e.htm L2 Transponder antenna
$99.00
Antennas, even the conventional transponder antennas can be used internally in FIBERGLASS gliders and aircraft but not in those made of metal or carbon fiber just the same as these dipole types.....Dipole antennas simply have to be matched like any antenna to the frequency by length and the dipole antenna is essentially twice as long as a 1/4 wave antenna since one lead is essentially the ground plane ...... these antennas also should be mounted vertically, not just lying down like the picture shows and should not be next to other antennas, cables or metals posts or structures.....then they will work pretty much "as good" as conventional antenna types.
tim
Please visit the Wings & Wheels website at www.wingsandwheels.com

"Lars Peder Hansen" wrote in message k...
Hello all,

I see a new type of transponder antennas on the market, for example the
Filser DP1090-5:
http://glider-equipment.nl/catalog/p...a-dp10905-p-63
These seem almost too good to be true; Low cost & complexity, easy
installation inside (non-carbon) fuselages..
Does anyone have experience with these antennas. Performance? Compatibility
with transponder models commonly used in gliders? Examples of EASA approved
installations?

Thanks,
Lars Peder (who finds that more and more of the airspace around him becomes
class C :-( )



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