It will be difficult to find a system that is both cheap and has a high
jamming margin.  I don't the details on why you need a high jamming
margin,  but there are a bunch of vendors selling cheap spread-spectrum
LAN cards;  you could always just buy a few and see if they work in your
application.

There are more expensive radios made for the transit (i.e., railroads,
 metros) market that are more jam-resistant,  but also much more
expensive.

Hope this helps.

Brian Robinson
hbrobinson@lucent.com

 ----------
From:  PICLIST [SMTP:PICLIST@MITVMA.MIT.EDU]
Sent:  Wednesday, July 01, 1998 9:57 AM
To:  PICLIST
Subject:  Spread Spectrum radios

There has been a few threads on these type of radios and I wanted to let
the
list know that in a few weeks there will be some relatively cheap systems
available which will have very high jamming margins. This will be both
frequency hopping and also direct sequence.

If of interest please let me know.

Thanks,

Peter Grey
Neosystems
Australia