On Tue, Apr 10, 2012 at 10:07 AM, Chris Wozny <
address@hidden> wrote:
> After digging some more I found the sub band you were talking about.
> It's the 869.7-870.0 MHz G4 band. The only thing that worries me is
> that it can only transmit at 5 mW.
>
> - Chris
>
> On Tue, Apr 10, 2012 at 9:30 AM, Chris Wozny <
address@hidden> wrote:
>> Christophe,
>>
>> Do you know which sub bands can transmit 100% of the time? We really only
>> need a couple kilometers which is probably an overestimate. Also, are
>> modules that work on this band drop in replacements? The XBee 868LP can
>> handle 865-870 MHz which makes me think it should be able to get on this
>> less restrictive band via configuring the device.
>>
>> Best,
>> Chris
>>
>> On Apr 10, 2012, at 4:53 AM, Christophe De Wagter <
address@hidden>
>> wrote:
>>
>> The XBee 868 with their theoretical 40km range are not unusable. You just
>> need to consider the consequences of it being really a long range modem.
>>
>> There are some options to use them:
>>
>> 1) legal option: do not sent too much data, so others within the 40km radius
>> can also use the frequency.
>> 1a) transmit less than 0.4 seconds every 4 seconds.
>> 1b) fly less than 6 minutes when sending 100% of time
>> 1c) in between: e.g. fly less than 12 minutes when sending 50% of the
>> time.
>>
>> 2) illegal option: reset your modem every 5min with a xbee-reset module and
>> you can send 9600 kilobits non-stop both ways.
>>
>> Note 1: when the modem in your airplane stops sending because it sent too
>> much already, then it still works and can receive commands for instance. It
>> will just wait until the hour passes until sending again as the duty cycle
>> rule applies to full hours.
>> Note 2: also consider you can pick up data from others from quite far away.
>> So make sure you program your unique ID's and safety codes for instance.
>> Note 3: for shorter range there are also different sub-bands on 868 that can
>> send 100% of time.
>>
>> On Tuesday, April 10, 2012, Chris Wozny wrote:
>>>
>>> All,
>>>
>>> Due to EU regulations, we must use either 433 MHz, 868 MHz, 2.4 GHz
>>> for IMAV2012. I was wondering if there have been any developments with
>>> the 868 MHz band issues with Paparazzi or if it's still fairly
>>> unusable. Also, does anyone know of any 433 MHz transmitters tailored
>>> for AUTO2 outdoor flight? I'm curious as to why XBee doesn't make any
>>> 433 MHz modems...
>>>
>>> - Chris
>>> _______________________________________________
>>> Paparazzi-devel mailing list
>>>
address@hidden
>>>
https://lists.nongnu.org/mailman/listinfo/paparazzi-devel
>> --
>> -Christophe
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