Re: [Paparazzi-devel] Aerocomm AC4868-250M Issues

[Christoph Niemann]

Thank very much for your rapid reply Cristophe!

I tried the Iridium file before. I now also tried the xbee file.I
moved the ground modem two rooms away into the kitchen into the oven
(switched off :-) ), trying to use it as faraday cage. The currently
the modems are configured to 70mW like in the attached files. But the
Problem currently is, it starts to send some packages and then quits
operation. Do the screenshots look fine? Perhaps the modems draw to
much current and I don't recognize it? I don't know :-(

Christoph

2012/2/19, Christophe De Wagter <address@hidden>:
> At full power you MUST put the modems far apart... like at least the room
> nextdoors. At Full power the 868MHz signal is so extremely powerful that
> the RF-fronted of the receiver is completely saturated. Sometimes removing
> antenna's can help.
>
> The package size of aerocomm is also quite large, meaning that the small
> paparazzi packages that are not sent simultaneously (gap between bytes) are
> sent with very low efficiency, sometimes as low as 20%. There is a
> telemetry that groups packages in bigger packets.
>
> https://github.com/paparazzi/paparazzi/blob/master/conf/telemetry/iridium.xml
>
> To comply with regulations you should send at most 200 bytes per second as
> found from xbee868 tests.
>
> https://github.com/paparazzi/paparazzi/blob/master/conf/telemetry/xbee868.xml
> should
> do this trick.
>
> -Christophe
>
>
>
> On Sun, Feb 19, 2012 at 3:13 PM, Christoph Niemann <address@hidden
>> wrote:
>
>> Hi everybody,
>>
>> I'm currently trying to configure some AC4868-250M radiomodems. I saw
>> there where some regulatory Issues
>> (http://paparazzi.enac.fr/wiki/868MHz_Issues) and the implemetation of
>> the aercomms cause them to drop data. What I want to do is to operate
>> them at full power and 9600Baud. If I set them to 3 or 25mW it works.
>> At 70 or even 250mW the range tests in the Windows Tool fail and the
>> Paparazzi Telemetry doesn't work either. Some packages do their way,
>> but it is not really possible to operate the AC this way.
>> I know there are some users on this list, who use those Modems.
>> Perhaps somebody could make a screenshot or supply his configuration
>> files.
>> If they worked it would be really cool since those Modems don't seem
>> to interfere neither with my JETI 2.4Ghz radio nor my Foxtech 5.8Ghz
>> video tx, so every help appreaciated :-)
>>
>> Cheers
>>
>> Christoph
>>
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>