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Re: [Paparazzi-devel] XBee 868 MHz Issues with Paparazzi

From: Chris Gough
Subject: Re: [Paparazzi-devel] XBee 868 MHz Issues with Paparazzi
Date: Tue, 10 Apr 2012 11:31:35 +1000

> 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...

don't know about XBee, but the open source firmware for SiLabs Si1000
SoC radios has improved a lot recently.

HopeRF makes a 433 MHz Si1000-based module, there are probably others too.

We've been getting good results with prototypes of the 900MHz HopeRF
module (8km range @ legal EIRP limit, using 1/4 wave dipole and
external amplifier). I'll be testing some 433 MHs ones in few weeks
and hope/expect that even without an amplifier or directional antennas
they will be a cheap, practical, long range link (low bandwidth) link.

For paparazzi, with this firmware, don't forget to set MAVLINK=0
(ATS6=0; AT&W), so it's just a transparent serial link, otherwise it
will try to insert radio-status MavLink messages and pack data into
MavLink-specific frames.

Chris Gough

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