Re: [Paparazzi-devel] circular polarized antenna hype

[Reto Büttner]

Hi Tilman

I get over 15km perfect reception using 2.4 GHz XBee and a 14 dBi
linear polarized patch antenna on the ground station and a standard
whip antenna on the aircraft. Do you need any more?

At long range flight the antennas are parallel (in phase), as the
aircraft will be flying horizontally. You most probably will not be
performing aerobatics at long range. At short range, where you might
want to try some tighter turns, reception is no problem anyway.

Antenna tracking was no issue for me so far. At long range it is no
problem to manually track the antenna as things go very slowly. At
short range you don't need antenna tracking.

Happy landings,
Reto

2012/7/23 Tilman Baumann <address@hidden>:
> On 23/07/12 14:47, Marc Schwarzbach wrote:
>>
>> Hi Tilman,
>>
>> the basic principle of loss of signal strength when two linear antennas
>> are out of phase applys to XBee, too, of course. So you could avoid that by
>> spending a constant loss of 3dB when using a circular polarized antenna on
>> one side.
>>
>> In my oppinion it makes sense when using a higher gain circular on the
>> ground (patch or helix) and a standard omni on the plane.
>> I´m a little sceptical with all the hype around cloverleaves and so on...
>> Also look fragile when used on the plane :-)
>
>
> True. Eventually I would like to invest in a antenna tracker at the ground
> station.
>
>>
>> I have no problems with 2.4GHz Xbees with standard wire antennas up to
>> 1km.
>>
>> Do you have problems with your connection?
>
>
> Not really. But since I fly 2.4Ghz the range is not terribly long and I
> wonder if I might get better reception at the fringes of the range.
>
> Anyway. I just wonder if the wondrous advantages the FPV guys keep harping
> around would apply to us. :)
>
>
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