🚀 go-pugleaf

In article <1993Jan12.155103.16454@cis.ohio-state.edu>, bonk@elm.cis.ohio-state.edu (gregory j bonk) writes:
|> I was sent this from a broadcast to AT&T employees.
|>  Thought you might be interested.....
|>    
|>          *** AT&T today announced a high-power, all-digital cordless phone 
      . . .
|>          AT&T's spread-spectrum, frequency-hopping architecture, which is 
|>          patent-pending, actually avoids interference by "hopping" the 
|>          radio signal among 50 of the available 173 channels during a 
|>          conversation.  

I've heard about frequency hopping and spread spectrum stuff for over a
decade now.  It sounds like a great idea, but I have never bothered,
for some reason, to ask two basic questions:

1)  How does it increase range without increasing effective radiated
power?  If it's simply a matter of raising the effective
signal-to-noise ratio, how does it accomplish that?

2)  How do the transmitter and receiver agree on the hopping sequence,
and how do they synchronize?

If this is too far off-topic (and I suspect that it is), accept my
apologies and email explanations (or references, if you think I should
be doing my own research) directly to me.  
-- 

...Russ Schnapp
BIX: rschnapp           Email: netcom!metaflow!rschnapp or rschnapp@metaflow.com
Metaflow Technologies   Voice: 619/452-6608x230;  FAX: 619/452-0401
La Jolla, California    Unless otw specified, I`m speaking only for myself!