Re: Cheap wireless (RF) receiver/transmitter solution?

From: John Fields (jfields_at_austininstruments.com)
Date: 12/19/04 

Date: Sun, 19 Dec 2004 10:38:08 -0600

On 15 Dec 2004 01:02:53 GMT, Roger Johansson <no-email@home.se> wrote:

>"Phantoz" <phantoz@hotmail.com> wrote:
>
>> atm), as well as that the device allow the student to choose one of
>> four options, and work at an acceptable range (say, 20-25 meters). I
>> would like to translate the results real time to some comodity pc
>> hardware.
>
>Why do you need radio communication for distances of 25 m ?
>A network of computers and a simple program is a lot easier, and the
>students already have laptops, I presume. (The pupils get free laptops
>to use in the schoolwork when then begin school at 6 years age in my
>country, and all classrooms have networks built in already)
>
>The simple function you described can be realized with a simple directly
>wired circuit, if the students have no laptops. Hardware cost is
>something like 100 dollars.
>
>In short, forget the radio communication, it is extremely unnecessary for
>the purpose you describe. We are trying to minimize non-important radio
>communication, because there is too much pollution of the radio frequency
>ranges. 

---
I disagree.  Your opinion as to what's important or not is just that:
an opinion, and may or may not be accurate, depending on the
needs/wants of someone else.  In this instance it may well be that a
multitude of RF transceivers operating in a packet switching network
is the way to go, considering the costs involved with retrofitting an
existing structure with a hard-wired network, maintaining that
network, and upgrading or replacing it as time goes by.
As far as pollution from RFI goes, unless you've got evidence to the
contrary, I'm sure that devices capable of pumping out
micro/milliwatts into a specific band  and operating at duty cycles
of, say, a few minutes of RF out over an otherwise silent 24 hour
period aren't going to do much to raise the noise floor.   
-- 
John Fields
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