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

[Christophe De Wagter]

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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