Re: [Paparazzi-devel] Long Range Flying Wing

[Eduardo lavratti]

Well, i am using xbee 900mhz and configured the ppz to work on 9600kbps.
with this config i receive all telemetry data but is very dificult to send command to airplane.
Some time i need to clic more than 10 time airplane accept the command.

even change waypoint position is very difficult.

> Date: Fri, 6 Jul 2012 20:09:52 +0300
> From: address@hidden
> To: address@hidden
> Subject: Re: [Paparazzi-devel] Long Range Flying Wing
>
> Well i have flown to a point where the ground station with its 8db patch
> could not receive well
> the planes data but i was still able to give a command to the plane and
> return it home which indicates
> good airborne reception.
> I use as stated the polling mode with no confirmation and retries are
> set to 0.
> I have set the addresses somewhere in the top range, FFF0-FFF1 i think
> and changed the channel
> to 9 (different hopping frequencies).
> One day i had a problem communicating with the plane (the downlink was
> fine)
> and it proved to be the video tx.
> Since then i have fitted filters to the video tx (high pass) and the
> modem (low pass)
> and all problems were solved.
> The antenna and the modem have to be in a straight line otherwise SWR
> will rise,
> RF will flow through the wires all over the airplane causing havoc and
> the antenna
> radiation pattern will be greatly distorted.
> The same goes for the video tx.
> Chris
>
> Hi Stephen
>
> We configured our 9XTends according to your recommendation
> (Acknowledged Polling Mode):
>
> http://paparazzi.enac.fr/wiki/Modems#Configuration
>
> As we are sending lots of telemetry and not using datalink joystick
> control we chose the air module as the base. It gets pretty warm in
> operation. In the workshop everything works fine.
>
> On the field we experience a very asymmetrical link: The telemetry
> data from the aircraft gets well to the ground station, also at range.
> But the commands from the ground station only get to the aircraft at
> very close range. At range we don't get any commands from the ground
> station to the aircraft anymore.
>
> Can you explain this behaviour? How do you achieve a symmetrical data link?
>
> We still have a 90 degree bend between the modem body and the antenna
> on the airplane. On the ground station we have them in a straight
> line. Could this explain the asymmetrical link?
>
> Regards, Reto
>
> 2
>
>
>
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