[MLB-WIRELESS] Q for radio geeks

[Tony Langdon]

> >How far are you talking?
> >
> >Once you go beyond LOS, you need to do one or more of the following:
> >
> >1.  Increase power (if you can get enough tropo scattering)
> >2.  Use multiple hops (just like the WLAN is attempting to do)
> >3.  Have an elevated access point/central node (variation on #2)
> 
> is there any value in using dumb repeaters ie they just pick up and
> re-broadcast the RF, like the CB repeaters they use in the outback.

Well, it would be tricky, as a traditional repeater uses a split pair of
frequencies, but WLAN cards don't.  And you need to build demodulators and
modulators...  However, there is one class of device that _would_ help, and
is simpler to build.  it's called an OCAR (On Channel Active Repeater).
Basically, it's 2 antennas with sufficient separation, and lots of
amplifiers between them.  The antennas and amps have to be positioned so the
whole thing doesn't oscillate, but they apparently work very well, once
setup.

Only hitch.  You got bugger all chance of getting such a beast type
approved, so you'd have to pirate if you went this approach (ham systems
operating between 2400 and 2450 MHz are the obvious exception here).

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