snipper_cr
join:2002-01-22
Wheaton, IL
clubs:
| Twoway?
I dont know much of this sorta thing so this question is going to sound very very VERY stupid.
First, the 700MHz spectrum is what was originally used by TV broadcasters (well i guess, still are until feb 09). Isnt that an analog spectrum (n00b question 1)
Also, since it was used for TV broadcasts, does it allow for two way communication or broadcast only? |
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RadioDoc
Sortofadog
Premium,ExMod 2000-03
join:2000-05-11
Chicago, IL
 ·AT&T Midwest
| "Spectrum" knows no protocol. All RF signals transmitted through the air are analog by definition. So are all cable RF signals in coax for that matter. Television was using it for television. Your cell phone probably uses some of what was originally channels 70-83, which was reassigned to AMPS back in the early 80's. 800 MHz trunking systems for two way radio work in that ex-TV band too. That is definitely 2-way.
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Toolmaster of La Grange. |
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asdfdfdfdfdf
@Level3.net
| reply to snipper_cr
Those issues are a function of the equipment that we design to utilize the spectrum and the political choices and rules we decide on. We design and use this equipment to transmit humanly comprehensible information by agreeing on encoding rules and making political choices about who can use certain frequencies and how and for what purpose they can use them.
These things are not intrinsic properties of the spectrum itself.
There is nothing about the underlying physical properties of wave propagation that requires that we use this spectrum to build receivers that decode transmitted waves as visual images put onto screens. Nothing about it requires that information only be transmitted one way by a small group of people who create and control the content transmitted. These are all human political choices. We can choose to create different receivers which interpret and decode transmitted waves not as visual images but as data of some other kind. |
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