At 08:05 AM 3/10/2005, AHMED, Yaseen wrote:
>Hi Folks!
>I have some queries on some terms pretty simple for you all:
>1. What is a "Cut off Frequency"?
Depends on the context, but usually refers to the frequency response of a
filter, specifically, where the response is 3dB down. Also used a lot in
waveguide, where there's a "waveguide cutoff frequency", below which energy
doesn't propagate down the waveguide.
>2. Can anyone explain Direct Sequence Spread Spectrum (DSSS) in detail?
A very good textbook on spread spectrum, not requiring extensive analytical
skills or math knowledge, is R.C.Dixon, "Spread Spectrum Systems",
published by Wiley. I think the latest version is 1994, which covers a lot
of commercial applications. Earlier versions were focussed more on
military systems.
>3. Can any one mail me or show me the link for a ebook on HAM Radio's,
>Please...?
A good place to start is http://www.arrl.org/
here's some online video presentations:
http://library.thinkquest.org/27887/gather/application/ham_radio.htm
Here's a power point presentation going over the questions on the test (but
it's not a good "intro to ham radio" )
http://people.smu.edu/arc/tech/tech.ppt
Googling for "Introduction ham radio" turns up a lot of links, some good,
some bad.
>4. Any one certified as a CWNA here?
>
>Thanks a Lot,
>AHMED
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