More importantly -- from a cochannel and receiver sensitivity perspective --
FH doesn't get the processing gain benefits of "spread" spectrum

-Charles

-------------------------------------------
CWLab
Technology Architects
http://www.cwlab.com 



-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Butch Evans
Sent: Wednesday, July 12, 2006 11:42 AM
To: [EMAIL PROTECTED]; WISPA General List
Subject: Re: [WISPA] 900 radio


On Wed, 12 Jul 2006, Blair Davis wrote:

>Hoppers don't play nice with Direct Sequence Spread Spectrum.  On
>the other hand, hoppers can get through more noise....

While this is almost accurate, it is not exacly right.  FHSS can 
cause serious problems for a DSSS system, as the hopper runs across 
the band.  HOWEVER, DSSS will trash about 30% of that spectrum for 
the hopper.  (At least that is the approximate ratio for the 2.4GHz 
range.)  Having said that, FHSS in 900 DOES make a lot of sense, so 
long as you have the ability to choose where it hops.

-- 
Butch Evans
Network Engineering and Security Consulting
573-276-2879
http://www.butchevans.com/
Mikrotik Certified Consultant
(http://www.mikrotik.com/consultants.html)
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