|Subject:||Re: [Paparazzi-devel] Xbee 868 uplink|
|Date:||Tue, 28 Apr 2009 16:32:57 +0100|
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
Gautier Hattenberger wrote:
> 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.
> Jeremy MICHEL a écrit :
>> 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="...."/>
>> ap.CFLAGS += -DDOWNLINK -DUSE_UART0
>> -DDOWNLINK_TRANSPORT=PprzTransport -DDOWNLINK_FBW_DEVICE=Uart0
>> -DDOWNLINK_AP_DEVICE=Uart0 -DPPRZ_UART=Uart0 -DDATALINK=PPRZ
>> ap.srcs += downlink.c $(SRC_ARCH)/uart_hw.c datalink.c pprz_transport.c
>> Any help is welcome,
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