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) -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
