Re: [Paparazzi-devel] Long Range Flying Wing

[Reto Büttner]

Hi Chris

We have problems over 25 km with 9600 baud. Something must be wrong in
our setup. We use a dipol antenna on the plane as well, very similar
to yours.

Thanks for the tip to keep the modem body and the antenna in a
straight line. In our current configuration we have a 90 degree bend.
We will check on mounting it in a straight line.

Cheers, Reto

2012/5/1 Chris <address@hidden>:
> I get over 25km with 115200 (haven't tried further) and a 8dbi panel antenna
> without any problems.
> At 9600 i have gone as much as 40km out and the signal was rock solid both
> ways so i bet it could
> probably go further than that.
> One thing to watch for is the airborne antenna, don't use the normal 900Mhz
> l/4 whip antenna,
> use a dipole antenna (l/2) or a J pole.
> If you use an antenna that can be rotated (swivel) keep the modem body and
> the antenna
> in a straight line, it makes a big difference.
> I use this antenna
> http://www.dpcav.com/xcart/900MHz-Antenna-Compact-Dipole.html
> You may also try a V dipole but not made from pcb (pcb antennas have a lot
> of losses).
> I haven't tried 9600bps and joystick control though only at 115200.
> As i said i had up link problems at normal mode but when i switched to the
> polling mode
> all problems went away, instant response to GCS and joystick commands with
> no visible latency.
> Nice plane you got i am sure that it must have almost no drag as it looks
> really slick.
>
> Chris
>
>
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