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

[Christoph Niemann]

Thank you very much Balasz!
I'll try it this evening and report.

Cheers 

Christoph
-------- Original-Nachricht --------
> Datum: Mon, 20 Feb 2012 16:04:39 +0100
> Von: Balazs GATI <address@hidden>
> An: address@hidden
> Betreff: Re: [Paparazzi-devel] Aerocomm AC4868-250M Issues

> Dear Christoph,
> 
> my AC4868 is quite old. I purchased it directly from Aerocomm. I 
> attached the config file and the screen capture for my AC4868 connected 
> to the GCS. (The onboard modem is hard to access.)
> 
> Balazs
> 
> 2012.02.19. 20:12 keltezéssel, Christoph Niemann írta:
> > Dear Balazs,
> >
> > what I tried to do is to supply the modems by regulated DC-supplies with
> > current monitoring and the modems in two different rooms, like described
> > before. I currently only tried it with the Windows SW from Laird. I
> > observe that it works for a moment and then quits operation. Before it
> > completely quits working data-errors occur. The Modems draw about 120mA
> > on startup and about 60mA afterwards. I currently suspect the config to
> > be wrong (somehow). Perhaps you could supply your config to me, so I can
> > check if mine is the same?
> > Thank you very much for your help!
> >
> > Christoph
> >
> > ---------- Forwarded message ----------
> > From: ** <address@hidden <mailto:address@hidden>>
> > Date: 2012/2/19
> > Subject: Re: [Paparazzi-devel] Aerocomm AC4868-250M Issues
> > To: address@hidden <mailto:address@hidden>
> >
> >
> > Dear Christoph,
> >
> > I am using AC4868-250M for two years at full power but I never
> experienced
> > the problem you describe. 2m distance between the two antennas seems
> > enough by me. How do you power the onboard module? I am using a linear
> > voltage regulator to provide 3.3V from the 5V bus of the paparazzi. (The
> > 3.3V bus isn't enough powerful for such a long range modem)
> >
> >
> > Balazs
> >
> >  > 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
> > <mailto: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 <mailto: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
> >  >>>
> >  >>> _______________________________________________
> >  >>> Paparazzi-devel mailing list
> >  >>> address@hidden <mailto:address@hidden>
> >  >>> https://lists.nongnu.org/mailman/listinfo/paparazzi-devel
> >  >>>
> >  >>>
> >  >>
> >  >
> >  > _______________________________________________
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> >  > address@hidden <mailto:address@hidden>
> >  > https://lists.nongnu.org/mailman/listinfo/paparazzi-devel
> >  >
> >
> >
> >
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> >
> >
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> 
> -- 
> Balazs GATI, PhD
>       Department of Aircraft and Ships
>       Budapest University of Technology and Economics
> 
> Address:   Budapest
>            Stoczek u 6. J. ép. 423
>            1111
> Tel:       +(36)-1-463-1960
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> Homepage: http://rht.bme.hu/~gatib/