Jonathan Johnson wrote:
>
> Has anyone here used those FHSS modules from Aerocomm? and if so,
>
> how did you find them? what range did you get etc,
>
> and is it used in a built up area?
>
> Does anyone know of any other OEM Spread spectrum modules?

FHSS is usually pretty trivial to add to modules that use DDS
synthesizers, or have fast PLL VCOs. You're just channel hopping
after all, so your own firmware can do it. You just have to make
certain that your master and slave both agree on the channel order,
and have a means to 'sync up' should they loose lock step.

DSSS (Direct Sequence) is more desirable, IMO, because of the
intrinsic gain and noise immunity to be had, and the ability to
share the same spectrum space with minimal collision/interference.
CDMA cell phones are a good proof of the strength of DSSS.

I'm still looking for some DSSS RF modules for the ISM bands 433/915,
and possibly 2.4Ghz.

This slash dot article makes some comments about what happens when you
have a few hundred roboteers in an arena trying to make 802.11 work (NOT!).
http://ask.slashdot.org/askslashdot/03/09/26/203259.shtml?tid=137&tid=193
http://ask.slashdot.org/comments.pl?sid=80148&cid=7069763

Robert

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