[sdiy] presets on a modular

[Richard Wentk]

At 22:54 11/11/2004 -0500, Glen wrote:
>At 03:34 PM 11/11/04 , Richard Wentk wrote:
>
> >>...or perhaps implement a wireless digital network
> >
> >Big issues with guaranteed bandwidth and delivery time there. And issues
> >with FCA and other certification if you try to roll your own protocol.
> >
> >If there's an off-the-shelf solution for wireless that's synchronous rather
> >than packet based, I'd like to know about it because it's exactly what I
> >need for my ever expanding laser controller.
>
>Wireless doesn't always have to mean radio transmission. Could you perhaps
>use a modulated IR link for your laser?

Too slow. You're lucky to get more than 1MHz out of a laser.

>There are also several frequency bands scattered throughout the spectrum
>that are reserved for low-power non-licensed applications.

The problem is these differ between different countries. And the open ones, 
like the remote control bands, are susceptible to interference. (Possibly 
adding a unique performance element as your synth responds to a model 
aircraft flying around it. But I digress.)

Commercially I think you'd need certification to be legal. You could 
operate illegally of course, but not if you plan to sell your hardware to 
anyone.

You're also stuck with the complexity of creating secure and reliable 
channel codings, and trying to work out how much bandwidth you need. A 
wireless replacement for a 50MHz digital bus is going to need a *lot* of 
radio bandwidth. And designing an RF system that works at - say - 2GHz - is 
a huge effort.

I much prefer the optical mini-LAN idea.

Richard