Re: [Paparazzi-devel] Xbee 868 uplink

[Gautier Hattenberger]

Hi,
The bandwidth of a 868MHz modem is much smaller than the one of a 
2.4GHz. If you use the same telemetry file, the result can be an 
overloading of the downlink that will prevent the uplink to work very 
well. Removing some of the messages or at least increasing their sending 
period could solve your problem. I should be able to test this new modem 
next week I hope.

Gautier

Jeremy MICHEL a écrit :
> Hello,
>
> I am trying to use the new Xbee pro 868 MHz.
> Downlink works well however I couldn't get the Uplink working reliably.
> Sometimes I succeed in live changing aircraft's settings by multiple 
> fast double-clicks... Not user friendly...
>
> Datalink is configured in transparent mode which worked well with 
> Aerocomm modems.
>
> The code I used in "my_airframe".xml in order to configure the datalink:
> ...
> <section name="DATALINK" prefix="DATALINK_">
>    <define name="DEVICE_TYPE" value="PPRZ"/>
>    <define name="DEVICE_ADDRESS" value="...."/>
> </section>
> ...
> ...
> ap.CFLAGS += -DDOWNLINK -DUSE_UART0 -DDOWNLINK_TRANSPORT=PprzTransport 
> -DDOWNLINK_FBW_DEVICE=Uart0 -DDOWNLINK_AP_DEVICE=Uart0 
> -DPPRZ_UART=Uart0 -DDATALINK=PPRZ -DUART0_BAUD=B57600
> ap.srcs += downlink.c $(SRC_ARCH)/uart_hw.c datalink.c pprz_transport.c
> ...
>
> Any help is welcome,
>
> Jeremy
>
>
>
> _______________________________________________
> Paparazzi-devel mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/paparazzi-devel