I'll go with the whip antenna version of the XBee. For my application 1km is suficcient. I will try and arrange the equipment so that the GPS is as far from the Rx (and modem) as possible.
I plan to modify the R617FS to collect the 5 channel sum signal from it.
Helge.
2010/12/30 Martin Mueller
<address@hidden>
Hi Helge,
I am a bit confused about the modem options. The XBee Pro has several
antenna alternatives, including a patch antenna which seems very
practical. I wonder however if the range of the patch antenna would be
the same as it would be with a whip antenna. The manufacturer claims the
same range for all.
Does anyone have any experience on this?
In our tests the patch antenna was pretty bad compared to the whip one.
Also I have not used 2.4GHz for both RC and telemetry before. Can I
expect this to work safely? The two radios use two different systems,
FASST (Futaba) and DSSS (XBee).
Some of the FASST receivers affect GPS if too close but they work fairly well with the XBee. We increased the XBee telemetry throughput to the max and still had > 1km range with the FASST.
There are special FASST receiver versions from mikrokopter that turn off the PPM if no HF signal is received.
Martin
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