Re: [Paparazzi-devel] Xbee 868 uplink

[Gareth Roberts]

I bought one, but the device is apparently designed for burst, not streaming. It only has a 10% duty cycle, so after about 5 min it just stops working for me. I switched back to 2.4ghzs until I work around it...

----- Original message -----

There is an example of such low-bandwidth telemetry file available in

telemetry/minimal.xml

--Pascal

Gautier Hattenberger wrote:

> 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

>>

>>

>>

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>

>

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