Re: garage remote jamming

[nobody@xxxxxxxxxxxx (Dave Houston)]

"Jeff Volp" <JeffVolp@xxxxxxx> wrote:

>"Robert Green" <ROBERT_GREEN1963@xxxxxxxxx> wrote in message
>news:9N2dncCwPcN4VHrYnZ2dnUVZ_vTinZ2d@xxxxxxxxxx
>
>>  Right now, my admittedly limited
>> understanding of radio transmissions tells me that a stronger transmitter
>> will completely drown out a weaker one on the same frequency.
>
>There is a technique that uses spread-spectrum and correlation between a
>received signal and a pseudo-random pattern.  It is possible to recover a
>weak signal even in the presence of jamming with this method.  Bandwidth is
>limited, and it takes time to search until a pattern match is found.  But it
>amazing how that signal pops out of the noise when correlation is achieved.
>GPS receivers use this technique to recover the weak satellite signals.

But, by definition "spread-spectrum" is not "on the same frequency".


http://davehouston.net
http://tech.groups.yahoo.com/group/roZetta/
roZetta-subscribe@xxxxxxxxxxxxxxx